| Message ID | 20210517145314.157626-3-jingzhangos@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | KVM statistics data fd-based binary interface | expand |
On Mon, May 17, 2021 at 9:32 AM Jing Zhang <jingzhangos@google.com> wrote: > > Provides a file descriptor per VM to read VM stats info/data. > Provides a file descriptor per vCPU to read vCPU stats info/data. > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > --- > arch/arm64/kvm/guest.c | 26 +++++ > arch/mips/kvm/mips.c | 52 +++++++++ > arch/powerpc/kvm/book3s.c | 52 +++++++++ > arch/powerpc/kvm/booke.c | 45 ++++++++ > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > arch/x86/kvm/x86.c | 53 +++++++++ > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > include/uapi/linux/kvm.h | 50 +++++++++ > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > 9 files changed, 745 insertions(+) > > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c > index 0e41331b0911..1cc1d83630ac 100644 > --- a/arch/arm64/kvm/guest.c > +++ b/arch/arm64/kvm/guest.c > @@ -28,6 +28,32 @@ > > #include "trace.h" > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); > + > +struct _kvm_stats_header kvm_vm_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vm_stats_desc), > +}; > + > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > + STATS_DESC_COUNTER("hvc_exit_stat"), > + STATS_DESC_COUNTER("wfe_exit_stat"), > + STATS_DESC_COUNTER("wfi_exit_stat"), > + STATS_DESC_COUNTER("mmio_exit_user"), > + STATS_DESC_COUNTER("mmio_exit_kernel"), > + STATS_DESC_COUNTER("exits")); > + > +struct _kvm_stats_header kvm_vcpu_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vcpu_stats_desc), > +}; > + > struct kvm_stats_debugfs_item debugfs_entries[] = { > VCPU_STAT_COM("halt_successful_poll", halt_successful_poll), > VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c > index f4fc60c05e9c..f17a65743ccd 100644 > --- a/arch/mips/kvm/mips.c > +++ b/arch/mips/kvm/mips.c > @@ -38,6 +38,58 @@ > #define VECTORSPACING 0x100 /* for EI/VI mode */ > #endif > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); > + > +struct _kvm_stats_header kvm_vm_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vm_stats_desc), > +}; > + > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > + STATS_DESC_COUNTER("wait_exits"), > + STATS_DESC_COUNTER("cache_exits"), > + STATS_DESC_COUNTER("signal_exits"), > + STATS_DESC_COUNTER("int_exits"), > + STATS_DESC_COUNTER("cop_unusable_exits"), > + STATS_DESC_COUNTER("tlbmod_exits"), > + STATS_DESC_COUNTER("tlbmiss_ld_exits"), > + STATS_DESC_COUNTER("tlbmiss_st_exits"), > + STATS_DESC_COUNTER("addrerr_st_exits"), > + STATS_DESC_COUNTER("addrerr_ld_exits"), > + STATS_DESC_COUNTER("syscall_exits"), > + STATS_DESC_COUNTER("resvd_inst_exits"), > + STATS_DESC_COUNTER("break_inst_exits"), > + STATS_DESC_COUNTER("trap_inst_exits"), > + STATS_DESC_COUNTER("msa_fpe_exits"), > + STATS_DESC_COUNTER("fpe_exits"), > + STATS_DESC_COUNTER("msa_disabled_exits"), > + STATS_DESC_COUNTER("flush_dcache_exits"), > +#ifdef CONFIG_KVM_MIPS_VZ > + STATS_DESC_COUNTER("vz_gpsi_exits"), > + STATS_DESC_COUNTER("vz_gsfc_exits"), > + STATS_DESC_COUNTER("vz_hc_exits"), > + STATS_DESC_COUNTER("vz_grr_exits"), > + STATS_DESC_COUNTER("vz_gva_exits"), > + STATS_DESC_COUNTER("vz_ghfc_exits"), > + STATS_DESC_COUNTER("vz_gpa_exits"), > + STATS_DESC_COUNTER("vz_resvd_exits"), > +#ifdef CONFIG_CPU_LOONGSON64 > + STATS_DESC_COUNTER("vz_cpucfg_exits"), > +#endif > +#endif > + ); > + > +struct _kvm_stats_header kvm_vcpu_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vcpu_stats_desc), > +}; > + > struct kvm_stats_debugfs_item debugfs_entries[] = { > VCPU_STAT("wait", wait_exits), > VCPU_STAT("cache", cache_exits), > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c > index bd3a10e1fdaf..5e8ee0d39ef9 100644 > --- a/arch/powerpc/kvm/book3s.c > +++ b/arch/powerpc/kvm/book3s.c > @@ -38,6 +38,58 @@ > > /* #define EXIT_DEBUG */ > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > + STATS_DESC_ICOUNTER("num_2M_pages"), > + STATS_DESC_ICOUNTER("num_1G_pages")); > + > +struct _kvm_stats_header kvm_vm_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vm_stats_desc), > +}; > + > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > + STATS_DESC_COUNTER("sum_exits"), > + STATS_DESC_COUNTER("mmio_exits"), > + STATS_DESC_COUNTER("signal_exits"), > + STATS_DESC_COUNTER("light_exits"), > + STATS_DESC_COUNTER("itlb_real_miss_exits"), > + STATS_DESC_COUNTER("itlb_virt_miss_exits"), > + STATS_DESC_COUNTER("dtlb_real_miss_exits"), > + STATS_DESC_COUNTER("dtlb_virt_miss_exits"), > + STATS_DESC_COUNTER("syscall_exits"), > + STATS_DESC_COUNTER("isi_exits"), > + STATS_DESC_COUNTER("dsi_exits"), > + STATS_DESC_COUNTER("emulated_inst_exits"), > + STATS_DESC_COUNTER("dec_exits"), > + STATS_DESC_COUNTER("ext_intr_exits"), > + STATS_DESC_TIME_NSEC("halt_wait_ns"), > + STATS_DESC_COUNTER("halt_successful_wait"), > + STATS_DESC_COUNTER("dbell_exits"), > + STATS_DESC_COUNTER("gdbell_exits"), > + STATS_DESC_COUNTER("ld"), > + STATS_DESC_COUNTER("st"), > + STATS_DESC_COUNTER("pf_storage"), > + STATS_DESC_COUNTER("pf_instruc"), > + STATS_DESC_COUNTER("sp_storage"), > + STATS_DESC_COUNTER("sp_instruc"), > + STATS_DESC_COUNTER("queue_intr"), > + STATS_DESC_COUNTER("ld_slow"), > + STATS_DESC_COUNTER("st_slow"), > + STATS_DESC_COUNTER("pthru_all"), > + STATS_DESC_COUNTER("pthru_host"), > + STATS_DESC_COUNTER("pthru_bad_aff")); > + > +struct _kvm_stats_header kvm_vcpu_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vcpu_stats_desc), > +}; > + > struct kvm_stats_debugfs_item debugfs_entries[] = { > VCPU_STAT("exits", sum_exits), > VCPU_STAT("mmio", mmio_exits), > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c > index 07fdd7a1254a..86d221e9193e 100644 > --- a/arch/powerpc/kvm/booke.c > +++ b/arch/powerpc/kvm/booke.c > @@ -36,6 +36,51 @@ > > unsigned long kvmppc_booke_handlers; > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > + STATS_DESC_ICOUNTER("num_2M_pages"), > + STATS_DESC_ICOUNTER("num_1G_pages")); > + > +struct _kvm_stats_header kvm_vm_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vm_stats_desc), > +}; > + > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > + STATS_DESC_COUNTER("sum_exits"), > + STATS_DESC_COUNTER("mmio_exits"), > + STATS_DESC_COUNTER("signal_exits"), > + STATS_DESC_COUNTER("light_exits"), > + STATS_DESC_COUNTER("itlb_real_miss_exits"), > + STATS_DESC_COUNTER("itlb_virt_miss_exits"), > + STATS_DESC_COUNTER("dtlb_real_miss_exits"), > + STATS_DESC_COUNTER("dtlb_virt_miss_exits"), > + STATS_DESC_COUNTER("syscall_exits"), > + STATS_DESC_COUNTER("isi_exits"), > + STATS_DESC_COUNTER("dsi_exits"), > + STATS_DESC_COUNTER("emulated_inst_exits"), > + STATS_DESC_COUNTER("dec_exits"), > + STATS_DESC_COUNTER("ext_intr_exits"), > + STATS_DESC_TIME_NSEC("halt_wait_ns"), > + STATS_DESC_COUNTER("halt_successful_wait"), > + STATS_DESC_COUNTER("dbell_exits"), > + STATS_DESC_COUNTER("gdbell_exits"), > + STATS_DESC_COUNTER("ld"), > + STATS_DESC_COUNTER("st"), > + STATS_DESC_COUNTER("pthru_all"), > + STATS_DESC_COUNTER("pthru_host"), > + STATS_DESC_COUNTER("pthru_bad_aff")); > + > +struct _kvm_stats_header kvm_vcpu_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vcpu_stats_desc), > +}; > + > struct kvm_stats_debugfs_item debugfs_entries[] = { > VCPU_STAT("mmio", mmio_exits), > VCPU_STAT("sig", signal_exits), > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index d6bf3372bb10..003feee79fce 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -58,6 +58,123 @@ > #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ > (KVM_MAX_VCPUS + LOCAL_IRQS)) > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > + STATS_DESC_COUNTER("inject_io"), > + STATS_DESC_COUNTER("inject_float_mchk"), > + STATS_DESC_COUNTER("inject_pfault_done"), > + STATS_DESC_COUNTER("inject_service_signal"), > + STATS_DESC_COUNTER("inject_virtio")); > + > +struct _kvm_stats_header kvm_vm_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vm_stats_desc), > +}; > + > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > + STATS_DESC_COUNTER("exit_userspace"), > + STATS_DESC_COUNTER("exit_null"), > + STATS_DESC_COUNTER("exit_external_request"), > + STATS_DESC_COUNTER("exit_io_request"), > + STATS_DESC_COUNTER("exit_external_interrupt"), > + STATS_DESC_COUNTER("exit_stop_request"), > + STATS_DESC_COUNTER("exit_validity"), > + STATS_DESC_COUNTER("exit_instruction"), > + STATS_DESC_COUNTER("exit_pei"), > + STATS_DESC_COUNTER("halt_no_poll_steal"), > + STATS_DESC_COUNTER("instruction_lctl"), > + STATS_DESC_COUNTER("instruction_lctlg"), > + STATS_DESC_COUNTER("instruction_stctl"), > + STATS_DESC_COUNTER("instruction_stctg"), > + STATS_DESC_COUNTER("exit_program_interruption"), > + STATS_DESC_COUNTER("exit_instr_and_program"), > + STATS_DESC_COUNTER("exit_operation_exception"), > + STATS_DESC_COUNTER("deliver_ckc"), > + STATS_DESC_COUNTER("deliver_cputm"), > + STATS_DESC_COUNTER("deliver_external_call"), > + STATS_DESC_COUNTER("deliver_emergency_signal"), > + STATS_DESC_COUNTER("deliver_service_signal"), > + STATS_DESC_COUNTER("deliver_virtio"), > + STATS_DESC_COUNTER("deliver_stop_signal"), > + STATS_DESC_COUNTER("deliver_prefix_signal"), > + STATS_DESC_COUNTER("deliver_restart_signal"), > + STATS_DESC_COUNTER("deliver_program"), > + STATS_DESC_COUNTER("deliver_io"), > + STATS_DESC_COUNTER("deliver_machine_check"), > + STATS_DESC_COUNTER("exit_wait_state"), > + STATS_DESC_COUNTER("inject_ckc"), > + STATS_DESC_COUNTER("inject_cputm"), > + STATS_DESC_COUNTER("inject_external_call"), > + STATS_DESC_COUNTER("inject_emergency_signal"), > + STATS_DESC_COUNTER("inject_mchk"), > + STATS_DESC_COUNTER("inject_pfault_init"), > + STATS_DESC_COUNTER("inject_program"), > + STATS_DESC_COUNTER("inject_restart"), > + STATS_DESC_COUNTER("inject_set_prefix"), > + STATS_DESC_COUNTER("inject_stop_signal"), > + STATS_DESC_COUNTER("instruction_epsw"), > + STATS_DESC_COUNTER("instruction_gs"), > + STATS_DESC_COUNTER("instruction_io_other"), > + STATS_DESC_COUNTER("instruction_lpsw"), > + STATS_DESC_COUNTER("instruction_lpswe"), > + STATS_DESC_COUNTER("instruction_pfmf"), > + STATS_DESC_COUNTER("instruction_ptff"), > + STATS_DESC_COUNTER("instruction_sck"), > + STATS_DESC_COUNTER("instruction_sckpf"), > + STATS_DESC_COUNTER("instruction_stidp"), > + STATS_DESC_COUNTER("instruction_spx"), > + STATS_DESC_COUNTER("instruction_stpx"), > + STATS_DESC_COUNTER("instruction_stap"), > + STATS_DESC_COUNTER("instruction_iske"), > + STATS_DESC_COUNTER("instruction_ri"), > + STATS_DESC_COUNTER("instruction_rrbe"), > + STATS_DESC_COUNTER("instruction_sske"), > + STATS_DESC_COUNTER("instruction_ipte_interlock"), > + STATS_DESC_COUNTER("instruction_stsi"), > + STATS_DESC_COUNTER("instruction_stfl"), > + STATS_DESC_COUNTER("instruction_tb"), > + STATS_DESC_COUNTER("instruction_tpi"), > + STATS_DESC_COUNTER("instruction_tprot"), > + STATS_DESC_COUNTER("instruction_tsch"), > + STATS_DESC_COUNTER("instruction_sie"), > + STATS_DESC_COUNTER("instruction_essa"), > + STATS_DESC_COUNTER("instruction_sthyi"), > + STATS_DESC_COUNTER("instruction_sigp_sense"), > + STATS_DESC_COUNTER("instruction_sigp_sense_running"), > + STATS_DESC_COUNTER("instruction_sigp_external_call"), > + STATS_DESC_COUNTER("instruction_sigp_emergency"), > + STATS_DESC_COUNTER("instruction_sigp_cond_emergency"), > + STATS_DESC_COUNTER("instruction_sigp_start"), > + STATS_DESC_COUNTER("instruction_sigp_stop"), > + STATS_DESC_COUNTER("instruction_sigp_stop_store_status"), > + STATS_DESC_COUNTER("instruction_sigp_store_status"), > + STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"), > + STATS_DESC_COUNTER("instruction_sigp_arch"), > + STATS_DESC_COUNTER("instruction_sigp_prefix"), > + STATS_DESC_COUNTER("instruction_sigp_restart"), > + STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"), > + STATS_DESC_COUNTER("instruction_sigp_cpu_reset"), > + STATS_DESC_COUNTER("instruction_sigp_unknown"), > + STATS_DESC_COUNTER("diagnose_10"), > + STATS_DESC_COUNTER("diagnose_44"), > + STATS_DESC_COUNTER("diagnose_9c"), > + STATS_DESC_COUNTER("diagnose_9c_ignored"), > + STATS_DESC_COUNTER("diagnose_258"), > + STATS_DESC_COUNTER("diagnose_308"), > + STATS_DESC_COUNTER("diagnose_500"), > + STATS_DESC_COUNTER("diagnose_other"), > + STATS_DESC_COUNTER("pfault_sync")); > + > +struct _kvm_stats_header kvm_vcpu_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vcpu_stats_desc), > +}; > + > struct kvm_stats_debugfs_item debugfs_entries[] = { > VCPU_STAT("userspace_handled", exit_userspace), > VCPU_STAT("exit_null", exit_null), > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 9a93d80caff6..84880687c199 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss); > u64 __read_mostly supported_xss; > EXPORT_SYMBOL_GPL(supported_xss); > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > + STATS_DESC_COUNTER("mmu_shadow_zapped"), > + STATS_DESC_COUNTER("mmu_pte_write"), > + STATS_DESC_COUNTER("mmu_pde_zapped"), > + STATS_DESC_COUNTER("mmu_flooded"), > + STATS_DESC_COUNTER("mmu_recycled"), > + STATS_DESC_COUNTER("mmu_cache_miss"), > + STATS_DESC_ICOUNTER("mmu_unsync"), > + STATS_DESC_ICOUNTER("largepages"), > + STATS_DESC_ICOUNTER("nx_largepages_splits"), > + STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions")); > + > +struct _kvm_stats_header kvm_vm_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vm_stats_desc), > +}; > + > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > + STATS_DESC_COUNTER("pf_fixed"), > + STATS_DESC_COUNTER("pf_guest"), > + STATS_DESC_COUNTER("tlb_flush"), > + STATS_DESC_COUNTER("invlpg"), > + STATS_DESC_COUNTER("exits"), > + STATS_DESC_COUNTER("io_exits"), > + STATS_DESC_COUNTER("mmio_exits"), > + STATS_DESC_COUNTER("signal_exits"), > + STATS_DESC_COUNTER("irq_window_exits"), > + STATS_DESC_COUNTER("nmi_window_exits"), > + STATS_DESC_COUNTER("l1d_flush"), > + STATS_DESC_COUNTER("halt_exits"), > + STATS_DESC_COUNTER("request_irq_exits"), > + STATS_DESC_COUNTER("irq_exits"), > + STATS_DESC_COUNTER("host_state_reload"), > + STATS_DESC_COUNTER("fpu_reload"), > + STATS_DESC_COUNTER("insn_emulation"), > + STATS_DESC_COUNTER("insn_emulation_fail"), > + STATS_DESC_COUNTER("hypercalls"), > + STATS_DESC_COUNTER("irq_injections"), > + STATS_DESC_COUNTER("nmi_injections"), > + STATS_DESC_COUNTER("req_event"), > + STATS_DESC_COUNTER("nested_run")); > + > +struct _kvm_stats_header kvm_vcpu_stats_header = { > + .name_size = KVM_STATS_NAME_LEN, > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > + .desc_offset = sizeof(struct kvm_stats_header), > + .data_offset = sizeof(struct kvm_stats_header) + > + sizeof(kvm_vcpu_stats_desc), > +}; > + > struct kvm_stats_debugfs_item debugfs_entries[] = { > VCPU_STAT("pf_fixed", pf_fixed), > VCPU_STAT("pf_guest", pf_guest), > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index 97700e41db3b..52783f8062ca 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item { > int mode; > }; > > +struct _kvm_stats_header { > + __u32 name_size; > + __u32 count; > + __u32 desc_offset; > + __u32 data_offset; > +}; > + > +#define KVM_STATS_NAME_LEN 48 > +struct _kvm_stats_desc { > + struct kvm_stats_desc desc; > + char name[KVM_STATS_NAME_LEN]; > +}; > + > #define KVM_DBGFS_GET_MODE(dbgfs_item) \ > ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644) > > @@ -1253,8 +1266,122 @@ struct kvm_stats_debugfs_item { > { n, offsetof(struct kvm_vcpu, stat.common.x), \ > KVM_STAT_VCPU, ## __VA_ARGS__ } > > +#define STATS_DESC(name, type, unit, scale, exponent) \ > + { \ > + {type | unit | scale, exponent, 1}, name, \ > + } Suggest using designated initializers here. > +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent) \ > + STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent) > +#define STATS_DESC_INSTANT(name, unit, scale, exponent) \ > + STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent) > + > +/* Cumulative counter */ > +#define STATS_DESC_COUNTER(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE, \ > + KVM_STATS_SCALE_POW10, 0) > +/* Instantaneous counter */ > +#define STATS_DESC_ICOUNTER(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE, \ > + KVM_STATS_SCALE_POW10, 0) > + > +/* Cumulative clock cycles */ > +#define STATS_DESC_CYCLE(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES, \ > + KVM_STATS_SCALE_POW10, 0) > +/* Instantaneous clock cycles */ > +#define STATS_DESC_ICYCLE(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES, \ > + KVM_STATS_SCALE_POW10, 0) > + > +/* Cumulative memory size in Byte */ > +#define STATS_DESC_SIZE_BYTE(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 0) > +/* Cumulative memory size in KiByte */ > +#define STATS_DESC_SIZE_KBYTE(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 10) > +/* Cumulative memory size in MiByte */ > +#define