On Wed, Jun 26, 2013 at 04:11:59PM +0200, Borislav Petkov wrote:
> On Tue, Jun 25, 2013 at 02:10:20PM +0300, Gleb Natapov wrote:
> > > - if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
> > > + if (!(ctxt->d & EmulateOnUD) && ctxt->only_vendor_specific_insn)
> > Lets rename only_vendor_specific_insn to something like ->ud too.
>
> So this thing is set only when either svm or vmx encounter an #UD and go
> and emulate the instruction.
>
> I guess this is for the case where we actually do want to inject the #UD
> into the guest and not emulate the instruction.
>
> Btw, it is only checked in x86_decode_insn so we could just as well hand
> down the emulation_type from the caller x86_emulate_instruction and kill
> ->only_vendor_specific_insn completely like so:
>
> if (!(ctxt->d & EmulateOnUD) && (emul_type & EMULTYPE_TRAP_UD))
>
EMULTYPE_ values are external to emulator.c and control how x86.c
invokes the emulator. I prefer not to change kvm<->emulator interface
just to get rid of one ctxt field.
--
Gleb.
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