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[Xen-users] VM won't boot: can't allocate low memory for domain: Out of memory

  Hi All,
  I updated my Xen host to Debian buster, and my guests refuse to boot.

  OS and Xen versions are:
# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster

  Xen 4.11.4-pre

  The error reported at guest VM creation is as follows: 

xc: error: panic: xc_dom_boot.c:122: xc_dom_boot_mem_init: can't allocate low memory for domain: Out of memory

libxl: error: libxl_dom.c:737:libxl__build_dom: xc_dom_boot_mem_init failed: Cannot allocate memory
 libxl: error: libxl_create.c:1267:domcreate_rebuild_done: Domain 2:cannot (re-)build domain: -3

   I did my share of googling and found nothing significant, at least not besides the following configurations I did for earlier Xen versions:
  1) This entry in grub.cfg:
multiboot /boot/xen-4.11-amd64.gz placeholder  dom0_mem=1024M,max:1024M ${xen_rm_opts}

  2) This entry in /etc/default/grub.d/xen.cfg

  Any suggestions? Checks? I'm out of ideas.
  Thank you for your attention,


Ezio Ostorero, Catania
Seltz e limone col sale. Arriminatu, non annacatu
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