[Fedora-xen] DomU problem with tap:aio and xvdN.

[Gary W. Smith]

Hello, 

In a nutshell, I can't get DomU's to work with xvdN and tap:aio under
FC6.2869.  I have also tried to get them to work with XenSource 3.0.4.

I've been asking this in the xen-users group but I haven't had any
positive response.  I have the following DomU's that I'm testing with:
FC4/5/6, CentOS4.  In general, they all seem to have the same problems.

The problem is that when I reference the FC6 Xen boot kernel in the
kernel config line for the DomU it kernel panics.  I have copied
/lib/modules/* (FC6 and XenSource) to the DomU as well for testing.  If
I do sdN and file it all works fine, but only for XenSource kernel.

At the Dom0 level we are booting to FC.2869 and only referencing the
XenSource 3.0.4 images at the DomU config file level.

Am I missing something fundamental?  I have also ran into this problem
with the jailtime.org images as well.  

FC6 kernel:
(kernel         = '/boot/vmlinuz-2.6.18-1.2869.fc6xen')

XENBUS: Device with no driver: device/vbd/51713
XENBUS: Device with no driver: device/vbd/51714
XENBUS: Device with no driver: device/vif/0
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
VFS: Cannot open root device "xvda1" 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)

XenSource 3.0.4 kernel:
(kernel         = '/xen/xen-3.0.4/boot/vmlinuz-2.6-xen')

md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
WARNING: g.e. still in use!
WARNING: leaking g.e. and page still in use!
end_request: I/O error, dev xvda1, sector 2
EXT2-fs: unable to read superblock
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(202,1)


Overall config file:

name           = 'fedora4'
memory         = '256'
disk           = [ 'file:/xen-build/fedora4/xen-D0.img,xvda1,w' ,
'file:/xen-build/fedora4/xen-swap.img,xvda2,w' ]
#disk           = [
'tap:aio:/xen-build/fedora4/xen-D0.img,xvda1,w','tap:aio:/xen-build/fedo
ra4/xen-swap.img,xvda2,w' ]
root           = '/dev/xvda1 ro'
vif            = [ 'mac=00:16:e6:CD:49:5B' ]
kernel         = '/xen/xen-3.0.4/boot/vmlinuz-2.6-xen'
#kernel         = '/boot/vmlinuz-2.6.18-1.2869.fc6xen'
on_reboot      = 'restart'
on_crash       = 'restart'
extras         = 'console=xvc0'