linux-kernel - [PATCH v8 19/26] KVM: x86: Use KVM-governed feature framework to track "SHSTK/IBT enabled"

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Message-Id: <20231221140239.4349-20-weijiang.yang@intel.com>
Date: Thu, 21 Dec 2023 09:02:32 -0500
From: Yang Weijiang <weijiang.yang@...el.com>
To: seanjc@...gle.com,
	pbonzini@...hat.com,
	dave.hansen@...el.com,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: peterz@...radead.org,
	chao.gao@...el.com,
	rick.p.edgecombe@...el.com,
	mlevitsk@...hat.com,
	john.allen@....com,
	weijiang.yang@...el.com
Subject: [PATCH v8 19/26] KVM: x86: Use KVM-governed feature framework to track "SHSTK/IBT enabled"

Use the governed feature framework to track whether X86_FEATURE_SHSTK
and X86_FEATURE_IBT features can be used by userspace and guest, i.e.,
the features can be used iff both KVM and guest CPUID can support them.

TODO: remove this patch once Sean's refactor to "KVM-governed" framework
is upstreamed. See the work here [*].

[*]: https://lore.kernel.org/all/20231110235528.1561679-1-seanjc@google.com/

Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/governed_features.h | 2 ++
 arch/x86/kvm/vmx/vmx.c           | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index ad463b1ed4e4..daf0c0a3e29c 100644
--- a/arch/x86/kvm/governed_features.h
+++ b/arch/x86/kvm/governed_features.h
@@ -17,6 +17,8 @@ KVM_GOVERNED_X86_FEATURE(PFTHRESHOLD)
 KVM_GOVERNED_X86_FEATURE(VGIF)
 KVM_GOVERNED_X86_FEATURE(VNMI)
 KVM_GOVERNED_X86_FEATURE(LAM)
+KVM_GOVERNED_X86_FEATURE(SHSTK)
+KVM_GOVERNED_X86_FEATURE(IBT)
 
 #undef KVM_GOVERNED_X86_FEATURE
 #undef KVM_GOVERNED_FEATURE
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b2f6bcf3bf9b..29a0fd3e83c5 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7764,6 +7764,8 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 
 	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_VMX);
 	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_LAM);
+	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_SHSTK);
+	kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_IBT);
 
 	vmx_setup_uret_msrs(vmx);
 
-- 
2.39.3