On 11/28/25 11:40, Ritesh Harjani (IBM) wrote:

"David Hildenbrand (Red Hat)" [off-list ref] writes:

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Right. Let me give it a try first with pseries Qemu. Otherwise I have an
access to pseries LPAR too. I can verify it there.

Ah, now I realize my problem: I tried with Fedora 43 in a powerpc VM but
the modprobe didn't do anything.

Looking again:

# grep CONFIG_CMM /boot/config-6.17.1-300.fc43.ppc64le
CONFIG_CMM=y

So modprob'ing won't do as the module is built in.

Right, so doing "cmm.simulate=1" on the cmdline in a Fedora 43 VMs
properly creates the CMM device.

Right verifying using simulate mode is very straightforward. Thanks for that!
So.. using various random echo X > simulate_loan_target_kb on a VM...

~# cat /proc/vmstat |grep balloon
nr_balloon_pages 16
balloon_inflate 1638
balloon_deflate 1622
balloon_migrate 4

Thanks a bunch for the review and testing!

-- 
Cheers

David