linux-kernel - [PATCH v3 2/4] KVM: x86: add X86_FEATURE_LA57 to governed

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Message-Id: <20240815123349.729017-3-mlevitsk@redhat.com>
Date: Thu, 15 Aug 2024 15:33:47 +0300
From: Maxim Levitsky <mlevitsk@...hat.com>
To: kvm@...r.kernel.org
Cc: Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v3 2/4] KVM: x86: add X86_FEATURE_LA57 to governed_features

Guest support for X86_FEATURE_LA57 will need to be tested to determine
canonical width check for nested VMX VM entries.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/cpuid.c             | 2 ++
 arch/x86/kvm/governed_features.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2617be544480..1a2d3fbe9a59 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -373,6 +373,8 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 	if (allow_gbpages)
 		kvm_governed_feature_set(vcpu, X86_FEATURE_GBPAGES);
 
+	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_LA57);
+
 	best = kvm_find_cpuid_entry(vcpu, 1);
 	if (best && apic) {
 		if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER))
diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index ad463b1ed4e4..475171f2fd49 100644
--- a/arch/x86/kvm/governed_features.h
+++ b/arch/x86/kvm/governed_features.h
@@ -17,6 +17,7 @@ KVM_GOVERNED_X86_FEATURE(PFTHRESHOLD)
 KVM_GOVERNED_X86_FEATURE(VGIF)
 KVM_GOVERNED_X86_FEATURE(VNMI)
 KVM_GOVERNED_X86_FEATURE(LAM)
+KVM_GOVERNED_X86_FEATURE(LA57)
 
 #undef KVM_GOVERNED_X86_FEATURE
 #undef KVM_GOVERNED_FEATURE
-- 
2.40.1