Pkg xen devel - May 2019 - Bug#880554: max grant frames problem again

jftr: Yesterday I discovered this:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29d11cfd8698038b87458ba4d1329b9da81150a5

"xen/grant-table: log the lack of grants"

This is great, this is something we have discussed before, that the domU
kernel should tell something instead of just hanging. So, apparently
someone implemented that already.

Knorrie