From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jim Fehlig <jfehlig@suse.com>
Subject: Re: libvirt and virt-manager default blktap driver name
 for file images, tap vs tap2?
Date: Thu, 06 Jun 2013 12:58:41 -0600
Message-ID: <51B0DBE1.8070402@suse.com>
References: <20130606100023.GW11427@reaktio.net>
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To: =?ISO-8859-1?Q?Pasi_K=E4rkk=E4inen?= <pasik@iki.fi>
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Pasi K=E4rkk=E4inen 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=3D2 --disk /var/lib/libvi=
rt/images/blktaptest01.img,size=3D8 --vnc -p -l "http://ftp.funet.fi/pub/mi=
rrors/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=3D8,driver_name=3Dta=
p2

Regards,
Jim

> which results in this generated libvirt xml config for the VM:
>
>     <disk type=3D'file' device=3D'disk'>
>       <driver name=3D'tap' type=3D'aio'/>
>       <source file=3D'/var/lib/libvirt/images/blktaptest01.img'/>
>       <target dev=3D'xvda' bus=3D'xen'/>
>     </disk>
>
> .. which doesn't seem to work for me with Xen 4.2.2 using xm/xend, and li=
bvirt 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/wor=
k.
>
> This matches xm/xend behaviour with text config files for VMs. =

> I need to use tap2 there aswell on the disk =3D [] 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" drive=
r source, =

> but I couldn't find any "default" setting there.. =

>
> Thanks,
>
> -- Pasi
>
>
>   =