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KVM: X86: Add pv tlb shootdown tracepoint 

Add pv tlb shootdown tracepoint.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2019-08-05 10:03:24 +08:00 committed by Paolo Bonzini
parent 92735b1b33
commit b382f44e98
2 changed files with 21 additions and 0 deletions
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19
arch/x86/kvm/trace.h
View File

@ -1462,6 +1462,25 @@ TRACE_EVENT(kvm_hv_send_ipi_ex,
__entry->vector, __entry->format,
__entry->valid_bank_mask)
);
TRACE_EVENT(kvm_pv_tlb_flush,
TP_PROTO(unsigned int vcpu_id, bool need_flush_tlb),
TP_ARGS(vcpu_id, need_flush_tlb),
TP_STRUCT__entry(
__field( unsigned int, vcpu_id )
__field( bool, need_flush_tlb )
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->need_flush_tlb = need_flush_tlb;
),
TP_printk("vcpu %u need_flush_tlb %s", __entry->vcpu_id,
__entry->need_flush_tlb ? "true" : "false")
);
#endif /* _TRACE_KVM_H */
#undef TRACE_INCLUDE_PATH

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

@ -2459,6 +2459,8 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
* Doing a TLB flush here, on the guest's behalf, can avoid
* expensive IPIs.
*/
trace_kvm_pv_tlb_flush(vcpu->vcpu_id,
vcpu->arch.st.steal.preempted & KVM_VCPU_FLUSH_TLB);
if (xchg(&vcpu->arch.st.steal.preempted, 0) & KVM_VCPU_FLUSH_TLB)
kvm_vcpu_flush_tlb(vcpu, false);