pvgrub and single partition VM

pvgrub and single partition VM

[Guillaume Rousse]

Hello list.

I just tried pvgrub with a single-partition host:
kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra = "(hd0,0)/boot/grub/menu.lst"
root = "/dev/sda1 ro"
extra = "xencons=tty console=tty"
memory = 512
maxmem = 1024
name = "cendrillon"
uuid = "46b9ff12-7ceb-4139-bbff-47117e650f25"
disk = [ 'phy:/dev/iscsi/sn.101200926/lun9/part1,sda1,w' ]
vif = [ 'mac=00:16:3e:00:00:1a, bridge=hebergement' ]

However, it can't read menu.lst file. And any attempt to load it 
interactively fails:

grubdom> configfile (hd0,0)/boot/grub/menu.lst 


Error 5: Partition table invalid or corrupt

The messages seems to imply pvgrub expect to read a partition table, 
meaning a whole disk has to be exported to the virtual host, and not a 
single partition ?

-- 
Guillaume Rousse
Service des Moyens Informatiques
INRIA Saclay - Ile de France
Tel: 01 69 35 69 62

Re: pvgrub and single partition VM

[Guillaume Rousse]

Samuel Thibault a écrit :
> Guillaume Rousse, le Tue 20 Jan 2009 11:57:51 +0100, a écrit :
>> extra = "(hd0,0)/boot/grub/menu.lst"
>>
>> The messages seems to imply pvgrub expect to read a partition table, 
>> meaning a whole disk has to be exported to the virtual host, and not a 
>> single partition ?
> 
> No, you _told_ it so. Use
> 
> extra = "(hd0)/boot/grub/menu.lst"
> 
> if you're giving the partition itself.
It seems logic, but doesn't work much better:
grubdom> configfile (hd0)/boot/grub/menu.lst
Error 17: Cannot mount selected partition

