linux-kernel - Re: [GIT PULL] KVM: x86: PMU fixes for 6.6

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Message-ID: <CABgObfY_p4ysKh1kya8GxHSwF4gFx25vavUJOWMZES=Y-8SvcA@mail.gmail.com>
Date:   Sun, 15 Oct 2023 14:24:35 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] KVM: x86: PMU fixes for 6.6

On Sat, Oct 14, 2023 at 1:48 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Please pull three PMU fixes for 6.6.  These aren't super urgent and have all
> existed from some time, i.e. don't absolutely need to go into 6.6, but I also
> don't see a good reason to hold them back (they're all tagged for stable, so
> it's kind of a moot point).

Pulled, thanks.

Paolo

> The following changes since commit 5804c19b80bf625c6a9925317f845e497434d6d3:
>
>   Merge tag 'kvm-riscv-fixes-6.6-1' of https://github.com/kvm-riscv/linux into HEAD (2023-09-23 05:35:55 -0400)
>
> are available in the Git repository at:
>
>   https://github.com/kvm-x86/linux.git tags/kvm-x86-pmu-6.6-fixes
>
> for you to fetch changes up to 73554b29bd70546c1a9efc9c160641ef1b849358:
>
>   KVM: x86/pmu: Synthesize at most one PMI per VM-exit (2023-09-25 14:42:52 -0700)
>
> ----------------------------------------------------------------
> KVM x86/pmu fixes for 6.6:
>
>  - Truncate writes to PMU counters to the counter's width to avoid spurious
>    overflows when emulating counter events in software.
>
>  - Set the LVTPC entry mask bit when handling a PMI (to match Intel-defined
>    architectural behavior).
>
>  - Treat KVM_REQ_PMI as a wake event instead of queueing host IRQ work to
>    kick the guest out of emulated halt.
>
> ----------------------------------------------------------------
> Jim Mattson (2):
>       KVM: x86: Mask LVTPC when handling a PMI
>       KVM: x86/pmu: Synthesize at most one PMI per VM-exit
>
> Roman Kagan (1):
>       KVM: x86/pmu: Truncate counter value to allowed width on write
>
>  arch/x86/include/asm/kvm_host.h |  1 -
>  arch/x86/kvm/lapic.c            |  8 ++++++--
>  arch/x86/kvm/pmu.c              | 27 +--------------------------
>  arch/x86/kvm/pmu.h              |  6 ++++++
>  arch/x86/kvm/svm/pmu.c          |  2 +-
>  arch/x86/kvm/vmx/pmu_intel.c    |  4 ++--
>  arch/x86/kvm/x86.c              |  3 +++
>  7 files changed, 19 insertions(+), 32 deletions(-)
>