linux-kernel - Re: [PATCH 1/7] KVM: x86: Retry page fault if MMU reload is pending and root has no sp

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Message-ID: <8b294ccb-28c2-57fb-3e1e-6ec8c55e410c@redhat.com>
Date:   Sun, 19 Dec 2021 19:41:09 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Maxim Levitsky <mlevitsk@...hat.com>,
        Ben Gardon <bgardon@...gle.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH 1/7] KVM: x86: Retry page fault if MMU reload is pending
 and root has no sp

On 12/15/21 19:53, Sean Christopherson wrote:
>>
>>> 2) a case that has been handled in the inefficient way forever.
>> I don't care about inefficiency, I'm worried about correctness.  It's extremely
>> unlikely this fixes a true bug in the legacy MMU, but there's also no real
>> downside to adding the check.
>>
>> Anyways, either way is fine.
> Ping, in case this dropped off your radar.  Regardless of how we fix this goof,
> it needs to get fixed in 5.16.

Something has happened to my home directory in the middle of tests 
running for this rc, and I can't really do anything about it until 
someone sees my ticket. :/  This is the Linux maintainer version of a 
dog eating my homework, I suppose.

Since there was another report of this, I'll just queue up this version 
and send it out.

Paolo