[libvirt] [PATCH] libvirt no longer supports qemu format=host_device

[Jamie Strandboge]

Bug: https://launchpad.net/bugs/665531

The fixes for CVE-2010-2237, CVE-2010-2238 and CVE-2010-2239 broke
format=host_device for the qemu driver. Qemu's host_device is used to
specify raw files that don't have holes, so we need to treat <driver
name='qemu' type='host_device'/> as raw in virDomainDiskDefForeachPath()
(like we do for 'aio'). For example, the following xml is no longer
valid, but should be:

    <disk type='file' device='disk'>
      <driver name='qemu' type='host_device'/>
      <source file='/tmp/foo.img'/>
      <target dev='hda' bus='ide'/>
    </disk>

This is confirmed as not working on 0.8.3 and 0.8.5. The attached patch
against 0.8.5 fixes the issue and restores host_device support.

-- 
Jamie Strandboge             | http://www.canonical.com
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