Xen devel - Oct 2011 - MMIO emulation failed & successful reboot

Hello list,
    Did an update to the latest AMD drivers
(11-9_vista64_win7_64_dd_ccc_ocl) and was pleasantly surprised to find
that I can reboot my passthrough domU!
    Firstly, the reboot was triggered involuntarily shortly (20
seconds) AFTER the SUCCESSFUL driver update. The only thing logged was
this:
        (XEN) io.c:194:d5 MMIO emulation failed @
0010:fffff800036c7d00: 0f 28 04 10 0f 28
    The domU and qemu spontaneously disappeared (the qemu log just
stops there and logs nothing), and reappeared, as a new domU instance
was automatically spawned.
    This first reboot would be unsuccessful, encountering a BSOD at
the pulsating logo stage:
        "Attempt to reset the display driver and recover from timeout
failed"
    The second try would be successful.

    The awesome thing is, I tried normally rebooting the domU a few
times after that, no problems! =)

    Attached is the full log captured between the start of the driver
update and the second (successful) reboot.

Liwei


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>>> On 05.10.11 at 19:03, Liwei <xieliwei@gmail.com> wrote:
>         (XEN) io.c:194:d5 MMIO emulation failed @
> 0010:fffff800036c7d00: 0f 28 04 10 0f 28
Sooner or later we will need to support at least the most fundamental
SSE (and perhaps also AVX) instructions. What I''m surprised about is
that this is a load from memory rather than a store - I would have
hoped that we could get away with just emulating stores.

Jan


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On 06/10/2011 07:59, "Jan Beulich" <JBeulich@suse.com> wrote:
>>>> On 05.10.11 at 19:03, Liwei <xieliwei@gmail.com> wrote:
>>         (XEN) io.c:194:d5 MMIO emulation failed @
>> 0010:fffff800036c7d00: 0f 28 04 10 0f 28
> 
> Sooner or later we will need to support at least the most fundamental
> SSE (and perhaps also AVX) instructions. What I''m surprised about
is
> that this is a load from memory rather than a store - I would have
> hoped that we could get away with just emulating stores.
Supporting a few more MOV variants would be nice at least. We''ve got
away
with MOVQ as our only supported MMX instruction for a long time...

We''d just need to extend the get_fpu() callback to understand and check
for
X86_EMUL_sseN/avx.

 -- Keir
> Jan
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel


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