linux-kernel - [PATCH v3 08/27] KVM: x86: Use KVM-governed feature framework to track "FRED enabled"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241001050110.3643764-9-xin@zytor.com>
Date: Mon, 30 Sep 2024 22:00:51 -0700
From: "Xin Li (Intel)" <xin@...or.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Cc: seanjc@...gle.com, pbonzini@...hat.com, corbet@....net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, luto@...nel.org, peterz@...radead.org,
        andrew.cooper3@...rix.com, xin@...or.com
Subject: [PATCH v3 08/27] KVM: x86: Use KVM-governed feature framework to track "FRED enabled"

From: Xin Li <xin3.li@...el.com>

Track "FRED enabled" via a governed feature flag to avoid the guest
CPUID lookups at runtime.

Suggested-by: Chao Gao <chao.gao@...el.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
Signed-off-by: Xin Li (Intel) <xin@...or.com>
Tested-by: Shan Kang <shan.kang@...el.com>
---
 arch/x86/kvm/governed_features.h | 1 +
 arch/x86/kvm/vmx/vmx.c           | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index ad463b1ed4e4..507ca73e52e9 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(FRED)
 
 #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 fee0df93e07c..9acc9661fdb2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7893,6 +7893,7 @@ 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_FRED);
 
 	vmx_setup_uret_msrs(vmx);
 
-- 
2.46.2