Messages in this thread | | | Subject | Re: [PATCH] kvm: VMX: do not use vm-exit instruction length for fast MMIO | From | David Hildenbrand <> | Date | Fri, 18 Aug 2017 14:41:52 +0200 |
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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
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