linux-kernel - [RFC PATCH 10/22] KVM: x86: Make APERFMPERF a governed feature

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Message-ID: <20241121185315.3416855-11-mizhang@google.com>
Date: Thu, 21 Nov 2024 18:53:02 +0000
From: Mingwei Zhang <mizhang@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Huang Rui <ray.huang@....com>, "Gautham R. Shenoy" <gautham.shenoy@....com>, 
	Mario Limonciello <mario.limonciello@....com>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Viresh Kumar <viresh.kumar@...aro.org>, 
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Len Brown <lenb@...nel.org>
Cc: "H. Peter Anvin" <hpa@...or.com>, Perry Yuan <perry.yuan@....com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	Jim Mattson <jmattson@...gle.com>, Mingwei Zhang <mizhang@...gle.com>
Subject: [RFC PATCH 10/22] KVM: x86: Make APERFMPERF a governed feature

From: Jim Mattson <jmattson@...gle.com>

KVM must verify both host support and guest CPUID enumeration before
enabling guest access to APERFMPERF.

This verification is deferred until the implementation of guest
APERFMPERF is complete.

This declaration enables "guest_can_use(vcpu,
X86_FEATURE_APERFMPERF)". Otherwise, that expression results in a
compile-time error.

Signed-off-by: Jim Mattson <jmattson@...gle.com>
Reviewed-by: Mingwei Zhang <mizhang@...gle.com>
Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 arch/x86/kvm/governed_features.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index ad463b1ed4e4a..fa77d655d2355 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(APERFMPERF)
 
 #undef KVM_GOVERNED_X86_FEATURE
 #undef KVM_GOVERNED_FEATURE
-- 
2.47.0.371.ga323438b13-goog