[v10,77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP

Message ID	20201125093600.2766-78-alazar@bitdefender.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <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?= <nicu.citu@icloud.com>, =?utf-8?q?Adalbert?= =?utf-8?q?_Laz=C4=83r?= <alazar@bitdefender.com> Subject: [PATCH v10 77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP Date: Wed, 25 Nov 2020 11:35:56 +0200 Message-Id: <20201125093600.2766-78-alazar@bitdefender.com> In-Reply-To: <20201125093600.2766-1-alazar@bitdefender.com> References: <20201125093600.2766-1-alazar@bitdefender.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	VM introspection \| expand [v10,00/81] VM introspection [v10,01/81] KVM: UAPI: add error codes used by the VM introspection code [v10,02/81] KVM: add kvm_vcpu_kick_and_wait() [v10,03/81] KVM: add kvm_get_max_gfn() [v10,04/81] KVM: doc: fix the hypercalls numbering [v10,05/81] KVM: x86: add kvm_arch_vcpu_get_regs() and kvm_arch_vcpu_get_sregs() [v10,06/81] KVM: x86: add kvm_arch_vcpu_set_regs() [v10,07/81] KVM: x86: avoid injecting #PF when emulate the VMCALL instruction [v10,08/81] KVM: x86: add kvm_x86_ops.bp_intercepted() [v10,09/81] KVM: x86: add kvm_x86_ops.control_cr3_intercept() [v10,10/81] KVM: x86: add kvm_x86_ops.cr3_write_intercepted() [v10,11/81] KVM: x86: add kvm_x86_ops.desc_ctrl_supported() [v10,12/81] KVM: svm: add support for descriptor-table VM-exits [v10,13/81] KVM: x86: add kvm_x86_ops.control_desc_intercept() [v10,14/81] KVM: x86: add kvm_x86_ops.desc_intercepted() [v10,15/81] KVM: x86: add kvm_x86_ops.msr_write_intercepted() [v10,16/81] KVM: x86: svm: use the vmx convention to control the MSR interception [v10,17/81] KVM: x86: add kvm_x86_ops.control_msr_intercept() [v10,18/81] KVM: x86: vmx: use a symbolic constant when checking the exit qualifications [v10,19/81] KVM: x86: save the error code during EPT/NPF exits handling [v10,20/81] KVM: x86: add kvm_x86_ops.fault_gla() [v10,21/81] KVM: x86: add kvm_x86_ops.control_singlestep() [v10,22/81] KVM: x86: export kvm_arch_vcpu_set_guest_debug() [v10,23/81] KVM: x86: extend kvm_mmu_gva_to_gpa_system() with the 'access' parameter [v10,24/81] KVM: x86: export kvm_inject_pending_exception() [v10,25/81] KVM: x86: export kvm_vcpu_ioctl_x86_get_xsave() [v10,26/81] KVM: x86: export kvm_vcpu_ioctl_x86_set_xsave() [v10,27/81] KVM: x86: page track: provide all callbacks with the guest virtual address [v10,28/81] KVM: x86: page track: add track_create_slot() callback [v10,29/81] KVM: x86: page_track: add support for preread, prewrite and preexec [v10,30/81] KVM: x86: wire in the preread/prewrite/preexec page trackers [v10,31/81] KVM: x86: disable gpa_available optimization for fetch and page-walk SPT violations [v10,32/81] KVM: introduce VM introspection [v10,33/81] KVM: introspection: add hook/unhook ioctls [v10,34/81] KVM: introspection: add permission access ioctls [v10,35/81] KVM: introspection: add the read/dispatch message function [v10,36/81] KVM: introspection: add KVMI_GET_VERSION [v10,37/81] KVM: introspection: add KVMI_VM_CHECK_COMMAND and