Add a build-time assertiont that Hyper-V's "enlightened" exit code is that, same as the AMD-defined "Reserved for Host" exit code, mostly to help readers connect the dots and understand why synthesizing a software-defined exit code is safe/ok.
Signed-off-by: Sean Christopherson <[email protected]> --- arch/x86/kvm/svm/hyperv.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/svm/hyperv.c b/arch/x86/kvm/svm/hyperv.c index 3ec580d687f5..4f24dcb45116 100644 --- a/arch/x86/kvm/svm/hyperv.c +++ b/arch/x86/kvm/svm/hyperv.c @@ -10,6 +10,12 @@ void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); + /* + * The exit code used by Hyper-V for software-defined exits is reserved + * by AMD specifically for such use cases. + */ + BUILD_BUG_ON(HV_SVM_EXITCODE_ENL != SVM_EXIT_SW); + svm->vmcb->control.exit_code = HV_SVM_EXITCODE_ENL; svm->vmcb->control.exit_info_1 = HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH; svm->vmcb->control.exit_info_2 = 0; -- 2.52.0.351.gbe84eed79e-goog
