[Pkg-xen-devel] Bug#517007: "xenblktap" module

[Paul Hink]

Another problem is that the blktapctrl daemon itself does not even
start if the "xenblktap" kernel module is not loaded. (blktapctrl is
started automatically by xend.)

So to use tap:aio with Xen from Debian lenny you need to

- create a symlink named "tapdisk" pointing to
  /usr/lib/xen-3.2-1/bin/tapdisk somewhere in root's $PATH and

- load the "xenblktap" kernel module before xend is started (e.g. using
  /etc/modules).

http://lists.alioth.debian.org/pipermail/pkg-xen-devel/2009-June/002344.html