KVMI_VM_CHECK_EVENT [v10,38/81] KVM: introspection: add KVMI_VM_GET_INFO [v10,39/81] KVM: introspection: add KVM_INTROSPECTION_PREUNHOOK [v10,40/81] KVM: introspection: add KVMI_VM_EVENT_UNHOOK [v10,41/81] KVM: introspection: add KVMI_VM_CONTROL_EVENTS [v10,42/81] KVM: introspection: add KVMI_VM_READ_PHYSICAL/KVMI_VM_WRITE_PHYSICAL [v10,43/81] KVM: introspection: add vCPU related data [v10,44/81] KVM: introspection: add a jobs list to every introspected vCPU [v10,45/81] KVM: introspection: handle vCPU introspection requests [v10,46/81] KVM: introspection: handle vCPU commands [v10,47/81] KVM: introspection: add KVMI_VCPU_GET_INFO [v10,48/81] KVM: introspection: add KVMI_VM_PAUSE_VCPU [v10,49/81] KVM: introspection: add support for vCPU events [v10,50/81] KVM: introspection: add KVMI_VCPU_EVENT_PAUSE [v10,51/81] KVM: introspection: add the crash action handling on the event reply [v10,52/81] KVM: introspection: add KVMI_VCPU_CONTROL_EVENTS [v10,53/81] KVM: introspection: add KVMI_VCPU_GET_REGISTERS [v10,54/81] KVM: introspection: add KVMI_VCPU_SET_REGISTERS [v10,55/81] KVM: introspection: add KVMI_VCPU_GET_CPUID [v10,56/81] KVM: introspection: add KVMI_VCPU_EVENT_HYPERCALL [v10,57/81] KVM: introspection: add KVMI_VCPU_EVENT_BREAKPOINT [v10,58/81] KVM: introspection: add cleanup support for vCPUs [v10,59/81] KVM: introspection: restore the state of #BP interception on unhook [v10,60/81] KVM: introspection: add KVMI_VM_CONTROL_CLEANUP [v10,61/81] KVM: introspection: add KVMI_VCPU_CONTROL_CR and KVMI_VCPU_EVENT_CR [v10,62/81] KVM: introspection: restore the state of CR3 interception on unhook [v10,63/81] KVM: introspection: add KVMI_VCPU_INJECT_EXCEPTION + KVMI_VCPU_EVENT_TRAP [v10,64/81] KVM: introspection: add KVMI_VM_GET_MAX_GFN [v10,65/81] KVM: introspection: add KVMI_VCPU_EVENT_XSETBV [v10,66/81] KVM: introspection: add KVMI_VCPU_GET_XCR [v10,67/81] KVM: introspection: add KVMI_VCPU_GET_XSAVE [v10,68/81] KVM: introspection: add KVMI_VCPU_SET_XSAVE [v10,69/81] KVM: introspection: add KVMI_VCPU_GET_MTRR_TYPE [v10,70/81] KVM: introspection: add KVMI_VCPU_EVENT_DESCRIPTOR [v10,71/81] KVM: introspection: restore the state of descriptor-table register interception on unho… [v10,72/81] KVM: introspection: add KVMI_VCPU_CONTROL_MSR and KVMI_VCPU_EVENT_MSR [v10,73/81] KVM: introspection: restore the state of MSR interception on unhook [v10,74/81] KVM: introspection: add KVMI_VM_SET_PAGE_ACCESS [v10,75/81] KVM: introspection: add KVMI_VCPU_EVENT_PF [v10,76/81] KVM: introspection: extend KVMI_GET_VERSION with struct kvmi_features [v10,77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP [v10,78/81] KVM: introspection: add KVMI_VCPU_EVENT_SINGLESTEP [v10,79/81] KVM: introspection: add KVMI_VCPU_TRANSLATE_GVA [v10,80/81] KVM: introspection: emulate a guest page table walk on SPT violations due to A/D bit up… [v10,81/81] 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 991922897f1d..c8822912d8c8 100644 --- a/Documentation/virt/kvm/kvmi.rst +++ b/Documentation/virt/kvm/kvmi.rst @@ -791,6 +791,7 @@ exception. * -KVM_EINVAL - the selected vCPU is invalid * -KVM_EINVAL - the padding is not zero * -KVM_EAGAIN - the selected vCPU can't be introspected yet +* -KVM_EBUSY - the vCPU is switched in singlestep mode (*KVMI_VCPU_CONTROL_SINGLESTEP*) * -KVM_EBUSY - another *KVMI_VCPU_INJECT_EXCEPTION*-*KVMI_VCPU_EVENT_TRAP* pair is in progress @@ -1036,6 +1037,38 @@ 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 +24. 