Jon Doron <arilou@xxxxxxxxx> writes:
> Add support for Hyper-V synthetic debugger (syndbg) interface.
> The syndbg interface is using MSRs to emulate a way to send/recv packets
> data.
>
> The debug transport dll (kdvm/kdnet) will identify if Hyper-V is enabled
> and if it supports the synthetic debugger interface it will attempt to
> use it, instead of trying to initialize a network adapter.
>
This commit seem to break tests, e.g.
# ./tools/testing/selftests/kvm/x86_64/state_test
==== Test Assertion Failure ====
lib/x86_64/processor.c:1023: r == nmsrs
pid=26436 tid=26436 - Argument list too long
1 0x000000000040a87f: vcpu_save_state at processor.c:1022 (discriminator 3)
2 0x00000000004011b3: main at state_test.c:171 (discriminator 4)
3 0x00007f0315cc63d4: ?? ??:0
4 0x0000000000401357: _start at ??:?
Unexpected result from KVM_GET_MSRS, r: 60 (failed MSR was 0x400000ff)
The problem is that the newly introduced MSRs don't allow
reading/writing by the host when KVM_CAP_HYPERV_SYNDBG is disabled, I
think we'll need to relax the requirement and allow at reading/writing by
the host. Something like
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index f17156d36419..ca1f10498705 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -301,11 +301,11 @@ static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr)
kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
}
-static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
+static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
{
struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
- if (!syndbg->active)
+ if (!syndbg->active && !host)
return 1;
trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id,
@@ -313,7 +313,8 @@ static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
switch (msr) {
case HV_X64_MSR_SYNDBG_CONTROL:
syndbg->control.control = data;
- syndbg_exit(vcpu, msr);
+ if (!host)
+ syndbg_exit(vcpu, msr);
break;
case HV_X64_MSR_SYNDBG_STATUS:
syndbg->control.status = data;
@@ -326,7 +327,8 @@ static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
break;
case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
syndbg->control.pending_page = data;
- syndbg_exit(vcpu, msr);
+ if (!host)
+ syndbg_exit(vcpu, msr);
break;
case HV_X64_MSR_SYNDBG_OPTIONS:
syndbg->options = data;
@@ -338,11 +340,11 @@ static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
return 0;
}
-static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
+static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
{
struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
- if (!syndbg->active)
+ if (!syndbg->active && !host)
return 1;
switch (msr) {
@@ -1174,7 +1176,7 @@ static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
break;
case HV_X64_MSR_SYNDBG_OPTIONS:
case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
- return syndbg_set_msr(vcpu, msr, data);
+ return syndbg_set_msr(vcpu, msr, data, host);
default:
vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
msr, data);
@@ -1304,7 +1306,7 @@ static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
return 0;
}
-static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
+static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
{
u64 data = 0;
struct kvm *kvm = vcpu->kvm;
@@ -1343,7 +1345,7 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
break;
case HV_X64_MSR_SYNDBG_OPTIONS:
case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
- return syndbg_get_msr(vcpu, msr, pdata);
+ return syndbg_get_msr(vcpu, msr, pdata, host);
default:
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
@@ -1433,7 +1435,7 @@ int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
int r;
mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
- r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
+ r = kvm_hv_get_msr_pw(vcpu, msr, pdata, host);
mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
return r;
} else
Note that I also omit syndbg_exit() when
HV_X64_MSR_SYNDBG_PENDING_BUFFER/HV_X64_MSR_SYNDBG_CONTROL are
written by the host to not get a self-induced exit to userspace, this is
likely not what we want on e.g. migration. Without it, we will fail
again:
==== Test Assertion Failure ====
x86_64/state_test.c:151: run->exit_reason == KVM_EXIT_IO
pid=7827 tid=7827 - Argument list too long
1 0x0000000000401109: main at state_test.c:148
2 0x00007ff5308d63d4: ?? ??:0
3 0x0000000000401357: _start at ??:?
Stage 2: unexpected exit reason: 27 (Unknown),
Alternatively, we may introduce a way to hide unsupported MSRs from
KVM_GET_MSRS but we don't do it for existing Hyper-V MSRs as of yet.
