From 2e6b9bd49b702c4a52278e35202354b709021116 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 21 Jul 2023 13:18:58 -0700 Subject: [PATCH] KVM: SVM: Use "standard" stgi() helper when disabling SVM Now that kvm_rebooting is guaranteed to be true prior to disabling SVM in an emergency, use the existing stgi() helper instead of open coding STGI. In effect, eat faults on STGI if and only if kvm_rebooting==true. Link: https://lore.kernel.org/r/20230721201859.2307736-19-seanjc@google.com Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/svm.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 8d1b3c8..4785d78 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -588,17 +588,10 @@ static inline void kvm_cpu_svm_disable(void) rdmsrl(MSR_EFER, efer); if (efer & EFER_SVME) { /* - * Force GIF=1 prior to disabling SVM to ensure INIT and NMI - * aren't blocked, e.g. if a fatal error occurred between CLGI - * and STGI. Note, STGI may #UD if SVM is disabled from NMI - * context between reading EFER and executing STGI. In that - * case, GIF must already be set, otherwise the NMI would have - * been blocked, so just eat the fault. + * Force GIF=1 prior to disabling SVM, e.g. to ensure INIT and + * NMI aren't blocked. */ - asm_volatile_goto("1: stgi\n\t" - _ASM_EXTABLE(1b, %l[fault]) - ::: "memory" : fault); -fault: + stgi(); wrmsrl(MSR_EFER, efer & ~EFER_SVME); } } -- 2.7.4