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authorSean Christopherson <seanjc@google.com>2022-01-20 04:07:16 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2022-01-26 20:15:01 +0300
commit132627c64d94b1561ba5a444824e46c9f84c3d5b (patch)
tree189b2dd9e352a383e801f0cfb717e1c1faaf4b8a /arch
parent4d31d9eff244e2631f028d658979ccbbdbcb423b (diff)
downloadlinux-132627c64d94b1561ba5a444824e46c9f84c3d5b.tar.xz
KVM: SVM: WARN if KVM attempts emulation on #UD or #GP for SEV guests
WARN if KVM attempts to emulate in response to #UD or #GP for SEV guests, i.e. if KVM intercepts #UD or #GP, as emulation on any fault except #NPF is impossible since KVM cannot read guest private memory to get the code stream, and the CPU's DecodeAssists feature only provides the instruction bytes on #NPF. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Message-Id: <20220120010719.711476-7-seanjc@google.com> [Warn on EMULTYPE_TRAP_UD_FORCED according to Liam Merwick's review. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/svm/svm.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 115743e250bb..85bbfba1fa07 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4268,6 +4268,11 @@ static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
if (!sev_guest(vcpu->kvm))
return true;
+ /* #UD and #GP should never be intercepted for SEV guests. */
+ WARN_ON_ONCE(emul_type & (EMULTYPE_TRAP_UD |
+ EMULTYPE_TRAP_UD_FORCED |
+ EMULTYPE_VMWARE_GP));
+
/*
* Emulation is impossible for SEV-ES guests as KVM doesn't have access
* to guest register state.