Re: [Xen-users] Strange interaction from grub2 and XEN

[Marco Nenciarini <mnencia@xxxxxxxxxxxxxx>]

Marco Nenciarini ha scritto:
> I'm testing how xen and grub2 can work together.
>
> I'm using xen 3.4.2 and grub2 1.97+20091115-1 from debian sid.
>
> After many failed attempts I've discovered that on my system the first 
> argument that grub2 should pass to the linux kernel is lost.
> This is my working grub2 configuration:
>
> menuentry "Xen 3.4.0 / Debian GNU/Linux, Linux 2.6.31-1-xen-amd64" {
>     insmod xfs
>     set root=(hd0,2)
>     multiboot /boot/xen-3.4-amd64.gz
>     module /boot/vmlinuz-2.6.31-1-xen-amd64 dummy=dummy 
> root=UUID=e9ed5af4-0503-4314-9d28-415a0eb7b0a0 ro quiet
>     module /boot/initrd.img-2.6.31-1-xen-amd64
> }
>
> Looking in /proc/cmdline, there isn't any dummy=dummy argument
>
> mnencia@manwe:/tmp$ cat /proc/cmdline
> root=UUID=e9ed5af4-0503-4314-9d28-415a0eb7b0a0 ro quiet
>
> Before the addition of dummy=dummy in front of line, the missing 
> argument was the root=*, so my initrd had no idea of which root it have 
> to mount.
> BTW, the problem happens with both oldschool kernels and pvops ones.
>
> I've googled around a bit, but I haven't found anything about this issue.
I've just found something on this issue in a debian bug report

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555985#10

Here I quote the interesting part (Felix Zielcke talking of grub):

        With newest releases you have to double the filename both in multiboot
	and module line or add a dummy parameter but the filename would 
reassemble GRUB Legacy's behaviour.
        I.e. with 1.97 change it to
            multiboot /xen-3.4-amd64.gz /xen-3.4-amd64.gz dom0_mem=512M
	    module /vmlinuz-2.6.31.5-xen-00513-g47dfde5 
/vmlinuz-2.6.31.5-xen-00513-g47dfde5 nomodeset
So is a known issue/feature. Maybe some record of this are needed in xen 
wiki.
Kind Regards,
Marco

P.S: I'm still curious on why grub2 behaves in this manner.

--
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|    Marco Nenciarini    | Debian/GNU Linux Developer - Plug Member |
| mnencia@xxxxxxxxxxxxxx | http://www.prato.linux.it/~mnencia       |
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