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Re: Slackware vanilla kernel for domU in NetBSD dom0



On Tue, 29 Mar 2011 21:34:23 +0100
Gerard Lally <gerard%netmail.ie@localhost> wrote:

> On Tue, 29 Mar 2011 12:44:53 -0700
> Dustin Marquess <dmarquess%gmail.com@localhost> wrote:
> 
> > On Tue, Mar 29, 2011 at 12:35 PM, Gerard Lally <gerard%netmail.ie@localhost>
> > wrote:
> > > While in Slackware I compiled a vanilla kernel (2.6.38.2) with
> > > all the Xen options enabled. I then copied the resulting vmlinuz
> > > kernel in Slackware's /boot directory to / in NetBSD.
> > 
> > You probably need the initrd too!
> > 
> > > I start the Slackware domU as follows:
> > >
> > >
> > > kernel = "/vmlinuz"
> > > memory = 768
> > > name = "slackware-domu"
> > > vif = [""]
> > > vif = ["bridge=bridge0"]
> > > disk = ["phy:/dev/wd0f,sda2,w", "phy:/dev/wd0j,sda5,w",
> > >        "phy:/dev/wd0k,sda6,w", "phy:/dev/wd0l,sda7,w",
> > >        "phy:/dev/wd0m,sda8,w", "phy:/dev/wd0n,sda9,w" ]
> > > root = "/dev/sda2"
> > > extra = "xencons=tty1"
> > >
> > >
> > > Note:
> > >
> > > wd0f is Slackware's /
> > > wd0j is Slackware's swap
> > > wd0k is Slackware's /tmp
> > > wd0l is Slackware's /usr
> > > wd0m is Slackware's /var
> > > wd0n is Slackware's /home
> > >
> > > However, I am getting a kernel loader error.
> > >
> > > Am I supposed to copy the vmlinuz vanilla kernel to NetBSD's /
> > > directory and keep it in Slackware's /boot directory as well?
> > 
> > Yes.  You either need to copy the kernel+initrd to somewhere local
> > on the NetBSD drive(s), or use pygrub.
> > 
> > bootloader = 'pygrub'
> > 
> > And then comment-out the kernel line.
> 
> Thank you. I followed the Slackware instructions and created an initrd
> as follows:
> 
> mkinitrd -c -k 2.6.38.2-smp -m ext4 -f ext4 -r /dev/sda2
> 
> This created an initrd.gz file in /boot. I added the relevant line to
> lilo.conf and ran lilo and Slackware still boots properly.
> 
> I then copied this initrd.gz file to / in NetBSD.
> 
> Do I need to reference this file in the domU configuration file or is
> the kernel reference line enough? I still get the following error:
> 
> Error: (2, 'Invalid kernel', 'xc_dom_find_loader:no loader found\n')
> 
> I am not sure if my physical disks are exported correctly so perhaps
> this is the problem?
> 
> I haven't looked into pygrub yet.

I am very happy to report that I have made progress with this. I had
compiled the kernel in Slackware with LZMA compression enabled, and of
course Xen was unhappy with this. I recompiled with Gzip compression
enabled instead and the Slackware domU booted up.

I also had to change the root device to /dev/xvda2 because the kernel
panicked.

I now have Slackware booting up as a domU and natively. For some reason
I can't connect to the domU with vncviewer but I think I can get over
that hurdle. I am delighted with this setup.

Thank you Dustin for your help, which alerted me to another issue I had
overlooked.

-- 
Gerard Lally

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