linux-kernel - [PATCH v15 27/41] KVM: x86: SVM: Update dump_vmcb with shadow stack save area additions

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Message-ID: <20250912232319.429659-28-seanjc@google.com>
Date: Fri, 12 Sep 2025 16:23:05 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Tom Lendacky <thomas.lendacky@....com>, Mathias Krause <minipli@...ecurity.net>, 
	John Allen <john.allen@....com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, 
	Chao Gao <chao.gao@...el.com>, Maxim Levitsky <mlevitsk@...hat.com>, 
	Xiaoyao Li <xiaoyao.li@...el.com>, Zhang Yi Z <yi.z.zhang@...ux.intel.com>
Subject: [PATCH v15 27/41] KVM: x86: SVM: Update dump_vmcb with shadow stack
 save area additions

From: John Allen <john.allen@....com>

Add shadow stack VMCB fields to dump_vmcb. PL0_SSP, PL1_SSP, PL2_SSP,
PL3_SSP, and U_CET are part of the SEV-ES save area and are encrypted,
but can be decrypted and dumped if the guest policy allows debugging.

Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
Signed-off-by: John Allen <john.allen@....com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 0c0115b52e5c..c0a16481b9c3 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3410,6 +3410,10 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
 	       "rip:", save->rip, "rflags:", save->rflags);
 	pr_err("%-15s %016llx %-13s %016llx\n",
 	       "rsp:", save->rsp, "rax:", save->rax);
+	pr_err("%-15s %016llx %-13s %016llx\n",
+	       "s_cet:", save->s_cet, "ssp:", save->ssp);
+	pr_err("%-15s %016llx\n",
+	       "isst_addr:", save->isst_addr);
 	pr_err("%-15s %016llx %-13s %016llx\n",
 	       "star:", save01->star, "lstar:", save01->lstar);
 	pr_err("%-15s %016llx %-13s %016llx\n",
@@ -3434,6 +3438,13 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
 		pr_err("%-15s %016llx\n",
 		       "sev_features", vmsa->sev_features);
 
+		pr_err("%-15s %016llx %-13s %016llx\n",
+		       "pl0_ssp:", vmsa->pl0_ssp, "pl1_ssp:", vmsa->pl1_ssp);
+		pr_err("%-15s %016llx %-13s %016llx\n",
+		       "pl2_ssp:", vmsa->pl2_ssp, "pl3_ssp:", vmsa->pl3_ssp);
+		pr_err("%-15s %016llx\n",
+		       "u_cet:", vmsa->u_cet);
+
 		pr_err("%-15s %016llx %-13s %016llx\n",
 		       "rax:", vmsa->rax, "rbx:", vmsa->rbx);
 		pr_err("%-15s %016llx %-13s %016llx\n",
-- 
2.51.0.384.g4c02a37b29-goog