Re: [PATCH] KVM: X86: Fix SMRAM accessing even if VM is shutdown

[Xiao Guangrong]

On 02/09/2018 08:42 PM, Paolo Bonzini wrote:
> On 09/02/2018 04:22, Xiao Guangrong wrote:
> > >
> >
> > That is a good question... :)
> >
> > This case (with KVM_MEMSLOT_INVALID is set) can be easily constructed,
> > userspace should avoid this case by itself (avoiding vCPU accessing the
> > memslot which is being updated). If it happens, it's a operation issue
> > rather than INTERNAL ERROR.
> >
> > Maybe treat it as MMIO accessing and return to userspace with MMIO_EXIT
> > is a better solution...
>
> Yeah, that's what emulation would do (except if it's an instruction
> fetch, which will cause emulation to fail).  I think it's a bug in the
> non-EPT #PF case that we return with -EFAULT.

Wanpeng, could you please do it? :)