Re: [Xen-devel] [PATCH 2/2] x86/xen: dont add memory above max allowed allocation

[Jan Beulich]

>>> On 22.01.19 at 09:06, <jgross@xxxxxxxx> wrote:
> Don't allow memory to be added above the allowed maximum allocation
> limit set by Xen.

This reads as if the hypervisor was imposing a limit here, but looking at
xen_get_max_pages(), xen_foreach_remap_area(), and
xen_count_remap_pages() I take it that it's a restriction enforced by
the Xen subsystem in Linux. Furthermore from the cover letter I imply
that the observed issue was on a Dom0, yet xen_get_max_pages()'s
use of XENMEM_maximum_reservation wouldn't impose any limit there
at all (without use of the hypervisor option "dom0_mem=max:..."),
would it?

Jan