linux-kernel - Re: [PATCH 6.1] KVM: x86/mmu: Fix an sign-extension bug with mmu

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Date:   Thu, 24 Aug 2023 16:46:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     stable@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6.1] KVM: x86/mmu: Fix an sign-extension bug with mmu_seq
 that hangs vCPUs

On Thu, Aug 24, 2023 at 06:46:59AM -0700, Sean Christopherson wrote:
> On Thu, Aug 24, 2023, Greg Kroah-Hartman wrote:
> > On Wed, Aug 23, 2023 at 06:01:04PM -0700, Sean Christopherson wrote:
> > > Note, upstream commit ba6e3fe25543 ("KVM: x86/mmu: Grab mmu_invalidate_seq
> > > in kvm_faultin_pfn()") unknowingly fixed the bug in v6.3 when refactoring
> > > how KVM tracks the sequence counter snapshot.
> > > 
> > > Reported-by: Brian Rak <brak@...tr.com>
> > > Reported-by: Amaan Cheval <amaan.cheval@...il.com>
> > > Reported-by: Eric Wheeler <kvm@...ts.ewheeler.net>
> > > Closes: https://lore.kernel.org/all/f023d927-52aa-7e08-2ee5-59a2fbc65953@gameservers.com
> > > Fixes: a955cad84cda ("KVM: x86/mmu: Retry page fault if root is invalidated by memslot update")
> > > Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> > 
> > What is the git commit id of this change in Linus's tree?
> 
> There is none.  Commit ba6e3fe25543 (landed in v6.3) unknowingly fixed the bug as
> part of a completely unrelated refactoring.

Ah, missed that in the text here, thanks!

greg k-h