> Signed-off-by: Jon Doron <arilou@xxxxxxxxx>
> ---
> Documentation/virt/kvm/api.rst | 16 ++++
> arch/x86/include/asm/kvm_host.h | 14 +++
> arch/x86/kvm/hyperv.c | 158 +++++++++++++++++++++++++++++++-
> arch/x86/kvm/hyperv.h | 6 ++
> arch/x86/kvm/trace.h | 51 +++++++++++
> arch/x86/kvm/x86.c | 13 +++
> include/uapi/linux/kvm.h | 11 +++
> 7 files changed, 268 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 4872c47bbcff..fe992dcf4f93 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -5024,6 +5024,7 @@ EOI was received.
> struct kvm_hyperv_exit {
> #define KVM_EXIT_HYPERV_SYNIC 1
> #define KVM_EXIT_HYPERV_HCALL 2
> + #define KVM_EXIT_HYPERV_SYNDBG 3
> __u32 type;
> __u32 pad1;
> union {
> @@ -5039,6 +5040,15 @@ EOI was received.
> __u64 result;
> __u64 params[2];
> } hcall;
> + struct {
> + __u32 msr;
> + __u32 pad2;
> + __u64 control;
> + __u64 status;
> + __u64 send_page;
> + __u64 recv_page;
> + __u64 pending_page;
> + } syndbg;
> } u;
> };
> /* KVM_EXIT_HYPERV */
> @@ -5055,6 +5065,12 @@ Hyper-V SynIC state change. Notification is used to remap SynIC
> event/message pages and to enable/disable SynIC messages/events processing
> in userspace.
>
> + - KVM_EXIT_HYPERV_SYNDBG -- synchronously notify user-space about
> +
> +Hyper-V Synthetic debugger state change. Notification is used to either update
> +the pending_page location or to send a control command (send the buffer located
> +in send_page or recv a buffer to recv_page).
> +
> ::
>
> /* KVM_EXIT_ARM_NISV */
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 98959e8cd448..c09fa7401b13 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -854,6 +854,19 @@ struct kvm_apic_map {
> struct kvm_lapic *phys_map[];
> };
>
> +/* Hyper-V synthetic debugger (SynDbg)*/
> +struct kvm_hv_syndbg {
> + struct {
> + u64 control;
> + u64 status;
> + u64 send_page;
> + u64 recv_page;
> + u64 pending_page;
> + } control;
> + u64 options;
> + bool active;
> +};
> +
> /* Hyper-V emulation context */
> struct kvm_hv {
> struct mutex hv_lock;
> @@ -877,6 +890,7 @@ struct kvm_hv {
> atomic_t num_mismatched_vp_indexes;
>
> struct hv_partition_assist_pg *hv_pa_pg;
> + struct kvm_hv_syndbg hv_syndbg;
> };
>
> enum kvm_irqchip_mode {
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index 7383c7e7d4af..cd8d0142a841 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -266,6 +266,115 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
> return ret;
> }
>
> +void kvm_hv_activate_syndbg(struct kvm_vcpu *vcpu)
> +{
> + struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
> +
> + syndbg->active = true;
> +}
> +
> +static int kvm_hv_syndbg_complete_userspace(struct kvm_vcpu *vcpu)
> +{
> + struct kvm *kvm = vcpu->kvm;
> + struct kvm_hv *hv = &kvm->arch.hyperv;
> +
> + if (vcpu->run->hyperv.u.syndbg.msr == HV_X64_MSR_SYNDBG_CONTROL)
> + hv->hv_syndbg.control.status =
> + vcpu->run->hyperv.u.syndbg.status;
> + return 1;
> +}
> +
> +static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr)
> +{
> + struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
> + struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
> +
> + hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNDBG;
> + hv_vcpu->exit.u.syndbg.msr = msr;
> + hv_vcpu->exit.u.syndbg.control = syndbg->control.control;
> + hv_vcpu->exit.u.syndbg.send_page = syndbg->control.send_page;
> + hv_vcpu->exit.u.syndbg.recv_page = syndbg->control.recv_page;
> + hv_vcpu->exit.u.syndbg.pending_page = syndbg->control.pending_page;
> + vcpu->arch.complete_userspace_io =
> + kvm_hv_syndbg_complete_userspace;
> +
> + kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
> +}
> +
> +static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
> +{
> + struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
> +
> + if (!syndbg->active)
> + return 1;
> +
> + trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id,
> + vcpu_to_hv_vcpu(vcpu)->vp_index, msr, data);
> + switch (msr) {
> + case HV_X64_MSR_SYNDBG_CONTROL:
> + syndbg->control.control = data;
> + syndbg_exit(vcpu, msr);
> + break;
> + case HV_X64_MSR_SYNDBG_STATUS:
> + syndbg->control.status = data;
> + break;
> + case HV_X64_MSR_SYNDBG_SEND_BUFFER:
> + syndbg->control.send_page = data;
> + break;
> + case HV_X64_MSR_SYNDBG_RECV_BUFFER:
> + syndbg->control.recv_page = data;
> + break;
> + case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> + syndbg->control.pending_page = data;
> + syndbg_exit(vcpu, msr);
> + break;
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> + syndbg->options = data;
> + break;
> + default:
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
> +{
> + struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
> +
> + if (!syndbg->active)
> + return 1;
> +
> + switch (msr) {
> + case HV_X64_MSR_SYNDBG_CONTROL:
> + *pdata = syndbg->control.control;
> + break;
> + case HV_X64_MSR_SYNDBG_STATUS:
> + *pdata = syndbg->control.status;
> + break;
> + case HV_X64_MSR_SYNDBG_SEND_BUFFER:
> + *pdata = syndbg->control.send_page;
> + break;
> + case HV_X64_MSR_SYNDBG_RECV_BUFFER:
> + *pdata = syndbg->control.recv_page;
> + break;
> + case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> + *pdata = syndbg->control.pending_page;
> + break;
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> + *pdata = syndbg->options;
> + break;
> + default:
> + break;
> + }
> +
> + trace_kvm_hv_syndbg_get_msr(vcpu->vcpu_id,
> + vcpu_to_hv_vcpu(vcpu)->vp_index, msr,
> + *pdata);
> +
> + return 0;
> +}
> +
> static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata,
> bool host)
> {
> @@ -800,6 +909,8 @@ static bool kvm_hv_msr_partition_wide(u32 msr)
> case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
> case HV_X64_MSR_TSC_EMULATION_CONTROL:
> case HV_X64_MSR_TSC_EMULATION_STATUS:
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> + case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> r = true;
> break;
> }
> @@ -1061,6 +1172,9 @@ static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
> if (!host)
> return 1;
> break;
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> + case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> + return syndbg_set_msr(vcpu, msr, data);
> default:
> vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
> msr, data);
> @@ -1227,6 +1341,9 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
> case HV_X64_MSR_TSC_EMULATION_STATUS:
> data = hv->hv_tsc_emulation_status;
> break;
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> + case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> + return syndbg_get_msr(vcpu, msr, pdata);
> default:
> vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
> return 1;
> @@ -1799,9 +1916,16 @@ static struct kvm_cpuid_entry2 evmcs_cpuid_entries[] = {
> { .function = HYPERV_CPUID_NESTED_FEATURES },
> };
>
> +static struct kvm_cpuid_entry2 syndbg_cpuid_entries[] = {
> + { .function = HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS },
> + { .function = HYPERV_CPUID_SYNDBG_INTERFACE },
> + { .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES },
> +};
> +
> #define HV_MAX_CPUID_ENTRIES \
> ARRAY_SIZE(core_cpuid_entries) +\
> - ARRAY_SIZE(evmcs_cpuid_entries)
> + ARRAY_SIZE(evmcs_cpuid_entries) +\
> + ARRAY_SIZE(syndbg_cpuid_entries)
>
> int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
> struct kvm_cpuid_entry2 __user *entries)
> @@ -1809,6 +1933,7 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
> uint16_t evmcs_ver = 0;
