[Xen-users] baremetal to PV troubles

[Dylan Martin <dmartin@xxxxxxxxxxxx>]

Hi.

I've got linux system running on it's own box that I want to convert to a 
PV domU in xen.  The kernel panics after adding the xenblk module.

 Here's what I've done:

1) tar'ed up the running non-xen system and copy to dom0
2) created new LV on dom0
3) fdisked, kpartx -a , pvcreate, vgcreate, lvcreate, mount etc... 
        that LV into a normal file hierarchy. 
4) untar'ed the tar file from step 1 onto my new file heirarchy.
5) chroot to new file hierarchy
6) fiddle with /dev, /etc/modprobe, network config etc.. 
7) run mkinitrd with --with=xenblk
8) exit chroot
9) umount, vgchange -an, kpartx -d the new file hierarchy
10) copy kernel & new initrd out of new file hierarchy onto somewhere
handy on Dom0.
11) build xm config file with kernel= and ramdisk= kernel and initrd
from step 10

Obviously, this is not a detailed explanation, just an overview so
you see the general method I'm using.

When I run 'xm create -c', it runs along nicely for a bit and then...

...
Loading ext3.ko module
Loading xenblk.ko module
Registering block device major 8
blkfront: sda: barriers enabled
 sda:end_request: I/O error, dev sda, sector 0
Buffer I/O error on device sda, logical block 0
BUG: unable to handle kernel paging request at virtual address
a031dcc8
 printing eip:
ee02e928
01c96000 -> *pde = 00000000:38cda027
01c99000 -> *pme = 00000000:00000000
Oops: 0000 [#1]
SMP
last sysfs file: /block/ram0/dev
Modules linked in: xenblk ext3 jbd mbcache ehci_hcd ohci_hcd uhci_hcd
CPU:    0
EIP:    0061:[<ee02e928>]    Not tainted VLI
EFLAGS: 00010887   (2.6.20-2925.11.fc7xen #1)
EIP is at blkif_int+0x5a/0x18c [xenblk]
eax: e0009c00   ebx: c0314000   ecx: 000002c2   edx: 08000100
esi: 00000000   edi: c17160ac   ebp: c135cfc8   esp: c135cf9c
ds: 007b   es: 007b   ss: 0069
Process swapper (pid: 0, ti=c135c000 task=c12bd2e0 task.ti=c1307000)
Stack: 00000000 c135cfc8 c1036df8 00000001 00000002 00000001 08000100 c12fa6b8
       c1d22980 00000000 00000000 c135cfe0 c1047682 00000105 c12fa680 00000105
       c1d22980 c135cff8 c1048a74 c12fa6a8 c1307f18 00000105 c10489da c1307f34
Call Trace:
 [<c1005d3a>] show_trace_log_lvl+0x1a/0x2f
 [<c1005dea>] show_stack_log_lvl+0x9b/0xa3
 [<c1005f86>] show_registers+0x194/0x26a
 [<c100618d>] die+0x131/0x246
 [<c11f79d5>] do_page_fault+0xaf7/0xc7b
 [<c11f5cf5>] error_code+0x35/0x3c
 [<c1047682>] handle_IRQ_event+0x1a/0x45
 [<c1048a74>] handle_level_irq+0x9a/0xea
 [<c1007018>] do_IRQ+0xba/0xe2
 =======================
Code: e8 89 f6 8b 43 20 89 45 e0 e9 ed 00 00 00 8b 43 24 31 f6 48 23
45 e0 6b c0 6c 8d 78 40 03 7b 28 8b 17 69 c2 9c 00 00 00 89 55 ec <8b>
94 18 c8 00 00 00 8d 44 18 5c 89 45 f0 89 55 dc eb 11 8b 55
EIP: [<ee02e928>] blkif_int+0x5a/0x18c [xenblk] SS:ESP 0069:c135cf9c
 <0>Kernel panic - not syncing: Fatal exception in interrupt

Any ideas?

-Dylan



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