Problems with xen and linux 2.26.32 kernels for dom0

[Jia Rao <rickenrao@gmail.com>]

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Hi all,

I used to use xen 3.4.2 and linux 2.6.18-xen kernels for both dom0 and domU,
without any problems.

Recently, I need to try io bandwidth control like dm-ioband in the new
kernel 2.6.32 (dm-ioband has patches for this kernel). It gave me a lot of
problems if I want to upgrade the dom0 to 2.6.32. The following is what I
tried and the errors.


Xen: 3.4.3 (I need to stick with 3.4.x. 3.4.3 is the one that can run pvops)

*First approach:*
I tried to download pvops from the git repository xen/stable-2.6.32.x. The
compilation was OK, but the initrd has a lot missing dependencies. I tried
to use --builtin to claim those missing modules in kernel. However, with the
generated initrd, dom0 can not boot. I got the error: *unable to locate
IOAPIC for GSIx and mount: could not find filesystem: /dev/root*.
I enabled : CONFIG_SYSFS_DEPRECATED=y,  CONFIG_SYSFS_DEPRECATED_V2=y and
tried to use root=/dev/sdax or root=LABEL=/. No luck.

*Second approach:*
Then I switched to the forward ported 2.6.32.13 kernel generated from the
gentoo xen kernel patches.

Still xen 3.4.3. After compilation, dom0 booted successfully. However I
previous domU which has 2.6.18-xen kernels can not boot. It has the same
error: *mount: could not find filesystem: /dev/root
*Do I need to create a initrd for the domU? I didnt need one when dom0 is
2.6.18-xen kernel.
*
*BTW. I dont see a PARAVIRT_GUEST config option in the forward ported 2.6.32
kernel*.

*Any ideas?
Thanks in advance!*
*

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