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



On 5/13/19 5:06 PM, Jan Beulich wrote:
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.

Right, I did indeed forget about the pending review part, for some reason I was sure they made it in. I've double-checked and we really are using 4.13-unstable - but we've also made changes to the emulator, working on the send-vm-events-from-the-emulator patch, so we'll revert to a pristine staging and retry, there's a chance this happens because of our changes.

We'll find out what's going on exactly.


Thanks,
Razvan

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