On Mon, Jul 20, 2020 at 06:52:15PM +0200, Vitaly Kuznetsov wrote: > Sean Christopherson <sean.j.christopherson@xxxxxxxxx> writes: > > +TRACE_EVENT_KVM_EXIT(kvm_nested_vmexit); > > > > /* > > * Tracepoint for #VMEXIT reinjected to the guest > > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c > > index fc70644b916ca..f437d99f4db09 100644 > > --- a/arch/x86/kvm/vmx/nested.c > > +++ b/arch/x86/kvm/vmx/nested.c > > @@ -5912,10 +5912,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu) > > exit_intr_info = vmx_get_intr_info(vcpu); > > exit_qual = vmx_get_exit_qual(vcpu); > > > > - trace_kvm_nested_vmexit(vcpu, exit_reason, exit_qual, > > - vmx->idt_vectoring_info, exit_intr_info, > > - vmcs_read32(VM_EXIT_INTR_ERROR_CODE), > > - KVM_ISA_VMX); > > + trace_kvm_nested_vmexit(exit_reason, vcpu, KVM_ISA_VMX); > > > > /* If L0 (KVM) wants the exit, it trumps L1's desires. */ > > if (nested_vmx_l0_wants_exit(vcpu, exit_reason)) > > With so many lines removed I'm almost in love with the patch! However, > when testing on SVM (unrelated?) my trace log looks a bit ugly: > > <...>-315119 [010] 3733.092646: kvm_nested_vmexit: CAN'T FIND FIELD "rip"<CANT FIND FIELD exit_code>vcpu 0 reason npf rip 0x400433 info1 0x0000000200000006 info2 0x0000000000641000 intr_info 0x00000000 error_code 0x00000000 > <...>-315119 [010] 3733.092655: kvm_nested_vmexit: CAN'T FIND FIELD "rip"<CANT FIND FIELD exit_code>vcpu 0 reason npf rip 0x400433 info1 0x0000000100000014 info2 0x0000000000400000 intr_info 0x00000000 error_code 0x00000000 > > ... > > but after staring at this for some time I still don't see where this > comes from :-( ... but reverting this commit helps: The CAN'T FIND FIELD blurb comes from tools/lib/traceevent/event-parse.c. I assume you are using tooling of some form to generate the trace, i.e. the issue doesn't show up in /sys/kernel/debug/tracing/trace. If that's the case, this is more or less ABI breakage :-( > qemu-system-x86-9928 [022] 379.260656: kvm_nested_vmexit: rip 400433 reason EXIT_NPF info1 200000006 info2 641000 int_info 0 int_info_err 0 > qemu-system-x86-9928 [022] 379.260666: kvm_nested_vmexit: rip 400433 reason EXIT_NPF info1 100000014 info2 400000 int_info 0 int_info_err 0 > > -- > Vitaly >
