[SOLVED] cannot allocate more than 1GB of ram after ram hotplug enabled

[lethargos]

I'm trying to assign 4GB of ram to a virtual machine, but after I enabled hotplug for memory and cpu, the ram that the vm sees is not 991 (actually 1GB). Before enabling the hotplug, it worked as as expected.
Any ideas what's going on?
I'm running proxmox 5.1-41 and the vm is running Ubuntu 16.04.5
qemu-guest-agent is installed. I'm using a fixed value of 4096MB without ballooning checked (it doesn't work if even I check it and even if I set a dynamic range). The VM is up to update.

NUMA is also enabled and there are 4 cores and 1 slot allocated.
qm config 486
agent: 1
balloon: 0
bootdisk: scsi0
cores: 4
description: 10.10.10.231%0A2a00%3Aff0%3A8888%3A2%3A%3A3%0A+ 2a00%3Aff0%3A8888%3A2%3A%3A4 2a00%3Aff0%3A8888%3A2%3A%3A83/64
hotplug: disk,network,memory,cpu
ide2: local:iso/ubuntu-16.04.3-server-amd64.iso,media=cdrom
memory: 4096
name: al-vm
net0: rtl8139=4E:20:2F:C8:9C:31,bridge=vmbr2
numa: 1
onboot: 1
ostype: l26
scsi0: local-lvm:vm-486-disk-1,size=50G
scsihw: virtio-scsi-pci
smbios1: uuid=27cec0b9-0895-4eba-989d-79332fc951cb
sockets: 1

Any ideas what's going on?

 

[spirit]

see
https://pve.proxmox.com/wiki/Hotplug_(qemu_disk,nic,cpu,memory)

/lib/udev/rules.d/80-hotplug-cpu-mem.rules

SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1"
SUBSYSTEM=="memory", ACTION=="add", TEST=="state", ATTR{state}=="offline", ATTR{state}="online"

 

[lethargos]

Thanks! It does work as expected.