[PATCH 2/2] KVM: X86: Add pv tlb shootdown tracepoint

[Wanpeng Li]

From: Wanpeng Li <wanpen...@tencent.com>

Add pv tlb shootdown tracepoint.

Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Radim Krčmář <rkrc...@redhat.com>
Signed-off-by: Wanpeng Li <wanpen...@tencent.com>
---
 arch/x86/kvm/trace.h | 19 +++++++++++++++++++
 arch/x86/kvm/x86.c   |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index ce6ee34..84f32d3 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1487,6 +1487,25 @@ TRACE_EVENT(kvm_pv_send_ipi,
        TP_printk("vector %d min 0x%x ipi_bitmap_low 0x%lx ipi_bitmap_high 
0x%lx",
                  __entry->vector, __entry->min, __entry->ipi_bitmap_low, 
__entry->ipi_bitmap_high)
 );
+
+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
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bc1688e..a7a0514 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2458,6 +2458,8 @@ 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);
 
-- 
2.7.4