KVM: SVM: Do not allow instruction emulation under SEV-ES

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 <[email protected]> Message-Id: <f6355ea3024fda0a3eb5eb99c6b62dca10d792bd.1607620209.git.thomas.lendacky@amd.com> Signed-off-by: Paolo Bonzini <[email protected]>
jangid · Dec 15, 2020 · bc624d9 · bc624d9
1 parent 8d4846b
commit bc624d9
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
@@ -4157,6 +4157,12 @@ 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.
 	 *