> struct kvm_cpuid_entry2 cpuid_entries[HV_MAX_CPUID_ENTRIES];
> int i, nent = 0;
> + struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
>
> /* Set the core cpuid entries required for Hyper-V */
> memcpy(&cpuid_entries[nent], &core_cpuid_entries,
> @@ -1825,6 +1950,13 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
> nent += ARRAY_SIZE(evmcs_cpuid_entries);
> }
>
> + if (syndbg->active) {
> + /* Syndbg is enabled, add the required Syndbg CPUID leafs */
> + memcpy(&cpuid_entries[nent], &syndbg_cpuid_entries,
> + sizeof(syndbg_cpuid_entries));
> + nent += ARRAY_SIZE(syndbg_cpuid_entries);
> + }
> +
> if (cpuid->nent < nent)
> return -E2BIG;
>
> @@ -1878,6 +2010,12 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
> ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
> ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
>
> + if (syndbg->active) {
> + ent->ebx |= HV_X64_DEBUGGING;
> + ent->edx |= HV_X64_GUEST_DEBUGGING_AVAILABLE;
> + ent->edx |= HV_FEATURE_DEBUG_MSRS_AVAILABLE;
> + }
> +
> /*
> * Direct Synthetic timers only make sense with in-kernel
> * LAPIC
> @@ -1921,6 +2059,24 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
>
> break;
>
> + case HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS:
> + memcpy(signature, "Linux KVM Hv", 12);
> +
> + ent->eax = 0;
> + ent->ebx = signature[0];
> + ent->ecx = signature[1];
> + ent->edx = signature[2];
> + break;
> +
> + case HYPERV_CPUID_SYNDBG_INTERFACE:
> + memcpy(signature, "VS#1\0\0\0\0\0\0\0\0", 12);
> + ent->eax = signature[0];
> + break;
> +
> + case HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES:
> + ent->eax |= HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
> + break;
> +
> default:
> break;
> }
> diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
> index 5e4780bf6dd7..45aaaf08bf15 100644
> --- a/arch/x86/kvm/hyperv.h
> +++ b/arch/x86/kvm/hyperv.h
> @@ -73,6 +73,11 @@ static inline struct kvm_vcpu *synic_to_vcpu(struct kvm_vcpu_hv_synic *synic)
> return hv_vcpu_to_vcpu(container_of(synic, struct kvm_vcpu_hv, synic));
> }
>
> +static inline struct kvm_hv_syndbg *vcpu_to_hv_syndbg(struct kvm_vcpu *vcpu)
> +{
> + return &vcpu->kvm->arch.hyperv.hv_syndbg;
> +}
> +
> int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host);
> int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host);
>
> @@ -83,6 +88,7 @@ void kvm_hv_irq_routing_update(struct kvm *kvm);
> int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint);
> void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector);
> int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages);
> +void kvm_hv_activate_syndbg(struct kvm_vcpu *vcpu);
>
> void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu);
> void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu);
> diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
> index f194dd058470..bf6c3852868d 100644
> --- a/arch/x86/kvm/trace.h
> +++ b/arch/x86/kvm/trace.h
> @@ -1515,6 +1515,57 @@ TRACE_EVENT(kvm_nested_vmenter_failed,
> __print_symbolic(__entry->err, VMX_VMENTER_INSTRUCTION_ERRORS))
> );
>
> +/*
> + * Tracepoint for syndbg_set_msr.
> + */
> +TRACE_EVENT(kvm_hv_syndbg_set_msr,
> + TP_PROTO(int vcpu_id, u32 vp_index, u32 msr, u64 data),
> + TP_ARGS(vcpu_id, vp_index, msr, data),
> +
> + TP_STRUCT__entry(
> + __field(int, vcpu_id)
> + __field(u32, vp_index)
> + __field(u32, msr)
> + __field(u64, data)
> + ),
> +
> + TP_fast_assign(
> + __entry->vcpu_id = vcpu_id;
> + __entry->vp_index = vp_index;
> + __entry->msr = msr;
> + __entry->data = data;
> + ),
> +
> + TP_printk("vcpu_id %d vp_index %u msr 0x%x data 0x%llx",
> + __entry->vcpu_id, __entry->vp_index, __entry->msr,
> + __entry->data)
> +);
> +
> +/*
> + * Tracepoint for syndbg_get_msr.