STATS_DESC_SIZE_MBYTE(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 20) > +/* Cumulative memory size in GiByte */ > +#define STATS_DESC_SIZE_GBYTE(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 30) > + > +/* Instantaneous memory size in Byte */ > +#define STATS_DESC_ISIZE_BYTE(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 0) > +/* Instantaneous memory size in KiByte */ > +#define STATS_DESC_ISIZE_KBYTE(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 10) > +/* Instantaneous memory size in MiByte */ > +#define STATS_DESC_ISIZE_MBYTE(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 20) > +/* Instantaneous memory size in GiByte */ > +#define STATS_DESC_ISIZE_GBYTE(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > + KVM_STATS_SCALE_POW2, 30) > + > +/* Cumulative time in second */ > +#define STATS_DESC_TIME_SEC(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, 0) > +/* Cumulative time in millisecond */ > +#define STATS_DESC_TIME_MSEC(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, -3) > +/* Cumulative time in microsecond */ > +#define STATS_DESC_TIME_USEC(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, -6) > +/* Cumulative time in nanosecond */ > +#define STATS_DESC_TIME_NSEC(name) \ > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, -9) > + > +/* Instantaneous time in second */ > +#define STATS_DESC_ITIME_SEC(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, 0) > +/* Instantaneous time in millisecond */ > +#define STATS_DESC_ITIME_MSEC(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, -3) > +/* Instantaneous time in microsecond */ > +#define STATS_DESC_ITIME_USEC(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, -6) > +/* Instantaneous time in nanosecond */ > +#define STATS_DESC_ITIME_NSEC(name) \ > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > + KVM_STATS_SCALE_POW10, -9) > + > +#define DEFINE_VM_STATS_DESC(...) { \ > + STATS_DESC_COUNTER("remote_tlb_flush"), \ > + ## __VA_ARGS__ \ > +} > + > +#define DEFINE_VCPU_STATS_DESC(...) { \ > + STATS_DESC_COUNTER("halt_successful_poll"), \ > + STATS_DESC_COUNTER("halt_attempted_poll"), \ > + STATS_DESC_COUNTER("halt_poll_invalid"), \ > + STATS_DESC_COUNTER("halt_wakeup"), \ > + STATS_DESC_TIME_NSEC("halt_poll_success_ns"), \ > + STATS_DESC_TIME_NSEC("halt_poll_fail_ns"), \ > + ## __VA_ARGS__ \ > +} > + > extern struct kvm_stats_debugfs_item debugfs_entries[]; > extern struct dentry *kvm_debugfs_dir; > +extern struct _kvm_stats_header kvm_vm_stats_header; > +extern struct _kvm_stats_header kvm_vcpu_stats_header; > +extern struct _kvm_stats_desc kvm_vm_stats_desc[]; > +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[]; > > #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) > static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq) > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 3fd9a7e9d90c..a64e92c7d9de 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt { > #define KVM_CAP_SGX_ATTRIBUTE 196 > #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197 > #define KVM_CAP_PTP_KVM 198 > +#define KVM_CAP_STATS_BINARY_FD 199 > > #ifdef KVM_CAP_IRQ_ROUTING > > @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn { > #define KVM_BUS_LOCK_DETECTION_OFF (1 << 0) > #define KVM_BUS_LOCK_DETECTION_EXIT (1 << 1) > > +#define KVM_STATS_ID_MAXLEN 64 > + > +struct kvm_stats_header { > + char id[KVM_STATS_ID_MAXLEN]; > + __u32 name_size; > + __u32 count; > + __u32 desc_offset; > + __u32 data_offset; > +}; > + > +#define KVM_STATS_TYPE_SHIFT 0 > +#define KVM_STATS_TYPE_MASK (0xF << KVM_STATS_TYPE_SHIFT) > +#define KVM_STATS_TYPE_CUMULATIVE (0x0 << KVM_STATS_TYPE_SHIFT) > +#define KVM_STATS_TYPE_INSTANT (0x1 << KVM_STATS_TYPE_SHIFT) > +#define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_INSTANT > + > +#define KVM_STATS_UNIT_SHIFT 4 > +#define KVM_STATS_UNIT_MASK (0xF << KVM_STATS_UNIT_SHIFT) > +#define KVM_STATS_UNIT_NONE (0x0 << KVM_STATS_UNIT_SHIFT) > +#define KVM_STATS_UNIT_BYTES (0x1 << KVM_STATS_UNIT_SHIFT) > +#define KVM_STATS_UNIT_SECONDS (0x2 << KVM_STATS_UNIT_SHIFT) > +#define KVM_STATS_UNIT_CYCLES (0x3 << KVM_STATS_UNIT_SHIFT) > +#define KVM_STATS_UNIT_MAX KVM_STATS_UNIT_CYCLES > + > +#define KVM_STATS_SCALE_SHIFT 8 > +#define KVM_STATS_SCALE_MASK (0xF << KVM_STATS_SCALE_SHIFT) > +#define KVM_STATS_SCALE_POW10 (0x0 << KVM_STATS_SCALE_SHIFT) > +#define KVM_STATS_SCALE_POW2 (0x1 << KVM_STATS_SCALE_SHIFT) > +#define KVM_STATS_SCALE_MAX KVM_STATS_SCALE_POW2 > + > +struct kvm_stats_desc { > + __u32 flags; > + __s16 exponent; > + __u16 size; > + __u32 unused1; > + __u32 unused2; > + char name[0]; > +}; > + > +struct kvm_vm_stats_data { > + unsigned long value[0]; > +}; > + > +struct kvm_vcpu_stats_data { > + __u64 value[0]; > +}; > + > +#define KVM_STATS_GETFD _IOR(KVMIO, 0xcc, struct kvm_stats_header) > + > #endif /* __LINUX_KVM_H */ > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index 34a4cf265297..9e2c8dcdeae9 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -3409,6 +3409,115 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) > return 0; > } > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > + size_t size, loff_t *offset) > +{ > + char id[KVM_STATS_ID_MAXLEN]; > + struct kvm_vcpu *vcpu = file->private_data; > + ssize_t copylen, len, remain = size; > + size_t size_header, size_desc, size_stats; > + loff_t pos = *offset; > + char __user *dest = user_buffer; > + void *src; > + > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > + task_pid_nr(current), vcpu->vcpu_id); > + size_header = sizeof(kvm_vcpu_stats_header); > + size_desc = > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > + size_stats = sizeof(vcpu->stat); > + > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > + len = min(len, remain); > + if (len <= 0) > + return 0; > + remain = len; > + > + /* Copy kvm vcpu stats header id string */ > + copylen = sizeof(id) - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)id + pos; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vcpu stats header */ > + copylen = sizeof(id) + size_header - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vcpu_stats_header; > + src += pos - sizeof(id); > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vcpu stats descriptors */ > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vcpu_stats_desc; > + src += pos - kvm_vcpu_stats_header.desc_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } KVM could cache everything above this to avoid the cost of regenerating it on every read. It would require allocating some extra memory in the kernel though, so it's not free. But if userspace is reading stats for every vCPU every second it could be worth it. > + /* Copy kvm vcpu stats values */ > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&vcpu->stat; > + src += pos - kvm_vcpu_stats_header.data_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + > + *offset = pos; > + return len; > +} > + > +static const struct file_operations kvm_vcpu_stats_fops = { > + .read = kvm_vcpu_stats_read, > + .llseek = noop_llseek, > +}; > + > +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu) > +{ > + int error, fd; > + struct file *file; > + char name[15 + ITOA_MAX_LEN + 1]; > + > + snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id); Does this need to be globally unique? I was going to suggest using the id ("kvm-%d/vcpu-%d") but the slash is probably not allowed. It would be nice though to have the file name the same as the id though so maybe change the id and name to something like "kvm-%d.vcpu-%d"? > + > + error = get_unused_fd_flags(O_CLOEXEC); > + if (error < 0) > + return error; > + fd = error; > + > + file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY); > + if (IS_ERR(file)) { > + error = PTR_ERR(file); > + goto err_put_unused_fd; > + } > + file->f_mode |= FMODE_PREAD; > + fd_install(fd, file); > + > + return fd; > + > +err_put_unused_fd: > + put_unused_fd(fd); > + return error; > +} > + > static long kvm_vcpu_ioctl(struct file *filp, > unsigned int ioctl, unsigned long arg) > { > @@ -3606,6 +3715,10 @@ static long kvm_vcpu_ioctl(struct file *filp, > r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); > break; > } > + case KVM_STATS_GETFD: { > + r = kvm_vcpu_ioctl_get_statsfd(vcpu); > + break; > + } > default: > r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); > } > @@ -3864,6 +3977,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) > #else > return 0; > #endif > + case KVM_CAP_STATS_BINARY_FD: > + return 1; > default: > break; > } > @@ -3967,6 +4082,111 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, > } > } > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > + size_t size, loff_t *offset) > +{ > + char id[KVM_STATS_ID_MAXLEN]; > + struct kvm *kvm = file->private_data; > + ssize_t copylen, len, remain = size; > + size_t size_header, size_desc, size_stats; > + loff_t pos = *offset; > + char __user *dest = user_buffer; > + void *src; > + > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > + size_header = sizeof(kvm_vm_stats_header); > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > + size_stats = sizeof(kvm->stat); > + > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > + len = min(len, remain); > + if (len <= 0) > + return 0; > + remain = len; > + > + /* Copy kvm vm stats header id string */ > + copylen = sizeof(id) - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)id + pos; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vm stats header */ > + copylen = sizeof(id) + size_header - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vm_stats_header; > + src += pos - sizeof(id); > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vm stats descriptors */ > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vm_stats_desc; > + src += pos - kvm_vm_stats_header.desc_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } Ditto here about caching. > + /* Copy kvm vm stats values */ > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm->stat; > + src += pos - kvm_vm_stats_header.data_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + > + *offset = pos; > + return len; > +} > + > +static const struct file_operations kvm_vm_stats_fops = { > + .read = kvm_vm_stats_read, > + .llseek = noop_llseek, > +}; > + > +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm) > +{ > + int error, fd; > + struct file *file; > + > + error = get_unused_fd_flags(O_CLOEXEC); > + if (error < 0) > + return error; > + fd = error; > + > + file = anon_inode_getfile("kvm-vm-stats", > + &kvm_vm_stats_fops, kvm, O_RDONLY); > + if (IS_ERR(file)) { > + error = PTR_ERR(file); > + goto err_put_unused_fd; > + } > + file->f_mode |= FMODE_PREAD; > + fd_install(fd, file); > + > + return fd; > + > +err_put_unused_fd: > + put_unused_fd(fd); > + return error; > +} > + > static long kvm_vm_ioctl(struct file *filp, > unsigned int ioctl, unsigned long arg) > { > @@ -4149,6 +4369,9 @@ static long kvm_vm_ioctl(struct file *filp, > case KVM_RESET_DIRTY_RINGS: > r = kvm_vm_ioctl_reset_dirty_pages(kvm); > break; > + case KVM_STATS_GETFD: > + r = kvm_vm_ioctl_get_statsfd(kvm); > + break; > default: > r = kvm_arch_vm_ioctl(filp, ioctl, arg); > } > -- > 2.31.1.751.gd2f1c929bd-goog >
Hi David, On Wed, May 19, 2021 at 12:13 PM David Matlack <dmatlack@google.com> wrote: > > On Mon, May 17, 2021 at 9:32 AM Jing Zhang <jingzhangos@google.com> wrote: > > > > Provides a file descriptor per VM to read VM stats info/data. > > Provides a file descriptor per vCPU to read vCPU stats info/data. > > > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > > --- > > arch/arm64/kvm/guest.c | 26 +++++ > > arch/mips/kvm/mips.c | 52 +++++++++ > > arch/powerpc/kvm/book3s.c | 52 +++++++++ > > arch/powerpc/kvm/booke.c | 45 ++++++++ > > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > > arch/x86/kvm/x86.c | 53 +++++++++ > > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > > include/uapi/linux/kvm.h | 50 +++++++++ > > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > > 9 files changed, 745 insertions(+) > > > > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c > > index 0e41331b0911..1cc1d83630ac 100644 > > --- a/arch/arm64/kvm/guest.c > > +++ b/arch/arm64/kvm/guest.c > > @@ -28,6 +28,32 @@ > > > > #include "trace.h" > > > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); > > + > > +struct _kvm_stats_header kvm_vm_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vm_stats_desc), > > +}; > > + > > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > > + STATS_DESC_COUNTER("hvc_exit_stat"), > > + STATS_DESC_COUNTER("wfe_exit_stat"), > > + STATS_DESC_COUNTER("wfi_exit_stat"), > > + STATS_DESC_COUNTER("mmio_exit_user"), > > + STATS_DESC_COUNTER("mmio_exit_kernel"), > > + STATS_DESC_COUNTER("exits")); > > + > > +struct _kvm_stats_header kvm_vcpu_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vcpu_stats_desc), > > +}; > > + > > struct kvm_stats_debugfs_item debugfs_entries[] = { > > VCPU_STAT_COM("halt_successful_poll", halt_successful_poll), > > VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), > > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c > > index f4fc60c05e9c..f17a65743ccd 100644 > > --- a/arch/mips/kvm/mips.c > > +++ b/arch/mips/kvm/mips.c > > @@ -38,6 +38,58 @@ > > #define VECTORSPACING 0x100 /* for EI/VI mode */ > > #endif > > > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); > > + > > +struct _kvm_stats_header kvm_vm_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vm_stats_desc), > > +}; > > + > > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > > + STATS_DESC_COUNTER("wait_exits"), > > + STATS_DESC_COUNTER("cache_exits"), > > + STATS_DESC_COUNTER("signal_exits"), > > + STATS_DESC_COUNTER("int_exits"), > > + STATS_DESC_COUNTER("cop_unusable_exits"), > > + STATS_DESC_COUNTER("tlbmod_exits"), > > + STATS_DESC_COUNTER("tlbmiss_ld_exits"), > > + STATS_DESC_COUNTER("tlbmiss_st_exits"), > > + STATS_DESC_COUNTER("addrerr_st_exits"), > > + STATS_DESC_COUNTER("addrerr_ld_exits"), > > + STATS_DESC_COUNTER("syscall_exits"), > > + STATS_DESC_COUNTER("resvd_inst_exits"), > > + STATS_DESC_COUNTER("break_inst_exits"), > > + STATS_DESC_COUNTER("trap_inst_exits"), > > + STATS_DESC_COUNTER("msa_fpe_exits"), > > + STATS_DESC_COUNTER("fpe_exits"), > > + STATS_DESC_COUNTER("msa_disabled_exits"), > > + STATS_DESC_COUNTER("flush_dcache_exits"), > > +#ifdef CONFIG_KVM_MIPS_VZ > > + STATS_DESC_COUNTER("vz_gpsi_exits"), > > + STATS_DESC_COUNTER("vz_gsfc_exits"), > > + STATS_DESC_COUNTER("vz_hc_exits"), > > + STATS_DESC_COUNTER("vz_grr_exits"), > > + STATS_DESC_COUNTER("vz_gva_exits"), > > + STATS_DESC_COUNTER("vz_ghfc_exits"), > > + STATS_DESC_COUNTER("vz_gpa_exits"), > > + STATS_DESC_COUNTER("vz_resvd_exits"), > > +#ifdef CONFIG_CPU_LOONGSON64 > > + STATS_DESC_COUNTER("vz_cpucfg_exits"), > > +#endif > > +#endif > > + ); > > + > > +struct _kvm_stats_header kvm_vcpu_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vcpu_stats_desc), > > +}; > > + > > struct kvm_stats_debugfs_item debugfs_entries[] = { > > VCPU_STAT("wait", wait_exits), > > VCPU_STAT("cache", cache_exits), > > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c > > index bd3a10e1fdaf..5e8ee0d39ef9 100644 > > --- a/arch/powerpc/kvm/book3s.c > > +++ b/arch/powerpc/kvm/book3s.c > > @@ -38,6 +38,58 @@ > > > > /* #define EXIT_DEBUG */ > > > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > > + STATS_DESC_ICOUNTER("num_2M_pages"), > > + STATS_DESC_ICOUNTER("num_1G_pages")); > > + > > +struct _kvm_stats_header kvm_vm_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vm_stats_desc), > > +}; > > + > > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > > + STATS_DESC_COUNTER("sum_exits"), > > + STATS_DESC_COUNTER("mmio_exits"), > > + STATS_DESC_COUNTER("signal_exits"), > > + STATS_DESC_COUNTER("light_exits"), > > + STATS_DESC_COUNTER("itlb_real_miss_exits"), > > + STATS_DESC_COUNTER("itlb_virt_miss_exits"), > > + STATS_DESC_COUNTER("dtlb_real_miss_exits"), > > + STATS_DESC_COUNTER("dtlb_virt_miss_exits"), > > + STATS_DESC_COUNTER("syscall_exits"), > > + STATS_DESC_COUNTER("isi_exits"), > > + STATS_DESC_COUNTER("dsi_exits"), > > + STATS_DESC_COUNTER("emulated_inst_exits"), > > + STATS_DESC_COUNTER("dec_exits"), > > + STATS_DESC_COUNTER("ext_intr_exits"), > > + STATS_DESC_TIME_NSEC("halt_wait_ns"), > > + STATS_DESC_COUNTER("halt_successful_wait"), > > + STATS_DESC_COUNTER("dbell_exits"), > > + STATS_DESC_COUNTER("gdbell_exits"), > > + STATS_DESC_COUNTER("ld"), > > + STATS_DESC_COUNTER("st"), > > + STATS_DESC_COUNTER("pf_storage"), > > + STATS_DESC_COUNTER("pf_instruc"), > > + STATS_DESC_COUNTER("sp_storage"), > > + STATS_DESC_COUNTER("sp_instruc"), > > + STATS_DESC_COUNTER("queue_intr"), > > + STATS_DESC_COUNTER("ld_slow"), > > + STATS_DESC_COUNTER("st_slow"), > > + STATS_DESC_COUNTER("pthru_all"), > > + STATS_DESC_COUNTER("pthru_host"), > > + STATS_DESC_COUNTER("pthru_bad_aff")); > > + > > +struct _kvm_stats_header kvm_vcpu_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vcpu_stats_desc), > > +}; > > + > > struct kvm_stats_debugfs_item debugfs_entries[] = { > > VCPU_STAT("exits", sum_exits), > > VCPU_STAT("mmio", mmio_exits), > > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c > > index 07fdd7a1254a..86d221e9193e 100644 > > --- a/arch/powerpc/kvm/booke.c > > +++ b/arch/powerpc/kvm/booke.c > > @@ -36,6 +36,51 @@ > > > > unsigned long kvmppc_booke_handlers; > > > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > > + STATS_DESC_ICOUNTER("num_2M_pages"), > > + STATS_DESC_ICOUNTER("num_1G_pages")); > > + > > +struct _kvm_stats_header kvm_vm_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vm_stats_desc), > > +}; > > + > > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > > + STATS_DESC_COUNTER("sum_exits"), > > + STATS_DESC_COUNTER("mmio_exits"), > > + STATS_DESC_COUNTER("signal_exits"), > > + STATS_DESC_COUNTER("light_exits"), > > + STATS_DESC_COUNTER("itlb_real_miss_exits"), > > + STATS_DESC_COUNTER("itlb_virt_miss_exits"), > > + STATS_DESC_COUNTER("dtlb_real_miss_exits"), > > + STATS_DESC_COUNTER("dtlb_virt_miss_exits"), > > + STATS_DESC_COUNTER("syscall_exits"), > > + STATS_DESC_COUNTER("isi_exits"), > > + STATS_DESC_COUNTER("dsi_exits"), > > + STATS_DESC_COUNTER("emulated_inst_exits"), > > + STATS_DESC_COUNTER("dec_exits"), > > + STATS_DESC_COUNTER("ext_intr_exits"), > > + STATS_DESC_TIME_NSEC("halt_wait_ns"), > > + STATS_DESC_COUNTER("halt_successful_wait"), > > + STATS_DESC_COUNTER("dbell_exits"), > > + STATS_DESC_COUNTER("gdbell_exits"), > > + STATS_DESC_COUNTER("ld"), > > + STATS_DESC_COUNTER("st"), > > + STATS_DESC_COUNTER("pthru_all"), > > + STATS_DESC_COUNTER("pthru_host"), > > + STATS_DESC_COUNTER("pthru_bad_aff")); > > + > > +struct _kvm_stats_header kvm_vcpu_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vcpu_stats_desc), > > +}; > > + > > struct kvm_stats_debugfs_item debugfs_entries[] = { > > VCPU_STAT("mmio", mmio_exits), > > VCPU_STAT("sig", signal_exits), > > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > > index d6bf3372bb10..003feee79fce 100644 > > --- a/arch/s390/kvm/kvm-s390.c > > +++ b/arch/s390/kvm/kvm-s390.c > > @@ -58,6 +58,123 @@ > > #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ > > (KVM_MAX_VCPUS + LOCAL_IRQS)) > > > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > > + STATS_DESC_COUNTER("inject_io"), > > + STATS_DESC_COUNTER("inject_float_mchk"), > > + STATS_DESC_COUNTER("inject_pfault_done"), > > + STATS_DESC_COUNTER("inject_service_signal"), > > + STATS_DESC_COUNTER("inject_virtio")); > > + > > +struct _kvm_stats_header kvm_vm_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vm_stats_desc), > > +}; > > + > > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > > + STATS_DESC_COUNTER("exit_userspace"), > > + STATS_DESC_COUNTER("exit_null"), > > + STATS_DESC_COUNTER("exit_external_request"), > > + STATS_DESC_COUNTER("exit_io_request"), > > + STATS_DESC_COUNTER("exit_external_interrupt"), > > + STATS_DESC_COUNTER("exit_stop_request"), > > + STATS_DESC_COUNTER("exit_validity"), > > + STATS_DESC_COUNTER("exit_instruction"), > > + STATS_DESC_COUNTER("exit_pei"), > > + STATS_DESC_COUNTER("halt_no_poll_steal"), > > + STATS_DESC_COUNTER("instruction_lctl"), > > + STATS_DESC_COUNTER("instruction_lctlg"), > > + STATS_DESC_COUNTER("instruction_stctl"), > > + STATS_DESC_COUNTER("instruction_stctg"), > > + STATS_DESC_COUNTER("exit_program_interruption"), > > + STATS_DESC_COUNTER("exit_instr_and_program"), > > + STATS_DESC_COUNTER("exit_operation_exception"), > > + STATS_DESC_COUNTER("deliver_ckc"), > > + STATS_DESC_COUNTER("deliver_cputm"), > > + STATS_DESC_COUNTER("deliver_external_call"), > > + STATS_DESC_COUNTER("deliver_emergency_signal"), > > + STATS_DESC_COUNTER("deliver_service_signal"), > > + STATS_DESC_COUNTER("deliver_virtio"), > > + STATS_DESC_COUNTER("deliver_stop_signal"), > > + STATS_DESC_COUNTER("deliver_prefix_signal"), > > + STATS_DESC_COUNTER("deliver_restart_signal"), > > + STATS_DESC_COUNTER("deliver_program"), > > + STATS_DESC_COUNTER("deliver_io"), > > + STATS_DESC_COUNTER("deliver_machine_check"), > > + STATS_DESC_COUNTER("exit_wait_state"), > > + STATS_DESC_COUNTER("inject_ckc"), > > + STATS_DESC_COUNTER("inject_cputm"), > > + STATS_DESC_COUNTER("inject_external_call"), > > + STATS_DESC_COUNTER("inject_emergency_signal"), > > + STATS_DESC_COUNTER("inject_mchk"), > > + STATS_DESC_COUNTER("inject_pfault_init"), > > + STATS_DESC_COUNTER("inject_program"), > > + STATS_DESC_COUNTER("inject_restart"), > > + STATS_DESC_COUNTER("inject_set_prefix"), > > + STATS_DESC_COUNTER("inject_stop_signal"), > > + STATS_DESC_COUNTER("instruction_epsw"), > > + STATS_DESC_COUNTER("instruction_gs"), > > + STATS_DESC_COUNTER("instruction_io_other"), > > + STATS_DESC_COUNTER("instruction_lpsw"), > > + STATS_DESC_COUNTER("instruction_lpswe"), > > + STATS_DESC_COUNTER("instruction_pfmf"), > > + STATS_DESC_COUNTER("instruction_ptff"), > > + STATS_DESC_COUNTER("instruction_sck"), > > + STATS_DESC_COUNTER("instruction_sckpf"), > > + STATS_DESC_COUNTER("instruction_stidp"), > > + STATS_DESC_COUNTER("instruction_spx"), > > + STATS_DESC_COUNTER("instruction_stpx"), > > + STATS_DESC_COUNTER("instruction_stap"), > > + STATS_DESC_COUNTER("instruction_iske"), > > + STATS_DESC_COUNTER("instruction_ri"), > > + STATS_DESC_COUNTER("instruction_rrbe"), > > + STATS_DESC_COUNTER("instruction_sske"), > > + STATS_DESC_COUNTER("instruction_ipte_interlock"), > > + STATS_DESC_COUNTER("instruction_stsi"), > > + STATS_DESC_COUNTER("instruction_stfl"), > > + STATS_DESC_COUNTER("instruction_tb"), > > + STATS_DESC_COUNTER("instruction_tpi"), > > + STATS_DESC_COUNTER("instruction_tprot"), > > + STATS_DESC_COUNTER("instruction_tsch"), > > + STATS_DESC_COUNTER("instruction_sie"), > > + STATS_DESC_COUNTER("instruction_essa"), > > + STATS_DESC_COUNTER("instruction_sthyi"), > > + STATS_DESC_COUNTER("instruction_sigp_sense"), > > + STATS_DESC_COUNTER("instruction_sigp_sense_running"), > > + STATS_DESC_COUNTER("instruction_sigp_external_call"), > > + STATS_DESC_COUNTER("instruction_sigp_emergency"), > > + STATS_DESC_COUNTER("instruction_sigp_cond_emergency"), > > + STATS_DESC_COUNTER("instruction_sigp_start"), > > + STATS_DESC_COUNTER("instruction_sigp_stop"), > > + STATS_DESC_COUNTER("instruction_sigp_stop_store_status"), > > + STATS_DESC_COUNTER("instruction_sigp_store_status"), > > + STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"), > > + STATS_DESC_COUNTER("instruction_sigp_arch"), > > + STATS_DESC_COUNTER("instruction_sigp_prefix"), > > + STATS_DESC_COUNTER("instruction_sigp_restart"), > > + STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"), > > + STATS_DESC_COUNTER("instruction_sigp_cpu_reset"), > > + STATS_DESC_COUNTER("instruction_sigp_unknown"), > > + STATS_DESC_COUNTER("diagnose_10"), > > + STATS_DESC_COUNTER("diagnose_44"), > > + STATS_DESC_COUNTER("diagnose_9c"), > > + STATS_DESC_COUNTER("diagnose_9c_ignored"), > > + STATS_DESC_COUNTER("diagnose_258"), > > + STATS_DESC_COUNTER("diagnose_308"), > > + STATS_DESC_COUNTER("diagnose_500"), > > + STATS_DESC_COUNTER("diagnose_other"), > > + STATS_DESC_COUNTER("pfault_sync")); > > + > > +struct _kvm_stats_header kvm_vcpu_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vcpu_stats_desc), > > +}; > > + > > struct kvm_stats_debugfs_item debugfs_entries[] = { > > VCPU_STAT("userspace_handled", exit_userspace), > > VCPU_STAT("exit_null", exit_null), > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > > index 9a93d80caff6..84880687c199 100644 > > --- a/arch/x86/kvm/x86.c > > +++ b/arch/x86/kvm/x86.c > > @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss); > > u64 __read_mostly supported_xss; > > EXPORT_SYMBOL_GPL(supported_xss); > > > > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( > > + STATS_DESC_COUNTER("mmu_shadow_zapped"), > > + STATS_DESC_COUNTER("mmu_pte_write"), > > + STATS_DESC_COUNTER("mmu_pde_zapped"), > > + STATS_DESC_COUNTER("mmu_flooded"), > > + STATS_DESC_COUNTER("mmu_recycled"), > > + STATS_DESC_COUNTER("mmu_cache_miss"), > > + STATS_DESC_ICOUNTER("mmu_unsync"), > > + STATS_DESC_ICOUNTER("largepages"), > > + STATS_DESC_ICOUNTER("nx_largepages_splits"), > > + STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions")); > > + > > +struct _kvm_stats_header kvm_vm_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vm_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vm_stats_desc), > > +}; > > + > > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( > > + STATS_DESC_COUNTER("pf_fixed"), > > + STATS_DESC_COUNTER("pf_guest"), > > + STATS_DESC_COUNTER("tlb_flush"), > > + STATS_DESC_COUNTER("invlpg"), > > + STATS_DESC_COUNTER("exits"), > > + STATS_DESC_COUNTER("io_exits"), > > + STATS_DESC_COUNTER("mmio_exits"), > > + STATS_DESC_COUNTER("signal_exits"), > > + STATS_DESC_COUNTER("irq_window_exits"), > > + STATS_DESC_COUNTER("nmi_window_exits"), > > + STATS_DESC_COUNTER("l1d_flush"), > > + STATS_DESC_COUNTER("halt_exits"), > > + STATS_DESC_COUNTER("request_irq_exits"), > > + STATS_DESC_COUNTER("irq_exits"), > > + STATS_DESC_COUNTER("host_state_reload"), > > + STATS_DESC_COUNTER("fpu_reload"), > > + STATS_DESC_COUNTER("insn_emulation"), > > + STATS_DESC_COUNTER("insn_emulation_fail"), > > + STATS_DESC_COUNTER("hypercalls"), > > + STATS_DESC_COUNTER("irq_injections"), > > + STATS_DESC_COUNTER("nmi_injections"), > > + STATS_DESC_COUNTER("req_event"), > > + STATS_DESC_COUNTER("nested_run")); > > + > > +struct _kvm_stats_header kvm_vcpu_stats_header = { > > + .name_size = KVM_STATS_NAME_LEN, > > + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), > > + .desc_offset = sizeof(struct kvm_stats_header), > > + .data_offset = sizeof(struct kvm_stats_header) + > > + sizeof(kvm_vcpu_stats_desc), > > +}; > > + > > struct kvm_stats_debugfs_item debugfs_entries[] = { > > VCPU_STAT("pf_fixed", pf_fixed), > > VCPU_STAT("pf_guest", pf_guest), > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > > index 97700e41db3b..52783f8062ca 100644 > > --- a/include/linux/kvm_host.h > > +++ b/include/linux/kvm_host.h > > @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item { > > int mode; > > }; > > > > +struct _kvm_stats_header { > > + __u32 name_size; > > + __u32 count; > > + __u32 desc_offset; > > + __u32 data_offset; > > +}; > > + > > +#define KVM_STATS_NAME_LEN 48 > > +struct _kvm_stats_desc { > > + struct kvm_stats_desc desc; > > + char name[KVM_STATS_NAME_LEN]; > > +}; > > + > > #define KVM_DBGFS_GET_MODE(dbgfs_item) \ > > ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644) > > > > @@ -1253,8 +1266,122 @@ struct kvm_stats_debugfs_item { > > { n, offsetof(struct kvm_vcpu, stat.common.x), \ > > KVM_STAT_VCPU, ## __VA_ARGS__ } > > > > +#define STATS_DESC(name, type, unit, scale, exponent) \ > > + { \ > > + {type | unit | scale, exponent, 1}, name, \ > > + } > > Suggest using designated initializers here. > Sure, will do. > > +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent) \ > > + STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent) > > +#define STATS_DESC_INSTANT(name, unit, scale, exponent) \ > > + STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent) > > + > > +/* Cumulative counter */ > > +#define STATS_DESC_COUNTER(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE, \ > > + KVM_STATS_SCALE_POW10, 0) > > +/* Instantaneous counter */ > > +#define STATS_DESC_ICOUNTER(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE, \ > > + KVM_STATS_SCALE_POW10, 0) > > + > > +/* Cumulative clock cycles */ > > +#define STATS_DESC_CYCLE(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES, \ > > + KVM_STATS_SCALE_POW10, 0) > > +/* Instantaneous clock cycles */ > > +#define STATS_DESC_ICYCLE(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES, \ > > + KVM_STATS_SCALE_POW10, 0) > > + > > +/* Cumulative memory size in Byte */ > > +#define STATS_DESC_SIZE_BYTE(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 0) > > +/* Cumulative memory size in KiByte */ > > +#define STATS_DESC_SIZE_KBYTE(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 10) > > +/* Cumulative memory size in MiByte */ > > +#define STATS_DESC_SIZE_MBYTE(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 20) > > +/* Cumulative memory size in GiByte */ > > +#define STATS_DESC_SIZE_GBYTE(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 30) > > + > > +/* Instantaneous memory size in Byte */ > > +#define STATS_DESC_ISIZE_BYTE(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 0) > > +/* Instantaneous memory size in KiByte */ > > +#define STATS_DESC_ISIZE_KBYTE(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 10) > > +/* Instantaneous memory size in MiByte */ > > +#define STATS_DESC_ISIZE_MBYTE(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 20) > > +/* Instantaneous memory size in GiByte */ > > +#define STATS_DESC_ISIZE_GBYTE(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ > > + KVM_STATS_SCALE_POW2, 30) > > + > > +/* Cumulative time in second */ > > +#define STATS_DESC_TIME_SEC(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, 0) > > +/* Cumulative time in millisecond */ > > +#define STATS_DESC_TIME_MSEC(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, -3) > > +/* Cumulative time in microsecond */ > > +#define STATS_DESC_TIME_USEC(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, -6) > > +/* Cumulative time in nanosecond */ > > +#define STATS_DESC_TIME_NSEC(name) \ > > + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, -9) > > + > > +/* Instantaneous time in second */ > > +#define STATS_DESC_ITIME_SEC(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, 0) > > +/* Instantaneous time in millisecond */ > > +#define STATS_DESC_ITIME_MSEC(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, -3) > > +/* Instantaneous time in microsecond */ > > +#define STATS_DESC_ITIME_USEC(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, -6) > > +/* Instantaneous time in nanosecond */ > > +#define STATS_DESC_ITIME_NSEC(name) \ > > + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ > > + KVM_STATS_SCALE_POW10, -9) > > + > > +#define DEFINE_VM_STATS_DESC(...) { \ > > + STATS_DESC_COUNTER("remote_tlb_flush"), \ > > + ## __VA_ARGS__ \ > > +} > > + > > +#define DEFINE_VCPU_STATS_DESC(...) { \ > > + STATS_DESC_COUNTER("halt_successful_poll"), \ > > + STATS_DESC_COUNTER("halt_attempted_poll"), \ > > + STATS_DESC_COUNTER("halt_poll_invalid"), \ > > + STATS_DESC_COUNTER("halt_wakeup"), \ > > + STATS_DESC_TIME_NSEC("halt_poll_success_ns"), \ > > + STATS_DESC_TIME_NSEC("halt_poll_fail_ns"), \ > > + ## __VA_ARGS__ \ > > +} > > + > > extern struct kvm_stats_debugfs_item debugfs_entries[]; > > extern struct dentry *kvm_debugfs_dir; > > +extern struct _kvm_stats_header kvm_vm_stats_header; > > +extern struct _kvm_stats_header kvm_vcpu_stats_header; > > +extern struct _kvm_stats_desc kvm_vm_stats_desc[]; > > +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[]; > > > > #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) > > static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq) > > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > > index 3fd9a7e9d90c..a64e92c7d9de 100644 > > --- a/include/uapi/linux/kvm.h > > +++ b/include/uapi/linux/kvm.h > > @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt { > > #define KVM_CAP_SGX_ATTRIBUTE 196 > > #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197 > > #define KVM_CAP_PTP_KVM 198 > > +#define KVM_CAP_STATS_BINARY_FD 199 > > > > #ifdef KVM_CAP_IRQ_ROUTING > > > > @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn { > > #define KVM_BUS_LOCK_DETECTION_OFF (1 << 0) > > #define KVM_BUS_LOCK_DETECTION_EXIT (1 << 1) > > > > +#define KVM_STATS_ID_MAXLEN 64 > > + > > +struct kvm_stats_header { > > + char id[KVM_STATS_ID_MAXLEN]; > > + __u32 name_size; > > + __u32 count; > > + __u32 desc_offset; > > + __u32 data_offset; > > +}; > > + > > +#define KVM_STATS_TYPE_SHIFT 0 > > +#define KVM_STATS_TYPE_MASK (0xF << KVM_STATS_TYPE_SHIFT) > > +#define KVM_STATS_TYPE_CUMULATIVE (0x0 << KVM_STATS_TYPE_SHIFT) > > +#define KVM_STATS_TYPE_INSTANT (0x1 << KVM_STATS_TYPE_SHIFT) > > +#define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_INSTANT > > + > > +#define KVM_STATS_UNIT_SHIFT 4 > > +#define KVM_STATS_UNIT_MASK (0xF << KVM_STATS_UNIT_SHIFT) > > +#define KVM_STATS_UNIT_NONE (0x0 << KVM_STATS_UNIT_SHIFT) > > +#define KVM_STATS_UNIT_BYTES (0x1 << KVM_STATS_UNIT_SHIFT) > > +#define KVM_STATS_UNIT_SECONDS (0x2 << KVM_STATS_UNIT_SHIFT) > > +#define KVM_STATS_UNIT_CYCLES (0x3 << KVM_STATS_UNIT_SHIFT) > > +#define KVM_STATS_UNIT_MAX KVM_STATS_UNIT_CYCLES > > + > > +#define KVM_STATS_SCALE_SHIFT 8 > > +#define