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I am attempting to use pv-grub on a stock arch linux instance on linode by following this post:-

http://forum.linode.com/viewtopic.php?p=49387

Unfortunately, I am unable to get my pv-grub enabled instance booted up.

Here's the error log I am able to retrieve via logview in linode's lish.

Xen Minimal OS!
start_info:   0xa8d000
  nr_pages:   131072  shared_inf: bf26c000
  pt_base:    0xa90000  mod_start:  0x0
  Booting 'Arch Linux  [/boot/vmlinuz-linux]'

root  (hd0)
 Filesystem type is ext2fs, using whole disk
kernel /boot/vmlinuz-linux root=/dev/xvda ro

close blk: backend at /local/domain/0/backend/vbd/3391/51712
close blk: backend at /local/domain/0/backend/vbd/3391/51728
[21800338.956906] i8042: No controller found
[21800338.998630] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[21800338.998818] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

How should I interpret this error and how do I go about fixing this so my pv-grub enabled arch linux instance can now boot properly?

UPDATE

I also notice that it claims that the filesystem type is ext2fs. Perhaps this is the problem as the disk I created on linode.com is in fact using ext3?

Calvin Cheng
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2 Answers2

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The stock arch linux does not work for me and my solution was to custom build my own kernel.

Reference - https://unix.stackexchange.com/questions/37407/learning-how-to-build-my-own-linux-kernel

Community
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Calvin Cheng
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In case anyone doesn't want to compile their own kernel, the stock kernel in Arch Linux fully supports Xen, paravirtualization, etc. and is perfectly suitable for booting with pv-grub. Here's how you can set it up (Guaranteed to work with linux-lts 3.10.40-1):

  1. On your Linode, using pacman, install the Linux kernel package of your choice. I suggest you choose one of the core packages, like linux or linux-lts. Anything more exotic might not work properly.
  2. Important! Run sudo mkinitcpio -p linux.
  3. Using pacman, remove any bootloader packages you might have installed (e.g., grub or syslinux).

  4. Create the file /boot/grub/menu.lst with the following contents. You might need to tweak this a little to match your chosen kernel package and Linode disk layout:

    # general configuration:
timeout   0
default   0
hiddenmenu

# (0) Arch Linux
title  Arch Linux LTS
root   (hd0)
kernel /boot/vmlinuz-linux-lts root=/dev/xvda rw
initrd /boot/initramfs-linux-lts.img

# (1) Arch Linux Fallback
title  Arch Linux LTS - Fallback
root   (hd0)
kernel /boot/vmlinuz-linux-lts root=/dev/xvda rw
initrd /boot/initramfs-linux-lts-fallback.img
  5. Under Linode's dashboard, click Edit to change the configuration of your chosen Linode.
  6. From Boot Settings → Kernel, select pv-grub-x86_64.
  7. Reboot your Linode, and it will boot into your new kernel!
t-richards
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