linux-kernel - [PATCH v15 30/41] KVM: SVM: Enable shadow stack virtualization for SVM

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Message-ID: <20250912232319.429659-31-seanjc@google.com>
Date: Fri, 12 Sep 2025 16:23:08 -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 30/41] KVM: SVM: Enable shadow stack virtualization for SVM

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

Remove the explicit clearing of shadow stack CPU capabilities.

Reviewed-by: Chao Gao <chao.gao@...el.com>
Signed-off-by: John Allen <john.allen@....com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index dc4d34e6af33..f2e96cf72938 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -5264,10 +5264,7 @@ static __init void svm_set_cpu_caps(void)
 	kvm_set_cpu_caps();
 
 	kvm_caps.supported_perf_cap = 0;
-	kvm_caps.supported_xss = 0;
 
-	/* KVM doesn't yet support CET virtualization for SVM. */
-	kvm_cpu_cap_clear(X86_FEATURE_SHSTK);
 	kvm_cpu_cap_clear(X86_FEATURE_IBT);
 
 	/* CPUID 0x80000001 and 0x8000000A (SVM features) */
-- 
2.51.0.384.g4c02a37b29-goog