[0/4] KVM: x86/pmu: Counter reprogramming fixes

Message

Sean Christopherson Sept. 23, 2022, 12:13 a.m. UTC

The headliner is Like's patches to fix a bug where KVM's sleeps with IRQs
disabled due to attempting to pause and reprogram PMU counters in the
VM-Exit fast path.

Patches 1 and 2 (mine) fix mostly theoretical issues found when reviewing
Like's code, and would conflict with Like's patches if posted separately.

This is _very_ lightly tested, borderline RFC, but Like's updated PMU
KUT tests pass, as do the filter selftests, and I'm feeling lucky.

And I'm offline until Monday, so a traditional Friday patch bomb is in
order ;-)

Like Xu (2):
  KVM: x86/pmu: Defer reprogram_counter() to kvm_pmu_handle_event()
  KVM: x86/pmu: Defer counter emulated overflow via pmc->prev_counter

Sean Christopherson (2):
  KVM: x86/pmu: Force reprogramming of all counters on PMU filter change
  KVM: x86/pmu: Clear "reprogram" bit if counter is disabled or
    disallowed

 arch/x86/include/asm/kvm_host.h | 17 ++++--
 arch/x86/kvm/pmu.c              | 92 +++++++++++++++++++++------------
 arch/x86/kvm/pmu.h              |  6 ++-
 arch/x86/kvm/svm/pmu.c          |  4 +-
 arch/x86/kvm/vmx/pmu_intel.c    | 10 ++--
 5 files changed, 86 insertions(+), 43 deletions(-)


base-commit: efc8a6befa592de7e2fd4927b1b9a56a5ec7d8cf