kvm: add tracepoint for fast mmio

Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 4eae7c3..ce4abe3 100644 (file)
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -129,6 +129,24 @@ TRACE_EVENT(kvm_pio,
 );
 
 /*
+ * Tracepoint for fast mmio.
+ */
+TRACE_EVENT(kvm_fast_mmio,
+       TP_PROTO(u64 gpa),
+       TP_ARGS(gpa),
+
+       TP_STRUCT__entry(
+               __field(u64,    gpa)
+       ),
+
+       TP_fast_assign(
+               __entry->gpa            = gpa;
+       ),
+
+       TP_printk("fast mmio at gpa 0x%llx", __entry->gpa)
+);
+
+/*
  * Tracepoint for cpuid.
  */
 TRACE_EVENT(kvm_cpuid,

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6ee0dc6..324b09f 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5756,6 +5756,7 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
        gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
        if (!kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {
                skip_emulated_instruction(vcpu);
+               trace_kvm_fast_mmio(gpa);
                return 1;
        }
 

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8b97c54..b90ad01 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8070,6 +8070,7 @@ bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);