Re: [PATCH] KVM: x86: Forcibly leave nested virt when SMM state is toggled

[Paolo Bonzini]

On 2/18/22 18:22, Tadeusz Struk wrote:
> On 2/18/22 08:58, Sean Christopherson wrote:
> > This SMM-specific patch fixes something different, the bug that you 
> > are still
> > hitting is the FNAME(cmpxchg_gpte) mess.  The uaccess CMPXCHG 
> > series[*] that
> > properly fixes that issue hasn't been merged yet.
> >
> >    ==================================================================
> >    BUG: KASAN: use-after-free in ept_cmpxchg_gpte.constprop.0+0x3c3/0x590
> >    Write of size 8 at addr ffff888010000000 by task repro/5633
> >
> > [*]https://lore.kernel.org/all/20220202004945.2540433-1-seanjc@xxxxxxxxxx
>
> Ok, that's good. I will keep an eye on it and give it a try then.

I'll poke PeterZ for a review next week.

Paolo