Luckily it is used as argument to commands with does not allow any
harmful arguments (virsh set(max)mem). Also usage in arithmetic
expression does not allow any harmful usage in this place.
Apparently it is much faster. Especially during savefile preparation -
tar reads the whole file, while bsdtar gets file map and reads only used
regions.
Move DispVM creation to qfile-daemon-dvm/QubesDisposableVm from
qubes-restore. As actual restore is handled by libvirt, we don't get
much from separate qubes-restore process.
This code still needs some improvements, especially on performance.
Apparently it doesn't work with some kernels - saved domain still needs
original memory amount to restore successfully. This happens at least on
3.12.14 kernel.
Because qfile-daemon-dvm always requests 400MB from qmemman, this change
should harm anyone - in any case DispVM needs 400MB free memory to
start.
Note that "xl mem-set" line is still there, which makes savefile somehow
smaller (so faster restore).
Now gui-agent supports reconnect to guid, so start it early to have Xorg
running in the VM.
This is still not done - for example it tries to run some commands via
(not running yet) qrexec.
