On 18.08.2017 14:35, Paolo Bonzini wrote: > On 18/08/2017 13:57, David Hildenbrand wrote: >> What about a hack: >> >> 1. clear instruction length when entering >> 2. check if instruction length is set when trying to forward the RIP >> 2a. if set, use it >> 2b. if not set, compute it > > It's undefined, so we don't know that the instruction length remains > zero (also, on older processors and possibly some nested setups the > field is read-only). Oh I see, too bad :( > > Testing the hypervisor bit is the first line of action. > > Paolo -- Thanks, David