linux-kernel - Re: [PATCH] KVM: x86: Initialize tdp

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Message-ID: <20200527170612.GA24930@linux.intel.com>
Date:   Wed, 27 May 2020 10:06:13 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     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,
        syzbot+904752567107eefb728c@...kaller.appspotmail.com
Subject: Re: [PATCH] KVM: x86: Initialize tdp_level during vCPU creation

On Wed, May 27, 2020 at 06:56:19PM +0200, Paolo Bonzini wrote:
> On 27/05/20 18:29, Sean Christopherson wrote:
> > Ya.  syzbot is hitting a #GP due to NULL pointer during debugfs on the exact
> > same sequence.  I haven't been able to reproduce that one (have yet to try
> > syzbot's exact config), but it's another example of a "dumb" test hitting
> > meaningful bugs.
> 
> Saw that, it's mine. :)

All yours.  I as hoping it would be easily reproducible and fixable while I
was looking at the MMU BUG(), but that didn't happen.