Hello,
I am trying to boot a FC6 domU on Xen 3.2 (compiled on a FC6 system).

After compiling Xen 3.2 successfully on FC6 and making the ramdisk, I modified the conf.grub as shown below. With this, I was able to boot xen.

------------------------------

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# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:You do not have a /boot partition.This means that
#all kernel and initrd paths are relative to /, eg.
#root (hd0,0)
#kernel /boot/vmlinuz-version ro root=/dev/sda1
#initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title Xen 3.2 (2.6.18.8-xen)
root (hd0,0)
kernel /boot/xen.gz dom0_mem=1024M console=vga
module /boot/vmlinuz-2.6.18.8-xen ro root=LABEL=/1 console=tty0
module /boot/initrd-3.2-xen.img
title Fedora Core (2.6.18-1.2798.fc6)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-1.2798.fc6 ro root=LABEL=/1 rhgb quiet
initrd /boot/initrd-2.6.18-1.2798.fc6.img
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Then, I created a domU image as in the uer manual for v3.0.

1) I created a blank discimage fc6_domudisk and monted in in /mnt
2) I copied /{root, dev,var,etc,usr,bin,sbin,lib} to /mnt
3) I makde the {home, proc, sys, tmp} directories inside /mnt
4) I modified the mnt/etc/fstab as follows
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/dev/sda1/ext3defaults1 1
devpts/dev/ptsdevptsgid=5,mode=6200 0
tmpfs/dev/shmtmpfsdefaults0 0
proc/procprocdefaults0 0
sysfs/syssysfsdefaults0 0

---------------------------------------------------------------------------------------------------------------

5) With this I tried to bring up the domU using the following configuration file. From what I understand, I can use the dom0 kernel itself for domU.

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kernel = "/boot/vmlinuz-2.6.18.8-xen"
memory = 256
name = "fc6"
vif = [ 'bridge=xenbr0' ]
disk = [ 'file:/second/fc6_domudisk,sda1,w' ]
root = "/dev/sda1 ro"

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But the boot fails with a kernel panic. The boot messages are listed below.

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Using config file "./file-config-rh9_diskimg".
Started domain fc6_new
Linux version 2.6.18.8-xen (root@xxxxxxxxxxxxxxxxxxxxx) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-13)) #1 SMP Mon Mar 17 20:26:25 EDT 2008
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 0000000010800000 (usable)
0MB HIGHMEM available.
264MB LOWMEM available.
ACPI in unprivileged domain disabled
Allocating PCI resources starting at 20000000 (gap: 10800000:ef800000)
Detected 4232.073 MHz processor.
Built 1 zonelists.Total pages: 67584
Kernel command line: root=/dev/sda1 ro
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 2048 (order: 11, 8192 bytes)
Xen reported: 3200.118 MHz processor.
Console: colour dummy device 80x25
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Software IO TLB disabled
vmalloc area: d1000000-f51fe000, maxmem 2d7fe000
Memory: 255340k/270336k available (2056k kernel code, 6800k reserved, 716k data, 196k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
calibrate_delay_direct() failed to get a good estimate for loops_per_jiffy.
Probably due to long platform interrupts. Consider using "lpj=" boot option.
Security Framework v1.0.0 initialized
Capability LSM initialized
Mount-cache hash table entries: 512
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 2048K
Checking 'hlt' instruction... OK.
SMP alternatives: switching to UP code
Freeing SMP alternatives: 16k freed
Brought up 1 CPUs
migration_cost=0
NET: Registered protocol family 16
Brought up 1 CPUs
PCI: setting up Xen PCI frontend stub
ACPI: Interpreter disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI: disabled
xen_mem: Initialising balloon driver.
PCI: System does not support PCI
PCI: System does not support PCI
NET: Registered protocol family 2
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 16384 bind 8192)
TCP reno registered
IA-32 Microcode Update Driver: v1.14a-xen <tigran@xxxxxxxxxxx>
audit: initializing netlink socket (disabled)
audit(1423925502.304:1): initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15 (usb?)
Failed to obtain physical IRQ 6
floppy0: Unable to grab DMA2 for the floppy driver
floppy0: no floppy controllers found
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: loaded (max 8 devices)
Xen virtual console successfully installed as xvc0
Event-channel device installed.
netfront: Initialising virtual ethernet driver.
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
PNP: No PS/2 controller found. Probing ports directly.
i8042.c: No controller found.
mice: PS/2 mouse device common for all mice
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
NET: Registered protocol family 1
NET: Registered protocol family 17
Using IPI No-Shortcut mode
xen-vbd: registered block device major 8
blkfront: sda1: barriers enabled
XENBUS: Device with no driver: device/console/0
BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
EDD information not available.
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
EXT2-fs warning (device sda1): ext2_fill_super: mounting ext3 filesystem as ext2
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 196k freed
Kernel panic - not syncing: Attempted to kill init!

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It would be great if someone could help me out.

Thanks,
Girish

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