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KVM: SVM: Create trace events for VMGEXIT MSR protocol processing

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Add trace events for entry to and exit from VMGEXIT MSR protocol
processing. The vCPU will be common for the trace events. The MSR
protocol processing is guided by the GHCB GPA in the VMCB, so the GHCB
GPA will represent the input and output values for the entry and exit
events, respectively. Additionally, the exit event will contain the
return code for the event.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <c5b3b440c3e0db43ff2fc02813faa94fa54896b0.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tom Lendacky 2020-12-10 11:09:52 -06:00 committed by Paolo Bonzini
parent d523ab6ba2
commit 59e38b58de
3 changed files with 52 additions and 0 deletions
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6
arch/x86/kvm/svm/sev.c
View File

@ -1530,6 +1530,9 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
ghcb_info = control->ghcb_gpa & GHCB_MSR_INFO_MASK;
trace_kvm_vmgexit_msr_protocol_enter(svm->vcpu.vcpu_id,
control->ghcb_gpa);
switch (ghcb_info) {
case GHCB_MSR_SEV_INFO_REQ:
set_ghcb_msr(svm, GHCB_MSR_SEV_INFO(GHCB_VERSION_MAX,
@ -1591,6 +1594,9 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
ret = -EINVAL;
}
trace_kvm_vmgexit_msr_protocol_exit(svm->vcpu.vcpu_id,
control->ghcb_gpa, ret);
return ret;
}

44
arch/x86/kvm/trace.h
View File

@ -1631,6 +1631,50 @@ TRACE_EVENT(kvm_vmgexit_exit,
__entry->info1, __entry->info2)
);
/*
* Tracepoint for the start of VMGEXIT MSR procotol processing
*/
TRACE_EVENT(kvm_vmgexit_msr_protocol_enter,
TP_PROTO(unsigned int vcpu_id, u64 ghcb_gpa),
TP_ARGS(vcpu_id, ghcb_gpa),
TP_STRUCT__entry(
__field(unsigned int, vcpu_id)
__field(u64, ghcb_gpa)
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->ghcb_gpa = ghcb_gpa;
),
TP_printk("vcpu %u, ghcb_gpa %016llx",
__entry->vcpu_id, __entry->ghcb_gpa)
);
/*
* Tracepoint for the end of VMGEXIT MSR procotol processing
*/
TRACE_EVENT(kvm_vmgexit_msr_protocol_exit,
TP_PROTO(unsigned int vcpu_id, u64 ghcb_gpa, int result),
TP_ARGS(vcpu_id, ghcb_gpa, result),
TP_STRUCT__entry(
__field(unsigned int, vcpu_id)
__field(u64, ghcb_gpa)
__field(int, result)
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->ghcb_gpa = ghcb_gpa;
__entry->result = result;
),
TP_printk("vcpu %u, ghcb_gpa %016llx, result %d",
__entry->vcpu_id, __entry->ghcb_gpa, __entry->result)
);
#endif /* _TRACE_KVM_H */
#undef TRACE_INCLUDE_PATH

2
arch/x86/kvm/x86.c
View File

@ -11316,3 +11316,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_update_request);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_exit);