[Bug 1297224] Re: Improve xen packages and hvm domUs support

[Stefan Bader]

Supporting flexible locations of qemu and alternate location for the
ovmf BIOS would allow to get rid of patches. So sounds useful. Note that
the 14.04 (Trusty) release of Ubuntu (as well as the 13.10 (Saucy)
release) were not using the Xen version of qemu for xl but the generic
upstream qemu (compiled with Xen support).

To push deprecation of xend in 14.04, xl was made the default toolstack.
In order to not completely break users of xend it still ships with xend
support and this will not get removed in the 14.04 release. This could
be something to try in the next release. If Xen-4.5 is ready by then its
gone anyway and in case we stick with 4.4 we could stop using --with-
xend. Probably depending on upstream to decide whether the old device-
model should go, too.

Blktap(2) is not installed by default. It has been a bunch of separate
packages for a while. The default is to use upmstream qemu. Not sure
whether qdisk refers to a specific interface. Normally IDE is specified
and blkfront is used after unplug.

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https://bugs.launchpad.net/bugs/1297224

Title:
  Improve xen packages and hvm domUs support

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