[Xen-devel] MMIO emulation failed & successful reboot

[Liwei <xieliwei@xxxxxxxxx>]

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

Attachment: DriverUpdateMMIOEmulationFail.txt
Description: Text document

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