Xen users - May 2010 - Ballooning support in HVM domains (Centos 5.3)

Hi,

I am running Xen packaged with Centos 5.3 x86_64.
xen_major              : 3
xen_minor              : 1
xen_extra              : .2-164.11.1.el5

I created a Centos 5.3 HVM domain (fully virtualized domain) with the following
configuration:

name = ''centos-x86_64''
memory = 1024
maxmem = 2048
vcpus = 1
vnc = 1
vncdisplay = 1
vncunused = 0
apic = 1
pae = 1
acpi = 1
disk = [ ''phy:/dev/vm/centos-x86_64,hda,w'']
vif = [ '''' ]
usbdevice = ''tablet''
builder = ''hvm''
kernel = ''/usr/sbin/hvmloader''
boot = ''cd''
device_model = ''/usr/sbin/qemu-dm''
on_poweroff = ''destroy''
on_reboot   = ''restart''
on_crash    = ''preserve''

The domain installed and booted successfully. I want to increase the memory in
the domain to 1512MB from 1024MB using the xm mem-set command. On issuing the
command, I do not see the memory changing dynamically in the domain. The
increase is only picked up on a reboot. When I do an lsmod in the domain, I see
that the xen_balloon driver is loaded. However, I cannot see a /proc/xen
directory. The xen_balloon driver is loaded in Dom0 and I do see the /proc/xen
directory there. Do I need to do anything extra to enable ballooning in a HVM /
fully virtualized domain?

Thanks,
Aravindh



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