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Re: [Xen-devel] [PATCH v1] x86/hvm: Generic instruction re-execution mechanism for execute faults

On 11/27/18 12:49 PM, Razvan Cojocaru wrote:
With a sufficiently complete insn emulator, single-stepping should
not be needed at all imo. Granted we're not quite there yet with
the emulator, but we've made quite a bit of progress. As before,
if there are particular instructions you know of that the emulator
doesn't handle yet, please keep pointing these out. Last I know
were some AVX move instructions, which have long been
True, I haven't seen emulator issues in that respect with staging - the
emulator appears lately to be sufficiently complete. Thank you very much
for your help and support - we'll definitely point out unsupported
instructions if we spot some again.

We've come accross a new instruction that the emulator can't handle in Xen 4.13-unstable today:

vpmaddwd xmm4,xmm4,XMMWORD PTR ds:0x513fbb20

Perhaps there are plans for this to go into the emulator as well?


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