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Re: [Xen-devel] [PATCH v7 00/15] x86/hvm: I/O emulation cleanup and fix | Full Backtrace of domU's X crash caused by SSE2 istruction in attachment

Hi Gurus:
We found that MOVD instruction are used by some windows driver during developing XenGT, and also we found this one:

(XEN) MMIO emulation failed: d7v1 64bit @ 0010:fffff8000294e273 -> 66 0f e7 00 48 83 c0 10 45 3
b cb 73 f0 45 85 c9

If anyone can help us to upstream this one into instruction emulator and plus the MOVD instruction emulation, that will be nice. :)


ä 07/10/15 19:00, Jan Beulich åé:
On 10.07.15 at 12:51, <fabio.fantoni@xxxxxxx> wrote:
Il 10/07/2015 12:20, Jan Beulich ha scritto:
Other than MOVD, MOVAPS is already being supported by the
insn emulator.

Then why do you think MOVAPS fails in my test?

No idea. That's what Paul asked you to narrow down.

Sse2 was introduced in cpus 11 years ago, so I think it would be useful
to add support for all missing instructions to avoid more cases like
this (and it seems to improve performance too, comparing the same task
executed with/without sse2).

The reason we didn't add any more of the SSE insns so far is that
we don't expect them to be used for accessing MMIO. Once we
learn they're needed, we'll add emulation for them, but you
realize this is a significant task?


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