linux-kernel - Re: [GIT PULL] KVM: x86: APIC changes for 6.7

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Message-ID: <CABgObfZEXKOnLaU9pcH8n3VSGgFRYWy00VP4n5szjdK-pBMhqw@mail.gmail.com>
Date:   Tue, 31 Oct 2023 15:15:00 +0100
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: APIC changes for 6.7

On Fri, Oct 27, 2023 at 10:49 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Two small APIC changes for 6.7, both specific to Intel's APICv.
>
> 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-apic-6.7
>
> for you to fetch changes up to 629d3698f6958ee6f8131ea324af794f973b12ac:
>
>   KVM: x86: Clear bit12 of ICR after APIC-write VM-exit (2023-09-28 10:42:16 -0700)

Pulled, thanks.

Paolo

> ----------------------------------------------------------------
> KVM x86 APIC changes for 6.7:
>
>  - Purge VMX's posted interrupt descriptor *before* loading APIC state when
>    handling KVM_SET_LAPIC.  Purging the PID after loading APIC state results in
>    lost APIC timer IRQs as the APIC timer can be armed as part of loading APIC
>    state, i.e. can immediately pend an IRQ if the expiry is in the past.
>
>  - Clear the ICR.BUSY bit when handling trap-like x2APIC writes to suppress a
>    WARN due to KVM expecting the BUSY bit to be cleared when sending IPIs.
>
> ----------------------------------------------------------------
> Haitao Shan (1):
>       KVM: x86: Fix lapic timer interrupt lost after loading a snapshot.
>
> Tao Su (1):
>       KVM: x86: Clear bit12 of ICR after APIC-write VM-exit
>
>  arch/x86/include/asm/kvm-x86-ops.h |  1 +
>  arch/x86/include/asm/kvm_host.h    |  1 +
>  arch/x86/kvm/lapic.c               | 30 +++++++++++++++++-------------
>  arch/x86/kvm/vmx/vmx.c             |  4 ++--
>  4 files changed, 21 insertions(+), 15 deletions(-)
>