[v2,0/7] Use static_call for kvm_pmu_ops

Message

Like Xu Nov. 8, 2021, 11:10 a.m. UTC

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/[e-mail]/

[1] https://lore.kernel.org/lkml/[e-mail]/
[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