Re: [PATCH v7 00/17] KVM: x86/pmu: Add support for AMD Host-Only/Guest-Only bits

[Sean Christopherson <seanjc@google.com>]

On Wed, May 27, 2026, Yosry Ahmed wrote:
> Jim Mattson (2):
>   KVM: x86/pmu: Allow Host-Only/Guest-Only bits with nSVM and mediated
>     PMU
>   KVM: selftests: Add svm_pmu_host_guest_test for Host-Only/Guest-Only
>     bits
> 
> Yosry Ahmed (15):
>   KVM: nSVM: Stop leaking single-stepping on VMRUN into L2
>   KVM: nSVM: Bail early out of VMRUN emulation if advancing RIP fails
>   KVM: nSVM: Unify RIP and PMU handling calls when emulating VMRUN
>   KVM: nSVM: Move VMRUN instruction retirement after entering guest mode
>   KVM: x86: Move enable_pmu/enable_mediated_pmu to pmu.h and pmu.c
>   KVM: x86/pmu: Rename reprogram_counters() to clarify usage
>   KVM: x86/pmu: Do a single atomic OR when reprogramming counters
>   KVM: x86/pmu: Check mediated PMU counter enablement before event
>     filters
>   KVM: x86/pmu: Add support for KVM_X86_PMU_OP_OPTIONAL_RET0
>   KVM: x86/pmu: Disable counters based on Host-Only/Guest-Only bits in
>     SVM
>   KVM: x86/pmu: Track mediated PMU counters with mode-specific enables
>   KVM: x86/pmu: Reprogram Host/Guest-Only counters on nested transitions
>   KVM: selftests: Refactor allocating guest stack into a helper
>   KVM: selftests: Allocate a dedicated guest page for x86 L2 guest stack
>   KVM: selftests: Drop L1-provided stacks for L2 guests on x86

This all looks good.  I'll get the KVM changes applied and pushed (assuming they
pass testing).

For the selftests, I'm going to hold off on applying them until after the initial
pull requests for 7.2 are merged into Paolo's tree.  The (AWESOME!!!) L2 stack
changes are going to cause conflict hell, and it's easy enough for me to carry
them out of tree for a few weeks.

I'll send a refreshed version of the selftest once kvm-x86 has settled down for
7.2, e.g. to account for the gpat test as well.