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| author |   Sean Christopherson <seanjc@google.com> | 2022-01-20 01:07:16 +0000 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-01-26 12:15:01 -0500 |
| commit | 132627c64d94b1561ba5a444824e46c9f84c3d5b (patch) | |
| tree | 189b2dd9e352a383e801f0cfb717e1c1faaf4b8a /arch | |
| parent | KVM: x86: Pass emulation type to can_emulate_instruction() (diff) | |
| download | wireguard-linux-132627c64d94b1561ba5a444824e46c9f84c3d5b.tar.xz wireguard-linux-132627c64d94b1561ba5a444824e46c9f84c3d5b.zip | |
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.c | 5 |
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. |