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Peter Anvin" , Ingo Molnar , Jim Mattson , Joerg Roedel , Sean Christopherson , Wanpeng Li , kvm@vger.kernel.org, x86@kernel.org Subject: [RFC PATCH v3 4/5] kvm/x86: virtual suspend time injection: Implement host side Date: Wed, 20 Oct 2021 21:04:29 +0900 Message-Id: <20211020210348.RFC.v3.4.I9c4e7c844507384b546e6d1ea1a5286996eed908@changeid> X-Mailer: git-send-email 2.33.0.1079.g6e70778dc9-goog In-Reply-To: <20211020120431.776494-1-hikalium@chromium.org> References: <20211020120431.776494-1-hikalium@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211020_050520_506836_307F7BE4 X-CRM114-Status: GOOD ( 29.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add main logics that adjust the guest's clocks and notify about the suspension to the guest. Adjustment flow: - Before going into suspend, KVM_REQ_SUSPEND_TIME_ADJ will be requested for each vcpus through the PM notifier if the suspend time injection is enabled for the kvm. - Before the first vmenter after the resume, each vcpu will check the the request and do two kinds of adjustments. - One is kvm-wide adjustment: kvm-clock will be adjusted to the value before the suspend. - Another is per-vcpu adjustment: tsc will be adjusted to the value before the suspend. - Those adjustments happen before the vcpu run: so the guest will not observe the "rewinding" of the clocks. - After the adjustment is made, the guest will be notified about the adjustment through HYPERVISOR_CALLBACK_VECTOR IRQ. - It is guest's responsibility to adjust their CLOCK_BOOTTIME and the wall clock to reflect the suspend. This will be done in the later patch. Signed-off-by: Hikaru Nishida --- Changes in v3: - Used PM notifier instead of modifying timekeeping_resume() - This avoids holding kvm_lock under interrupt disabled context. - Used KVM_REQ_* to make a request for vcpus. - Reused HYPERVISOR_CALLBACK_VECTOR IRQ instead of adding a new one. - Extracted arch-independent parts. arch/x86/include/asm/kvm_host.h | 2 + arch/x86/kvm/Kconfig | 13 ++++ arch/x86/kvm/cpuid.c | 4 ++ arch/x86/kvm/x86.c | 109 ++++++++++++++++++++++++++++++++ include/linux/kvm_host.h | 48 ++++++++++++++ virt/kvm/kvm_main.c | 88 ++++++++++++++++++++++++++ 6 files changed, 264 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index f8f48a7ec577..bdff8f777632 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1085,6 +1085,8 @@ struct kvm_arch { bool pause_in_guest; bool cstate_in_guest; + u64 msr_suspend_time; + unsigned long irq_sources_bitmap; s64 kvmclock_offset; raw_spinlock_t tsc_write_lock; diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index ac69894eab88..6d68a4d6be87 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -129,4 +129,17 @@ config KVM_MMU_AUDIT This option adds a R/W kVM module parameter 'mmu_audit', which allows auditing of KVM MMU events at runtime. +config KVM_VIRT_SUSPEND_TIMING + bool "Host support for virtual suspend time injection" + depends on KVM=y && HAVE_KVM_PM_NOTIFIER + default n + help + This option makes the host's suspension reflected on the guest's clocks. + In other words, guest's CLOCK_MONOTONIC will stop and + CLOCK_BOOTTIME keeps running during the host's suspension. + This feature will only be effective when both guest and host support + this feature. For the guest side, see KVM_VIRT_SUSPEND_TIMING_GUEST. + + If unsure, say N. + endif # VIRTUALIZATION diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 751aa85a3001..34a2fe147503 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -886,6 +886,10 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) (1 << KVM_FEATURE_PV_SCHED_YIELD) | (1 << KVM_FEATURE_ASYNC_PF_INT); +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING + entry->eax |= (1 << KVM_FEATURE_HOST_SUSPEND_TIME); +#endif + if (sched_info_on()) entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index aabd3a2ec1bc..b6d0d7f73196 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1367,6 +1367,7 @@ static const u32 emulated_msrs_all[] = { MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, MSR_KVM_PV_EOI_EN, MSR_KVM_ASYNC_PF_INT, MSR_KVM_ASYNC_PF_ACK, + MSR_KVM_HOST_SUSPEND_TIME, MSR_IA32_TSC_ADJUST, MSR_IA32_TSC_DEADLINE, @@ -3467,6 +3468,19 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) vcpu->arch.msr_kvm_poll_control = data; break; + case MSR_KVM_HOST_SUSPEND_TIME: + if (!guest_pv_has(vcpu, KVM_FEATURE_HOST_SUSPEND_TIME)) + return 1; + + if (!