> + */
> +TRACE_EVENT(kvm_hv_syndbg_get_msr,
> + TP_PROTO(int vcpu_id, u32 vp_index, u32 msr, u64 data),
> + TP_ARGS(vcpu_id, vp_index, msr, data),
> +
> + TP_STRUCT__entry(
> + __field(int, vcpu_id)
> + __field(u32, vp_index)
> + __field(u32, msr)
> + __field(u64, data)
> + ),
> +
> + TP_fast_assign(
> + __entry->vcpu_id = vcpu_id;
> + __entry->vp_index = vp_index;
> + __entry->msr = msr;
> + __entry->data = data;
> + ),
> +
> + TP_printk("vcpu_id %d vp_index %u msr 0x%x data 0x%llx",
> + __entry->vcpu_id, __entry->vp_index, __entry->msr,
> + __entry->data)
> +);
> #endif /* _TRACE_KVM_H */
>
> #undef TRACE_INCLUDE_PATH
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 3156e25b0774..7bfa30d7a525 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1214,6 +1214,10 @@ static const u32 emulated_msrs_all[] = {
> HV_X64_MSR_VP_ASSIST_PAGE,
> HV_X64_MSR_REENLIGHTENMENT_CONTROL, HV_X64_MSR_TSC_EMULATION_CONTROL,
> HV_X64_MSR_TSC_EMULATION_STATUS,
> + HV_X64_MSR_SYNDBG_OPTIONS,
> + HV_X64_MSR_SYNDBG_CONTROL, HV_X64_MSR_SYNDBG_STATUS,
> + HV_X64_MSR_SYNDBG_SEND_BUFFER, HV_X64_MSR_SYNDBG_RECV_BUFFER,
> + HV_X64_MSR_SYNDBG_PENDING_BUFFER,
>
> MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
> MSR_KVM_PV_EOI_EN,
> @@ -2906,6 +2910,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> */
> break;
> case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
> + case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
> case HV_X64_MSR_CRASH_CTL:
> case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
> @@ -3151,6 +3157,8 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> msr_info->data = 0x20000000;
> break;
> case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
> + case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
> + case HV_X64_MSR_SYNDBG_OPTIONS:
> case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
> case HV_X64_MSR_CRASH_CTL:
> case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
> @@ -3323,6 +3331,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
> case KVM_CAP_HYPERV_TLBFLUSH:
> case KVM_CAP_HYPERV_SEND_IPI:
> case KVM_CAP_HYPERV_CPUID:
> + case KVM_CAP_HYPERV_SYNDBG:
> case KVM_CAP_PCI_SEGMENT:
> case KVM_CAP_DEBUGREGS:
> case KVM_CAP_X86_ROBUST_SINGLESTEP:
> @@ -4178,6 +4187,10 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
> return -EINVAL;
>
> switch (cap->cap) {
> + case KVM_CAP_HYPERV_SYNDBG:
> + kvm_hv_activate_syndbg(vcpu);
> + return 0;
> +
> case KVM_CAP_HYPERV_SYNIC2:
> if (cap->args[0])
> return -EINVAL;
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 7ee0ddc4c457..0b573e1155c8 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -188,6 +188,7 @@ struct kvm_s390_cmma_log {
> struct kvm_hyperv_exit {
> #define KVM_EXIT_HYPERV_SYNIC 1
> #define KVM_EXIT_HYPERV_HCALL 2
> +#define KVM_EXIT_HYPERV_SYNDBG 3
> __u32 type;
> __u32 pad1;
> union {
> @@ -203,6 +204,15 @@ struct kvm_hyperv_exit {
> __u64 result;
> __u64 params[2];
> } hcall;
> + struct {
> + __u32 msr;
> + __u32 pad2;
> + __u64 control;
> + __u64 status;
> + __u64 send_page;
> + __u64 recv_page;
> + __u64 pending_page;
> + } syndbg;
> } u;
> };
>
> @@ -1012,6 +1022,7 @@ struct kvm_ppc_resize_hpt {
> #define KVM_CAP_ARM_NISV_TO_USER 177
> #define KVM_CAP_ARM_INJECT_EXT_DABT 178
> #define KVM_CAP_S390_VCPU_RESETS 179
> +#define KVM_CAP_HYPERV_SYNDBG 180
>
> #ifdef KVM_CAP_IRQ_ROUTING
--
Vitaly
