[v6,00/12] Guest LBR Enabling

Message

Wang, Wei W June 6, 2019, 7:02 a.m. UTC

Last Branch Recording (LBR) is a performance monitor unit (PMU) feature
on Intel CPUs that captures branch related info. This patch series enables
this feature to KVM guests.

Here is a conclusion of the fundamental methods that we use:
1) the LBR feature is enabled per guest via QEMU setting of
   KVM_CAP_X86_GUEST_LBR;
2) the LBR stack is passed through to the guest for direct accesses after
   the guest's first access to any of the lbr related MSRs;
3) the host will help save/resotre the LBR stack when the vCPU is
   scheduled out/in.

ChangeLog:
    - perf/x86:
        - Patch 7:
                - define "no counter" as a new PERF_EV cap and keep it
                  used in the kernel, instead of esposing it in the user
                  ABI (if defined in perf_event_attr)
                - add a new API, perf_event_create, which can be used to
                  create a perf event without counter assignment (e.g.
                  a perf event simply to get the perf core's help of
                  switching lbr stack on thread switching, please see
                  patch 8)
    - KVM/vPMU:
	- Patch 8: use perf_event_create to create a perf event without
                   the need of a perf counter
	- Patch 12: set the GLOBAL_STATUS_COUNTERS_FROZEN bit when
                   injecting a vPMI.
previous:
	https://lkml.org/lkml/2019/2/14/210

Like Xu (1):
  KVM/x86/vPMU: Add APIs to support host save/restore the guest lbr
    stack

Wei Wang (11):
  perf/x86: fix the variable type of the LBR MSRs
  perf/x86: add a function to get the lbr stack
  KVM/x86: KVM_CAP_X86_GUEST_LBR
  KVM/x86: intel_pmu_lbr_enable
  KVM/x86/vPMU: tweak kvm_pmu_get_msr
  KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest
  perf/x86: no counter allocation support
  perf/x86: save/restore LBR_SELECT on vCPU switching
  KVM/x86/lbr: lazy save the guest lbr stack
  KVM/x86: remove the common handling of the debugctl msr
  KVM/VMX/vPMU: support to report GLOBAL_STATUS_LBRS_FROZEN

 arch/x86/events/core.c            |  12 ++
 arch/x86/events/intel/lbr.c       |  43 ++++-
 arch/x86/events/perf_event.h      |   6 +-
 arch/x86/include/asm/kvm_host.h   |   5 +
 arch/x86/include/asm/perf_event.h |  16 ++
 arch/x86/kvm/cpuid.c              |   2 +-
 arch/x86/kvm/cpuid.h              |   8 +
 arch/x86/kvm/pmu.c                |  29 ++-
 arch/x86/kvm/pmu.h                |  12 +-
 arch/x86/kvm/pmu_amd.c            |   7 +-
 arch/x86/kvm/vmx/pmu_intel.c      | 397 +++++++++++++++++++++++++++++++++++++-
 arch/x86/kvm/vmx/vmx.c            |   4 +-
 arch/x86/kvm/vmx/vmx.h            |   2 +
 arch/x86/kvm/x86.c                |  32 +--
 include/linux/perf_event.h        |  13 ++
 include/uapi/linux/kvm.h          |   1 +
 kernel/events/core.c              |  37 ++--
 17 files changed, 574 insertions(+), 52 deletions(-)