(data & KVM_MSR_ENABLED)) + break; + + if (kvm_init_suspend_time_ghc(vcpu->kvm, data & ~1ULL)) + return 1; + + vcpu->kvm->arch.msr_suspend_time = data; + break; + case MSR_IA32_MCG_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: @@ -3785,6 +3799,12 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) msr_info->data = vcpu->arch.msr_kvm_poll_control; break; + case MSR_KVM_HOST_SUSPEND_TIME: + if (!guest_pv_has(vcpu, KVM_FEATURE_HOST_SUSPEND_TIME)) + return 1; + + msr_info->data = vcpu->kvm->arch.msr_suspend_time; + break; case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MCG_CAP: @@ -9392,6 +9412,93 @@ void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(__kvm_request_immediate_exit); +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING +bool virt_suspend_time_enabled(struct kvm *kvm) +{ + return kvm->arch.msr_suspend_time & KVM_MSR_ENABLED; +} + +/* + * Do per-vcpu suspend time adjustment (tsc) and + * make an interrupt to notify it. + */ +static void vcpu_do_suspend_time_adjustment(struct kvm_vcpu *vcpu, + u64 total_ns) +{ + struct kvm_lapic_irq irq = { + .delivery_mode = APIC_DM_FIXED, + .vector = HYPERVISOR_CALLBACK_VECTOR + }; + u64 last_suspend_duration = 0; + s64 adj; + + spin_lock(&vcpu->suspend_time_ns_lock); + if (total_ns > vcpu->suspend_time_ns) { + last_suspend_duration = total_ns - vcpu->suspend_time_ns; + vcpu->suspend_time_ns = total_ns; + } + spin_unlock(&vcpu->suspend_time_ns_lock); + + if (!last_suspend_duration) { + /* It looks like the suspend is not happened yet. Retry. */ + kvm_make_request(KVM_REQ_SUSPEND_TIME_ADJ, vcpu); + return; + } + + adj = __this_cpu_read(cpu_tsc_khz) * + (last_suspend_duration / 1000000); + adjust_tsc_offset_host(vcpu, -adj); + /* + * This request should be processed before + * the first vmenter after resume to avoid + * an unadjusted TSC value is observed. + */ + kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); + kvm_write_suspend_time(vcpu->kvm); + if (!kvm_apic_set_irq(vcpu, &irq, NULL)) + pr_err("kvm: failed to set suspend time irq\n"); +} + +/* + * Do kvm-wide suspend time adjustment (kvm-clock). + */ +static void kvm_do_suspend_time_adjustment(struct kvm *kvm, u64 total_ns) +{ + spin_lock(&kvm->suspend_time_ns_lock); + if (total_ns > kvm->suspend_time_ns) { + u64 last_suspend_duration = total_ns - kvm->suspend_time_ns; + /* + * Move the offset of kvm_clock here as if it is stopped + * during the suspension. + */ + kvm->arch.kvmclock_offset -= last_suspend_duration; + + /* suspend_time is accumulated per VM. */ + kvm->suspend_time_ns += last_suspend_duration; + /* + * This adjustment will be reflected to the struct provided + * from the guest via MSR_KVM_HOST_SUSPEND_TIME before + * the notification interrupt is injected. + */ + kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE); + } + spin_unlock(&kvm->suspend_time_ns_lock); +} + +static void kvm_adjust_suspend_time(struct kvm_vcpu *vcpu) +{ + u64 total_ns = kvm_total_suspend_time(vcpu->kvm); + /* Do kvm-wide adjustment (kvm-clock) */ + kvm_do_suspend_time_adjustment(vcpu->kvm, total_ns); + /* Do per-vcpu adjustment (tsc) */ + vcpu_do_suspend_time_adjustment(vcpu, total_ns); +} +#else +static void kvm_adjust_suspend_time(struct kvm_vcpu *vcpu) +{ +} +#endif + /* * Returns 1 to let vcpu_run() continue the guest execution loop without * exiting to the userspace. Otherwise, the value will be returned to the @@ -9421,6 +9528,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) r = -EIO; goto out; } + if (kvm_check_request(KVM_REQ_SUSPEND_TIME_ADJ, vcpu)) + kvm_adjust_suspend_time(vcpu); if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) { if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) { r = 0; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 0f18df7fe874..ef93c067ceba 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -151,6 +151,7 @@ static inline bool is_error_page(struct page *page) #define KVM_REQ_UNBLOCK 2 #define KVM_REQ_UNHALT 3 #define KVM_REQ_VM_BUGGED (4 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_SUSPEND_TIME_ADJ 5 #define KVM_REQUEST_ARCH_BASE 8 #define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \ @@ -336,6 +337,11 @@ struct kvm_vcpu { } async_pf; #endif +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING + u64 suspend_time_ns; + spinlock_t suspend_time_ns_lock; +#endif + #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT /* * Cpu relax intercept or pause loop exit optimization @@ -623,6 +629,12 @@ struct kvm { struct notifier_block pm_notifier; #endif char stats_id[KVM_STATS_NAME_SIZE]; +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING + u64 suspend_time_ns; + spinlock_t suspend_time_ns_lock; + u64 base_offs_boot_ns; + struct gfn_to_hva_cache suspend_time_ghc; +#endif }; #define kvm_err(fmt, ...) \ @@ -1829,6 +1841,42 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu) } #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING +bool virt_suspend_time_enabled(struct kvm *kvm); +void kvm_write_suspend_time(struct kvm *kvm); +int kvm_init_suspend_time_ghc(struct kvm *kvm, gpa_t gpa); +static inline u64 kvm_total_suspend_time(struct kvm *kvm) +{ + return ktime_get_offs_boot_ns() - kvm->base_offs_boot_ns; +} + +static inline u64 vcpu_suspend_time_injected(struct kvm_vcpu *vcpu) +{ + return vcpu->suspend_time_ns; +} +#else +static inline bool virt_suspend_time_enabled(struct kvm *kvm) +{ + return 0; +} +static inline void kvm_write_suspend_time(struct kvm *kvm) +{ +} +static inline int kvm_init_suspend_time_ghc(struct kvm *kvm, gpa_t gpa) +{ + return 1; +} +static inline u64 kvm_total_suspend_time(struct kvm *kvm) +{ + return 0; +} + +static inline u64 vcpu_suspend_time_injected(struct kvm_vcpu *vcpu) +{ + return 0; +} +#endif /* CONFIG_KVM_VIRT_SUSPEND_TIMING */ + /* * This defines how many reserved entries we want to keep before we * kick the vcpu to the userspace to avoid dirty ring full. This diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7851f3a1b5f7..a4fedd2455d4 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -425,6 +425,11 @@ static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) vcpu->ready = false; preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); vcpu->last_used_slot = 0; + +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING + vcpu->suspend_time_ns = kvm->suspend_time_ns; + spin_lock_init(&vcpu->suspend_time_ns_lock); +#endif } void kvm_vcpu_destroy(struct kvm_vcpu *vcpu) @@ -812,12 +817,70 @@ static int kvm_init_mmu_notifier(struct kvm *kvm) #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER +static int kvm_suspend_notifier(struct kvm *kvm) +{ + struct kvm_vcpu *vcpu; + int i; + + if (!virt_suspend_time_enabled(kvm)) + return NOTIFY_DONE; + + mutex_lock(&kvm->lock); + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_make_request(KVM_REQ_SUSPEND_TIME_ADJ, vcpu); + mutex_unlock(&kvm->lock); + + return NOTIFY_DONE; +} + +static int kvm_resume_notifier(struct kvm *kvm) +{ + struct kvm_vcpu *vcpu; + int i; + + if (!virt_suspend_time_enabled(kvm)) + return NOTIFY_DONE; + + mutex_lock(&kvm->lock); + kvm_for_each_vcpu(i, vcpu, kvm) { + /* + * Clear KVM_REQ_SUSPEND_TIME_ADJ if the suspend injection is + * not needed (e.g. suspend failure) + * The following condition is also true when the adjustment is + * already done and it is safe to clear the request again here. + */ + if (kvm_total_suspend_time(kvm) == + vcpu_suspend_time_injected(vcpu)) + kvm_clear_request(KVM_REQ_SUSPEND_TIME_ADJ, vcpu); + } + mutex_unlock(&kvm->lock); + + return NOTIFY_DONE; +} + +static int kvm_pm_notifier(struct kvm *kvm, unsigned long state) +{ + switch (state) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + return kvm_suspend_notifier(kvm); + case PM_POST_HIBERNATION: + case PM_POST_SUSPEND: + return kvm_resume_notifier(kvm); + } + + return NOTIFY_DONE; +} + static int kvm_pm_notifier_call(struct notifier_block *bl, unsigned long state, void *unused) { struct kvm *kvm = container_of(bl, struct kvm, pm_notifier); + if (kvm_pm_notifier(kvm, state) != NOTIFY_DONE) + return NOTIFY_BAD; + return kvm_arch_pm_notifier(kvm, state); } @@ -843,6 +906,26 @@ static void kvm_destroy_pm_notifier(struct kvm *kvm) } #endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */ +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING +void kvm_write_suspend_time(struct kvm *kvm) +{ + struct kvm_suspend_time st; + + st.suspend_time_ns = kvm->suspend_time_ns; + kvm_write_guest_cached(kvm, &kvm->suspend_time_ghc, &st, sizeof(st)); +} + +int kvm_init_suspend_time_ghc(struct kvm *kvm, gpa_t gpa) +{ + if (kvm_gfn_to_hva_cache_init(kvm, &kvm->suspend_time_ghc, gpa, + sizeof(struct kvm_suspend_time))) + return 1; + + kvm_write_suspend_time(kvm); + return 0; +} +#endif + static struct kvm_memslots *kvm_alloc_memslots(void) { int i; @@ -1080,6 +1163,11 @@ static struct kvm *kvm_create_vm(unsigned long type) if (r) goto out_err_no_disable; +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING + spin_lock_init(&kvm->suspend_time_ns_lock); + kvm->base_offs_boot_ns = ktime_get_offs_boot_ns(); +#endif + #ifdef CONFIG_HAVE_KVM_IRQFD INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); #endif