On Thu, Sep 20, 2018 at 06:32:10PM +0200, Paolo Bonzini wrote: > On 19/09/2018 16:33, Sean Christopherson wrote: > > On Tue, 2018-09-18 at 19:03 -0400, Peng Hao wrote: > >> From: Peng Hao <peng.hao2@xxxxxxxxxx> > >> > >> When handling ept misconfig exit, it will call emulate instruction > >> with insn_len = 0. The decode instruction function may return a fetch > >> fault and should propagate to guest. > > > > What fault is encountered, e.g. #PF, #UD, etc...? Something like a > > #UD at this point should result in an exit to userspace as it means > > KVM was unable to emulate an instruction that was successfully > > decoded by hardware. > > If it's the same bug as https://lore.kernel.org/patchwork/patch/850077/ > it would be a #PF. Indeed it is, let's move this discussion to that thread.
