Re: [PATCH v4 00/10] perf/x86: Don't write PEBS_ENABLED on KVM transitions

[Peter Zijlstra]

On Mon, Sep 21, 2026 at 12:14:08PM -0700, Sean Christopherson wrote:

> Sean Christopherson (10):
>   perf/x86/intel: Ensure guest PEBS path doesn't set unwanted
>     PERF_GLOBAL_CTRL bits
>   perf/x86/intel: Don't write PEBS_ENABLED on host<=>guest xfers if CPU
>     has isolation
>   perf/x86/intel: Don't context switch DS_AREA (and PEBS config) if PEBS
>     is unused
>   perf/x86/intel: Make @data a mandatory param for
>     intel_guest_get_msrs()
>   perf/x86/intel: Invert names of intel_ctrl_{guest,host}_mask
>   perf/x86: KVM: Have perf define a dedicated struct for getting guest
>     PEBS data
>   perf/x86/intel: KVM: Handle cross-mapped PEBS PMCs entirely within KVM
>   KVM: VMX: Drop a redundant pmu->global_ctrl check when processing
>     pebs_enable
>   KVM: VMX: Only tell perf to enable PEBS counters for fully enabled
>     PMCs
>   perf/x86/intel: Check only PMC bits in PEBS_ENABLED when detecting
>     host PEBS usage
> 
>  arch/x86/events/core.c            |  5 +-
>  arch/x86/events/intel/core.c      | 94 +++++++++++++++++++------------
>  arch/x86/events/intel/lbr.c       |  2 +-
>  arch/x86/events/perf_event.h      |  7 ++-
>  arch/x86/include/asm/kvm_host.h   |  9 ---
>  arch/x86/include/asm/perf_event.h | 11 +++-
>  arch/x86/kvm/vmx/pmu_intel.c      | 28 ++++++---
>  arch/x86/kvm/vmx/vmx.c            | 10 ++--
>  arch/x86/kvm/vmx/vmx.h            | 15 ++++-
>  9 files changed, 115 insertions(+), 66 deletions(-)

Thanks, split in two and queued in perf/urgent and perf/core. I'll push
to tip in a day or so unless the robots scream.