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

On Mon, May 17, 2010 at 09:23:53AM +0100, Ian Tobin wrote:
> #  -*- mode: python; -*-
> kernel = "/boot/vmlinuz-2.6.33.4"
> ramdisk = "/boot/initrd.img-2.6.34.4"
> #kernel = "/boot/vmlinuz-2.6.18.8-xen"
> memory = 128
> name = "dbsrv1"
> vif = ['bridge=xenbr0' ]
> disk = ['phy:/dev/XEN/dbsrv1,hda1,w','phy:/dev/XEN/dbsrv1swap,sda2,w']
>

The problem is on the disk line.
You need to use xvda1 and xvda2, not hda1 and sda2.

xvd = Xen Virtual Disk.

-- Pasi


> ip="..."
> netmask="..."
> gateway="..."
> hostname = "dbsrv1"
> root = "/dev/hda1 ro"
> extra = "3 xencons=tty"
> 
> thanks
> 
> Ian
> 
> 
> 
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: 17 May 2010 09:19
> To: Ian Tobin
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> 
> On Mon, May 17, 2010 at 09:17:24AM +0100, Ian Tobin wrote:
> > Ive never used pygrub before.
> > 
> > I did try chrooting but it was complaining about the initramfs command not 
> > being found.
> > 
> > So if the XEN stuff is ok, what else do you think it could be?
> > 
> 
> Paste your /etc/xen/<guest> cfgfile.
> 
> -- Pasi
> 
> > Thanks
> > 
> > Ian
> > 
> > 
> > 
> > -----Original Message-----
> > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > Sent: 17 May 2010 09:02
> > To: Ian Tobin
> > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > 
> > On Mon, May 17, 2010 at 08:54:35AM +0100, Ian Tobin wrote:
> > > Hi,
> > > 
> > > How do you gernerate it from DomU when it wont boot?
> > > 
> > 
> > Well.. mount + chroot + mkinitrd from dom0 might work.
> > 
> > I prefer installing domUs using the distro installer so things
> > like this get handled automatically. 
> > 
> > And I prefer using Xen pygrub so I don't have to have the kernel+initrd in 
> > dom0 at all!
> > 
> > > Here is the domU config
> > > 
> > > CONFIG_XEN=y
> > > CONFIG_XEN_MAX_DOMAIN_MEMORY=32
> > > CONFIG_XEN_SAVE_RESTORE=y
> > > CONFIG_XEN_DEBUG_FS=y
> > > CONFIG_XEN_BLKDEV_FRONTEND=y
> > >
> > 
> > So the xen-blkfront is compiled in, you don't necessarily need an initrd 
> > then.
> > 
> > 
> > > CONFIG_NETXEN_NIC=m
> > > CONFIG_XEN_NETDEV_FRONTEND=y
> > > CONFIG_XEN_KBDDEV_FRONTEND=y
> > > CONFIG_HVC_XEN=y
> > > CONFIG_XEN_FBDEV_FRONTEND=y
> > > CONFIG_XEN_BALLOON=y
> > > CONFIG_XEN_SCRUB_PAGES=y
> > > CONFIG_XEN_DEV_EVTCHN=y
> > > CONFIG_XENFS=y
> > > CONFIG_XEN_COMPAT_XENFS=y
> > > CONFIG_XEN_SYS_HYPERVISOR=y
> > > 
> > 
> > -- Pasi
> > 
> > > Thanks
> > > 
> > > Ian
> > > 
> > > 
> > > 
> > > -----Original Message-----
> > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > Sent: 17 May 2010 08:51
> > > To: Ian Tobin
> > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > 
> > > 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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