linux-kernel - Re: [PATCH v2 0/3] KVM: SVM: Fix GATag bug for >256 vCPUs

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Message-ID: <Y+1YL7jaNEUUYfGq@google.com>
Date:   Wed, 15 Feb 2023 14:11:17 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alejandro Jimenez <alejandro.j.jimenez@...cle.com>
Subject: Re: [PATCH v2 0/3] KVM: SVM: Fix GATag bug for >256 vCPUs

On Thu, Feb 16, 2023, Suthikulpanit, Suravee wrote:
> 
> 
> On 2/7/2023 7:21 AM, Sean Christopherson wrote:
> > Fix a bug in KVM's use of the GATag where it unintentionally drops a bit
> > from vCPU IDs greater than 255 and as a result wakes the wrong vCPU.
> > 
> > Suravee and/or Alejandro, can you give this proper testing?  It's compile
> > tested only at this point.  I'll do basic testing before officially
> > applying, but AFAIK I don't have access to x2AVIC hardware, nor do I have
> > a ready-to-go configuration to properly exercise this code.
> > 
> > Thanks!
> > 
> > Sean Christopherson (2):
> >    KVM: SVM: Fix a benign off-by-one bug in AVIC physical table mask
> >    KVM: SVM: WARN if GATag generation drops VM or vCPU ID information
> > 
> > Suravee Suthikulpanit (1):
> >    KVM: SVM: Modify AVIC GATag to support max number of 512 vCPUs
> > 
> >   arch/x86/include/asm/svm.h | 12 +++++++-----
> >   arch/x86/kvm/svm/avic.c    | 37 ++++++++++++++++++++++++++++---------
> >   2 files changed, 35 insertions(+), 14 deletions(-)
> > 
> > 
> > base-commit: 32e69f232db4ca11f26e5961daeff93906ce232f
> 
> For the series:
> 
> Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

Thanks much!

Paolo, do you want to grab this directly, or should I throw this in next for a
few days and send a separate pull request?  Or do something else entirely?