Re: [Xen-devel] Scrubbing free ram

[Bei Guan <gbtju85@xxxxxxxxx>]

>
> Now, I change my domain0 OS to fedora11_x86-64bit and I can successfully
> install the xen 4.0. However I have another problem. When I running the

So you solved your problem by building the 64-bit Dom0. Is your
userspace 64-bit or is it 32-bit? When you say 'change my domain0' was
that a re-install of Fedora Core 11?

Yes, I have re-install the 64-bit Fedora Core 11. My userspace is 64-bit now.


 

> command "xend start", I got the error messages:
>
> [root@localhost ~]# xend start
> ERROR Internal error: Could not obtain handle on privileged command

Run 'modprobe xenfs' and 'modprobe xen-evtchn'

I don't know why my Dom0 don't have the two modules. But I can find them in the source of pvops kernel.
The error of  running the two commands as following.

[root@localhost ~]# modprobe xenfs
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.
FATAL: Module xenfs not found.
[root@localhost ~]# modprobe xen-evtchn
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.
FATAL: Module xen_evtchn not found.

 

> interface (2 = No such file or directory)
> Traceback (most recent call last):
>   File "/usr/sbin/xend", line 36, in <module>
>     from xen.xend.server import SrvDaemon
>   File "usr/lib64/python2.6/site-packages/xen/xend/server/SrvDaemon.py",
> line 26, in <module>
>   File "usr/lib64/python2.6/site-packages/xen/xend/server/relocate.py", line
> 28, in <module>
>   File "usr/lib64/python2.6/site-packages/xen/xend/XendDomain.py", line 36,
> in <module>
>   File "usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py", line
> 20, in <module>
>   File "usr/lib64/python2.6/site-packages/xen/xend/image.py", line 46, in
> <module>
> xen.lowlevel.xc.Error: (1, 'Internal error', 'Could not obtain handle on
> privileged command interface (2 = No such file or directory)')
>
> I googled the problem and found it seems to be a bug, which refered here:
> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1436
>
>
>
> If I running another command "/etc/init.d/xend start", it can successfully
> start the xend service. But I can not create a PV DomU or HVM DomU. The
> error message as following.

That one is fairly easy. You don't have the right 'root' entry for your
guest (you are missing the right root="/dev/<something, something>").

It looks to be that you are trying to do '/dev/sda1' but since you
changed your disk=['...'] entry to have 'xvda', it should be
'/dev/xvda1'

Yes, I solved this problem. However, I still can not create the PV domU. The process of creating pv domU stopped at the
" * Restarting OpenBSD Secure Shell server sshd   ...done. "  Complete messages is attached. My  PV config file is:

kernel = "/boot/vmlinuz-2.6.31.13"
memory = "256"
name = "ubuntu.9-04"
vif = ['']
#dhcp = "dhcp"
disk = ['file:/root/Xen/img/ubuntu-32/ubuntu.9-04.x86.img,xvda1,w']
root = "/dev/xvda1 ro"
extra = 'xencons=tty'


 

>
> 1. Error of starting a PV DomU
> [root@localhost ubuntu-32]# xm create ubuntu.9-04.x86.xen3.cfg -c
> ……  ……
> [    1.831122] Sending DHCP requests ...
> [   14.320061] ... timed out!
> [   75.986391] IP-Config: Reopening network devices...
> [   77.488086] Sending DHCP requests ...
> [   93.965059] ... timed out!
> [  165.740440] IP-Config: Auto-configuration of network failed.
> [  165.740565] md: Waiting for all devices to be available before autodetect
> [  165.740587] md: If you don't use raid, use raid=noautodetect
> [  165.741555] md: Autodetecting RAID arrays.
> [  165.741577] md: Scanned 0 and added 0 devices.
> [  165.741596] md: autorun ...
> [  165.741614] md: ... autorun DONE.
> [  165.741921] Root-NFS: No NFS server available, giving up.
> [  165.741984] VFS: Unable to mount root fs via NFS, trying floppy.
> [  165.742429] VFS: Cannot open root device "sda1" or unknown-block(2,0)
> [  165.742452] Please append a correct "root=" boot option; here are the
> available partitions:
> [  165.742529] ca01         1025024 xvda1 driver: vbd

                                     ^^^^ - use that one instead of
sda1

> [  165.742566] Kernel panic - not syncing: VFS: Unable to mount root fs on

> unknown-block(2,0)
> [  165.742590] Pid: 1, comm: swapper Not tainted 2.6.31.13 #1
> [  165.742610] Call Trace:
> [  165.742642]  [<ffffffff81591fd2>] panic+0x75/0x130
> [  165.742674]  [<ffffffff8195fafe>] mount_block_root+0x1ce/0x1e5
> [  165.742705]  [<ffffffff8195fb80>] mount_root+0x6b/0x8b
> [  165.742734]  [<ffffffff8195fd10>] prepare_namespace+0x170/0x19d
> [  165.742765]  [<ffffffff8195efc0>] kernel_init+0x1b5/0x1c5
> [  165.742797]  [<ffffffff81033dea>] child_rip+0xa/0x20
> [  165.742827]  [<ffffffff81032fa7>] ? int_ret_from_sys_call+0x7/0x1b
> [  165.742858]  [<ffffffff8103375d>] ? retint_restore_args+0x5/0x6
> [  165.742889]  [<ffffffff81033de0>] ? child_rip+0x0/0x20
>
> (Attached is the complete messages)
>
> 2. Error of starting a HVM DomU
> [root@localhost windowsxp]# xm create winxp2_xen4.hvm
> Using config file "./winxp2_xen4.hvm".
> Error: Domain 'WinXP_HVMDomain' does not exist.
>
> ("WinXP_HVMDomain" is my HVM DomU name)

No idea without cranking up some debug options. Look up
http://wiki.xensource.com/xenwiki/XenParavirtOps at the debug option.

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