KVM: Add instruction-set-specific exit qualifications to kvm_exit trace

The exit reason alone is insufficient to understand exactly why an exit
occured; add ISA-specific trace parameters for additional information.

Because fetching these parameters is expensive on vmx, and because these
parameters are fetched even if tracing is disabled, we fetch the
parameters via a callback instead of as traditional trace arguments.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 78a23086e16d..28274cf307ba 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2974,6 +2974,14 @@ void dump_vmcb(struct kvm_vcpu *vcpu)
 
 }
 
+static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
+{
+        struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
+
+        *info1 = control->exit_info_1;
+        *info2 = control->exit_info_2;
+}
+
 static int handle_exit(struct kvm_vcpu *vcpu)
 {
         struct vcpu_svm *svm = to_svm(vcpu);
@@ -3684,7 +3692,9 @@ static struct kvm_x86_ops svm_x86_ops = {
         .get_tdp_level = get_npt_level,
         .get_mt_mask = svm_get_mt_mask,
 
+        .get_exit_info = svm_get_exit_info,
         .exit_reasons_str = svm_exit_reasons_str,
+
         .get_lpage_level = svm_get_lpage_level,
 
         .cpuid_update = svm_cpuid_update,