http://marc.info/?l=xen-devel&m=135939492007293&w=1
This option is incompatible with PCI hotplug. This is a known problem.
We recommend Canonical disable this option as does upstream. From that
note:
"
Inside dom0, yes?
Looking at the balloon driver, it doesn't seem to handle dom0 (or domUs
with PCI devices passed-through) very well because it doesn't check the
memory map before attempting to hotplug additional memory so it ends up
overlapping a region that is already reserved. This is is particularly
common if you booted Xen with dom0_mem=max:MMM as the host's memory
beyond MMM is still in dom0's memory map (marked as UNUSABLE).
I suggest disabling CONFIG_XEN_BALLOON_MEMORY_HOTPLUG for now.
<snip>
David Vrabel
"
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https://bugs.launchpad.net/bugs/1304001
Title:
xen:balloon errors in 14.04 beta
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