Messages in this thread Patch in this message | | | From | Tom Lendacky <> | Subject | [RFC PATCH v2 08/33] KVM: SVM: Do not allow instruction emulation under SEV-ES | Date | Fri, 2 Oct 2020 12:02:32 -0500 |
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From: Tom Lendacky <thomas.lendacky@amd.com>
When a guest is running as an SEV-ES guest, it is not possible to emulate instructions. Add support to prevent instruction emulation.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> --- arch/x86/kvm/svm/svm.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 5270735bbdd8..51041eb9758a 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4201,6 +4201,12 @@ static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, void *insn, int i bool smep, smap, is_user; unsigned long cr4; + /* + * When the guest is an SEV-ES guest, emulation is not possible. + */ + if (sev_es_guest(vcpu->kvm)) + return false; + /* * Detect and workaround Errata 1096 Fam_17h_00_0Fh. * -- 2.28.0
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