KVM: trace guest fpu loads and unloads

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 27af6e3..3b90298 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5292,6 +5292,7 @@ void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
        vcpu->guest_fpu_loaded = 1;
        kvm_fx_save(&vcpu->arch.host_fx_image);
        kvm_fx_restore(&vcpu->arch.guest_fx_image);
+       trace_kvm_fpu(1);
 }
 
 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
@@ -5304,6 +5305,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
        kvm_fx_restore(&vcpu->arch.host_fx_image);
        ++vcpu->stat.fpu_reload;
        set_bit(KVM_REQ_DEACTIVATE_FPU, &vcpu->requests);
+       trace_kvm_fpu(0);
 }
 
 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index dbe1084..8abdc12 100644 (file)
--- a/include/trace/events/kvm.h
+++ b/include/trace/events/kvm.h
@@ -145,6 +145,25 @@ TRACE_EVENT(kvm_mmio,
                  __entry->len, __entry->gpa, __entry->val)
 );
 
+#define kvm_fpu_load_symbol    \
+       {0, "unload"},          \
+       {1, "load"}
+
+TRACE_EVENT(kvm_fpu,
+       TP_PROTO(int load),
+       TP_ARGS(load),
+
+       TP_STRUCT__entry(
+               __field(        u32,            load            )
+       ),
+
+       TP_fast_assign(
+               __entry->load           = load;
+       ),
+
+       TP_printk("%s", __print_symbolic(__entry->load, kvm_fpu_load_symbol))
+);
+
 #endif /* _TRACE_KVM_MAIN_H */
 
 /* This part must be outside protection */