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[Xen-users] Re: blktap2 does not work

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: blktap2 does not work
From: Niccolò Belli <darkbasic4@xxxxxxxxx>
Date: Thu, 24 Jun 2010 00:36:14 +0200
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2010/6/23 eXeC001er <execooler@xxxxxxxxx>:
> blktap2 works in current xen-testing-4.x and xen-unstable, but you should be
> use tap2:tapdisk:aio:...... (I do not know why it is not displayed in the
> documentation, but the code works the way).

I saw there is no CONFIG_XEN_BLKDEV_TAP2 in the 2.6.32 xen git kernel,
only CONFIG_XEN_BLKDEV_TAP (which builds blktap.ko).

This is my latest config:

memory = 1000

vif = ['bridge=eth0']

disk =  [


#device_model = '/usr/lib/xen/bin/qemu-dm'
#kernel = "/usr/lib/xen/boot/hvmloader"

kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra = "(hd0,0)/boot/grub/grub.cfg"


If I do not load blktap module, using tap2:tapdisk:aio it complains
about missing blktap2 driver:

Error: Failed to create device.
   stdout: didn't find blktap-control in /proc/misc
Check that target "/srv/xen/webserver.img" exists and that blktap2
driver installed in dom0.

Using tap:tapdisk:aio it does not complain about the missing driver,
but the debian installer does not find any disk at all.

Using xvda,w instead of sda,w does not work too: the debian installer
does not find any disk.

I load the debian installer using HVM, but as soon as it comes to
install the bootloader (both grub and grub2) it complains about not
being able to install it. I also noticed it cannot set the partition
as bootable!

Without a bootloader I have to swtich to PV, but it freezes just
before the login prompt:

INIT: Entering runlevel: 2
Using makefile-style concurrent boot in runlevel 2.
Starting enhanced syslogd: rsyslogd.
Starting ACPI services...RTNETLINK1 answers: No such file or directory
acpid: error talking to the kernel via netlink
Starting periodic command scheduler: cron.
Running scripts in rc2.d/ took 0 seconds.


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