Xen

[fedot]

Hi everyone!
Today I tried to compile XEN but nothing happened.
XEN 4.0.1.7 for Fedora 14
Kernel 2.6.32.27

My menu.lst:


# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/mapper/vg_vm-lvroot
# initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.35.11-83.fc14.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.35.11-83.fc14.x86_64 ro root=/dev/mapper/vg_vm-lvroot rd_LVM_LV=vg_vm/lvroot rd_LVM_LV=vg_vm/lvswap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us rhgb quiet
initrd /initramfs-2.6.35.11-83.fc14.x86_64.img
title Xen (2.6.32.27.x86_64)
root (hd0,0)
kernel /xen.gz dom0_mem=512M loglvl=all guest_loglvl=all
module /vmlinuz-2.6.32.27 ro root=/dev/mapper/vg_vm-lvroot rd_LVM_LV=vg_vm/lvroot rd_LVM_LV=vg_vm/lvswap nomodtest
module /initramfs-2.6.32.27.img

assembled without any errors but when booting the kernel, got out the following error:

VFS: Cannot open root device "mapper/vg_vm-lvroot" or unknown-block (0,0)
Please append a correct "root=" boot option; here are the available partitions :
0800 156290904 sad driver : sd
0801 2097152 sda1
0802 154191872 sda 2
0b00 1048575 sr0 driver : sr
Kernel panic - not syncing : VFS : Unable to mount root fs on unknown-block (0,0)
Pid: 1, comm: swapper Not tainted 2.6.32.27 #1
Call Trace:
[<ffffffff8147a53b>] panic+0x7a/0x13a
[<ffffffff8198710e>] mount_block_root+0x255/0x280
[<ffffffff819872c7>] mount_root+0x56/0x5a
[<ffffffff8198743b>] prepare_namespace+0x170/0x19d
[<ffffffff81986de6>] kernel_init+0x1b0/0x1c4
[<ffffffff81013eea>] child_rip+0xa/0x20
[<ffffffff81013850>] ? restore_args+0x0/0x30
[<ffffffff81013ee0>] ? child_rip+0x0/0x20



With what it could be linked?
How do I fix this?

Best Regards,
Fedor

[jpollard]

How did you compile Xen?

Did you do a "make install" pass?

How about a "make modules_install" pass?

[fedot]

Originally Posted by jpollard

How did you compile Xen?

Did you do a "make install" pass?

How about a "make modules_install" pass?

like so:

make oldconfig
make -j8 bzImage && make -j8 modules && make modules_install

[jpollard]

left out the "make install".

This is what makes the initrd and puts the kernel in /boot.

The initial root is the initrd which is then used to load needed drivers to get the real root (the initrd is a cpio file that is copied to a ramfs during
boot, then the kernel loads modules for the root filesystem from there)

Unless things have changed a lot...

[fedot]

Originally Posted by jpollard

left out the "make install".

This is what makes the initrd and puts the kernel in /boot.

The initial root is the initrd which is then used to load needed drivers to get the real root (the initrd is a cpio file that is copied to a ramfs during
boot, then the kernel loads modules for the root filesystem from there)

Unless things have changed a lot...

A lot of thanks! It's works.

[fedot]

Hi all, a new problem arose.
The kernel I compile and run again for it thanks!

The problem is that I want to get information about XEN finally get:

# xm list
Error: Unable to connect to xend: No such file or directory. Is xend running?

Found it in the folder:

# whereis xend
xend: /usr/sbin/xend

Tried to run as a result:

# /usr/sbin/xend
ERROR Internal error: Could not obtain handle on privileged command interface (2 = No such file or directory)
Traceback (most recent call last):
File "/usr/sbin/xend", line 16, in <module>
from xen.xend.server import SrvDaemon
File "/usr/lib64/python2.7/site-packages/xen/xend/server/SrvDaemon.py", line 26, in <module>
import relocate
File "/usr/lib64/python2.7/site-packages/xen/xend/server/relocate.py", line 28, in <module>
from xen.xend import XendDomain
File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomain.py", line 36, in <module>
from xen.xend import XendOptions, XendCheckpoint, XendDomainInfo
File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py", line 20, in <module>
from xen.xend import balloon, sxp, image
File "/usr/lib64/python2.7/site-packages/xen/xend/image.py", line 46, in <module>
xc = xen.lowlevel.xc.xc()
xen.lowlevel.xc.Error: (1, 'Internal error', 'Could not obtain handle on privileged command interface (2 = No such file or directory)')

Xen installed from the Fedora 14 repositories:

# rpm -qa | grep xen
xen-libs-4.0.1-7.fc14.x86_64
xen-4.0.1-7.fc14.x86_64
xen-runtime-4.0.1-7.fc14.x86_64
xen-hypervisor-4.0.1-7.fc14.x86_64
xen-doc-4.0.1-7.fc14.x86_64
xen-devel-4.0.1-7.fc14.x86_64
xen-licenses-4.0.1-7.fc14.x86_64

My grub boot list:

# cat /boot/grub/menu.lst

default=0
timeout=3
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.32.27)
root (hd0,0)
kernel /vmlinuz-2.6.32.27 ro root=/dev/mapper/vg_vm-lvroot rd_LVM_LV=vg_vm/lvroot rd_LVM_LV=vg_vm/lvswap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us rhgb quiet
initrd /initramfs-2.6.32.27.img

As I understand there is no value for kernel XEN?

Best Regards,
Fedot

---------- Post added at 09:52 PM ---------- Previous post was at 07:05 PM ----------

yes, problem solved:

title Fedora (2.6.32.27)
root (hd0,0)
kernel /xen.gz dom0_mem=512M loglvl=all guest_loglvl=all
module /vmlinuz-2.6.32.27 ro root=/dev/mapper/vg_vm-lvroot rd_LVM_LV=vg_vm/lvroot nomodeset
module /initramfs-2.6.32.27.img

A lot of thanks! It's works.