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 e0302883aec5..31a2de24de29 100644 --- a/arch/x86/kvm/kvmi.c +++ b/arch/x86/kvm/kvmi.c @@ -776,7 +776,9 @@ void kvmi_enter_guest(struct kvm_vcpu *vcpu) if (kvmi) { vcpui = VCPUI(vcpu); - if (vcpui->arch.exception.pending) + if (vcpui->singlestep.loop) + kvmi_arch_start_singlestep(vcpu); + else if (vcpui->arch.exception.pending) kvmi_inject_pending_exception(vcpu); kvmi_put(vcpu->kvm); @@ -1086,3 +1088,13 @@ void kvmi_arch_features(struct kvmi_features *feat) { feat->singlestep = !!kvm_x86_ops.control_singlestep; } + +void kvmi_arch_start_singlestep(struct kvm_vcpu *vcpu) +{ + kvm_x86_ops.control_singlestep(vcpu, true); +} + +void kvmi_arch_stop_singlestep(struct kvm_vcpu *vcpu) +{ + kvm_x86_ops.control_singlestep(vcpu, false); +} diff --git a/arch/x86/kvm/kvmi_msg.c b/arch/x86/kvm/kvmi_msg.c index c961c5367a13..8b59f9f73c5d 100644 --- a/arch/x86/kvm/kvmi_msg.c +++ b/arch/x86/kvm/kvmi_msg.c @@ -166,7 +166,8 @@ static int handle_vcpu_inject_exception(const struct kvmi_vcpu_msg_job *job, else if (req->padding1 || req->padding2) ec = -KVM_EINVAL; else if (VCPUI(vcpu)->arch.exception.pending || - VCPUI(vcpu)->arch.exception.send_event) + VCPUI(vcpu)->arch.exception.send_event || + VCPUI(vcpu)->singlestep.loop) ec = -KVM_EBUSY; else ec = kvmi_arch_cmd_vcpu_inject_exception(vcpu, req); @@ -276,18 +277,49 @@ static int handle_vcpu_control_msr(const struct kvmi_vcpu_msg_job *job, return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0); } +static int handle_vcpu_control_singlestep(const struct kvmi_vcpu_msg_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 = 0; + + if (non_zero_padding(req->padding, ARRAY_SIZE(req->padding)) || + req->enable > 1) { + ec = -KVM_EINVAL; + goto reply; + } + + if (!kvm_x86_ops.control_singlestep) { + ec = -KVM_EOPNOTSUPP; + goto reply; + } + + if (req->enable) + kvmi_arch_start_singlestep(vcpu); + else + kvmi_arch_stop_singlestep(vcpu); + + VCPUI(vcpu)->singlestep.loop = !!req->enable; + +reply: + return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0); +} + static kvmi_vcpu_msg_job_fct const msg_vcpu[] = { - [KVMI_VCPU_CONTROL_CR] = handle_vcpu_control_cr, - [KVMI_VCPU_CONTROL_MSR] = handle_vcpu_control_msr, - [KVMI_VCPU_GET_CPUID] = handle_vcpu_get_cpuid, - [KVMI_VCPU_GET_INFO] = handle_vcpu_get_info, - [KVMI_VCPU_GET_MTRR_TYPE] = handle_vcpu_get_mtrr_type, - [KVMI_VCPU_GET_REGISTERS] = handle_vcpu_get_registers, - [KVMI_VCPU_GET_XCR] = handle_vcpu_get_xcr, - [KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave, - [KVMI_VCPU_INJECT_EXCEPTION] = handle_vcpu_inject_exception, - [KVMI_VCPU_SET_REGISTERS] = handle_vcpu_set_registers, - [KVMI_VCPU_SET_XSAVE] = handle_vcpu_set_xsave, + [KVMI_VCPU_CONTROL_CR] = handle_vcpu_control_cr, + [KVMI_VCPU_CONTROL_MSR] = handle_vcpu_control_msr, + [KVMI_VCPU_CONTROL_SINGLESTEP] = handle_vcpu_control_singlestep, + [KVMI_VCPU_GET_CPUID] = handle_vcpu_get_cpuid, + [KVMI_VCPU_GET_INFO] = handle_vcpu_get_info, + [KVMI_VCPU_GET_MTRR_TYPE] = handle_vcpu_get_mtrr_type, + [KVMI_VCPU_GET_REGISTERS] = handle_vcpu_get_registers, + [KVMI_VCPU_GET_XCR] = handle_vcpu_get_xcr, + [KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave, + [KVMI_VCPU_INJECT_EXCEPTION] = handle_vcpu_inject_exception, + [KVMI_VCPU_SET_REGISTERS] = handle_vcpu_set_registers, + [KVMI_VCPU_SET_XSAVE] = handle_vcpu_set_xsave, }; kvmi_vcpu_msg_job_fct kvmi_arch_vcpu_msg_handler(u16 id) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 0ffa2e73284e..cc7292ee3b2d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8957,9 +8957,15 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) goto out; } - inject_pending_event(vcpu, &req_immediate_exit); - if (req_int_win) - kvm_x86_ops.enable_irq_window(vcpu); + if (!kvmi_vcpu_running_singlestep(vcpu)) { + /* + * We cannot inject events during single-stepping. + * Try again later. + */ + inject_pending_event(vcpu, &req_immediate_exit); + if (req_int_win) + kvm_x86_ops.enable_irq_window(vcpu); + } if (kvm_lapic_enabled(vcpu)) { update_cr8_intercept(vcpu); diff --git a/include/linux/kvmi_host.h b/include/linux/kvmi_host.h index 14ac075a3ea9..e2103ab9d0d5 100644 --- a/include/linux/kvmi_host.h +++ b/include/linux/kvmi_host.h @@ -33,6 +33,10 @@ struct kvm_vcpu_introspection { bool waiting_for_reply; unsigned long *ev_enable_mask; + + struct { + bool loop; + } singlestep; }; struct kvm_introspection { @@ -76,6 +80,7 @@ int kvmi_ioctl_preunhook(struct kvm *kvm); 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_vcpu_running_singlestep(struct kvm_vcpu *vcpu); #else @@ -90,6 +95,8 @@ static inline void kvmi_handle_requests(struct kvm_vcpu *vcpu) { } static inline bool kvmi_hypercall_event(struct kvm_vcpu *vcpu) { return false; } static inline bool kvmi_breakpoint_event(struct kvm_vcpu *vcpu, u64 gva, u8 insn_len) { 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 43631ed2b06c..91126607b7eb 100644 --- a/include/uapi/linux/kvmi.h +++ b/include/uapi/linux/kvmi.h @@ -38,18 +38,19 @@ enum { enum { KVMI_VCPU_EVENT = KVMI_VCPU_MESSAGE_ID(0), - KVMI_VCPU_GET_INFO = KVMI_VCPU_MESSAGE_ID(1), - KVMI_VCPU_CONTROL_EVENTS = KVMI_VCPU_MESSAGE_ID(2), - KVMI_VCPU_GET_REGISTERS = KVMI_VCPU_MESSAGE_ID(3), - KVMI_VCPU_SET_REGISTERS = KVMI_VCPU_MESSAGE_ID(4), - KVMI_VCPU_GET_CPUID = KVMI_VCPU_MESSAGE_ID(5), - KVMI_VCPU_CONTROL_CR = KVMI_VCPU_MESSAGE_ID(6), - KVMI_VCPU_INJECT_EXCEPTION = KVMI_VCPU_MESSAGE_ID(7), - KVMI_VCPU_GET_XCR = KVMI_VCPU_MESSAGE_ID(8), - KVMI_VCPU_GET_XSAVE = KVMI_VCPU_MESSAGE_ID(9), - KVMI_VCPU_SET_XSAVE = KVMI_VCPU_MESSAGE_ID(10), - KVMI_VCPU_GET_MTRR_TYPE = KVMI_VCPU_MESSAGE_ID(11), - KVMI_VCPU_CONTROL_MSR = KVMI_VCPU_MESSAGE_ID(12), + KVMI_VCPU_GET_INFO = KVMI_VCPU_MESSAGE_ID(1), + KVMI_VCPU_CONTROL_EVENTS = KVMI_VCPU_MESSAGE_ID(2), + KVMI_VCPU_GET_REGISTERS = KVMI_VCPU_MESSAGE_ID(3), + KVMI_VCPU_SET_REGISTERS = KVMI_VCPU_MESSAGE_ID(4), + KVMI_VCPU_GET_CPUID = KVMI_VCPU_MESSAGE_ID(5), + KVMI_VCPU_CONTROL_CR = KVMI_VCPU_MESSAGE_ID(6), + KVMI_VCPU_INJECT_EXCEPTION = KVMI_VCPU_MESSAGE_ID(7), + KVMI_VCPU_GET_XCR = KVMI_VCPU_MESSAGE_ID(8), + KVMI_VCPU_GET_XSAVE = KVMI_VCPU_MESSAGE_ID(9), + KVMI_VCPU_SET_XSAVE = KVMI_VCPU_MESSAGE_ID(10), + KVMI_VCPU_GET_MTRR_TYPE = KVMI_VCPU_MESSAGE_ID(11), + KVMI_VCPU_CONTROL_MSR = KVMI_VCPU_MESSAGE_ID(12), + KVMI_VCPU_CONTROL_SINGLESTEP = KVMI_VCPU_MESSAGE_ID(13), KVMI_NEXT_VCPU_MESSAGE }; @@ -221,4 +222,9 @@ struct kvmi_vcpu_event_pf { __u32 padding3; }; +struct kvmi_vcpu_control_singlestep { + __u8 enable; + __u8 padding[7]; +}; + #endif /* _UAPI__LINUX_KVMI_H */ diff --git a/tools/testing/selftests/kvm/x86_64/kvmi_test.c b/tools/testing/selftests/kvm/x86_64/kvmi_test.c index 9984b0247ae9..d959216aac9d 100644 --- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c +++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c @@ -1819,6 +1819,44 @@ static void test_event_pf(struct kvm_vm *vm) test_pf(vm, cbk_test_event_pf); } +static void cmd_vcpu_singlestep(struct kvm_vm *vm, __u8 enable, + int expected_err) +{ + struct { + struct kvmi_msg_hdr hdr; + struct kvmi_vcpu_hdr vcpu_hdr; + struct kvmi_vcpu_control_singlestep cmd; + } req = {}; + + req.cmd.enable = enable; + + test_vcpu0_command(vm, KVMI_VCPU_CONTROL_SINGLESTEP, + &req.hdr, sizeof(req), NULL, 0, expected_err); +} + +static void test_supported_singlestep(struct kvm_vm *vm) +{ + __u8 disable = 0, enable = 1, enable_inval = 2; + + cmd_vcpu_singlestep(vm, enable, 0); + cmd_vcpu_singlestep(vm, disable, 0); + + cmd_vcpu_singlestep(vm, enable_inval, -KVM_EINVAL); +} + +static void test_unsupported_singlestep(struct kvm_vm *vm) +{ + cmd_vcpu_singlestep(vm, 1, -KVM_EOPNOTSUPP); +} + +static void test_cmd_vcpu_control_singlestep(struct kvm_vm *vm) +{ + if (features.singlestep) + test_supported_singlestep(vm); + else + test_unsupported_singlestep(vm); +} + static void test_introspection(struct kvm_vm *vm) { srandom(time(0)); @@ -1853,6 +1891,7 @@ 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 a228178ddba2..f620396d1887 100644 --- a/virt/kvm/introspection/kvmi.c +++ b/virt/kvm/introspection/kvmi.c @@ -436,6 +436,11 @@ 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); + vcpui->singlestep.loop = false; + } } static void kvmi_release_vcpus(struct kvm *kvm) @@ -1170,3 +1175,20 @@ void kvmi_remove_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) spin_unlock(&kvm->mmu_lock); srcu_read_unlock(&kvm->srcu, idx); } + +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 a51e7e4ed511..4815fa61b136 100644 --- a/virt/kvm/introspection/kvmi_int.h +++ b/virt/kvm/introspection/kvmi_int.h @@ -122,5 +122,7 @@ void kvmi_arch_update_page_tracking(struct kvm *kvm, void kvmi_arch_hook(struct kvm *kvm); void kvmi_arch_unhook(struct kvm *kvm); void kvmi_arch_features(struct kvmi_features *feat); +void kvmi_arch_start_singlestep(struct kvm_vcpu *vcpu); +void kvmi_arch_stop_singlestep(struct kvm_vcpu *vcpu); #endif

[v10,77/81] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP

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