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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.05.19 at 15:58, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> 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
>>> implemented.
>> 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?

You're kidding? This is already in 4.12.0, and if it weren't I'm sure
you're aware there are about 40 more AVX512 patches pending
review.

Jan



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