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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 17, 2010 at 08:40:34AM +0100, Ian Tobin wrote:
> Hey Pasi,
> 
> Ive downloaded 2.6.33.4 from kernel.org.  The XEN stuff is compiled as static 
> and so is raid,i have created a initrd image by issueing the following 
> (Debian OS)
> 
> Mkinitramfs -o /boot/initrd.img-2.6.33.4 2.6.33.4    
> 

Did you generate the initrd in dom0? You should generate it in domU.. 
then you won't have all the dom0-specific md-raid stuff etc there.

> When booting i get the same error
> 
> 
> Loading, please wait...
> Begin: Loading essential drivers ... done.
> Begin: Running /scripts/init-premount ... FATAL: Error inserting fan 
> (/lib/modules/2.6.33.4/kernel/drivers/acpi/fan.ko): No such device
> FATAL: Error inserting thermal 
> (/lib/modules/2.6.33.4/kernel/drivers/acpi/thermal.ko): No such device
> done.
> Begin: Mounting root file system ... Begin: Running /scripts/local-top ... 
> Begin: LoadingFailure: failed to load module raid1.
> done.
> Begin: Assembling all MD arrays ... [    1.991528] md: md0 stopped.
> mdadm: no devices found for /dev/md0
> [    2.004392] md: md1 stopped.
> mdadm: no devices found for /dev/md1
> [    2.021788] md: md2 stopped.
> mdadm: no devices found for /dev/md2
> [    2.047173] md: md3 stopped.
> mdadm: no devices found for /dev/md3
> Failure: failed to assemble all arrays.
> done.
> Begin: Waiting for udev to process events ... done.
> done.
> Begin: Waiting for root file system ...
> 
> 
> Im not sure if i have missed something out, any ideas?
> 

Please paste "grep XEN .config" from the domU kernel.

-- Pasi



> Cheers
> 
> Ian
> 
> 
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: 14 May 2010 21:18
> To: Ian Tobin
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> 
> 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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