[v8,77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP

Message ID	20200330101308.21702-78-alazar@bitdefender.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=cHma=5P=vger.kernel.org=kvm-owner@kernel.org> From: =?utf-8?q?Adalbert_Laz=C4=83r?= <alazar@bitdefender.com> To: kvm@vger.kernel.org Cc: virtualization@lists.linux-foundation.org, Paolo Bonzini <pbonzini@redhat.com>, =?utf-8?b?TmljdciZb3IgQ8OuyJt1?= <ncitu@bitdefender.com>, =?utf-8?q?Adalber?= =?utf-8?q?t_Laz=C4=83r?= <alazar@bitdefender.com> Subject: [PATCH v8 77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP Date: Mon, 30 Mar 2020 13:13:04 +0300 Message-Id: <20200330101308.21702-78-alazar@bitdefender.com> In-Reply-To: <20200330101308.21702-1-alazar@bitdefender.com> References: <20200330101308.21702-1-alazar@bitdefender.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk
Series	VM introspection \| expand [v8,00/81] VM introspection [v8,01/81] sched/swait: add swait_event_killable_exclusive() [v8,02/81] export kill_pid_info() [v8,03/81] KVM: add new error codes for VM introspection [v8,04/81] KVM: add kvm_vcpu_kick_and_wait() [v8,05/81] KVM: add kvm_get_max_gfn() [v8,06/81] KVM: doc: fix the hypercall numbering [v8,07/81] KVM: x86: add kvm_arch_vcpu_get_regs() and kvm_arch_vcpu_get_sregs() [v8,08/81] KVM: x86: add kvm_arch_vcpu_set_regs() [v8,09/81] KVM: x86: avoid injecting #PF when emulate the VMCALL instruction [v8,10/81] KVM: x86: add .bp_intercepted() to struct kvm_x86_ops [v8,11/81] KVM: x86: add .control_cr3_intercept() to struct kvm_x86_ops [v8,12/81] KVM: x86: add .cr3_write_intercepted() [v8,13/81] KVM: x86: add .desc_ctrl_supported() [v8,14/81] KVM: svm: add support for descriptor-table exits [v8,15/81] KVM: x86: add .control_desc_intercept() [v8,16/81] KVM: x86: add .desc_intercepted() [v8,17/81] KVM: x86: export .msr_write_intercepted() [v8,18/81] KVM: x86: use MSR_TYPE_R, MSR_TYPE_W and MSR_TYPE_RW with AMD code too [v8,19/81] KVM: svm: pass struct kvm_vcpu to set_msr_interception() [v8,20/81] KVM: vmx: pass struct kvm_vcpu to the intercept msr related functions [v8,21/81] KVM: x86: add .control_msr_intercept() [v8,22/81] KVM: x86: vmx: use a symbolic constant when checking the exit qualifications [v8,23/81] KVM: x86: save the error code during EPT/NPF exits handling [v8,24/81] KVM: x86: add .fault_gla() [v8,25/81] KVM: x86: add .spt_fault() [v8,26/81] KVM: x86: add .gpt_translation_fault() [v8,27/81] KVM: x86: add .control_singlestep() [v8,28/81] KVM: x86: export kvm_arch_vcpu_set_guest_debug() [v8,29/81] KVM: x86: extend kvm_mmu_gva_to_gpa_system() with the 'access' parameter [v8,30/81] KVM: x86: export kvm_inject_pending_exception() [v8,31/81] KVM: x86: export kvm_vcpu_ioctl_x86_get_xsave() [v8,32/81] KVM: x86: page track: provide all page tracking hooks with the guest virtual address [v8,33/81] KVM: x86: page track: add track_create_slot() callback [v8,34/81] KVM: x86: