Re: [Xen-users] pv_ops Dom0 kernel for DomU?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, May 14, 2010 at 09:05:02PM +0100, Ian Tobin wrote:
> Oh right, thats new to me. Ive never had to do that before, is that new to 
> the pv_ops?
> 

It's not really pvops specific.. it's more about the fact that nowadays all/most
drivers are built as modules - so you need to have an initrd image to load them.

If you compiled all the xen* stuff as static/built-in then you wouldn't need an 
initrd..

> Many thanks for the info, you learn something new everyday :)
> 

Np.

-- Pasi

> Ian
> 
> 
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: 14 May 2010 20:50
> To: Ian Tobin
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> 
> On Fri, May 14, 2010 at 08:45:03PM +0100, Ian Tobin wrote:
> > Ah ok, what would be the procedure to do that? 
> > 
> > Thanks
> > 
> 
> Usually it's best to generate the initrd image in the guest,
> and use the distro provided domU kernel.
> 
> If you install the guest using the guest distro installer it'll do it for you 
> automatically.
> 
> You can also do it from dom0.. example for centos/rhel/fedora:
> 
> mkinitrd -v -f --with-module=xenblk --with-module=xennet 
> /boot/initrd-domU-version.img <kernelversion>
> 
> -- Pasi
> 
> > Ian
> > 
> > 
> > 
> > -----Original Message-----
> > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > Sent: 14 May 2010 20:32
> > To: Ian Tobin
> > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > 
> > On Fri, May 14, 2010 at 08:27:50PM +0100, Ian Tobin wrote:
> > > Ok strange. I have set the DomU config to use the kernel i use for Dom0 
> > > and when booting it gets so far to mount the root filesystem and then 
> > > complains that it cant load the raid1 module which then says it can't 
> > > load md0, md1, md2 and md3 which are my Dom0 software raid disks.
> > > 
> > > When i use the 2.6.8.18 kernel the domU boots fine.
> > > 
> > > I have in the config to use the initrd.img-2.6.32.12 ram disk but it 
> > > doesn't work, am i missing something obvious?
> > > 
> > 
> > Are you using the dom0 initrd for domU? 
> > If you are, you shouldn't.
> > 
> > domU needs to have its own initrd that loads drivers for the virtual 
> > hardware the Xen guest has..
> > 
> > -- Pasi
> > 
> > > Thanks
> > > 
> > > Ian
> > > 
> > > 
> > > -----Original Message-----
> > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > Sent: 14 May 2010 19:48
> > > To: Ian Tobin
> > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > 
> > > On Fri, May 14, 2010 at 03:08:57PM +0100, Ian Tobin wrote:
> > > >    Hi,
> > > > 
> > > > 
> > > > 
> > > >    Just wondered if we can use the pv_ops kernel in Jermeys tree for 
> > > > linux PV
> > > >    domU or do we need to get that one from kernel.org ?
> > > > 
> > > 
> > > Both will work.
> > > 
> > > upstream kernel.org kernels do have basic Xen PV domU support 
> > > out-of-the-box.
> > > Jeremy's tree has some additional features, like pcifront/pciback etc,
> > > that are not yet upstream.
> > > 
> > > -- Pasi
> > > 
> > > > 
> > > > 
> > > >    Thanks
> > > > 
> > > > 
> > > > 
> > > >    Ian
> > > > 
> > > > 
> > > > 
> > > > 
> > > 
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > http://lists.xensource.com/xen-users
> > > 
> > > 
> > 
> > 
> 
> 

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