The logs doesn't show anything suspect:
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:111) 
XendDomainInfo.create_from_dict({'vcpus_params': {'cap': 0, 'weight': 
256}, 'PV_args': 'root=/dev/sda1 ro xencons=tty console=tty', 
'features': '', 'cpus': [[]], 'paused': 0, 'domid': 80, 'shutdown': 0, 
'VCPUs_live': 1, 'PV_bootloader': '', 'actions_after_crash': 'restart', 
'vbd_refs': ['1e3f126f-66ac-3ea0-e0f2-6170332fd590'], 'PV_ramdisk': '', 
'is_control_domain': False, 'name_label': 'cendrillon', 
'VCPUs_at_startup': 1, 'HVM_boot_params': {}, 'platform': {}, 
'PV_kernel': '/usr/lib/xen/boot/pv-grub-x86_64.gz', 'console_refs': 
['1a37ba6d-3385-1eaa-90ea-89fafba823a3'], 'online_vcpus': 1, 'blocked': 
0, 'on_xend_stop': 'ignore', 'memory_static_min': 0, 'HVM_boot_policy': 
'', 'shutdown_reason': 3, 'VCPUs_max': 1, 'start_time': 
1232462393.5077569, 'memory_static_max': 1073741824, 
'actions_after_shutdown': 'destroy', 'on_xend_start': 'ignore', 
'crashed': 0, 'memory_dynamic_max': 536870912, 'actions_after_suspend': 
'', 'is_a_template': False, 'PV_bootloader_args': '', 
'memory_dynamic_min': 536870912, 'uuid': 
'46b9ff12-7ceb-4139-bbff-47117e650f25', 'cpu_time': 89.821253213999995, 
'shadow_memory': 0, 'dying': 0, 'vcpu_avail': 1, 'notes': {}, 
'other_config': {}, 'running': 0, 'actions_after_reboot': 'restart', 
'vif_refs': ['ed147c84-d62c-255e-19b4-1f64a4fe8de4'], 'target': 0, 
'vtpm_refs': [], 'devices': {'1e3f126f-66ac-3ea0-e0f2-6170332fd590': 
('vbd', {'uuid': '1e3f126f-66ac-3ea0-e0f2-6170332fd590', 'bootable': 1, 
'devid': 2049, 'driver': 'paravirtualised', 'dev': 'sda1', 'uname': 
'phy:/dev/iscsi/sn.101200926/lun9/part1', 'mode': 'w'}), 
'ed147c84-d62c-255e-19b4-1f64a4fe8de4': ('vif', {'bridge': 
'hebergement', 'mac': '00:16:3e:00:00:1a', 'devid': 0, 'uuid': 
'ed147c84-d62c-255e-19b4-1f64a4fe8de4'}), 
'1a37ba6d-3385-1eaa-90ea-89fafba823a3': ('console', {'other_config': {}, 
'protocol': 'vt100', 'uuid': '1a37ba6d-3385-1eaa-90ea-89fafba823a3', 
'location': '2'})}})
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:2028) 
XendDomainInfo.constructDomain
[2009-01-20 15:41:26 10151] DEBUG (balloon:132) Balloon: 559836 KiB 
free; need 2048; done.
[2009-01-20 15:41:26 10151] DEBUG (XendDomain:447) Adding Domain: 81
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:2134) 
XendDomainInfo.initDomain: 81 256
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:2215) 
_initDomain:shadow_memory=0x0, memory_static_max=0x40000000, 
memory_static_min=0x0.
[2009-01-20 15:41:26 10151] DEBUG (balloon:132) Balloon: 559828 KiB 
free; need 528384; done.
[2009-01-20 15:41:26 10151] INFO (image:166) buildDomain os=linux dom=81 
vcpus=1
[2009-01-20 15:41:26 10151] DEBUG (image:631) domid          = 81
[2009-01-20 15:41:26 10151] DEBUG (image:632) memsize        = 512
[2009-01-20 15:41:26 10151] DEBUG (image:633) image          = 
/usr/lib/xen/boot/pv-grub-x86_64.gz
[2009-01-20 15:41:26 10151] DEBUG (image:634) store_evtchn   = 1
[2009-01-20 15:41:26 10151] DEBUG (image:635) console_evtchn = 2
[2009-01-20 15:41:26 10151] DEBUG (image:636) cmdline        = 
root=/dev/sda1 ro xencons=tty console=tty
[2009-01-20 15:41:26 10151] DEBUG (image:637) ramdisk        =
[2009-01-20 15:41:26 10151] DEBUG (image:638) vcpus          = 1
[2009-01-20 15:41:26 10151] DEBUG (image:639) features       =
[2009-01-20 15:41:26 10151] INFO (XendDomainInfo:1900) createDevice: 
console : {'other_config': {}, 'protocol': 'vt100', 'uuid': 
'1a37ba6d-3385-1eaa-90ea-89fafba823a3', 'location': '2'}
[2009-01-20 15:41:26 10151] DEBUG (DevController:122) DevController: 
writing {'protocol': 'x86_64-abi', 'state': '1', 'backend-id': '0', 
'backend': '/local/domain/0/backend/console/81/0'} to 
/local/domain/81/device/console/0.
[2009-01-20 15:41:26 10151] DEBUG (DevController:124) DevController: 
writing {'domain': 'cendrillon', 'frontend': 
'/local/domain/81/device/console/0', 'uuid': 
'1a37ba6d-3385-1eaa-90ea-89fafba823a3', 'frontend-id': '81', 'state': 
'1', 'location': '2', 'online': '1', 'protocol': 'vt100'} to 
/local/domain/0/backend/console/81/0.
[2009-01-20 15:41:26 10151] INFO (XendDomainInfo:1900) createDevice: vbd 
: {'uuid': '1e3f126f-66ac-3ea0-e0f2-6170332fd590', 'bootable': 1, 
'devid': 2049, 'driver': 'paravirtualised', 'dev': 'sda1', 'uname': 
'phy:/dev/iscsi/sn.101200926/lun9/part1', 'mode': 'w'}
[2009-01-20 15:41:26 10151] DEBUG (DevController:122) DevController: 
writing {'virtual-device': '2049', 'device-type': 'disk', 'protocol': 
'x86_64-abi', 'backend-id': '0', 'state': '1', 'backend': 
'/local/domain/0/backend/vbd/81/2049'} to /local/domain/81/device/vbd/2049.
[2009-01-20 15:41:26 10151] DEBUG (DevController:124) DevController: 
writing {'domain': 'cendrillon', 'frontend': 
'/local/domain/81/device/vbd/2049', 'uuid': 
'1e3f126f-66ac-3ea0-e0f2-6170332fd590', 'dev': 'sda1', 'state': '1', 
'params': '/dev/iscsi/sn.101200926/lun9/part1', 'mode': 'w', 'online': 
'1', 'frontend-id': '81', 'type': 'phy'} to 
/local/domain/0/backend/vbd/81/2049.
[2009-01-20 15:41:26 10151] INFO (XendDomainInfo:1900) createDevice: vif 
: {'bridge': 'hebergement', 'mac': '00:16:3e:00:00:1a', 'devid': 0, 
'uuid': 'ed147c84-d62c-255e-19b4-1f64a4fe8de4'}
[2009-01-20 15:41:26 10151] DEBUG (DevController:122) DevController: 
writing {'mac': '00:16:3e:00:00:1a', 'handle': '0', 'protocol': 
'x86_64-abi', 'backend-id': '0', 'state': '1', 'backend': 
'/local/domain/0/backend/vif/81/0'} to /local/domain/81/device/vif/0.
[2009-01-20 15:41:26 10151] DEBUG (DevController:124) DevController: 
writing {'bridge': 'hebergement', 'domain': 'cendrillon', 'handle': '0', 
'uuid': 'ed147c84-d62c-255e-19b4-1f64a4fe8de4', 'script': 
'/etc/xen/scripts/vif-bridge', 'mac': '00:16:3e:00:00:1a', 
'frontend-id': '81', 'state': '1', 'online': '1', 'frontend': 
'/local/domain/81/device/vif/0'} to /local/domain/0/backend/vif/81/0.
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:2729) Storing VM 
details: {'on_xend_stop': 'ignore', 'shadow_memory': '0', 'uuid': 
'46b9ff12-7ceb-4139-bbff-47117e650f25', 'on_reboot': 'restart', 
'start_time': '1232462486.58', 'on_poweroff': 'destroy', 
'on_xend_start': 'ignore', 'on_crash': 'restart', 'xend/restart_count': 
'0', 'vcpus': '1', 'vcpu_avail': '1', 'image': "(linux (kernel 
/usr/lib/xen/boot/pv-grub-x86_64.gz) (args 'root=/dev/sda1 ro 
xencons=tty console=tty') (notes))", 'name': 'cendrillon'}
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:1359) Storing domain 
details: {'console/ring-ref': '3844027', 'console/port': '2', 'name': 
'cendrillon', 'console/limit': '1048576', 'vm': 
'/vm/46b9ff12-7ceb-4139-bbff-47117e650f25', 'domid': '81', 'store/port': 
'1', 'cpu/0/availability': 'online', 'memory/target': '524288', 
'control/platform-feature-multiprocessor-suspend': '1', 
'store/ring-ref': '3557963', 'console/type': 'xenconsoled'}
[2009-01-20 15:41:26 10151] DEBUG (DevController:155) Waiting for 
devices vif.
[2009-01-20 15:41:26 10151] DEBUG (XendDomainInfo:1443) 
XendDomainInfo.handleShutdownWatch
[2009-01-20 15:41:26 10151] DEBUG (DevController:160) Waiting for 0.
[2009-01-20 15:41:26 10151] DEBUG (DevController:645) 
hotplugStatusCallback /local/domain/0/backend/vif/81/0/hotplug-status.
[2009-01-20 15:41:26 10151] DEBUG (DevController:659) 
hotplugStatusCallback 1.
[2009-01-20 15:41:27 10151] DEBUG (DevController:155) Waiting for 
devices vscsi.
[2009-01-20 15:41:27 10151] DEBUG (DevController:155) Waiting for 
devices vbd.
[2009-01-20 15:41:27 10151] DEBUG (DevController:160) Waiting for 2049.
[2009-01-20 15:41:27 10151] DEBUG (DevController:645) 
hotplugStatusCallback /local/domain/0/backend/vbd/81/2049/hotplug-status.
[2009-01-20 15:41:27 10151] DEBUG (DevController:659) 
hotplugStatusCallback 1.
[2009-01-20 15:41:27 10151] DEBUG (DevController:155) Waiting for 
devices irq.
[2009-01-20 15:41:27 10151] DEBUG (DevController:155) Waiting for 
devices vkbd.
[2009-01-20 15:41:27 10151] DEBUG (DevController:155) Waiting for 
devices vfb.
[2009-01-20 15:41:27 10151] DEBUG (DevController:155) Waiting for 
devices console.