page_track: add support for preread, prewrite and preexec [v8,35/81] KVM: x86: wire in the preread/prewrite/preexec page trackers [v8,36/81] KVM: x86: intercept the write access on sidt and other emulated instructions [v8,37/81] KVM: x86: disable gpa_available optimization for fetch and page-walk NPF/EPT violations [v8,38/81] KVM: introduce VM introspection [v8,39/81] KVM: introspection: add hook/unhook ioctls [v8,40/81] KVM: introspection: add permission access ioctls [v8,41/81] KVM: introspection: add the read/dispatch message function [v8,42/81] KVM: introspection: add KVMI_GET_VERSION [v8,43/81] KVM: introspection: add KVMI_VM_CHECK_COMMAND and KVMI_VM_CHECK_EVENT [v8,44/81] KVM: introspection: add KVMI_VM_GET_INFO [v8,45/81] KVM: introspection: add KVMI_EVENT_UNHOOK [v8,46/81] KVM: introspection: add KVMI_VM_CONTROL_EVENTS [v8,47/81] KVM: introspection: add KVMI_VM_READ_PHYSICAL/KVMI_VM_WRITE_PHYSICAL [v8,48/81] KVM: introspection: add vCPU related data [v8,49/81] KVM: introspection: add a jobs list to every introspected vCPU [v8,50/81] KVM: introspection: handle vCPU introspection requests [v8,51/81] KVM: introspection: handle vCPU commands [v8,52/81] KVM: introspection: add KVMI_VCPU_GET_INFO [v8,53/81] KVM: introspection: add KVMI_VCPU_PAUSE [v8,54/81] KVM: introspection: add KVMI_EVENT_PAUSE_VCPU [v8,55/81] KVM: introspection: add crash action handling on event reply [v8,56/81] KVM: introspection: add KVMI_VCPU_CONTROL_EVENTS [v8,57/81] KVM: introspection: add KVMI_VCPU_GET_REGISTERS [v8,58/81] KVM: introspection: add KVMI_VCPU_SET_REGISTERS [v8,59/81] KVM: introspection: add KVMI_VCPU_GET_CPUID [v8,60/81] KVM: introspection: add KVMI_EVENT_HYPERCALL [v8,61/81] KVM: introspection: add KVMI_EVENT_BREAKPOINT [v8,62/81] KVM: introspection: restore the state of #BP interception on unhook [v8,63/81] KVM: introspection: add KVMI_VCPU_CONTROL_CR and KVMI_EVENT_CR [v8,64/81] KVM: introspection: restore the state of CR3 interception on unhook [v8,65/81] KVM: introspection: add KVMI_VCPU_INJECT_EXCEPTION + KVMI_EVENT_TRAP [v8,66/81] KVM: introspection: add KVMI_VM_GET_MAX_GFN [v8,67/81] KVM: introspection: add KVMI_EVENT_XSETBV [v8,68/81] KVM: introspection: add KVMI_VCPU_GET_XSAVE [v8,69/81] KVM: introspection: add KVMI_VCPU_GET_MTRR_TYPE [v8,70/81] KVM: introspection: add KVMI_EVENT_DESCRIPTOR [v8,71/81] KVM: introspection: restore the state of descriptor-table register interception on unhook [v8,72/81] KVM: introspection: add KVMI_VCPU_CONTROL_MSR and KVMI_EVENT_MSR [v8,73/81] KVM: introspection: restore the state of MSR interception on unhook [v8,74/81] KVM: introspection: add KVMI_VM_SET_PAGE_ACCESS [v8,75/81] KVM: introspection: add KVMI_EVENT_PF [v8,76/81] KVM: introspection: extend KVMI_GET_VERSION with struct kvmi_features [v8,77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP [v8,78/81] KVM: introspection: add KVMI_EVENT_SINGLESTEP [v8,79/81] KVM: introspection: add KVMI_VCPU_TRANSLATE_GVA [v8,80/81] KVM: introspection: emulate a guest page table walk on SPT violations due to A/D bit upd… [v8,81/81] KVM: x86: call the page tracking code on emulation failure

diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst index b211ae0ed86a..5e013ee4a79b 100644 --- a/Documentation/virt/kvm/kvmi.rst +++ b/Documentation/virt/kvm/kvmi.rst @@ -954,6 +954,38 @@ In order to 'forget' an address, all three bits ('rwx') must be set. * -KVM_EAGAIN - the selected vCPU can't be introspected yet * -KVM_ENOMEM - there is not enough memory to add the page tracking structures +20. KVMI_VCPU_CONTROL_SINGLESTEP +-------------------------------- + +:Architectures: x86 (vmx) +:Versions: >= 1 +:Parameters: + +:: + + struct kvmi_vcpu_hdr; + struct kvmi_vcpu_control_singlestep { + __u8 enable; + __u8 padding[7]; + }; + +:Returns: + +:: + + struct kvmi_error_code; + +Enables/disables singlestep for the selected vCPU. + +The introspection tool should use *KVMI_GET_VERSION*, to check +if the hardware supports singlestep (see **KVMI_GET_VERSION**). + +:Errors: + +* -KVM_EOPNOTSUPP - the hardware doesn't support singlestep +* -KVM_EINVAL - the padding is not zero +* -KVM_EAGAIN - the selected vCPU can't be introspected yet + Events ====== diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c index d7e1c0690c43..729f91a66405 100644 --- a/arch/x86/kvm/kvmi.c +++ b/arch/x86/kvm/kvmi.c @@ -1210,3 +1210,21 @@ bool kvmi_arch_pf_of_interest(struct kvm_vcpu *vcpu) !kvm_x86_ops->gpt_translation_fault(vcpu); } +bool kvmi_arch_start_singlestep(struct kvm_vcpu *vcpu) +{ + if (!kvm_x86_ops->control_singlestep) + return false; + + kvm_x86_ops->control_singlestep(vcpu, true); + return true; +} + +bool kvmi_arch_stop_singlestep(struct kvm_vcpu *vcpu) +{ + if (!kvm_x86_ops->control_singlestep) + return false; + + kvm_x86_ops->control_singlestep(vcpu, false); + return true; +} + diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ce2f9d47d6f6..12e9b4689025 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7738,6 +7738,13 @@ static int inject_pending_event(struct kvm_vcpu *vcpu, bool req_int_win) { int r; + if (kvmi_vcpu_running_singlestep(vcpu)) + /* + * We cannot inject events during single-stepping. + * Try again later. + */ + return -1; + /* try to reinject previous events if any */ if (vcpu->arch.exception.injected) diff --git a/include/linux/kvmi_host.h b/include/linux/kvmi_host.h index c9dd2d57033b..23784611996e 100644 --- a/include/linux/kvmi_host.h +++ b/include/linux/kvmi_host.h @@ -50,6 +50,10 @@ struct kvm_vcpu_introspection { bool pending; bool send_event; } exception; + + struct { + bool loop; + } singlestep; }; struct kvm_introspection { @@ -90,6 +94,7 @@ void kvmi_handle_requests(struct kvm_vcpu *vcpu); bool kvmi_hypercall_event(struct kvm_vcpu *vcpu); bool kvmi_breakpoint_event(struct kvm_vcpu *vcpu, u64 gva, u8 insn_len); bool kvmi_enter_guest(struct