Re: [Xen-users] domU can not start in Xen 4.0.1-rc3-pre using ta

To:	luis.silva@xxxxxxxxxxxxx
Subject:	Re: [Xen-users] domU can not start in Xen 4.0.1-rc3-pre using tapdisk
From:	Jia Rao <rickenrao@xxxxxxxxx>
Date:	Wed, 23 Jun 2010 10:51:22 -0400
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Wed, 23 Jun 2010 07:54:44 -0700
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Yes, that solves the problem.

Thanks a lot.

BTW. what configuration will lead me to the blktap (blktap1) driver instead of the new blktap2 driver?

On Tue, Jun 22, 2010 at 6:57 PM, Luís Silva <luis.silva@xxxxxxxxxxxxx> wrote:

Hello,

I think that in order to use tap devices with pvops kernel you have to use "tap2:aio:path_to_file". At least it works for me... Even for 4.0.1 rc2 I had to use "tap2:tapdisk:aio:...".

Luís

On Tue, 2010-06-22 at 11:01 -0400, Jia Rao wrote:

The domU is using pygrub to boot its own 2.6.18.8-xen kernel. It can be booted successfully under 2.6.18.8-xen dom0 and xen 3.3.1.

However when upgrade dom0 to 2.6.32.15 and xen 4.0.1-rc3-pre, the domU can not boot with tapdisk. I am wondering it is something related to the blktap driver.

When using tap:aio: PATH/disk.img in domU disk configuration, the boot process hanged at a prompt:

XENBUS: Waiting for devices to initialise: 295s...290s...

Then after reboot, the domU can not mount the filesystem /dev/root and kernel panic.

When using tap:tapdisk:aio PATH/disk.img. the booting process terminated at a error:

Error: [Errno 2] No such file or directory: 'aio:/PATH/disk.img'

When using file:PATH/disk.img, domU can boot successfully.

Thus I am afraid it is somethin wrong with tapdisk driver in dom0

FYI

dom0: 2.6.32.15 centos 5.4

dom0 config:

CONFIG_XEN_BALLOON=y

CONFIG_XEN_SCRUB_PAGES=y

CONFIG_XEN_DEV_EVTCHN=y

CONFIG_XEN_BACKEND=y

CONFIG_XEN_NETDEV_BACKEND=y

CONFIG_XEN_BLKDEV_BACKEND=y

CONFIG_XEN_BLKDEV_TAP=m

CONFIG_XEN_BLKBACK_PAGEMAP=y

CONFIG_XEN_PCIDEV_BACKEND=y

CONFIG_XEN_PCIDEV_BACKEND_VPCI=y

CONFIG_XEN_BLKDEV_FRONTEND=m

CONFIG_XEN_NETDEV_FRONTEND=m

I did load the modules: blktap xen_blkfront xen_netfront before starting xend.

xen: 4.0.1-rc3-pre

any ideas?

Thanks.
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Re: [Xen-users] domU can not start in Xen 4.0.1-rc3-pre using tapdisk