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Re: [Xen-users] GPL PV TAP cow incompatible?

To: Nick Couchman <Nick.Couchman@xxxxxxxxx>
Subject: Re: [Xen-users] GPL PV TAP cow incompatible?
From: Martin Kjær Jørgensen <shaoh@xxxxxxx>
Date: Thu, 26 Feb 2009 18:40:11 +0100
Cc: james.harper@xxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
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I'm running Xen 3.3.1 with a patched ioemu-qemu-xen (patched with the qemu_disable_patches.diff patch (6 Jan 2009)) on a Debian Lenny machine. I've compiled Xen manually as Lenny only delivers Xen 3.2.1.
I've also tried with the official ioemu-qemu-xen but with no luck.


Quoting Nick Couchman <Nick.Couchman@xxxxxxxxx>:

What version of Xen are you running?  I've never been able to get
tap:{aio,cow} to work with the GPL PV drivers under Xen 3.2.x.  However,
James Harper has reported that they work find under Xen 3.3.x.


-----Original Message-----
From: Martin Kjær Jørgensen <shaoh@xxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: james.harper@xxxxxxxxxxxxxxxx
Subject: [Xen-users] GPL PV TAP cow incompatible?
Date: Thu, 26 Feb 2009 16:32:48 +0100


Is it true that the GPLPV drivers is incompatible with QCOW images?

The Windows DomU works fine with raw standard "file:/" images, and
paravirtualized Linux DomU works fine with QCOW and raw images.

If i use QCOW images with my Windows DomU's i get a stop error:
0x00000007b (inaccessible boot device).
It looks like the blkback.3.hda process, that normally starts with
normal raw backend, doesnt get started with tap:qcow disks.
Instead i get this repeating entry in the qemu log:
    XenPCI     Still waiting for 2 (currently 1)...
    XenPCI     Still waiting for 2 (currently 1)...
    XenPCI     Still waiting for 2 (currently 1)...

Any ideas?


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