And I can mount the partition from dom0 without problem. I have to check 
if ext3 support is not missing from pvgrub, but it's statically build, 
and I don't find any runtime-option for this, so I guess I have to check 
build logs.
-- 
Guillaume Rousse
Service des Moyens Informatiques
INRIA Saclay - Ile de France
Tel: 01 69 35 69 62

Re: pvgrub and single partition VM

[Guillaume Rousse]

Samuel Thibault a écrit :
> Samuel Thibault, le Tue 20 Jan 2009 16:17:44 +0100, a écrit :
>> Guillaume Rousse, le Tue 20 Jan 2009 15:48:55 +0100, a écrit :
>>> And I can mount the partition from dom0 without problem. I have to check 
>>> if ext3 support is not missing from pvgrub,
>> There is no need for any particular support for ext3, as while unmounted
>> that's just ext2.  And the 256byte inode patch is applied while
>> building.  I thus wonder what the problem can be.
> 
> I've just checked again, I could run configfile (hd0)/boot/blabla on a
> freshly formatted ext3 volume.  In case you are using some non-default
> option that annoys grub, could you send us the output of
> tune2fs -l yourpartition
> ?
Sorry for the delay, I've been occupied by other task.

Here it is:
[root@sequoia ~]# tune2fs -l /dev/iscsi/sn.101200926/lun9/part1
tune2fs 1.41.2 (02-Oct-2008)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          9c8962e1-d521-4bbf-8dad-c92b0077d61e
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index 
filetype sparse_super large_file
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1310720
Block count:              5242876
Reserved block count:     262143
Free blocks:              5059920
Free inodes:              1279106
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1022
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Filesystem created:       Tue Feb  3 15:42:35 2009
Last mount time:          Tue Feb  3 15:50:22 2009
Last write time:          Tue Feb  3 15:58:30 2009
Mount count:              2
Maximum mount count:      29
Last checked:             Tue Feb  3 15:42:35 2009
Check interval:           15552000 (6 months)
Next check after:         Sun Aug  2 16:42:35 2009
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      65b6279d-5265-40b1-9e16-afbf6335005f
Journal backup:           inode blocks

This is an ISCSI device.