KVM_STATS_SCALE_MASK (0xF << KVM_STATS_SCALE_SHIFT) > > +#define KVM_STATS_SCALE_POW10 (0x0 << KVM_STATS_SCALE_SHIFT) > > +#define KVM_STATS_SCALE_POW2 (0x1 << KVM_STATS_SCALE_SHIFT) > > +#define KVM_STATS_SCALE_MAX KVM_STATS_SCALE_POW2 > > + > > +struct kvm_stats_desc { > > + __u32 flags; > > + __s16 exponent; > > + __u16 size; > > + __u32 unused1; > > + __u32 unused2; > > + char name[0]; > > +}; > > + > > +struct kvm_vm_stats_data { > > + unsigned long value[0]; > > +}; > > + > > +struct kvm_vcpu_stats_data { > > + __u64 value[0]; > > +}; > > + > > +#define KVM_STATS_GETFD _IOR(KVMIO, 0xcc, struct kvm_stats_header) > > + > > #endif /* __LINUX_KVM_H */ > > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > > index 34a4cf265297..9e2c8dcdeae9 100644 > > --- a/virt/kvm/kvm_main.c > > +++ b/virt/kvm/kvm_main.c > > @@ -3409,6 +3409,115 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) > > return 0; > > } > > > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > > + size_t size, loff_t *offset) > > +{ > > + char id[KVM_STATS_ID_MAXLEN]; > > + struct kvm_vcpu *vcpu = file->private_data; > > + ssize_t copylen, len, remain = size; > > + size_t size_header, size_desc, size_stats; > > + loff_t pos = *offset; > > + char __user *dest = user_buffer; > > + void *src; > > + > > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > > + task_pid_nr(current), vcpu->vcpu_id); > > + size_header = sizeof(kvm_vcpu_stats_header); > > + size_desc = > > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > > + size_stats = sizeof(vcpu->stat); > > + > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > + len = min(len, remain); > > + if (len <= 0) > > + return 0; > > + remain = len; > > + > > + /* Copy kvm vcpu stats header id string */ > > + copylen = sizeof(id) - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)id + pos; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vcpu stats header */ > > + copylen = sizeof(id) + size_header - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vcpu_stats_header; > > + src += pos - sizeof(id); > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vcpu stats descriptors */ > > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vcpu_stats_desc; > > + src += pos - kvm_vcpu_stats_header.desc_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > KVM could cache everything above this to avoid the cost of > regenerating it on every read. It would require allocating some extra > memory in the kernel though, so it's not free. But if userspace is > reading stats for every vCPU every second it could be worth it. > Stats descriptors are only read one time for every VM and VCPU during a VM boot. No cache is needed. > > + /* Copy kvm vcpu stats values */ > > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&vcpu->stat; > > + src += pos - kvm_vcpu_stats_header.data_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + > > + *offset = pos; > > + return len; > > +} > > + > > +static const struct file_operations kvm_vcpu_stats_fops = { > > + .read = kvm_vcpu_stats_read, > > + .llseek = noop_llseek, > > +}; > > + > > +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu) > > +{ > > + int error, fd; > > + struct file *file; > > + char name[15 + ITOA_MAX_LEN + 1]; > > + > > + snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id); > > Does this need to be globally unique? I was going to suggest using the > id ("kvm-%d/vcpu-%d") but the slash is probably not allowed. It would > be nice though to have the file name the same as the id though so > maybe change the id and name to something like "kvm-%d.vcpu-%d"? > The name passed into anon_inode_getfile is called a "class name" used for dentry names which is associated with the anonymous inode. According to the first commit for anonymous indoe support below, we know that the name actually doesn't matter for anything. https://github.com/torvalds/linux/commit/5dc8bf8132d59c03fe2562bce165c2f03f021687 This name is not related to the id in any way. Will keep the id format as it is. > > + > > + error = get_unused_fd_flags(O_CLOEXEC); > > + if (error < 0) > > + return error; > > + fd = error; > > + > > + file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY); > > + if (IS_ERR(file)) { > > + error = PTR_ERR(file); > > + goto err_put_unused_fd; > > + } > > + file->f_mode |= FMODE_PREAD; > > + fd_install(fd, file); > > + > > + return fd; > > + > > +err_put_unused_fd: > > + put_unused_fd(fd); > > + return error; > > +} > > + > > static long kvm_vcpu_ioctl(struct file *filp, > > unsigned int ioctl, unsigned long arg) > > { > > @@ -3606,6 +3715,10 @@ static long kvm_vcpu_ioctl(struct file *filp, > > r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); > > break; > > } > > + case KVM_STATS_GETFD: { > > + r = kvm_vcpu_ioctl_get_statsfd(vcpu); > > + break; > > + } > > default: > > r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); > > } > > @@ -3864,6 +3977,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) > > #else > > return 0; > > #endif > > + case KVM_CAP_STATS_BINARY_FD: > > + return 1; > > default: > > break; > > } > > @@ -3967,6 +4082,111 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, > > } > > } > > > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > > + size_t size, loff_t *offset) > > +{ > > + char id[KVM_STATS_ID_MAXLEN]; > > + struct kvm *kvm = file->private_data; > > + ssize_t copylen, len, remain = size; > > + size_t size_header, size_desc, size_stats; > > + loff_t pos = *offset; > > + char __user *dest = user_buffer; > > + void *src; > > + > > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > > + size_header = sizeof(kvm_vm_stats_header); > > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > > + size_stats = sizeof(kvm->stat); > > + > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > + len = min(len, remain); > > + if (len <= 0) > > + return 0; > > + remain = len; > > + > > + /* Copy kvm vm stats header id string */ > > + copylen = sizeof(id) - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)id + pos; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vm stats header */ > > + copylen = sizeof(id) + size_header - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vm_stats_header; > > + src += pos - sizeof(id); > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vm stats descriptors */ > > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vm_stats_desc; > > + src += pos - kvm_vm_stats_header.desc_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > Ditto here about caching. > > > > + /* Copy kvm vm stats values */ > > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm->stat; > > + src += pos - kvm_vm_stats_header.data_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + > > + *offset = pos; > > + return len; > > +} > > + > > +static const struct file_operations kvm_vm_stats_fops = { > > + .read = kvm_vm_stats_read, > > + .llseek = noop_llseek, > > +}; > > + > > +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm) > > +{ > > + int error, fd; > > + struct file *file; > > + > > + error = get_unused_fd_flags(O_CLOEXEC); > > + if (error < 0) > > + return error; > > + fd = error; > > + > > + file = anon_inode_getfile("kvm-vm-stats", > > + &kvm_vm_stats_fops, kvm, O_RDONLY); > > + if (IS_ERR(file)) { > > + error = PTR_ERR(file); > > + goto err_put_unused_fd; > > + } > > + file->f_mode |= FMODE_PREAD; > > + fd_install(fd, file); > > + > > + return fd; > > + > > +err_put_unused_fd: > > + put_unused_fd(fd); > > + return error; > > +} > > + > > static long kvm_vm_ioctl(struct file *filp, > > unsigned int ioctl, unsigned long arg) > > { > > @@ -4149,6 +4369,9 @@ static long kvm_vm_ioctl(struct file *filp, > > case KVM_RESET_DIRTY_RINGS: > > r = kvm_vm_ioctl_reset_dirty_pages(kvm); > > break; > > + case KVM_STATS_GETFD: > > + r = kvm_vm_ioctl_get_statsfd(kvm); > > + break; > > default: > > r = kvm_arch_vm_ioctl(filp, ioctl, arg); > > } > > -- > > 2.31.1.751.gd2f1c929bd-goog > > Thanks, Jing
On Mon, May 17, 2021 at 02:53:12PM +0000, Jing Zhang wrote: > Provides a file descriptor per VM to read VM stats info/data. > Provides a file descriptor per vCPU to read vCPU stats info/data. > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > --- > arch/arm64/kvm/guest.c | 26 +++++ > arch/mips/kvm/mips.c | 52 +++++++++ > arch/powerpc/kvm/book3s.c | 52 +++++++++ > arch/powerpc/kvm/booke.c | 45 ++++++++ > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > arch/x86/kvm/x86.c | 53 +++++++++ > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > include/uapi/linux/kvm.h | 50 +++++++++ > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > 9 files changed, 745 insertions(+) > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > + size_t size, loff_t *offset) > +{ > + char id[KVM_STATS_ID_MAXLEN]; > + struct kvm_vcpu *vcpu = file->private_data; > + ssize_t copylen, len, remain = size; > + size_t size_header, size_desc, size_stats; > + loff_t pos = *offset; > + char __user *dest = user_buffer; > + void *src; Nit. Better to do pointer arithmetic on a "char *". Note that gcc and clang will do the expected thing. > + > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > + task_pid_nr(current), vcpu->vcpu_id); > + size_header = sizeof(kvm_vcpu_stats_header); > + size_desc = > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > + size_stats = sizeof(vcpu->stat); > + > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > + len = min(len, remain); > + if (len <= 0) > + return 0; > + remain = len; If 'desc_offset' is not right after the header, then the 'len' calculation is missing the gap into account. For example, assuming there is a gap of 0x1000000 between the header and the descriptors: desc_offset = sizeof(id) + size_header + 0x1000000 and the user calls the ioctl with enough space for the whole file, including the gap: *offset = 0 size = sizeof(id) + size_header + size_desc + size_stats + 0x1000000 then 'remain' gets the wrong size: remain = sizeof(id) + size_header + size_desc + size_stats and ... (more below) > + > + /* Copy kvm vcpu stats header id string */ > + copylen = sizeof(id) - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)id + pos; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vcpu stats header */ > + copylen = sizeof(id) + size_header - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vcpu_stats_header; > + src += pos - sizeof(id); > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vcpu stats descriptors */ > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; This would be the state at this point: pos = sizeof(id) + size_header copylen = sizeof(id) + size_header + 0x1000000 + size_desc - (sizeof(id) + size_header) = 0x1000000 + size_desc remain = size_desc + size_stats > + copylen = min(copylen, remain); copylen = size_desc + size_stats which is not enough to copy the descriptors (and the data). > + if (copylen > 0) { > + src = (void *)&kvm_vcpu_stats_desc; > + src += pos - kvm_vcpu_stats_header.desc_offset; Moreover, src also needs to take the gap into account. src = &kvm_vcpu_stats_desc + (sizeof(id) + size_header) - (sizeof(id) + size_header + 0x1000000) = &kvm_vcpu_stats_desc - 0x1000000 Otherwise, src ends up pointing at the wrong place. > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vcpu stats values */ > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; The same problem occurs here. There is a potential gap before data_offset that needs to be taken into account for src and len. Would it be possible to just ensure that there is no gap? maybe even remove data_offset and desc_offset and always place them adjacent, and have the descriptors right after the header. > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&vcpu->stat; > + src += pos - kvm_vcpu_stats_header.data_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + > + *offset = pos; > + return len; > +} > + > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > + size_t size, loff_t *offset) > +{ Consider moving the common code between kvm_vcpu_stats_read and this one into some function that takes pointers to header, desc, and data. Unless there is something vcpu or vm specific besides that. > + char id[KVM_STATS_ID_MAXLEN]; > + struct kvm *kvm = file->private_data; > + ssize_t copylen, len, remain = size; > + size_t size_header, size_desc, size_stats; > + loff_t pos = *offset; > + char __user *dest = user_buffer; > + void *src; > + > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > + size_header = sizeof(kvm_vm_stats_header); > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > + size_stats = sizeof(kvm->stat); > + > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > + len = min(len, remain); > + if (len <= 0) > + return 0; > + remain = len; > + > + /* Copy kvm vm stats header id string */ > + copylen = sizeof(id) - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)id + pos; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vm stats header */ > + copylen = sizeof(id) + size_header - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vm_stats_header; > + src += pos - sizeof(id); > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vm stats descriptors */ > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm_vm_stats_desc; > + src += pos - kvm_vm_stats_header.desc_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + /* Copy kvm vm stats values */ > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > + copylen = min(copylen, remain); > + if (copylen > 0) { > + src = (void *)&kvm->stat; > + src += pos - kvm_vm_stats_header.data_offset; > + if (copy_to_user(dest, src, copylen)) > + return -EFAULT; > + remain -= copylen; > + pos += copylen; > + dest += copylen; > + } > + > + *offset = pos; > + return len; > +} > + > -- > 2.31.1.751.gd2f1c929bd-goog > > _______________________________________________ > kvmarm mailing list > kvmarm@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Hi Ricardo, On Wed, May 19, 2021 at 11:21 PM Ricardo Koller <ricarkol@google.com> wrote: > > On Mon, May 17, 2021 at 02:53:12PM +0000, Jing Zhang wrote: > > Provides a file descriptor per VM to read VM stats info/data. > > Provides a file descriptor per vCPU to read vCPU stats info/data. > > > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > > --- > > arch/arm64/kvm/guest.c | 26 +++++ > > arch/mips/kvm/mips.c | 52 +++++++++ > > arch/powerpc/kvm/book3s.c | 52 +++++++++ > > arch/powerpc/kvm/booke.c | 45 ++++++++ > > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > > arch/x86/kvm/x86.c | 53 +++++++++ > > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > > include/uapi/linux/kvm.h | 50 +++++++++ > > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > > 9 files changed, 745 insertions(+) > > > > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > > + size_t size, loff_t *offset) > > +{ > > + char id[KVM_STATS_ID_MAXLEN]; > > + struct kvm_vcpu *vcpu = file->private_data; > > + ssize_t copylen, len, remain = size; > > + size_t size_header, size_desc, size_stats; > > + loff_t pos = *offset; > > + char __user *dest = user_buffer; > > + void *src; > > Nit. Better to do pointer arithmetic on a "char *". Note that gcc and > clang will do the expected thing. > > > + > > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > > + task_pid_nr(current), vcpu->vcpu_id); > > + size_header = sizeof(kvm_vcpu_stats_header); > > + size_desc = > > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > > + size_stats = sizeof(vcpu->stat); > > + > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > + len = min(len, remain); > > + if (len <= 0) > > + return 0; > > + remain = len; > > If 'desc_offset' is not right after the header, then the 'len' > calculation is missing the gap into account. For example, assuming there > is a gap of 0x1000000 between the header and the descriptors: > > desc_offset = sizeof(id) + size_header + 0x1000000 > > and the user calls the ioctl with enough space for the whole file, > including the gap: > > *offset = 0 > size = sizeof(id) + size_header + size_desc + size_stats + 0x1000000 > > then 'remain' gets the wrong size: > > remain = sizeof(id) + size_header + size_desc + size_stats > > and ... (more below) > > > + > > + /* Copy kvm vcpu stats header id string */ > > + copylen = sizeof(id) - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)id + pos; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vcpu stats header */ > > + copylen = sizeof(id) + size_header - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vcpu_stats_header; > > + src += pos - sizeof(id); > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vcpu stats descriptors */ > > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > > This would be the state at this point: > > pos = sizeof(id) + size_header > copylen = sizeof(id) + size_header + 0x1000000 + size_desc - (sizeof(id) + size_header) > = 