linux-kernel - [PATCH 0/2] KVM support for Intel PMU v5 fixed function PMC bitmap

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Message-ID: <20230427095333.35038-1-abusse@amazon.com>
Date:   Thu, 27 Apr 2023 09:53:31 +0000
From:   Anselm Busse <abusse@...zon.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     <dwmw@...zon.co.uk>, <hborghor@...zon.de>, <sironi@...zon.de>,
        "Anselm Busse" <abusse@...zon.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/2] KVM support for Intel PMU v5 fixed function PMC bitmap

Starting with v5, the Intel PMU allows to indicate the available fixed
function PMCs not only through CPUID.0AH.EDX[4:0] but also through a
bit mask in CPUID.0AH.ECX. According to the SDM the OS can consider a
fix function PMC i supported for:

CPUID.0AH.ECX[i] || (CPUID.0AH.EDX[4:0] > i)

This behavior is already supported by the Intel PMU driver. However, KVM
support is missing. This patch series add the support by first
refactoring the tracking of available fixed function PMCs in KVM from a
number to a bitmap in the frist patch. The second patch populates the
bitmap accoring to the rule given by the SDM mentioned above.

Regards,
Anselm

Anselm Busse (2):
  KVM: vmx/pmu: Indicate available fixed function PMCs through a bitmap
  KVM: vmx/pmu: Add support for selected fixed vPMU enablement for PMU v5

 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/pmu.h              |  6 ++---
 arch/x86/kvm/svm/pmu.c          |  2 +-
 arch/x86/kvm/vmx/pmu_intel.c    | 40 ++++++++++++++++++++-------------
 4 files changed, 30 insertions(+), 20 deletions(-)

base-commit: 0cfd8703e7da687924371e9bc77a025bdeba9637
-- 
2.39.2

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