[Libvir] Question about specifications of virsh start

Richard W.M. Jones rjones at redhat.com
Wed Nov 7 13:32:56 UTC 2007

Masayuki Sunou wrote:
> Hi
> I have a question about specifications of virsh start.
> It is necessary to remove "type=ioemu" from the configuration file of Xen,
> when HVM domain installed Para Virtualized Driver use unmodified driver
> on Xen 3.0.3.
> But,libvirt always adds "type=ioemu" to vif of HVM domain in xm_internal.c.
> Therefore virsh start cannot start correctly HVM domain installed
> Para Virtualized Driver.
> Could you teach why does libvirt disregard setting of configuration
> file and set type=ioemu ?

This is surely a bug in libvirt, src/xm_internal.c, xenXMParseXMLVif:

     if (hvm) {
         strcat(buf, ",type=ioemu");

Do you know what we can use to determine if the PV drivers are installed 
in a domain?  I don't think there is anything extrinsic, so perhaps we 
need to add something to the XML domain description.


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