[PATCH v14 24/22] [SQUASH] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT

[Michael Roth]

Terminate if an non-SNP guest attempts to issue a Page State Change
GHCB request; this is only allowed for SNP.

Signed-off-by: Michael Roth <michael.roth@xxxxxxx>
---
 arch/x86/kvm/svm/sev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 088eca85a6ac..0d8fbd5e25fe 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -3996,6 +3996,9 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
 		break;
 	}
 	case GHCB_MSR_PSC_REQ:
+		if (!sev_snp_guest(vcpu->kvm))
+			goto out_terminate;
+
 		ret = snp_begin_psc_msr(vcpu, control->ghcb_gpa);
 		break;
 	case GHCB_MSR_TERM_REQ: {
-- 
2.25.1