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). Testing the hypervisor bit is the first line of action. Paolo > this at least should give full speedup in existing setups. Not 99% > architecturally correct but might just work. >
