linux-kernel - Re: [GIT PULL] KVM: x86: AVIC vTPR fix for 6.17

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Message-ID: <0d38af14-53b9-489e-bd10-27bb6c7af470@redhat.com>
Date: Wed, 17 Sep 2025 19:52:56 +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: AVIC vTPR fix for 6.17

On 9/16/25 02:38, Sean Christopherson wrote:
> Please grab a single fix for 6.17.  The bug has existed for some time, so it's
> not super critical that it get into 6.17, but it'd be nice to get this on its
> way to LTS kernels sooner than later.  Thanks!
> 
> The following changes since commit 42a0305ab114975dbad3fe9efea06976dd62d381:
> 
>    Merge tag 'kvmarm-fixes-6.17-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD (2025-08-29 12:57:31 -0400)
> 
> are available in the Git repository at:
> 
>    https://github.com/kvm-x86/linux.git tags/kvm-x86-fixes-6.17-rcN
> 
> for you to fetch changes up to d02e48830e3fce9701265f6c5a58d9bdaf906a76:
> 
>    KVM: SVM: Sync TPR from LAPIC into VMCB::V_TPR even if AVIC is active (2025-09-10 12:04:16 -0700)

Pulled, thanks.

Paolo

> ----------------------------------------------------------------
> KVM x86 fix for 6.17-rcN
> 
> Sync the vTPR from the local APIC to the VMCB even when AVIC is active, to fix
> a bug where host updates to the vTPR, e.g. via KVM_SET_LAPIC or emulation of a
> guest access, effectively get lost and result in interrupt delivery issues in
> the guest.
> 
> ----------------------------------------------------------------
> Maciej S. Szmigiero (1):
>        KVM: SVM: Sync TPR from LAPIC into VMCB::V_TPR even if AVIC is active
> 
>   arch/x86/kvm/svm/svm.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>