0x1000000 + size_desc > remain = size_desc + size_stats > > > + copylen = min(copylen, remain); > > copylen = size_desc + size_stats > > which is not enough to copy the descriptors (and the data). > > > + if (copylen > 0) { > > + src = (void *)&kvm_vcpu_stats_desc; > > + src += pos - kvm_vcpu_stats_header.desc_offset; > > Moreover, src also needs to take the gap into account. > > src = &kvm_vcpu_stats_desc + (sizeof(id) + size_header) - (sizeof(id) + size_header + 0x1000000) > = &kvm_vcpu_stats_desc - 0x1000000 > > Otherwise, src ends up pointing at the wrong place. > > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vcpu stats values */ > > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > > The same problem occurs here. There is a potential gap before > data_offset that needs to be taken into account for src and len. > > Would it be possible to just ensure that there is no gap? maybe even > remove data_offset and desc_offset and always place them adjacent, and > have the descriptors right after the header. > I guess I didn't make it clear about the offset fields in the header block. We don't create any gap here. In this implementation, kernel knows that descriptor block is right after header block and data block is right after descriptor block. The reason we have offset fields for descriptor block and data block is for flexibility and future potential extension. e.g. we might add another block between header block and descriptor block in the future for some other metadata information. I think we are good here. > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&vcpu->stat; > > + src += pos - kvm_vcpu_stats_header.data_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + > > + *offset = pos; > > + return len; > > +} > > + > > > > > > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > > + size_t size, loff_t *offset) > > +{ > > Consider moving the common code between kvm_vcpu_stats_read and this one > into some function that takes pointers to header, desc, and data. Unless > there is something vcpu or vm specific besides that. > Will do that, thanks. > > + char id[KVM_STATS_ID_MAXLEN]; > > + struct kvm *kvm = file->private_data; > > + ssize_t copylen, len, remain = size; > > + size_t size_header, size_desc, size_stats; > > + loff_t pos = *offset; > > + char __user *dest = user_buffer; > > + void *src; > > + > > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > > + size_header = sizeof(kvm_vm_stats_header); > > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > > + size_stats = sizeof(kvm->stat); > > + > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > + len = min(len, remain); > > + if (len <= 0) > > + return 0; > > + remain = len; > > + > > + /* Copy kvm vm stats header id string */ > > + copylen = sizeof(id) - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)id + pos; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vm stats header */ > > + copylen = sizeof(id) + size_header - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vm_stats_header; > > + src += pos - sizeof(id); > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vm stats descriptors */ > > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm_vm_stats_desc; > > + src += pos - kvm_vm_stats_header.desc_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + /* Copy kvm vm stats values */ > > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > > + copylen = min(copylen, remain); > > + if (copylen > 0) { > > + src = (void *)&kvm->stat; > > + src += pos - kvm_vm_stats_header.data_offset; > > + if (copy_to_user(dest, src, copylen)) > > + return -EFAULT; > > + remain -= copylen; > > + pos += copylen; > > + dest += copylen; > > + } > > + > > + *offset = pos; > > + return len; > > +} > > + > > -- > > 2.31.1.751.gd2f1c929bd-goog > > > > _______________________________________________ > > kvmarm mailing list > > kvmarm@lists.cs.columbia.edu > > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
On Thu, May 20, 2021 at 12:37:59PM -0500, Jing Zhang wrote: > Hi Ricardo, > > On Wed, May 19, 2021 at 11:21 PM Ricardo Koller <ricarkol@google.com> wrote: > > > > On Mon, May 17, 2021 at 02:53:12PM +0000, Jing Zhang wrote: > > > Provides a file descriptor per VM to read VM stats info/data. > > > Provides a file descriptor per vCPU to read vCPU stats info/data. > > > > > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > > > --- > > > arch/arm64/kvm/guest.c | 26 +++++ > > > arch/mips/kvm/mips.c | 52 +++++++++ > > > arch/powerpc/kvm/book3s.c | 52 +++++++++ > > > arch/powerpc/kvm/booke.c | 45 ++++++++ > > > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > > > arch/x86/kvm/x86.c | 53 +++++++++ > > > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > > > include/uapi/linux/kvm.h | 50 +++++++++ > > > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > > > 9 files changed, 745 insertions(+) > > > > > > > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > > > + size_t size, loff_t *offset) > > > +{ > > > + char id[KVM_STATS_ID_MAXLEN]; > > > + struct kvm_vcpu *vcpu = file->private_data; > > > + ssize_t copylen, len, remain = size; > > > + size_t size_header, size_desc, size_stats; > > > + loff_t pos = *offset; > > > + char __user *dest = user_buffer; > > > + void *src; > > > > Nit. Better to do pointer arithmetic on a "char *". Note that gcc and > > clang will do the expected thing. > > > > > + > > > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > > > + task_pid_nr(current), vcpu->vcpu_id); > > > + size_header = sizeof(kvm_vcpu_stats_header); > > > + size_desc = > > > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > > > + size_stats = sizeof(vcpu->stat); > > > + > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > + len = min(len, remain); > > > + if (len <= 0) > > > + return 0; > > > + remain = len; > > > > If 'desc_offset' is not right after the header, then the 'len' > > calculation is missing the gap into account. For example, assuming there > > is a gap of 0x1000000 between the header and the descriptors: > > > > desc_offset = sizeof(id) + size_header + 0x1000000 > > > > and the user calls the ioctl with enough space for the whole file, > > including the gap: > > > > *offset = 0 > > size = sizeof(id) + size_header + size_desc + size_stats + 0x1000000 > > > > then 'remain' gets the wrong size: > > > > remain = sizeof(id) + size_header + size_desc + size_stats > > > > and ... (more below) > > > > > + > > > + /* Copy kvm vcpu stats header id string */ > > > + copylen = sizeof(id) - pos; > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)id + pos; > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + /* Copy kvm vcpu stats header */ > > > + copylen = sizeof(id) + size_header - pos; > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)&kvm_vcpu_stats_header; > > > + src += pos - sizeof(id); > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + /* Copy kvm vcpu stats descriptors */ > > > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > > > > This would be the state at this point: > > > > pos = sizeof(id) + size_header > > copylen = sizeof(id) + size_header + 0x1000000 + size_desc - (sizeof(id) + size_header) > > = 0x1000000 + size_desc > > remain = size_desc + size_stats > > > > > + copylen = min(copylen, remain); > > > > copylen = size_desc + size_stats > > > > which is not enough to copy the descriptors (and the data). > > > > > + if (copylen > 0) { > > > + src = (void *)&kvm_vcpu_stats_desc; > > > + src += pos - kvm_vcpu_stats_header.desc_offset; > > > > Moreover, src also needs to take the gap into account. > > > > src = &kvm_vcpu_stats_desc + (sizeof(id) + size_header) - (sizeof(id) + size_header + 0x1000000) > > = &kvm_vcpu_stats_desc - 0x1000000 > > > > Otherwise, src ends up pointing at the wrong place. > > > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + /* Copy kvm vcpu stats values */ > > > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > > > > The same problem occurs here. There is a potential gap before > > data_offset that needs to be taken into account for src and len. > > > > Would it be possible to just ensure that there is no gap? maybe even > > remove data_offset and desc_offset and always place them adjacent, and > > have the descriptors right after the header. > > > I guess I didn't make it clear about the offset fields in the header block. > We don't create any gap here. In this implementation, kernel knows that > descriptor block is right after header block and data block is right after > descriptor block. > The reason we have offset fields for descriptor block and data block is > for flexibility and future potential extension. e.g. we might add another > block between header block and descriptor block in the future for some > other metadata information. > I think we are good here. Hi Jing, I realize they are adjacent right now, as the function wouldn't work if they weren't. My comment was more about code maintenance, what happens if the layout changes. This function depends on an asumption about a layout defined somewhere else. For example, copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; makes an assumption about desc_offset being set to: .desc_offset = sizeof(struct kvm_stats_header), and if desc_offset is not exactly that, then the function doesn't explicitely fail and instead does unexpected things (probably undetected by tests). I think the solution is to just check the assumptions. Either an assert or just bail out with a warning: /* This function currently depends on the following layout. */ if (kvm_vm_stats_header.desc_offset != sizeof(struct kvm_stats_header) || kvm_vm_stats_header.data_offset != sizeof(struct kvm_stats_header) + sizeof(kvm_vm_stats_desc)) { warning(...); return 0; } > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)&vcpu->stat; > > > + src += pos - kvm_vcpu_stats_header.data_offset; > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + > > > + *offset = pos; > > > + return len; > > > +} > > > + > > > > > > > > > > > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > > > + size_t size, loff_t *offset) > > > +{ > > > > Consider moving the common code between kvm_vcpu_stats_read and this one > > into some function that takes pointers to header, desc, and data. Unless > > there is something vcpu or vm specific besides that. > > > Will do that, thanks. > > > + char id[KVM_STATS_ID_MAXLEN]; > > > + struct kvm *kvm = file->private_data; > > > + ssize_t copylen, len, remain = size; > > > + size_t size_header, size_desc, size_stats; > > > + loff_t pos = *offset; > > > + char __user *dest = user_buffer; > > > + void *src; > > > + > > > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > > > + size_header = sizeof(kvm_vm_stats_header); > > > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > > > + size_stats = sizeof(kvm->stat); > > > + > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > + len = min(len, remain); > > > + if (len <= 0) > > > + return 0; > > > + remain = len; > > > + > > > + /* Copy kvm vm stats header id string */ > > > + copylen = sizeof(id) - pos; > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)id + pos; > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + /* Copy kvm vm stats header */ > > > + copylen = sizeof(id) + size_header - pos; > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)&kvm_vm_stats_header; > > > + src += pos - sizeof(id); > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + /* Copy kvm vm stats descriptors */ > > > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)&kvm_vm_stats_desc; > > > + src += pos - kvm_vm_stats_header.desc_offset; > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + /* Copy kvm vm stats values */ > > > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > > > + copylen = min(copylen, remain); > > > + if (copylen > 0) { > > > + src = (void *)&kvm->stat; > > > + src += pos - kvm_vm_stats_header.data_offset; > > > + if (copy_to_user(dest, src, copylen)) > > > + return -EFAULT; > > > + remain -= copylen; > > > + pos += copylen; > > > + dest += copylen; > > > + } > > > + > > > + *offset = pos; > > > + return len; > > > +} > > > + > > > -- > > > 2.31.1.751.gd2f1c929bd-goog > > > > > > _______________________________________________ > > > kvmarm mailing list > > > kvmarm@lists.cs.columbia.edu > > > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Hi Ricardo, On Thu, May 20, 2021 at 1:58 PM Ricardo Koller <ricarkol@google.com> wrote: > > On Thu, May 20, 2021 at 12:37:59PM -0500, Jing Zhang wrote: > > Hi Ricardo, > > > > On Wed, May 19, 2021 at 11:21 PM Ricardo Koller <ricarkol@google.com> wrote: > > > > > > On Mon, May 17, 2021 at 02:53:12PM +0000, Jing Zhang wrote: > > > > Provides a file descriptor per VM to read VM stats info/data. > > > > Provides a file descriptor per vCPU to read vCPU stats info/data. > > > > > > > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > > > > --- > > > > arch/arm64/kvm/guest.c | 26 +++++ > > > > arch/mips/kvm/mips.c | 52 +++++++++ > > > > arch/powerpc/kvm/book3s.c | 52 +++++++++ > > > > arch/powerpc/kvm/booke.c | 45 ++++++++ > > > > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > > > > arch/x86/kvm/x86.c | 53 +++++++++ > > > > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > > > > include/uapi/linux/kvm.h | 50 +++++++++ > > > > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > > > > 9 files changed, 745 insertions(+) > > > > > > > > > > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > > > > + size_t size, loff_t *offset) > > > > +{ > > > > + char id[KVM_STATS_ID_MAXLEN]; > > > > + struct kvm_vcpu *vcpu = file->private_data; > > > > + ssize_t copylen, len, remain = size; > > > > + size_t size_header, size_desc, size_stats; > > > > + loff_t pos = *offset; > > > > + char __user *dest = user_buffer; > > > > + void *src; > > > > > > Nit. Better to do pointer arithmetic on a "char *". Note that gcc and > > > clang will do the expected thing. > > > > > > > + > > > > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > > > > + task_pid_nr(current), vcpu->vcpu_id); > > > > + size_header = sizeof(kvm_vcpu_stats_header); > > > > + size_desc = > > > > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > > > > + size_stats = sizeof(vcpu->stat); > > > > + > > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > > + len = min(len, remain); > > > > + if (len <= 0) > > > > + return 0; > > > > + remain = len; > > > > > > If 'desc_offset' is not right after the header, then the 'len' > > > calculation is missing the gap into account. For example, assuming there > > > is a gap of 0x1000000 between the header and the descriptors: > > > > > > desc_offset = sizeof(id) + size_header + 0x1000000 > > > > > > and the user calls the ioctl with enough space for the whole file, > > > including the gap: > > > > > > *offset = 0 > > > size = sizeof(id) + size_header + size_desc + size_stats + 0x1000000 > > > > > > then 'remain' gets the wrong size: > > > > > > remain = sizeof(id) + size_header + size_desc + size_stats > > > > > > and ... (more below) > > > > > > > + > > > > + /* Copy kvm vcpu stats header id string */ > > > > + copylen = sizeof(id) - pos; > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)id + pos; > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + /* Copy kvm vcpu stats header */ > > > > + copylen = sizeof(id) + size_header - pos; > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)&kvm_vcpu_stats_header; > > > > + src += pos - sizeof(id); > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + /* Copy kvm vcpu stats descriptors */ > > > > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > > > > > > This would be the state at this point: > > > > > > pos = sizeof(id) + size_header > > > copylen = sizeof(id) + size_header + 0x1000000 + size_desc - (sizeof(id) + size_header) > > > = 0x1000000 + size_desc > > > remain = size_desc + size_stats > > > > > > > + copylen = min(copylen, remain); > > > > > > copylen = size_desc + size_stats > > > > > > which is not enough to copy the descriptors (and the data). > > > > > > > + if (copylen > 0) { > > > > + src = (void *)&kvm_vcpu_stats_desc; > > > > + src += pos - kvm_vcpu_stats_header.desc_offset; > > > > > > Moreover, src also needs to take the gap into account. > > > > > > src = &kvm_vcpu_stats_desc + (sizeof(id) + size_header) - (sizeof(id) + size_header + 0x1000000) > > > = &kvm_vcpu_stats_desc - 0x1000000 > > > > > > Otherwise, src ends up pointing at the wrong place. > > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + /* Copy kvm vcpu stats values */ > > > > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > > > > > > The same problem occurs here. There is a potential gap before > > > data_offset that needs to be taken into account for src and len. > > > > > > Would it be possible to just ensure that there