kvm_vcpu *vcpu); +bool kvmi_vcpu_running_singlestep(struct kvm_vcpu *vcpu); #else @@ -106,6 +111,8 @@ static inline bool kvmi_breakpoint_event(struct kvm_vcpu *vcpu, u64 gva, { return true; } static inline bool kvmi_enter_guest(struct kvm_vcpu *vcpu) { return true; } +static inline bool kvmi_vcpu_running_singlestep(struct kvm_vcpu *vcpu) + { return false; } #endif /* CONFIG_KVM_INTROSPECTION */ diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h index caf166e7ddff..97c4ef67bfe4 100644 --- a/include/uapi/linux/kvmi.h +++ b/include/uapi/linux/kvmi.h @@ -42,6 +42,8 @@ enum { KVMI_VM_SET_PAGE_ACCESS = 21, + KVMI_VCPU_CONTROL_SINGLESTEP = 22, + KVMI_NUM_MESSAGES }; @@ -178,6 +180,11 @@ struct kvmi_vm_set_page_access { struct kvmi_page_access_entry entries[0]; }; +struct kvmi_vcpu_control_singlestep { + __u8 enable; + __u8 padding[7]; +}; + struct kvmi_event { __u16 size; __u16 vcpu; diff --git a/tools/testing/selftests/kvm/x86_64/kvmi_test.c b/tools/testing/selftests/kvm/x86_64/kvmi_test.c index d4cfe595821d..27642000c4e4 100644 --- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c +++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c @@ -1668,6 +1668,28 @@ static void test_event_pf(struct kvm_vm *vm) test_pf(vm, cbk_test_event_pf); } +static void test_cmd_vcpu_control_singlestep(struct kvm_vm *vm) +{ + struct { + struct kvmi_msg_hdr hdr; + struct kvmi_vcpu_hdr vcpu_hdr; + struct kvmi_vcpu_control_singlestep cmd; + } req = {}; + + if (!features.singlestep) { + DEBUG("Skip %s()\n", __func__); + return; + } + + req.cmd.enable = true; + test_vcpu0_command(vm, KVMI_VCPU_CONTROL_SINGLESTEP, + &req.hdr, sizeof(req), NULL, 0); + + req.cmd.enable = false; + test_vcpu0_command(vm, KVMI_VCPU_CONTROL_SINGLESTEP, + &req.hdr, sizeof(req), NULL, 0); +} + static void test_introspection(struct kvm_vm *vm) { srandom(time(0)); @@ -1700,6 +1722,7 @@ static void test_introspection(struct kvm_vm *vm) test_cmd_vcpu_control_msr(vm); test_cmd_vm_set_page_access(vm); test_event_pf(vm); + test_cmd_vcpu_control_singlestep(vm); unhook_introspection(vm); } diff --git a/virt/kvm/introspection/kvmi.c b/virt/kvm/introspection/kvmi.c index e13b55856e9c..90e6c2d3dd4f 100644 --- a/virt/kvm/introspection/kvmi.c +++ b/virt/kvm/introspection/kvmi.c @@ -401,6 +401,9 @@ static void kvmi_job_release_vcpu(struct kvm_vcpu *vcpu, void *ctx) atomic_set(&vcpui->pause_requests, 0); vcpui->waiting_for_reply = false; + + if (vcpui->singlestep.loop) + kvmi_arch_stop_singlestep(vcpu); } static void kvmi_release_vcpus(struct kvm *kvm) @@ -1019,6 +1022,9 @@ bool kvmi_enter_guest(struct kvm_vcpu *vcpu) if (!kvmi) return true; + if (VCPUI(vcpu)->singlestep.loop) + kvmi_arch_start_singlestep(vcpu); + if (kvmi_inject_pending_exception(vcpu)) r = false; @@ -1297,3 +1303,20 @@ static void kvmi_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot, kvmi_put(kvm); } + +bool kvmi_vcpu_running_singlestep(struct kvm_vcpu *vcpu) +{ + struct kvm_introspection *kvmi; + bool ret; + + kvmi = kvmi_get(vcpu->kvm); + if (!kvmi) + return false; + + ret = VCPUI(vcpu)->singlestep.loop; + + kvmi_put(vcpu->kvm); + + return ret; +} +EXPORT_SYMBOL(kvmi_vcpu_running_singlestep); diff --git a/virt/kvm/introspection/kvmi_int.h b/virt/kvm/introspection/kvmi_int.h index e0cb58c60697..820081f8e3f1 100644 --- a/virt/kvm/introspection/kvmi_int.h +++ b/virt/kvm/introspection/kvmi_int.h @@ -128,5 +128,7 @@ bool kvmi_arch_pf_event(struct kvm_vcpu *vcpu, gpa_t gpa, gva_t gva, u8 access); bool kvmi_arch_pf_of_interest(struct kvm_vcpu *vcpu); void kvmi_arch_features(struct kvmi_features *feat); +bool kvmi_arch_start_singlestep(struct kvm_vcpu *vcpu); +bool kvmi_arch_stop_singlestep(struct kvm_vcpu *vcpu); #endif diff --git a/virt/kvm/introspection/kvmi_msg.c b/virt/kvm/introspection/kvmi_msg.c index 71a67154542f..14c063869c29 100644 --- a/virt/kvm/introspection/kvmi_msg.c +++ b/virt/kvm/introspection/kvmi_msg.c @@ -20,27 +20,28 @@ struct kvmi_vcpu_cmd_job { }; static const char *const msg_IDs[] = { - [KVMI_EVENT] = "KVMI_EVENT", - [KVMI_GET_VERSION] = "KVMI_GET_VERSION", - [KVMI_VM_CHECK_COMMAND] = "KVMI_VM_CHECK_COMMAND", - [KVMI_VM_CHECK_EVENT] = "KVMI_VM_CHECK_EVENT", - [KVMI_VM_CONTROL_EVENTS] = "KVMI_VM_CONTROL_EVENTS", - [KVMI_VM_GET_INFO] = "KVMI_VM_GET_INFO", - [KVMI_VM_GET_MAX_GFN] = "KVMI_VM_GET_MAX_GFN", - [KVMI_VM_READ_PHYSICAL] = "KVMI_VM_READ_PHYSICAL", - [KVMI_VM_SET_PAGE_ACCESS] = "KVMI_VM_SET_PAGE_ACCESS", - [KVMI_VM_WRITE_PHYSICAL] = "KVMI_VM_WRITE_PHYSICAL", - [KVMI_VCPU_CONTROL_CR] = "KVMI_VCPU_CONTROL_CR", - [KVMI_VCPU_CONTROL_EVENTS] = "KVMI_VCPU_CONTROL_EVENTS", - [KVMI_VCPU_CONTROL_MSR] = "KVMI_VCPU_CONTROL_MSR", - [KVMI_VCPU_GET_CPUID] = "KVMI_VCPU_GET_CPUID", - [KVMI_VCPU_GET_INFO] = "KVMI_VCPU_GET_INFO", - [KVMI_VCPU_GET_MTRR_TYPE] = "KVMI_VCPU_GET_MTRR_TYPE", - [KVMI_VCPU_GET_REGISTERS] = "KVMI_VCPU_GET_REGISTERS", - [KVMI_VCPU_GET_XSAVE] = "KVMI_VCPU_GET_XSAVE", - [KVMI_VCPU_INJECT_EXCEPTION] = "KVMI_VCPU_INJECT_EXCEPTION", - [KVMI_VCPU_PAUSE] = "KVMI_VCPU_PAUSE", - [KVMI_VCPU_SET_REGISTERS] = "KVMI_VCPU_SET_REGISTERS", + [KVMI_EVENT] = "KVMI_EVENT", + [KVMI_GET_VERSION] = "KVMI_GET_VERSION", + [KVMI_VM_CHECK_COMMAND] = "KVMI_VM_CHECK_COMMAND", + [KVMI_VM_CHECK_EVENT] = "KVMI_VM_CHECK_EVENT", + [KVMI_VM_CONTROL_EVENTS] = "KVMI_VM_CONTROL_EVENTS", + [KVMI_VM_GET_INFO] = "KVMI_VM_GET_INFO", + [KVMI_VM_GET_MAX_GFN] = "KVMI_VM_GET_MAX_GFN", + [KVMI_VM_READ_PHYSICAL] = "KVMI_VM_READ_PHYSICAL", + [KVMI_VM_SET_PAGE_ACCESS] = "KVMI_VM_SET_PAGE_ACCESS", + [KVMI_VM_WRITE_PHYSICAL] = "KVMI_VM_WRITE_PHYSICAL", + [KVMI_VCPU_CONTROL_CR] = "KVMI_VCPU_CONTROL_CR", + [KVMI_VCPU_CONTROL_EVENTS] = "KVMI_VCPU_CONTROL_EVENTS", + [KVMI_VCPU_CONTROL_MSR] = "KVMI_VCPU_CONTROL_MSR", + [KVMI_VCPU_CONTROL_SINGLESTEP] = "KVMI_VCPU_CONTROL_SINGLESTEP", + [KVMI_VCPU_GET_CPUID] = "KVMI_VCPU_GET_CPUID", + [KVMI_VCPU_GET_INFO] = "KVMI_VCPU_GET_INFO", + [KVMI_VCPU_GET_MTRR_TYPE] = "KVMI_VCPU_GET_MTRR_TYPE", + [KVMI_VCPU_GET_REGISTERS] = "KVMI_VCPU_GET_REGISTERS", + [KVMI_VCPU_GET_XSAVE] = "KVMI_VCPU_GET_XSAVE", + [KVMI_VCPU_INJECT_EXCEPTION] = "KVMI_VCPU_INJECT_EXCEPTION", + [KVMI_VCPU_PAUSE] = "KVMI_VCPU_PAUSE", + [KVMI_VCPU_SET_REGISTERS] = "KVMI_VCPU_SET_REGISTERS", }; static