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

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Message-ID: <20240423162144.1780159-2-michael.roth@amd.com>
Date: Tue, 23 Apr 2024 11:21:39 -0500
From: Michael Roth <michael.roth@....com>
To: <kvm@...r.kernel.org>
CC: <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
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Subject: [PATCH v14 24/22] [SQUASH] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT

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@....com>
---
 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