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[Xen-users] GPL PV TAP cow incompatible?

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

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?

/Martin





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