[v1,0/8] PEBS enabling in KVM guest

Message

Luwei Kang Oct. 27, 2019, 11:11 p.m. UTC

Intel new hardware introduces some Precise Event-Based Sampling(PEBS)
extensions that output the PEBS record to Intel PT stream instead of
DS area. The PEBS record will be packaged in a specific format when
outputting to Intel PT. This patch set will enable PEBS functionality
in KVM Guest by PEBS output to Intel PT.

The patch 1 introduce a MSRs "base" parameter that use for get the
kvm_pmc structure by New MSR_RELOAD_FIXED_CTRx like get_gp_pmc()
function. The patch 2 implement the PEBS MSRs read/write emulation.
Patch 5/6/7 expose some capabilities(CPUID, MSRs) to KVM guest which
relate with PEBS feature. Patch 3 introduces "pebs" parameter to
allocate a perf event counter from host perf event framework.
The counter using for PEBS event should be disabled before VM-entry
in the previous platform, patch 4 skip this operation when PEBS is
enabled in KVM guest. Patch 8 has some code changes in native that to
make the aux_event only be needed for a non-kernel event(the couner
allocate by KVM is kernel event).

Luwei Kang (8):
  KVM: x86: Add base address parameter for get_fixed_pmc function
  KVM: x86: PEBS output to Intel PT MSRs emulation
  KVM: x86: Allocate performance counter for PEBS event
  KVM: x86: Aviod clear the PEBS counter when PEBS enabled in guest
  KVM: X86: Expose PDCM cpuid to guest
  KVM: X86: MSR_IA32_PERF_CAPABILITIES MSR emulation
  KVM: x86: Expose PEBS feature to guest
  perf/x86: Add event owner check when PEBS output to Intel PT

 arch/x86/events/core.c            |  3 +-
 arch/x86/events/intel/core.c      | 19 ++++++----
 arch/x86/events/perf_event.h      |  2 +-
 arch/x86/include/asm/kvm_host.h   |  7 ++++
 arch/x86/include/asm/msr-index.h  |  9 +++++
 arch/x86/include/asm/perf_event.h |  5 ++-
 arch/x86/kvm/cpuid.c              |  3 +-
 arch/x86/kvm/pmu.c                | 23 ++++++++----
 arch/x86/kvm/pmu.h                | 10 ++---
 arch/x86/kvm/pmu_amd.c            |  2 +-
 arch/x86/kvm/svm.c                | 12 ++++++
 arch/x86/kvm/vmx/capabilities.h   | 25 +++++++++++++
 arch/x86/kvm/vmx/pmu_intel.c      | 79 +++++++++++++++++++++++++++++++++++----
 arch/x86/kvm/vmx/vmx.c            | 19 +++++++++-
 arch/x86/kvm/x86.c                | 22 ++++++++---
 include/linux/perf_event.h        |  1 +
 kernel/events/core.c              |  2 +-
 17 files changed, 201 insertions(+), 42 deletions(-)