[vfio-users] Fwd: UEFI Win7 VM randomly does not start

[Alexander Petrenz]

Well I don't think I can provide a scenario which is easy enough to debug.

But at least I know where it comes from.

Thanks
Alex

---------- Forwarded message ----------
From: Alex Williamson <alex.williamson at redhat.com>
Date: Sat, Oct 17, 2015 at 3:15 PM
Subject: Re: [vfio-users] UEFI Win7 VM randomly does not start
To: Alexander Petrenz <petrenz.a at gmail.com>
Cc: vfio-users at redhat.com


On Sat, 2015-10-17 at 10:50 +0200, Alexander Petrenz wrote:
> Hi all,
>
> I have the problem that my UEFI VM for a Windows 7 guest does not always
> starts properly. When it doesn´t work I have to try it again and finally
it
> will work after something between 3 to 6 attempts. The only error message
> is:
> qemu-system-x86_64: Guest moved used index from 13 to 0

This is a virtio issue that ring indexes are out of sync.  If you can
come up with a reproducible scenario on latest kernel and qemu, it
should be reported to the qemu-devel mailing list.  I've seen it
occasionally, but not consistently enough to debug.  Thanks,

Alex
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