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KVM: x86: Add RIP to the kvm_entry, i.e. VM-Enter, tracepoint

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Add RIP to the kvm_entry tracepoint to help debug if the kvm_exit
tracepoint is disabled or if VM-Enter fails, in which case the kvm_exit
tracepoint won't be hit.

Read RIP from within the tracepoint itself to avoid a potential VMREAD
and retpoline if the guest's RIP isn't available.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200923201349.16097-2-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-09-23 13:13:43 -07:00 committed by Paolo Bonzini
parent 138534a810
commit b2d522552c
2 changed files with 7 additions and 5 deletions
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10
arch/x86/kvm/trace.h
View File

@ -15,18 +15,20 @@
* Tracepoint for guest mode entry.
*/
TRACE_EVENT(kvm_entry,
TP_PROTO(unsigned int vcpu_id),
TP_ARGS(vcpu_id),
TP_PROTO(struct kvm_vcpu *vcpu),
TP_ARGS(vcpu),
TP_STRUCT__entry(
__field( unsigned int, vcpu_id )
__field( unsigned long, rip )
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->vcpu_id = vcpu->vcpu_id;
__entry->rip = kvm_rip_read(vcpu);
),
TP_printk("vcpu %u", __entry->vcpu_id)
TP_printk("vcpu %u, rip 0x%lx", __entry->vcpu_id, __entry->rip)
);
/*

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

@ -8563,7 +8563,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_x86_ops.request_immediate_exit(vcpu);
}
trace_kvm_entry(vcpu->vcpu_id);
trace_kvm_entry(vcpu);
fpregs_assert_state_consistent();
if (test_thread_flag(TIF_NEED_FPU_LOAD))