linux-kernel - [PATCH v14 25/22] [SQUASH] KVM: SEV: Add support to handle Page State Change VMGEXIT

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Message-ID: <20240423162144.1780159-3-michael.roth@amd.com>
Date: Tue, 23 Apr 2024 11:21:40 -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 25/22] [SQUASH] KVM: SEV: Add support to handle Page State Change VMGEXIT

Report an error to guest if non-SNP attempts to issue GHCB-based Page
State Change.

Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/kvm/svm/sev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0d8fbd5e25fe..c00081248ffe 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -3289,7 +3289,11 @@ static int sev_es_validate_vmgexit(struct vcpu_svm *svm)
 	case SVM_VMGEXIT_AP_JUMP_TABLE:
 	case SVM_VMGEXIT_UNSUPPORTED_EVENT:
 	case SVM_VMGEXIT_HV_FEATURES:
+		break;
 	case SVM_VMGEXIT_PSC:
+		if (!sev_snp_guest(vcpu->kvm))
+			goto vmgexit_err;
+		break;
 	case SVM_VMGEXIT_TERM_REQUEST:
 	case SVM_VMGEXIT_GUEST_REQUEST:
 	case SVM_VMGEXIT_EXT_GUEST_REQUEST:
-- 
2.25.1