xen: enable BALLOON_MEMORY_HOTPLUG by default
Without it a PVH dom0 is mostly useless, as it would balloon down huge amounts of RAM in order get physical address space to map foreign memory and grants, ultimately leading to an out of memory situation. Such option is also needed for HVM or PVH driver domains, since they also require mapping grants into physical memory regions. Suggested-by: Ian Jackson <ian.jackson@eu.citrix.com> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Link: https://lore.kernel.org/r/20200324150015.50496-2-roger.pau@citrix.comReviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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