is no gap? maybe even > > > remove data_offset and desc_offset and always place them adjacent, and > > > have the descriptors right after the header. > > > > > I guess I didn't make it clear about the offset fields in the header block. > > We don't create any gap here. In this implementation, kernel knows that > > descriptor block is right after header block and data block is right after > > descriptor block. > > The reason we have offset fields for descriptor block and data block is > > for flexibility and future potential extension. e.g. we might add another > > block between header block and descriptor block in the future for some > > other metadata information. > > I think we are good here. > > Hi Jing, > > I realize they are adjacent right now, as the function wouldn't work if > they weren't. My comment was more about code maintenance, what happens > if the layout changes. This function depends on an asumption about a > layout defined somewhere else. For example, > > copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > makes an assumption about desc_offset being set to: > > .desc_offset = sizeof(struct kvm_stats_header), > > and if desc_offset is not exactly that, then the function doesn't > explicitely fail and instead does unexpected things (probably undetected > by tests). > > I think the solution is to just check the assumptions. Either an assert > or just bail out with a warning: > > /* This function currently depends on the following layout. */ > if (kvm_vm_stats_header.desc_offset != sizeof(struct kvm_stats_header) || > kvm_vm_stats_header.data_offset != sizeof(struct kvm_stats_header) + > sizeof(kvm_vm_stats_desc)) { > warning(...); > return 0; > } > I understand your concern. But whenever layout changes, the read function needs to be updated anyway. The read function is actually the place to cook the data layout of the anonymous file. If the vm/vcpu stats header has an incorrect offset value that is defined in the read function, the test will complain about wrong stats descriptor field values usually. Anyway, I will add more sanity tests in the selftest to cover the potential risks. Thanks. > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)&vcpu->stat; > > > > + src += pos - kvm_vcpu_stats_header.data_offset; > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + > > > > + *offset = pos; > > > > + return len; > > > > +} > > > > + > > > > > > > > > > > > > > > > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > > > > + size_t size, loff_t *offset) > > > > +{ > > > > > > Consider moving the common code between kvm_vcpu_stats_read and this one > > > into some function that takes pointers to header, desc, and data. Unless > > > there is something vcpu or vm specific besides that. > > > > > Will do that, thanks. > > > > + char id[KVM_STATS_ID_MAXLEN]; > > > > + struct kvm *kvm = file->private_data; > > > > + ssize_t copylen, len, remain = size; > > > > + size_t size_header, size_desc, size_stats; > > > > + loff_t pos = *offset; > > > > + char __user *dest = user_buffer; > > > > + void *src; > > > > + > > > > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > > > > + size_header = sizeof(kvm_vm_stats_header); > > > > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > > > > + size_stats = sizeof(kvm->stat); > > > > + > > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > > + len = min(len, remain); > > > > + if (len <= 0) > > > > + return 0; > > > > + remain = len; > > > > + > > > > + /* Copy kvm vm stats header id string */ > > > > + copylen = sizeof(id) - pos; > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)id + pos; > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + /* Copy kvm vm stats header */ > > > > + copylen = sizeof(id) + size_header - pos; > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)&kvm_vm_stats_header; > > > > + src += pos - sizeof(id); > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + /* Copy kvm vm stats descriptors */ > > > > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)&kvm_vm_stats_desc; > > > > + src += pos - kvm_vm_stats_header.desc_offset; > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + /* Copy kvm vm stats values */ > > > > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > > > > + copylen = min(copylen, remain); > > > > + if (copylen > 0) { > > > > + src = (void *)&kvm->stat; > > > > + src += pos - kvm_vm_stats_header.data_offset; > > > > + if (copy_to_user(dest, src, copylen)) > > > > + return -EFAULT; > > > > + remain -= copylen; > > > > + pos += copylen; > > > > + dest += copylen; > > > > + } > > > > + > > > > + *offset = pos; > > > > + return len; > > > > +} > > > > + > > > > -- > > > > 2.31.1.751.gd2f1c929bd-goog > > > > > > > > _______________________________________________ > > > > kvmarm mailing list > > > > kvmarm@lists.cs.columbia.edu > > > > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm Jing
On Thu, May 20, 2021 at 02:46:41PM -0500, Jing Zhang wrote: > Hi Ricardo, > > On Thu, May 20, 2021 at 1:58 PM Ricardo Koller <ricarkol@google.com> wrote: > > > > On Thu, May 20, 2021 at 12:37:59PM -0500, Jing Zhang wrote: > > > Hi Ricardo, > > > > > > On Wed, May 19, 2021 at 11:21 PM Ricardo Koller <ricarkol@google.com> wrote: > > > > > > > > On Mon, May 17, 2021 at 02:53:12PM +0000, Jing Zhang wrote: > > > > > Provides a file descriptor per VM to read VM stats info/data. > > > > > Provides a file descriptor per vCPU to read vCPU stats info/data. > > > > > > > > > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > > > > > --- > > > > > arch/arm64/kvm/guest.c | 26 +++++ > > > > > arch/mips/kvm/mips.c | 52 +++++++++ > > > > > arch/powerpc/kvm/book3s.c | 52 +++++++++ > > > > > arch/powerpc/kvm/booke.c | 45 ++++++++ > > > > > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > > > > > arch/x86/kvm/x86.c | 53 +++++++++ > > > > > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > > > > > include/uapi/linux/kvm.h | 50 +++++++++ > > > > > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > > > > > 9 files changed, 745 insertions(+) > > > > > > > > > > > > > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > > > > > + size_t size, loff_t *offset) > > > > > +{ > > > > > + char id[KVM_STATS_ID_MAXLEN]; > > > > > + struct kvm_vcpu *vcpu = file->private_data; > > > > > + ssize_t copylen, len, remain = size; > > > > > + size_t size_header, size_desc, size_stats; > > > > > + loff_t pos = *offset; > > > > > + char __user *dest = user_buffer; > > > > > + void *src; > > > > > > > > Nit. Better to do pointer arithmetic on a "char *". Note that gcc and > > > > clang will do the expected thing. > > > > > > > > > + > > > > > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > > > > > + task_pid_nr(current), vcpu->vcpu_id); > > > > > + size_header = sizeof(kvm_vcpu_stats_header); > > > > > + size_desc = > > > > > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > > > > > + size_stats = sizeof(vcpu->stat); > > > > > + > > > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > > > + len = min(len, remain); > > > > > + if (len <= 0) > > > > > + return 0; > > > > > + remain = len; > > > > > > > > If 'desc_offset' is not right after the header, then the 'len' > > > > calculation is missing the gap into account. For example, assuming there > > > > is a gap of 0x1000000 between the header and the descriptors: > > > > > > > > desc_offset = sizeof(id) + size_header + 0x1000000 > > > > > > > > and the user calls the ioctl with enough space for the whole file, > > > > including the gap: > > > > > > > > *offset = 0 > > > > size = sizeof(id) + size_header + size_desc + size_stats + 0x1000000 > > > > > > > > then 'remain' gets the wrong size: > > > > > > > > remain = sizeof(id) + size_header + size_desc + size_stats > > > > > > > > and ... (more below) > > > > > > > > > + > > > > > + /* Copy kvm vcpu stats header id string */ > > > > > + copylen = sizeof(id) - pos; > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)id + pos; > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + /* Copy kvm vcpu stats header */ > > > > > + copylen = sizeof(id) + size_header - pos; > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)&kvm_vcpu_stats_header; > > > > > + src += pos - sizeof(id); > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + /* Copy kvm vcpu stats descriptors */ > > > > > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > > > > > > > > This would be the state at this point: > > > > > > > > pos = sizeof(id) + size_header > > > > copylen = sizeof(id) + size_header + 0x1000000 + size_desc - (sizeof(id) + size_header) > > > > = 0x1000000 + size_desc > > > > remain = size_desc + size_stats > > > > > > > > > + copylen = min(copylen, remain); > > > > > > > > copylen = size_desc + size_stats > > > > > > > > which is not enough to copy the descriptors (and the data). > > > > > > > > > + if (copylen > 0) { > > > > > + src = (void *)&kvm_vcpu_stats_desc; > > > > > + src += pos - kvm_vcpu_stats_header.desc_offset; > > > > > > > > Moreover, src also needs to take the gap into account. > > > > > > > > src = &kvm_vcpu_stats_desc + (sizeof(id) + size_header) - (sizeof(id) + size_header + 0x1000000) > > > > = &kvm_vcpu_stats_desc - 0x1000000 > > > > > > > > Otherwise, src ends up pointing at the wrong place. > > > > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + /* Copy kvm vcpu stats values */ > > > > > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > > > > > > > > The same problem occurs here. There is a potential gap before > > > > data_offset that needs to be taken into account for src and len. > > > > > > > > Would it be possible to just ensure that there is no gap? maybe even > > > > remove data_offset and desc_offset and always place them adjacent, and > > > > have the descriptors right after the header. > > > > > > > I guess I didn't make it clear about the offset fields in the header block. > > > We don't create any gap here. In this implementation, kernel knows that > > > descriptor block is right after header block and data block is right after > > > descriptor block. > > > The reason we have offset fields for descriptor block and data block is > > > for flexibility and future potential extension. e.g. we might add another > > > block between header block and descriptor block in the future for some > > > other metadata information. > > > I think we are good here. > > > > Hi Jing, > > > > I realize they are adjacent right now, as the function wouldn't work if > > they weren't. My comment was more about code maintenance, what happens > > if the layout changes. This function depends on an asumption about a > > layout defined somewhere else. For example, > > > > copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > > > makes an assumption about desc_offset being set to: > > > > .desc_offset = sizeof(struct kvm_stats_header), > > > > and if desc_offset is not exactly that, then the function doesn't > > explicitely fail and instead does unexpected things (probably undetected > > by tests). > > > > I think the solution is to just check the assumptions. Either an assert > > or just bail out with a warning: > > > > /* This function currently depends on the following layout. */ > > if (kvm_vm_stats_header.desc_offset != sizeof(struct kvm_stats_header) || > > kvm_vm_stats_header.data_offset != sizeof(struct kvm_stats_header) + > > sizeof(kvm_vm_stats_desc)) { > > warning(...); > > return 0; > > } > > > I understand your concern. But whenever layout changes, the read function needs > to be updated anyway. The read function is actually the place to cook > the data layout > of the anonymous file. Could it be a good idea for header.data_offset and header.desc_offset to be set here (in the function)? so the function has full control of the file layout. > If the vm/vcpu stats header has an incorrect > offset value that is > defined in the read function, the test will complain about wrong stats > descriptor field > values usually. > Anyway, I will add more sanity tests in the selftest to cover the > potential risks. > Thanks. > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)&vcpu->stat; > > > > > + src += pos - kvm_vcpu_stats_header.data_offset; > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + > > > > > + *offset = pos; > > > > > + return len; > > > > > +} > > > > > + > > > > > > > > > > > > > > > > > > > > > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > > > > > + size_t size, loff_t *offset) > > > > > +{ > > > > > > > > Consider moving the common code between kvm_vcpu_stats_read and this one > > > > into some function that takes pointers to header, desc, and data. Unless > > > > there is something vcpu or vm specific besides that. > > > > > > > Will do that, thanks. > > > > > + char id[KVM_STATS_ID_MAXLEN]; > > > > > + struct kvm *kvm = file->private_data; > > > > > + ssize_t copylen, len, remain = size; > > > > > + size_t size_header, size_desc, size_stats; > > > > > + loff_t pos = *offset; > > > > > + char __user *dest = user_buffer; > > > > > + void *src; > > > > > + > > > > > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > > > > > + size_header = sizeof(kvm_vm_stats_header); > > > > > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > > > > > + size_stats = sizeof(kvm->stat); > > > > > + > > > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > > > + len = min(len, remain); > > > > > + if (len <= 0) > > > > > + return 0; > > > > > + remain = len; > > > > > + > > > > > + /* Copy kvm vm stats header id string */ > > > > > + copylen = sizeof(id) - pos; > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)id + pos; > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + /* Copy kvm vm stats header */ > > > > > + copylen = sizeof(id) + size_header - pos; > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)&kvm_vm_stats_header; > > > > > + src += pos - sizeof(id); > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + /* Copy kvm vm stats descriptors */ > > > > > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)&kvm_vm_stats_desc; > > > > > + src += pos - kvm_vm_stats_header.desc_offset; > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + /* Copy kvm vm stats values */ > > > > > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > > > > > + copylen = min(copylen, remain); > > > > > + if (copylen > 0) { > > > > > + src = (void *)&kvm->stat; > > > > > + src += pos - kvm_vm_stats_header.data_offset; > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > + return -EFAULT; > > > > > + remain -= copylen; > > > > > + pos += copylen; > > > > > + dest += copylen; > > > > > + } > > > > > + > > > > > + *offset = pos; > > > > > + return len; > > > > > +} > > > > > + > > > > > -- > > > > > 2.31.1.751.gd2f1c929bd-goog > > > > > > > > > > _______________________________________________ > > > > > kvmarm mailing list > > > > > kvmarm@lists.cs.columbia.edu > > > > > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > > Jing
