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[Xen-users] VFS: Cannot open root device and Kernel panic

To: xen list <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] VFS: Cannot open root device and Kernel panic
From: <helicoterus-elih@xxxxxxxx>
Date: Fri, 21 Dec 2007 20:04:30 +0100 (CET)
Delivery-date: Fri, 21 Dec 2007 11:05:01 -0800
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It is the third times that I try to use Xen.
I install opensuse 10.2 with its kernel. I have got a domain0. I would like to build a new domainU. I install opensuse 10.2 in /dev/hdb5 (ext3) as /, and it uses /dev/sda2 as swap partition (shared with dom0 opensuse).
I do not know what assign to root param and disk. I tried root ="/dev/hda1 ro" and disk = [ 'phy:/dev/hdb5,hda,w'] ; but does not work.
kernel = "/boot/vmlinuz-xen"
root= "/dev/hdb5 ro"
disk = [ 'phy:/dev/hdb5,hdb5,w']
memory = 64
vcpus = 1
builder = 'linux'
name = 'vm1'
vif = [ 'mac=00:16:3e:65:3a:ca' ]
localtime = 0

extra = ' TERM=xterm'

This is what appears when I launch the domain:

linux-wsbh:/home/vale # xm create -c /etc/xen/vm/vm1
Using config file "/etc/xen/vm/vm1".
Started domain vm1
Linux version (geeko@buildhost) (gcc version 4.1.2 20061115 (prerelease) (SUSE Linux)) #1 SMP Mon Nov 27 11:46:27 UTC 2006
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000004800000 (usable)
0MB HIGHMEM available.
72MB LOWMEM available.
ACPI in unprivileged domain disabled
Allocating PCI resources starting at 10000000 (gap: 04800000:fb800000)
Xen reported: 1503.407 MHz processor.
Built 1 zonelists.  Total pages: 18432
Kernel command line:  root=/dev/hdb5 ro  TERM=xterm
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 512 (order: 9, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Software IO TLB disabled
vmalloc area: c5000000-fb7fe000, maxmem 33ffe000
Memory: 61096k/73728k available (1950k kernel code, 4372k reserved, 930k data, 184k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 3771.38 BogoMIPS (lpj=7542763)
Security Framework v1.0.0 initialized
Mount-cache hash table entries: 512
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 256K
Compat vDSO mapped to fbffd000.
Checking 'hlt' instruction... OK.
SMP alternatives: switching to UP code
Freeing SMP alternatives: 12k freed
Brought up 1 CPUs
Grant table initialized
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.
Setting mem allocation to 65536 kiB
PCI: System does not support PCI
PCI: System does not support PCI
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 2048)
TCP reno registered
audit: initializing netlink socket (disabled)
audit(1198262879.124:1): 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)
rtc: IRQ 8 is not free.
Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15 (usb?)
Failed to obtain physical IRQ 6
floppy0: no floppy controllers found
RAMDISK driver initialized: 16 RAM disks of 64000K size 1024 blocksize
Xen virtual console successfully installed as tty1
Event-channel device installed.
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
Using IPI No-Shortcut mode
XENBUS: Device with no driver: device/vbd/837
XENBUS: Device with no driver: device/vif/0
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
VFS: Cannot open root device "hdb5" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
 <6>Time: xen clocksource has been installed.

Thank you all.

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