[Xen-users] memory hotplug problem with pygrub and pvgrub

[Quartexx <quartex73@xxxxxxxxx>]

Hi.
I'm trying memory hotplug using xm mem-set and is working fine.
But if I use pygryb or pvgrub it doesn't work

In short:

kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra = "(hd1)/boot/grub/menu.lst"
memory      = '128'
maxmem=2048

from dom0:
xm mem-set domU 256
xm list show domU with 256MB

from domU I see only original 128MB
If I reboot then I see 256MB and I can move from 256 to 128 on the fly
and then again to 256 and it works.  But I try to give more than 256
then I have to reboot again to see changes in domU.

Any hints?
I have already tried to use mem=2048M in extra but no luck.

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