Re: [PATCH v4 00/38] Mediated vPMU 4.0 for x86

[Sean Christopherson <seanjc@google.com>]

On Mon, Mar 24, 2025, Mingwei Zhang wrote:
> Dapeng Mi (18):
>   KVM: x86/pmu: Introduce enable_mediated_pmu global parameter
>   KVM: x86/pmu: Check PMU cpuid configuration from user space
>   KVM: x86: Rename vmx_vmentry/vmexit_ctrl() helpers
>   KVM: x86/pmu: Add perf_capabilities field in struct kvm_host_values{}
>   KVM: x86/pmu: Move PMU_CAP_{FW_WRITES,LBR_FMT} into msr-index.h header
>   KVM: VMX: Add macros to wrap around
>     {secondary,tertiary}_exec_controls_changebit()
>   KVM: x86/pmu: Check if mediated vPMU can intercept rdpmc
>   KVM: x86/pmu/vmx: Save/load guest IA32_PERF_GLOBAL_CTRL with
>     vm_exit/entry_ctrl
>   KVM: x86/pmu: Optimize intel/amd_pmu_refresh() helpers
>   KVM: x86/pmu: Setup PMU MSRs' interception mode
>   KVM: x86/pmu: Handle PMU MSRs interception and event filtering
>   KVM: x86/pmu: Switch host/guest PMU context at vm-exit/vm-entry
>   KVM: x86/pmu: Handle emulated instruction for mediated vPMU
>   KVM: nVMX: Add macros to simplify nested MSR interception setting
>   KVM: selftests: Add mediated vPMU supported for pmu tests
>   KVM: Selftests: Support mediated vPMU for vmx_pmu_caps_test
>   KVM: Selftests: Fix pmu_counters_test error for mediated vPMU
>   KVM: x86/pmu: Expose enable_mediated_pmu parameter to user space
> 
> Kan Liang (8):
>   perf: Support get/put mediated PMU interfaces
>   perf: Skip pmu_ctx based on event_type
>   perf: Clean up perf ctx time
>   perf: Add a EVENT_GUEST flag
>   perf: Add generic exclude_guest support
>   perf: Add switch_guest_ctx() interface
>   perf/x86: Support switch_guest_ctx interface
>   perf/x86/intel: Support PERF_PMU_CAP_MEDIATED_VPMU
> 
> Mingwei Zhang (5):
>   perf/x86: Forbid PMI handler when guest own PMU
>   perf/x86/core: Plumb mediated PMU capability from x86_pmu to
>     x86_pmu_cap
>   KVM: x86/pmu: Exclude PMU MSRs in vmx_get_passthrough_msr_slot()
>   KVM: x86/pmu: introduce eventsel_hw to prepare for pmu event filtering
>   KVM: nVMX: Add nested virtualization support for mediated PMU
> 
> Sandipan Das (4):
>   perf/x86/core: Do not set bit width for unavailable counters
>   KVM: x86/pmu: Add AMD PMU registers to direct access list
>   KVM: x86/pmu/svm: Set GuestOnly bit and clear HostOnly bit when guest
>     write to event selectors
>   perf/x86/amd: Support PERF_PMU_CAP_MEDIATED_VPMU for AMD host
> 
> Xiong Zhang (3):
>   x86/irq: Factor out common code for installing kvm irq handler
>   perf: core/x86: Register a new vector for KVM GUEST PMI
>   KVM: x86/pmu: Register KVM_GUEST_PMI_VECTOR handler

I ran out of time today and didn't get emails send for all patches.  I'm planning
on getting that done tomorrow.

I already have most of the proposed changes implemented:

  https://github.com/sean-jc/linux.git x86/mediated_pmu

It compiles and doesn't explode, but it's not fully functional (PMU tests fail).
I'll poke at it over the next few days, but if someone is itching to figure out
what I broke, then by all means.

Given that I've already made many modifications (I have a hard time reviewing a
series this big without editing as I go), unless someone objects, I'll post v5
(and v6+ as needed), though that'll like be days/weeks as I need to get it working,
and want to do more passes over the code, shortlogs, and changelogs.