linux-kernel - [PATCH v2 0/7] Use static_call for kvm_pmu

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Message-Id: <20211108111032.24457-1-likexu@tencent.com>
Date:   Mon,  8 Nov 2021 19:10:25 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/7] Use static_call for kvm_pmu_ops

Hi,

This is a successor to a previous patch set from Jason Baron. Let's convert
kvm_pmu_ops to use static_call. Shows good performance gains for
a typical perf use case [2] in the guest (results in patch 3/3).

V1 -> V2 Changelog:
- Export kvm_pmu_is_valid_msr() for nVMX [Sean]
- Land memcpy() above kvm_ops_static_call_update() [Sean]
- Move the pmu_ops to kvm_x86_init_ops and tagged as __initdata. [Sean]
- Move the kvm_ops_static_call_update() to x86.c [Sean]
- Drop kvm_pmu_ops_static_call_update() [Sean]
- Fix WARNING that macros KVM_X86_OP should not use a trailing semicolon

Previous:
https://lore.kernel.org/kvm/20211103070310.43380-1-likexu@tencent.com/

[1] https://lore.kernel.org/lkml/cover.1610680941.git.jbaron@akamai.com/
[2] perf record -e branch-instructions -e branch-misses \
-e cache-misses -e cache-references -e cpu-cycles \
-e instructions ./workload

Thanks,

Like Xu (7):
  KVM: x86: Export kvm_pmu_is_valid_msr() for nVMX
  KVM: x86: Fix WARNING that macros should not use a trailing semicolon
  KVM: x86: Move kvm_ops_static_call_update() to x86.c
  KVM: x86: Copy kvm_pmu_ops by value to eliminate layer of indirection
  KVM: x86: Move .pmu_ops to kvm_x86_init_ops and tagged as __initdata
  KVM: x86: Introduce definitions to support static calls for
    kvm_pmu_ops
  KVM: x86: Use static calls to reduce kvm_pmu_ops overhead

 arch/x86/include/asm/kvm-x86-ops.h     | 218 ++++++++++++-------------
 arch/x86/include/asm/kvm-x86-pmu-ops.h |  32 ++++
 arch/x86/include/asm/kvm_host.h        |  14 +-
 arch/x86/kvm/pmu.c                     |  46 +++---
 arch/x86/kvm/pmu.h                     |   9 +-
 arch/x86/kvm/svm/pmu.c                 |   2 +-
 arch/x86/kvm/svm/svm.c                 |   2 +-
 arch/x86/kvm/vmx/nested.c              |   2 +-
 arch/x86/kvm/vmx/pmu_intel.c           |   2 +-
 arch/x86/kvm/vmx/vmx.c                 |   2 +-
 arch/x86/kvm/x86.c                     |  16 +-
 11 files changed, 199 insertions(+), 146 deletions(-)
 create mode 100644 arch/x86/include/asm/kvm-x86-pmu-ops.h

-- 
2.33.0