linux-kernel - Re: [PATCH 0/6] KVM: x86: x2APIC reserved bits/regs fixes

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Date:   Fri, 13 Jan 2023 18:41:37 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marc Orr <marcorr@...gle.com>, Ben Gardon <bgardon@...gle.com>,
        Venkatesh Srinivas <venkateshs@...omium.org>
Subject: Re: [PATCH 0/6] KVM: x86: x2APIC reserved bits/regs fixes

On Fri, Jan 13, 2023, Paolo Bonzini wrote:
> On 1/7/23 02:10, Sean Christopherson wrote:
> > Fixes for edge cases where KVM mishandles reserved bits/regs checks when
> > the vCPU is in x2APIC mode.
> > 
> > The first two patches were previously posted[*], but both patches were
> > broken (as posted against upstream), hence I took full credit for doing
> > the work and changed Marc to a reporter.
> > 
> > The VMX APICv fixes are for bugs found when writing tests.  *sigh*
> > I didn't Cc those to stable as the odds of breaking something when touching
> > the MSR bitmaps seemed higher than someone caring about a 10 year old bug.
> > 
> > AMD x2AVIC support may or may not suffer similar interception bugs, but I
> > don't have hardware to test and this already snowballed further than
> > expected...
> > 
> > [*] https://lore.kernel.org/kvm/20220525173933.1611076-1-venkateshs@chromium.org
> 
> Looks good; please feel free to start gathering this in your tree for 6.3.

Thanks!

> Next week I'll go through Ben's series as well as Aaron's "Clean up the
> supported xfeatures" and others.
> 
> Let me know if you would like me to queue anything of these instead, and
> please remember to set up the tree in linux-next. :)

Ya, next week is going to be dedicated to sorting out maintenance mechanics.