Re: [Xen-devel] libvirt and virt-manager default blktap driver name for file images, tap vs tap2?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jun 06, 2013 at 12:58:41PM -0600, Jim Fehlig wrote:
> Pasi Kärkkäinen wrote:
> > Hello,
> >
> > Does anyone know where/how to set the default libvirt blktap "driver name" 
> > for disk image files?
> >
> > If I have "blktap" module loaded in dom0 kernel, and I do this:
> >
> > virt-install -d -n blktaptest01 -r 2048 --vcpus=2 --disk 
> > /var/lib/libvirt/images/blktaptest01.img,size=8 --vnc -p -l 
> > "http://ftp.funet.fi/pub/mirrors/centos.org/6.4/os/x86_64";
> >   
> 
> Does it work if you specify the driver name in the diskopts?  E.g.
> 
>   --disk /var/lib/libvirt/images/blktaptest01.img,size=8,driver_name=tap2
>

Yep, that works.

I was mostly wondering how to specify/change the *default*,
so that both virt-install and virt-manager work without specifying 
driver_name=tap2 .. 

Any ideas about that?

Thanks,

-- Pasi

 
> Regards,
> Jim
> 
> > which results in this generated libvirt xml config for the VM:
> >
> >     <disk type='file' device='disk'>
> >       <driver name='tap' type='aio'/>
> >       <source file='/var/lib/libvirt/images/blktaptest01.img'/>
> >       <target dev='xvda' bus='xen'/>
> >     </disk>
> >
> > .. which doesn't seem to work for me with Xen 4.2.2 using xm/xend, and 
> > libvirt 0.10.x.
> >
> > The problem is there's no tapdisk process started in dom0, and the block 
> > device cannot be 
> > initialized or accessed inside the VM. I have the same problem with 
> > virt-manager, 
> > using the "new VM" wizard with disk image files.
> >
> > The correct "driver name" for libvirt is "tap2", which works for me, 
> > so I need to manually edit the libvirt xml config to make the VM boot/work.
> >
> > This matches xm/xend behaviour with text config files for VMs. 
> > I need to use tap2 there aswell on the disk = [] line.
> >
> > Where should I choose/set/patch the default libvirt driver name? Is that in 
> > libvirt sources,
> > or in virt-install/virt-manager ? I tried reading the libvirt "xen" driver 
> > source, 
> > but I couldn't find any "default" setting there.. 
> >
> > Thanks,
> >
> > -- Pasi
> >
> >
> >   

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