linux-kernel - [RFC PATCH 7/7] KVM: SVM: Add CET features to supported

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Date:   Wed, 12 Oct 2022 20:39:10 +0000
From:   John Allen <john.allen@....com>
To:     <kvm@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <pbonzini@...hat.com>,
        <weijiang.yang@...el.com>, <rick.p.edgecombe@...el.com>,
        <seanjc@...gle.com>, <x86@...nel.org>, <thomas.lendacky@....com>,
        John Allen <john.allen@....com>
Subject: [RFC PATCH 7/7] KVM: SVM: Add CET features to supported_xss

If the CPU supports CET, add CET XSAVES feature bits to the
supported_xss mask.

Signed-off-by: John Allen <john.allen@....com>
---
 arch/x86/kvm/svm/svm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b474c7e57139..b815865ad0fb 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -5026,6 +5026,11 @@ static __init void svm_set_cpu_caps(void)
 	    boot_cpu_has(X86_FEATURE_AMD_SSBD))
 		kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
 
+	if (kvm_cpu_cap_has(X86_FEATURE_SHSTK)) {
+		kvm_caps.supported_xss |= XFEATURE_MASK_CET_USER |
+					  XFEATURE_MASK_CET_KERNEL;
+	}
+
 	/* AMD PMU PERFCTR_CORE CPUID */
 	if (enable_pmu && boot_cpu_has(X86_FEATURE_PERFCTR_CORE))
 		kvm_cpu_cap_set(X86_FEATURE_PERFCTR_CORE);
-- 
2.34.3