linux-kernel - Re: WARNING in enter_vmx

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Date:   Mon, 1 Apr 2019 12:21:19 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     syzbot <syzbot+ab5d7a5d0fc0c7518f6d@...kaller.appspotmail.com>
Cc:     hpa@...or.com, jmattson@...gle.com, karahmed@...zon.de,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, pbonzini@...hat.com, rkrcmar@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: WARNING in enter_vmx_operation

On Sat, Mar 30, 2019 at 03:33:00AM -0700, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 8fcc4b5923af5de58b80b53a069453b135693304
> Author: Jim Mattson <jmattson@...gle.com>
> Date:   Tue Jul 10 09:27:20 2018 +0000
> 
>     kvm: nVMX: Introduce KVM_CAP_NESTED_STATE
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16dc157d200000
> start commit:   3f16503b Merge branch 'fixes' of git://git.kernel.org/pub/..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=15dc157d200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11dc157d200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=49927b422dcf0b29
> dashboard link: https://syzkaller.appspot.com/bug?extid=ab5d7a5d0fc0c7518f6d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=132365a6400000
> 
> Reported-by: syzbot+ab5d7a5d0fc0c7518f6d@...kaller.appspotmail.com
> Fixes: 8fcc4b5923af ("kvm: nVMX: Introduce KVM_CAP_NESTED_STATE")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Likewise, this is variant on the bug fixed by commit 5bea5123cbf0 ("KVM: VMX:
check nested state and CR4.VMXE against SMM").

#syz fix: KVM: VMX: check nested state and CR4.VMXE against SMM