On Thu, May 20, 2021 at 3:51 PM Ricardo Koller <ricarkol@google.com> wrote: > > On Thu, May 20, 2021 at 02:46:41PM -0500, Jing Zhang wrote: > > Hi Ricardo, > > > > On Thu, May 20, 2021 at 1:58 PM Ricardo Koller <ricarkol@google.com> wrote: > > > > > > On Thu, May 20, 2021 at 12:37:59PM -0500, Jing Zhang wrote: > > > > Hi Ricardo, > > > > > > > > On Wed, May 19, 2021 at 11:21 PM Ricardo Koller <ricarkol@google.com> wrote: > > > > > > > > > > On Mon, May 17, 2021 at 02:53:12PM +0000, Jing Zhang wrote: > > > > > > Provides a file descriptor per VM to read VM stats info/data. > > > > > > Provides a file descriptor per vCPU to read vCPU stats info/data. > > > > > > > > > > > > Signed-off-by: Jing Zhang <jingzhangos@google.com> > > > > > > --- > > > > > > arch/arm64/kvm/guest.c | 26 +++++ > > > > > > arch/mips/kvm/mips.c | 52 +++++++++ > > > > > > arch/powerpc/kvm/book3s.c | 52 +++++++++ > > > > > > arch/powerpc/kvm/booke.c | 45 ++++++++ > > > > > > arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ > > > > > > arch/x86/kvm/x86.c | 53 +++++++++ > > > > > > include/linux/kvm_host.h | 127 ++++++++++++++++++++++ > > > > > > include/uapi/linux/kvm.h | 50 +++++++++ > > > > > > virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ > > > > > > 9 files changed, 745 insertions(+) > > > > > > > > > > > > > > > > > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, > > > > > > + size_t size, loff_t *offset) > > > > > > +{ > > > > > > + char id[KVM_STATS_ID_MAXLEN]; > > > > > > + struct kvm_vcpu *vcpu = file->private_data; > > > > > > + ssize_t copylen, len, remain = size; > > > > > > + size_t size_header, size_desc, size_stats; > > > > > > + loff_t pos = *offset; > > > > > > + char __user *dest = user_buffer; > > > > > > + void *src; > > > > > > > > > > Nit. Better to do pointer arithmetic on a "char *". Note that gcc and > > > > > clang will do the expected thing. > > > > > > > > > > > + > > > > > > + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", > > > > > > + task_pid_nr(current), vcpu->vcpu_id); > > > > > > + size_header = sizeof(kvm_vcpu_stats_header); > > > > > > + size_desc = > > > > > > + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); > > > > > > + size_stats = sizeof(vcpu->stat); > > > > > > + > > > > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > > > > + len = min(len, remain); > > > > > > + if (len <= 0) > > > > > > + return 0; > > > > > > + remain = len; > > > > > > > > > > If 'desc_offset' is not right after the header, then the 'len' > > > > > calculation is missing the gap into account. For example, assuming there > > > > > is a gap of 0x1000000 between the header and the descriptors: > > > > > > > > > > desc_offset = sizeof(id) + size_header + 0x1000000 > > > > > > > > > > and the user calls the ioctl with enough space for the whole file, > > > > > including the gap: > > > > > > > > > > *offset = 0 > > > > > size = sizeof(id) + size_header + size_desc + size_stats + 0x1000000 > > > > > > > > > > then 'remain' gets the wrong size: > > > > > > > > > > remain = sizeof(id) + size_header + size_desc + size_stats > > > > > > > > > > and ... (more below) > > > > > > > > > > > + > > > > > > + /* Copy kvm vcpu stats header id string */ > > > > > > + copylen = sizeof(id) - pos; > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)id + pos; > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + /* Copy kvm vcpu stats header */ > > > > > > + copylen = sizeof(id) + size_header - pos; > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)&kvm_vcpu_stats_header; > > > > > > + src += pos - sizeof(id); > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + /* Copy kvm vcpu stats descriptors */ > > > > > > + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; > > > > > > > > > > This would be the state at this point: > > > > > > > > > > pos = sizeof(id) + size_header > > > > > copylen = sizeof(id) + size_header + 0x1000000 + size_desc - (sizeof(id) + size_header) > > > > > = 0x1000000 + size_desc > > > > > remain = size_desc + size_stats > > > > > > > > > > > + copylen = min(copylen, remain); > > > > > > > > > > copylen = size_desc + size_stats > > > > > > > > > > which is not enough to copy the descriptors (and the data). > > > > > > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)&kvm_vcpu_stats_desc; > > > > > > + src += pos - kvm_vcpu_stats_header.desc_offset; > > > > > > > > > > Moreover, src also needs to take the gap into account. > > > > > > > > > > src = &kvm_vcpu_stats_desc + (sizeof(id) + size_header) - (sizeof(id) + size_header + 0x1000000) > > > > > = &kvm_vcpu_stats_desc - 0x1000000 > > > > > > > > > > Otherwise, src ends up pointing at the wrong place. > > > > > > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + /* Copy kvm vcpu stats values */ > > > > > > + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; > > > > > > > > > > The same problem occurs here. There is a potential gap before > > > > > data_offset that needs to be taken into account for src and len. > > > > > > > > > > Would it be possible to just ensure that there is no gap? maybe even > > > > > remove data_offset and desc_offset and always place them adjacent, and > > > > > have the descriptors right after the header. > > > > > > > > > I guess I didn't make it clear about the offset fields in the header block. > > > > We don't create any gap here. In this implementation, kernel knows that > > > > descriptor block is right after header block and data block is right after > > > > descriptor block. > > > > The reason we have offset fields for descriptor block and data block is > > > > for flexibility and future potential extension. e.g. we might add another > > > > block between header block and descriptor block in the future for some > > > > other metadata information. > > > > I think we are good here. > > > > > > Hi Jing, > > > > > > I realize they are adjacent right now, as the function wouldn't work if > > > they weren't. My comment was more about code maintenance, what happens > > > if the layout changes. This function depends on an asumption about a > > > layout defined somewhere else. For example, > > > > > > copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > > > > > makes an assumption about desc_offset being set to: > > > > > > .desc_offset = sizeof(struct kvm_stats_header), > > > > > > and if desc_offset is not exactly that, then the function doesn't > > > explicitely fail and instead does unexpected things (probably undetected > > > by tests). > > > > > > I think the solution is to just check the assumptions. Either an assert > > > or just bail out with a warning: > > > > > > /* This function currently depends on the following layout. */ > > > if (kvm_vm_stats_header.desc_offset != sizeof(struct kvm_stats_header) || > > > kvm_vm_stats_header.data_offset != sizeof(struct kvm_stats_header) + > > > sizeof(kvm_vm_stats_desc)) { > > > warning(...); > > > return 0; > > > } > > > > > I understand your concern. But whenever layout changes, the read function needs > > to be updated anyway. The read function is actually the place to cook > > the data layout > > of the anonymous file. > > Could it be a good idea for header.data_offset and header.desc_offset to > be set here (in the function)? so the function has full control of the > file layout. > It is hard to do that since all those values are architecture dependent. > > If the vm/vcpu stats header has an incorrect > > offset value that is > > defined in the read function, the test will complain about wrong stats > > descriptor field > > values usually. > > Anyway, I will add more sanity tests in the selftest to cover the > > potential risks. > > Thanks. > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)&vcpu->stat; > > > > > > + src += pos - kvm_vcpu_stats_header.data_offset; > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + > > > > > > + *offset = pos; > > > > > > + return len; > > > > > > +} > > > > > > + > > > > > > > > > > > > > > > > > > > > > > > > > > > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, > > > > > > + size_t size, loff_t *offset) > > > > > > +{ > > > > > > > > > > Consider moving the common code between kvm_vcpu_stats_read and this one > > > > > into some function that takes pointers to header, desc, and data. Unless > > > > > there is something vcpu or vm specific besides that. > > > > > > > > > Will do that, thanks. > > > > > > + char id[KVM_STATS_ID_MAXLEN]; > > > > > > + struct kvm *kvm = file->private_data; > > > > > > + ssize_t copylen, len, remain = size; > > > > > > + size_t size_header, size_desc, size_stats; > > > > > > + loff_t pos = *offset; > > > > > > + char __user *dest = user_buffer; > > > > > > + void *src; > > > > > > + > > > > > > + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); > > > > > > + size_header = sizeof(kvm_vm_stats_header); > > > > > > + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); > > > > > > + size_stats = sizeof(kvm->stat); > > > > > > + > > > > > > + len = sizeof(id) + size_header + size_desc + size_stats - pos; > > > > > > + len = min(len, remain); > > > > > > + if (len <= 0) > > > > > > + return 0; > > > > > > + remain = len; > > > > > > + > > > > > > + /* Copy kvm vm stats header id string */ > > > > > > + copylen = sizeof(id) - pos; > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)id + pos; > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + /* Copy kvm vm stats header */ > > > > > > + copylen = sizeof(id) + size_header - pos; > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)&kvm_vm_stats_header; > > > > > > + src += pos - sizeof(id); > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + /* Copy kvm vm stats descriptors */ > > > > > > + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)&kvm_vm_stats_desc; > > > > > > + src += pos - kvm_vm_stats_header.desc_offset; > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + /* Copy kvm vm stats values */ > > > > > > + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; > > > > > > + copylen = min(copylen, remain); > > > > > > + if (copylen > 0) { > > > > > > + src = (void *)&kvm->stat; > > > > > > + src += pos - kvm_vm_stats_header.data_offset; > > > > > > + if (copy_to_user(dest, src, copylen)) > > > > > > + return -EFAULT; > > > > > > + remain -= copylen; > > > > > > + pos += copylen; > > > > > > + dest += copylen; > > > > > > + } > > > > > > + > > > > > > + *offset = pos; > > > > > > + return len; > > > > > > +} > > > > > > + > > > > > > -- > > > > > > 2.31.1.751.gd2f1c929bd-goog > > > > > > > > > > > > _______________________________________________ > > > > > > kvmarm mailing list > > > > > > kvmarm@lists.cs.columbia.edu > > > > > > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > > > > Jing
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 0e41331b0911..1cc1d83630ac 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -28,6 +28,32 @@ #include "trace.h" +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); + +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("hvc_exit_stat"), + STATS_DESC_COUNTER("wfe_exit_stat"), + STATS_DESC_COUNTER("wfi_exit_stat"), + STATS_DESC_COUNTER("mmio_exit_user"), + STATS_DESC_COUNTER("mmio_exit_kernel"), + STATS_DESC_COUNTER("exits")); + +struct _kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vcpu_stats_desc), +}; + struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT_COM("halt_successful_poll", halt_successful_poll), VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@ #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); + +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"), + STATS_DESC_COUNTER("cache_exits"), + STATS_DESC_COUNTER("signal_exits"), + STATS_DESC_COUNTER("int_exits"), + STATS_DESC_COUNTER("cop_unusable_exits"), + STATS_DESC_COUNTER("tlbmod_exits"), + STATS_DESC_COUNTER("tlbmiss_ld_exits"), + STATS_DESC_COUNTER("tlbmiss_st_exits"), + STATS_DESC_COUNTER("addrerr_st_exits"), + STATS_DESC_COUNTER("addrerr_ld_exits"), + STATS_DESC_COUNTER("syscall_exits"), + STATS_DESC_COUNTER("resvd_inst_exits"), + STATS_DESC_COUNTER("break_inst_exits"), + STATS_DESC_COUNTER("trap_inst_exits"), + STATS_DESC_COUNTER("msa_fpe_exits"), + STATS_DESC_COUNTER("fpe_exits"), + STATS_DESC_COUNTER("msa_disabled_exits"), + STATS_DESC_COUNTER("flush_dcache_exits"), +#ifdef CONFIG_KVM_MIPS_VZ + STATS_DESC_COUNTER("vz_gpsi_exits"), + STATS_DESC_COUNTER("vz_gsfc_exits"), + STATS_DESC_COUNTER("vz_hc_exits"), + STATS_DESC_COUNTER("vz_grr_exits"), + STATS_DESC_COUNTER("vz_gva_exits"), + STATS_DESC_COUNTER("vz_ghfc_exits"), + STATS_DESC_COUNTER("vz_gpa_exits"), + STATS_DESC_COUNTER("vz_resvd_exits"), +#ifdef CONFIG_CPU_LOONGSON64 + STATS_DESC_COUNTER("vz_cpucfg_exits"), +#endif +#endif + ); + +struct _kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vcpu_stats_desc), +}; + struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("wait", wait_exits), VCPU_STAT("cache", cache_exits), diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index bd3a10e1fdaf..5e8ee0d39ef9 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -38,6 +38,58 @@ /* #define EXIT_DEBUG */ +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( + STATS_DESC_ICOUNTER("num_2M_pages"), + STATS_DESC_ICOUNTER("num_1G_pages")); + +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("sum_exits"), + STATS_DESC_COUNTER("mmio_exits"), + STATS_DESC_COUNTER("signal_exits"), + STATS_DESC_COUNTER("light_exits"), + STATS_DESC_COUNTER("itlb_real_miss_exits"), + STATS_DESC_COUNTER("itlb_virt_miss_exits"), + STATS_DESC_COUNTER("dtlb_real_miss_exits"), + STATS_DESC_COUNTER("dtlb_virt_miss_exits"), + STATS_DESC_COUNTER("syscall_exits"), + STATS_DESC_COUNTER("isi_exits"), + STATS_DESC_COUNTER("dsi_exits"), + STATS_DESC_COUNTER("emulated_inst_exits"), + STATS_DESC_COUNTER("dec_exits"), + STATS_DESC_COUNTER("ext_intr_exits"), + STATS_DESC_TIME_NSEC("halt_wait_ns"), + STATS_DESC_COUNTER("halt_successful_wait"), + STATS_DESC_COUNTER("dbell_exits"), + STATS_DESC_COUNTER("gdbell_exits"), + STATS_DESC_COUNTER("ld"), + STATS_DESC_COUNTER("st"), + STATS_DESC_COUNTER("pf_storage"), + STATS_DESC_COUNTER("pf_instruc"), + STATS_DESC_COUNTER("sp_storage"), + STATS_DESC_COUNTER("sp_instruc"), + STATS_DESC_COUNTER("queue_intr"), + STATS_DESC_COUNTER("ld_slow"), + STATS_DESC_COUNTER("st_slow"), + STATS_DESC_COUNTER("pthru_all"), + STATS_DESC_COUNTER("pthru_host"), + STATS_DESC_COUNTER("pthru_bad_aff")); + +struct _kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vcpu_stats_desc), +}; + struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("exits", sum_exits), VCPU_STAT("mmio", mmio_exits), diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 07fdd7a1254a..86d221e9193e 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -36,6 +36,51 @@ unsigned long kvmppc_booke_handlers; +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( + STATS_DESC_ICOUNTER("num_2M_pages"), + STATS_DESC_ICOUNTER("num_1G_pages")); + +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("sum_exits"), + STATS_DESC_COUNTER("mmio_exits"), + STATS_DESC_COUNTER("signal_exits"), + STATS_DESC_COUNTER("light_exits"), + STATS_DESC_COUNTER("itlb_real_miss_exits"), + STATS_DESC_COUNTER("itlb_virt_miss_exits"), + STATS_DESC_COUNTER("dtlb_real_miss_exits"), + STATS_DESC_COUNTER("dtlb_virt_miss_exits"), + STATS_DESC_COUNTER("syscall_exits"), + STATS_DESC_COUNTER("isi_exits"), + STATS_DESC_COUNTER("dsi_exits"), + STATS_DESC_COUNTER("emulated_inst_exits"), + STATS_DESC_COUNTER("dec_exits"), + STATS_DESC_COUNTER("ext_intr_exits"), + STATS_DESC_TIME_NSEC("halt_wait_ns"), + STATS_DESC_COUNTER("halt_successful_wait"), + STATS_DESC_COUNTER("dbell_exits"), + STATS_DESC_COUNTER("gdbell_exits"), + STATS_DESC_COUNTER("ld"), + STATS_DESC_COUNTER("st"), + STATS_DESC_COUNTER("pthru_all"), + STATS_DESC_COUNTER("pthru_host"), + STATS_DESC_COUNTER("pthru_bad_aff")); + +struct _kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vcpu_stats_desc), +}; + struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("mmio", mmio_exits), VCPU_STAT("sig", signal_exits), diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index d6bf3372bb10..003feee79fce 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -58,6 +58,123 @@ #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ (KVM_MAX_VCPUS + LOCAL_IRQS)) +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( + STATS_DESC_COUNTER("inject_io"), + STATS_DESC_COUNTER("inject_float_mchk"), + STATS_DESC_COUNTER("inject_pfault_done"), + STATS_DESC_COUNTER("inject_service_signal"), + STATS_DESC_COUNTER("inject_virtio")); + +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("exit_userspace"), + STATS_DESC_COUNTER("exit_null"), + STATS_DESC_COUNTER("exit_external_request"), + STATS_DESC_COUNTER("exit_io_request"), + STATS_DESC_COUNTER("exit_external_interrupt"), + STATS_DESC_COUNTER("exit_stop_request"), + STATS_DESC_COUNTER("exit_validity"), + STATS_DESC_COUNTER("exit_instruction"), + STATS_DESC_COUNTER("exit_pei"), + STATS_DESC_COUNTER("halt_no_poll_steal"), + STATS_DESC_COUNTER("instruction_lctl"), + STATS_DESC_COUNTER("instruction_lctlg"), + STATS_DESC_COUNTER("instruction_stctl"), + STATS_DESC_COUNTER("instruction_stctg"), + STATS_DESC_COUNTER("exit_program_interruption"), + STATS_DESC_COUNTER("exit_instr_and_program"), + STATS_DESC_COUNTER("exit_operation_exception"), + STATS_DESC_COUNTER("deliver_ckc"), + STATS_DESC_COUNTER("deliver_cputm"), + STATS_DESC_COUNTER("deliver_external_call"), + STATS_DESC_COUNTER("deliver_emergency_signal"), + STATS_DESC_COUNTER("deliver_service_signal"), + STATS_DESC_COUNTER("deliver_virtio"), + STATS_DESC_COUNTER("deliver_stop_signal"), + STATS_DESC_COUNTER("deliver_prefix_signal"), + STATS_DESC_COUNTER("deliver_restart_signal"), + STATS_DESC_COUNTER("deliver_program"), + STATS_DESC_COUNTER("deliver_io"), + STATS_DESC_COUNTER("deliver_machine_check"), + STATS_DESC_COUNTER("exit_wait_state"), + STATS_DESC_COUNTER("inject_ckc"), + STATS_DESC_COUNTER("inject_cputm"), + STATS_DESC_COUNTER("inject_external_call"), + STATS_DESC_COUNTER("inject_emergency_signal"), + STATS_DESC_COUNTER("inject_mchk"), + STATS_DESC_COUNTER("inject_pfault_init"), + STATS_DESC_COUNTER("inject_program"), + STATS_DESC_COUNTER("inject_restart"), + STATS_DESC_COUNTER("inject_set_prefix"), + STATS_DESC_COUNTER("inject_stop_signal"), + STATS_DESC_COUNTER("instruction_epsw"), + STATS_DESC_COUNTER("instruction_gs"), + STATS_DESC_COUNTER("instruction_io_other"), + STATS_DESC_COUNTER("instruction_lpsw"), + STATS_DESC_COUNTER("instruction_lpswe"), + STATS_DESC_COUNTER("instruction_pfmf"), + STATS_DESC_COUNTER("instruction_ptff"), + STATS_DESC_COUNTER("instruction_sck"), + STATS_DESC_COUNTER("instruction_sckpf"), + STATS_DESC_COUNTER("instruction_stidp"), + STATS_DESC_COUNTER("instruction_spx"), + STATS_DESC_COUNTER("instruction_stpx"), + STATS_DESC_COUNTER("instruction_stap"), + STATS_DESC_COUNTER("instruction_iske"), + STATS_DESC_COUNTER("instruction_ri"), + STATS_DESC_COUNTER("instruction_rrbe"), + STATS_DESC_COUNTER("instruction_sske"), + STATS_DESC_COUNTER("instruction_ipte_interlock"), + STATS_DESC_COUNTER("instruction_stsi"), + STATS_DESC_COUNTER("instruction_stfl"), + STATS_DESC_COUNTER("instruction_tb"), + STATS_DESC_COUNTER("instruction_tpi"), + STATS_DESC_COUNTER("instruction_tprot"), + STATS_DESC_COUNTER("instruction_tsch"), + STATS_DESC_COUNTER("instruction_sie"), + STATS_DESC_COUNTER("instruction_essa"), + STATS_DESC_COUNTER("instruction_sthyi"), + STATS_DESC_COUNTER("instruction_sigp_sense"), + STATS_DESC_COUNTER("instruction_sigp_sense_running"), + STATS_DESC_COUNTER("instruction_sigp_external_call"), + STATS_DESC_COUNTER("instruction_sigp_emergency"), + STATS_DESC_COUNTER("instruction_sigp_cond_emergency"), + STATS_DESC_COUNTER("instruction_sigp_start"), + STATS_DESC_COUNTER("instruction_sigp_stop"), + STATS_DESC_COUNTER("instruction_sigp_stop_store_status"), + STATS_DESC_COUNTER("instruction_sigp_store_status"), + STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"), + STATS_DESC_COUNTER("instruction_sigp_arch"), + STATS_DESC_COUNTER("instruction_sigp_prefix"), + STATS_DESC_COUNTER("instruction_sigp_restart"), + STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"), + STATS_DESC_COUNTER("instruction_sigp_cpu_reset"), + STATS_DESC_COUNTER("instruction_sigp_unknown"), + STATS_DESC_COUNTER("diagnose_10"), + STATS_DESC_COUNTER("diagnose_44"), + STATS_DESC_COUNTER("diagnose_9c"), + STATS_DESC_COUNTER("diagnose_9c_ignored"), + STATS_DESC_COUNTER("diagnose_258"), + STATS_DESC_COUNTER("diagnose_308"), + STATS_DESC_COUNTER("diagnose_500"), + STATS_DESC_COUNTER("diagnose_other"), + STATS_DESC_COUNTER("pfault_sync")); + +struct _kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vcpu_stats_desc), +}; + struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("userspace_handled", exit_userspace), VCPU_STAT("exit_null", exit_null), diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9a93d80caff6..84880687c199 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss); u64 __read_mostly supported_xss; EXPORT_SYMBOL_GPL(supported_xss); +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC( + STATS_DESC_COUNTER("mmu_shadow_zapped"), + STATS_DESC_COUNTER("mmu_pte_write"), + STATS_DESC_COUNTER("mmu_pde_zapped"), + STATS_DESC_COUNTER("mmu_flooded"), + STATS_DESC_COUNTER("mmu_recycled"), + STATS_DESC_COUNTER("mmu_cache_miss"), + STATS_DESC_ICOUNTER("mmu_unsync"), + STATS_DESC_ICOUNTER("largepages"), + STATS_DESC_ICOUNTER("nx_largepages_splits"), + STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions")); + +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("pf_fixed"), + STATS_DESC_COUNTER("pf_guest"), + STATS_DESC_COUNTER("tlb_flush"), + STATS_DESC_COUNTER("invlpg"), + STATS_DESC_COUNTER("exits"), + STATS_DESC_COUNTER("io_exits"), + STATS_DESC_COUNTER("mmio_exits"), + STATS_DESC_COUNTER("signal_exits"), + STATS_DESC_COUNTER("irq_window_exits"), + STATS_DESC_COUNTER("nmi_window_exits"), + STATS_DESC_COUNTER("l1d_flush"), + STATS_DESC_COUNTER("halt_exits"), + STATS_DESC_COUNTER("request_irq_exits"), + STATS_DESC_COUNTER("irq_exits"), + STATS_DESC_COUNTER("host_state_reload"), + STATS_DESC_COUNTER("fpu_reload"), + STATS_DESC_COUNTER("insn_emulation"), + STATS_DESC_COUNTER("insn_emulation_fail"), + STATS_DESC_COUNTER("hypercalls"), + STATS_DESC_COUNTER("irq_injections"), + STATS_DESC_COUNTER("nmi_injections"), + STATS_DESC_COUNTER("req_event"), + STATS_DESC_COUNTER("nested_run")); + +struct _kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vcpu_stats_desc), + .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = sizeof(struct kvm_stats_header) + + sizeof(kvm_vcpu_stats_desc), +}; + struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("pf_fixed", pf_fixed), VCPU_STAT("pf_guest", pf_guest), diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 97700e41db3b..52783f8062ca 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item { int mode; }; +struct _kvm_stats_header { + __u32 name_size; + __u32 count; + __u32 desc_offset; + __u32 data_offset; +}; + +#define KVM_STATS_NAME_LEN 48 +struct _kvm_stats_desc { + struct kvm_stats_desc desc; + char name[KVM_STATS_NAME_LEN]; +}; + #define KVM_DBGFS_GET_MODE(dbgfs_item) \ ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644) @@ -1253,8 +1266,122 @@ struct kvm_stats_debugfs_item { { n, offsetof(struct kvm_vcpu, stat.common.x), \ KVM_STAT_VCPU, ## __VA_ARGS__ } +#define STATS_DESC(name, type, unit, scale, exponent) \ + { \ + {type | unit | scale, exponent, 1}, name, \ + } +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent) \ + STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent) +#define STATS_DESC_INSTANT(name, unit, scale, exponent) \ + STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent) + +/* Cumulative counter */ +#define STATS_DESC_COUNTER(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE, \ + KVM_STATS_SCALE_POW10, 0) +/* Instantaneous counter */ +#define STATS_DESC_ICOUNTER(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE, \ + KVM_STATS_SCALE_POW10, 0) + +/* Cumulative clock cycles */ +#define STATS_DESC_CYCLE(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES, \ + KVM_STATS_SCALE_POW10, 0) +/* Instantaneous clock cycles */ +#define STATS_DESC_ICYCLE(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES, \ + KVM_STATS_SCALE_POW10, 0) + +/* Cumulative memory size in Byte */ +#define STATS_DESC_SIZE_BYTE(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 0) +/* Cumulative memory size in KiByte */ +#define STATS_DESC_SIZE_KBYTE(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 10) +/* Cumulative memory size in MiByte */ +#define STATS_DESC_SIZE_MBYTE(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 20) +/* Cumulative memory size in GiByte */ +#define STATS_DESC_SIZE_GBYTE(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 30) + +/* Instantaneous memory size in Byte */ +#define STATS_DESC_ISIZE_BYTE(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 0) +/* Instantaneous memory size in KiByte */ +#define STATS_DESC_ISIZE_KBYTE(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 10) +/* Instantaneous memory size in MiByte */ +#define STATS_DESC_ISIZE_MBYTE(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 20) +/* Instantaneous memory size in GiByte */ +#define STATS_DESC_ISIZE_GBYTE(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES, \ + KVM_STATS_SCALE_POW2, 30) + +/* Cumulative time in second */ +#define STATS_DESC_TIME_SEC(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, 0) +/* Cumulative time in millisecond */ +#define STATS_DESC_TIME_MSEC(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, -3) +/* Cumulative time in microsecond */ +#define STATS_DESC_TIME_USEC(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, -6) +/* Cumulative time in nanosecond */ +#define STATS_DESC_TIME_NSEC(name) \ + STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, -9) + +/* Instantaneous time in second */ +#define STATS_DESC_ITIME_SEC(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, 0) +/* Instantaneous time in millisecond */ +#define STATS_DESC_ITIME_MSEC(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, -3) +/* Instantaneous time in microsecond */ +#define STATS_DESC_ITIME_USEC(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, -6) +/* Instantaneous time in nanosecond */ +#define STATS_DESC_ITIME_NSEC(name) \ + STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS, \ + KVM_STATS_SCALE_POW10, -9) + +#define DEFINE_VM_STATS_DESC(...) { \ + STATS_DESC_COUNTER("remote_tlb_flush"), \ + ## __VA_ARGS__ \ +} + +#define DEFINE_VCPU_STATS_DESC(...) { \ + STATS_DESC_COUNTER("halt_successful_poll"), \ + STATS_DESC_COUNTER("halt_attempted_poll"), \ + STATS_DESC_COUNTER("halt_poll_invalid"), \ + STATS_DESC_COUNTER("halt_wakeup"), \ + STATS_DESC_TIME_NSEC("halt_poll_success_ns"), \ + STATS_DESC_TIME_NSEC("halt_poll_fail_ns"), \ + ## __VA_ARGS__ \ +} + extern struct kvm_stats_debugfs_item debugfs_entries[]; extern struct dentry *kvm_debugfs_dir; +extern struct _kvm_stats_header kvm_vm_stats_header; +extern struct _kvm_stats_header kvm_vcpu_stats_header; +extern struct _kvm_stats_desc kvm_vm_stats_desc[]; +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[]; #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 3fd9a7e9d90c..a64e92c7d9de 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_SGX_ATTRIBUTE 196 #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197 #define KVM_CAP_PTP_KVM 198 +#define KVM_CAP_STATS_BINARY_FD 199 #ifdef KVM_CAP_IRQ_ROUTING @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn { #define KVM_BUS_LOCK_DETECTION_OFF (1 << 0) #define KVM_BUS_LOCK_DETECTION_EXIT (1 << 1) +#define KVM_STATS_ID_MAXLEN 64 + +struct kvm_stats_header { + char id[KVM_STATS_ID_MAXLEN]; + __u32 name_size; + __u32 count; + __u32 desc_offset; + __u32 data_offset; +}; + +#define KVM_STATS_TYPE_SHIFT 0 +#define KVM_STATS_TYPE_MASK (0xF << KVM_STATS_TYPE_SHIFT) +#define KVM_STATS_TYPE_CUMULATIVE (0x0 << KVM_STATS_TYPE_SHIFT) +#define KVM_STATS_TYPE_INSTANT (0x1 << KVM_STATS_TYPE_SHIFT) +#define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_INSTANT + +#define KVM_STATS_UNIT_SHIFT 4 +#define KVM_STATS_UNIT_MASK (0xF << KVM_STATS_UNIT_SHIFT) +#define KVM_STATS_UNIT_NONE (0x0 << KVM_STATS_UNIT_SHIFT) +#define KVM_STATS_UNIT_BYTES (0x1 << KVM_STATS_UNIT_SHIFT) +#define KVM_STATS_UNIT_SECONDS (0x2 << KVM_STATS_UNIT_SHIFT) +#define KVM_STATS_UNIT_CYCLES (0x3 << KVM_STATS_UNIT_SHIFT) +#define KVM_STATS_UNIT_MAX KVM_STATS_UNIT_CYCLES + +#define KVM_STATS_SCALE_SHIFT 8 +#define KVM_STATS_SCALE_MASK (0xF << KVM_STATS_SCALE_SHIFT) +#define KVM_STATS_SCALE_POW10 (0x0 << KVM_STATS_SCALE_SHIFT) +#define KVM_STATS_SCALE_POW2 (0x1 << KVM_STATS_SCALE_SHIFT) +#define KVM_STATS_SCALE_MAX KVM_STATS_SCALE_POW2 + +struct kvm_stats_desc { + __u32 flags; + __s16 exponent; + __u16 size; + __u32 unused1; + __u32 unused2; + char name[0]; +}; + +struct kvm_vm_stats_data { + unsigned long value[0]; +}; + +struct kvm_vcpu_stats_data { + __u64 value[0]; +}; + +#define KVM_STATS_GETFD _IOR(KVMIO, 0xcc, struct kvm_stats_header) + #endif /* __LINUX_KVM_H */ diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 34a4cf265297..9e2c8dcdeae9 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3409,6 +3409,115 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) return 0; } +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, + size_t size, loff_t *offset) +{ + char id[KVM_STATS_ID_MAXLEN]; + struct kvm_vcpu *vcpu = file->private_data; + ssize_t copylen, len, remain = size; + size_t size_header, size_desc, size_stats; + loff_t pos = *offset; + char __user *dest = user_buffer; + void *src; + + snprintf(id, sizeof(id), "kvm-%d/vcpu-%d", + task_pid_nr(current), vcpu->vcpu_id); + size_header = sizeof(kvm_vcpu_stats_header); + size_desc = + kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc); + size_stats = sizeof(vcpu->stat); + + len = sizeof(id) + size_header + size_desc + size_stats - pos; + len = min(len, remain); + if (len <= 0) + return 0; + remain = len; + + /* Copy kvm vcpu stats header id string */ + copylen = sizeof(id) - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)id + pos; + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + /* Copy kvm vcpu stats header */ + copylen = sizeof(id) + size_header - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)&kvm_vcpu_stats_header; + src += pos - sizeof(id); + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + /* Copy kvm vcpu stats descriptors */ + copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)&kvm_vcpu_stats_desc; + src += pos - kvm_vcpu_stats_header.desc_offset; + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + /* Copy kvm vcpu stats values */ + copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)&vcpu->stat; + src += pos - kvm_vcpu_stats_header.data_offset; + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + + *offset = pos; + return len; +} + +static const struct file_operations kvm_vcpu_stats_fops = { + .read = kvm_vcpu_stats_read, + .llseek = noop_llseek, +}; + +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu) +{ + int error, fd; + struct file *file; + char name[15 + ITOA_MAX_LEN + 1]; + + snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id); + + error = get_unused_fd_flags(O_CLOEXEC); + if (error < 0) + return error; + fd = error; + + file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY); + if (IS_ERR(file)) { + error = PTR_ERR(file); + goto err_put_unused_fd; + } + file->f_mode |= FMODE_PREAD; + fd_install(fd, file); + + return fd; + +err_put_unused_fd: + put_unused_fd(fd); + return error; +} + static long kvm_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -3606,6 +3715,10 @@ static long kvm_vcpu_ioctl(struct file *filp, r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); break; } + case KVM_STATS_GETFD: { + r = kvm_vcpu_ioctl_get_statsfd(vcpu); + break; + } default: r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); } @@ -3864,6 +3977,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) #else return 0; #endif + case KVM_CAP_STATS_BINARY_FD: + return 1; default: break; } @@ -3967,6 +4082,111 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, } } +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, + size_t size, loff_t *offset) +{ + char id[KVM_STATS_ID_MAXLEN]; + struct kvm *kvm = file->private_data; + ssize_t copylen, len, remain = size; + size_t size_header, size_desc, size_stats; + loff_t pos = *offset; + char __user *dest = user_buffer; + void *src; + + snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current)); + size_header = sizeof(kvm_vm_stats_header); + size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc); + size_stats = sizeof(kvm->stat); + + len = sizeof(id) + size_header + size_desc + size_stats - pos; + len = min(len, remain); + if (len <= 0) + return 0; + remain = len; + + /* Copy kvm vm stats header id string */ + copylen = sizeof(id) - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)id + pos; + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + /* Copy kvm vm stats header */ + copylen = sizeof(id) + size_header - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)&kvm_vm_stats_header; + src += pos - sizeof(id); + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + /* Copy kvm vm stats descriptors */ + copylen = kvm_vm_stats_header.desc_offset + size_desc - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)&kvm_vm_stats_desc; + src += pos - kvm_vm_stats_header.desc_offset; + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + /* Copy kvm vm stats values */ + copylen = kvm_vm_stats_header.data_offset + size_stats - pos; + copylen = min(copylen, remain); + if (copylen > 0) { + src = (void *)&kvm->stat; + src += pos - kvm_vm_stats_header.data_offset; + if (copy_to_user(dest, src, copylen)) + return -EFAULT; + remain -= copylen; + pos += copylen; + dest += copylen; + } + + *offset = pos; + return len; +} + +static const struct file_operations kvm_vm_stats_fops = { + .read = kvm_vm_stats_read, + .llseek = noop_llseek, +}; + +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm) +{ + int error, fd; + struct file *file; + + error = get_unused_fd_flags(O_CLOEXEC); + if (error < 0) + return error; + fd = error; + + file = anon_inode_getfile("kvm-vm-stats", + &kvm_vm_stats_fops, kvm, O_RDONLY); + if (IS_ERR(file)) { + error = PTR_ERR(file); + goto err_put_unused_fd; + } + file->f_mode |= FMODE_PREAD; + fd_install(fd, file); + + return fd; + +err_put_unused_fd: + put_unused_fd(fd); + return error; +} + static long kvm_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -4149,6 +4369,9 @@ static long kvm_vm_ioctl(struct file *filp, case KVM_RESET_DIRTY_RINGS: r = kvm_vm_ioctl_reset_dirty_pages(kvm); break; + case KVM_STATS_GETFD: + r = kvm_vm_ioctl_get_statsfd(kvm); + break; default: r = kvm_arch_vm_ioctl(filp, ioctl, arg); }
Provides a file descriptor per VM to read VM stats info/data. Provides a file descriptor per vCPU to read vCPU stats info/data. Signed-off-by: Jing Zhang <jingzhangos@google.com> --- arch/arm64/kvm/guest.c | 26 +++++ arch/mips/kvm/mips.c | 52 +++++++++ arch/powerpc/kvm/book3s.c | 52 +++++++++ arch/powerpc/kvm/booke.c | 45 ++++++++ arch/s390/kvm/kvm-s390.c | 117 ++++++++++++++++++++ arch/x86/kvm/x86.c | 53 +++++++++ include/linux/kvm_host.h | 127 ++++++++++++++++++++++ include/uapi/linux/kvm.h | 50 +++++++++ virt/kvm/kvm_main.c | 223 ++++++++++++++++++++++++++++++++++++++ 9 files changed, 745 insertions(+)