On Thu, Oct 13, 2022, Hou Wenlong wrote: > On Thu, Oct 13, 2022 at 12:34:57AM +0800, Sean Christopherson wrote: > > diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c > > index 3b27622d4642..fe735e18c419 100644 > > --- a/arch/x86/kvm/emulate.c > > +++ b/arch/x86/kvm/emulate.c > > @@ -1641,6 +1641,14 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, > > goto exception; > > break; > > case VCPU_SREG_CS: > > + /* > > + * KVM uses "none" when loading CS as part of emulating Real > > + * Mode exceptions and IRET (handled above). In all other > > + * cases, loading CS without a control transfer is a KVM bug. > > + */ > > + if (WARN_ON_ONCE(transfer == X86_TRANSFER_NONE)) > > + goto exception; > > + > > if (!(seg_desc.type & 8)) > > goto exception; > > > Do I need to prepare this patch or you will add this directly? No preference. Feel free to post a patch, if not I'll get to it soon-ish.
