Re: [Xen-users] blktapctrl not running

[Mark Pryor <tlviewer@xxxxxxxxx>]

--- On Mon, 6/13/11, XU, Jiangyan <dennis84225@xxxxxxxxx> wrote:

From: XU, Jiangyan <dennis84225@xxxxxxxxx>
Subject: Re: [Xen-users] blktapctrl not running
To: "Mark Pryor" <tlviewer@xxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Date: Monday, June 13, 2011, 12:40 PM

Hi Mark,
Thanks for your reply.
I am aware of this issue and I compiled kernel following exactly instructions 
here:http://wiki.xensource.com/xenwiki/XenParavirtOps


So the kernel is 
(source=git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git, branch=xen/stable-2.6.32.x)
 with the CONFIG_* enabled as per the above wiki, plus 

CONFIG_XEN_BLKDEV_TAP=y
CONFIG_XEN_BLKDEV_TAP2=y,although the  CONFIG_XEN_BLKDEV_TAP2=y line got 
stripped out during the 'make' process.
I can see /dev/blktap-control, /dev/xen/blktap-2/control exist.
----------

do you start your VM with xm or xl? If you use xm, are services configured 
close to this?

--------------- xen services ----------
sysv-rc-conf --list | grep xen
xen-watchdog
xencommons   0:off      1:on    2:on    3:on    4:on    5:on    6:off
xend         0:off      1:off   2:on    3:on    4:on    5:on    6:off
xendomains   0:off      1:off   2:on    3:on    4:on    5:on    6:off
------------------- snip ----------

tapdisk in processes
disk = [ 'tap2:aio:/data2/kvm/xp.img,hda,w' ]

blktapctrl in processes (after VM launches)
disk = [ 'tap:aio:/data2/kvm/xp.img,hda,w']

-- 
Mark



On Mon, Jun 13, 2011 at 3:15 PM, Mark Pryor <tlviewer@xxxxxxxxx> wrote:




--- On Mon, 6/13/11, XU, Jiangyan <dennis84225@xxxxxxxxx> wrote:



From: XU, Jiangyan <dennis84225@xxxxxxxxx>

Subject: [Xen-users] blktapctrl not running

To: xen-users@xxxxxxxxxxxxxxxxxxx

Date: Monday, June 13, 2011, 11:59 AM



Hi,

I am running XEN 4.1 on Debian 6 and I cannot find blktapctrl process running. 
xend is started. I installed XEN from 4.1 source following instructions 
here:http://wiki.xensource.com/xenwiki/XenParavirtOps





http://wiki.xensource.com/xenwiki/Xen4.0

Should there be a blktapctrl process running in this version?

The problem I have encountered is that I can create a domain on a raw disk 
image but not on a QCOW disk backed by a base image. XENBUS timed out during 
the DomU boot process so I figured it was trying to communicate with blktapctrl 
process on Dom0 but couldn't find it.







Thanks,Jiangyan

------------



blktap

tapdisk

tapdisk2

blktapctrl



the above are disabled in the linux-image-2.6.32-5-xen-* Debian kernels by 
design. The reason ultimately resolves to the problems with Openssl as seen by 
the Debian developers.



If there is a reason to use all custom build, this is it.



--

Mark







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