const char *id2str(u16 id) @@ -619,6 +620,34 @@ static int handle_vcpu_control_msr(const struct kvmi_vcpu_cmd_job *job, return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0); } +static int handle_vcpu_control_singlestep(const struct kvmi_vcpu_cmd_job *job, + const struct kvmi_msg_hdr *msg, + const void *_req) +{ + const struct kvmi_vcpu_control_singlestep *req = _req; + struct kvm_vcpu *vcpu = job->vcpu; + int ec = -KVM_EINVAL; + bool done; + int i; + + for (i = 0; i < sizeof(req->padding); i++) + if (req->padding[i]) + goto reply; + + if (req->enable) + done = kvmi_arch_start_singlestep(vcpu); + else + done = kvmi_arch_stop_singlestep(vcpu); + + if (done) { + ec = 0; + VCPUI(vcpu)->singlestep.loop = !!req->enable; + } + +reply: + return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0); +} + /* * These commands are executed from the vCPU thread. The receiving thread * passes the messages using a newly allocated 'struct kvmi_vcpu_cmd_job' @@ -627,17 +656,18 @@ static int handle_vcpu_control_msr(const struct kvmi_vcpu_cmd_job *job, */ static int(*const msg_vcpu[])(const struct kvmi_vcpu_cmd_job *, const struct kvmi_msg_hdr *, const void *) = { - [KVMI_EVENT] = handle_event_reply, - [KVMI_VCPU_CONTROL_CR] = handle_vcpu_control_cr, - [KVMI_VCPU_CONTROL_EVENTS] = handle_vcpu_control_events, - [KVMI_VCPU_CONTROL_MSR] = handle_vcpu_control_msr, - [KVMI_VCPU_GET_CPUID] = handle_get_cpuid, - [KVMI_VCPU_GET_INFO] = handle_get_vcpu_info, - [KVMI_VCPU_GET_MTRR_TYPE] = handle_vcpu_get_mtrr_type, - [KVMI_VCPU_GET_REGISTERS] = handle_get_registers, - [KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave, - [KVMI_VCPU_INJECT_EXCEPTION] = handle_vcpu_inject_exception, - [KVMI_VCPU_SET_REGISTERS] = handle_set_registers, + [KVMI_EVENT] = handle_event_reply, + [KVMI_VCPU_CONTROL_CR] = handle_vcpu_control_cr, + [KVMI_VCPU_CONTROL_EVENTS] = handle_vcpu_control_events, + [KVMI_VCPU_CONTROL_MSR] = handle_vcpu_control_msr, + [KVMI_VCPU_CONTROL_SINGLESTEP] = handle_vcpu_control_singlestep, + [KVMI_VCPU_GET_CPUID] = handle_get_cpuid, + [KVMI_VCPU_GET_INFO] = handle_get_vcpu_info, + [KVMI_VCPU_GET_MTRR_TYPE] = handle_vcpu_get_mtrr_type, + [KVMI_VCPU_GET_REGISTERS] = handle_get_registers, + [KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave, + [KVMI_VCPU_INJECT_EXCEPTION] = handle_vcpu_inject_exception, + [KVMI_VCPU_SET_REGISTERS] = handle_set_registers, }; static bool is_vcpu_command(u16 id)

[v8,77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP

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