linux-kernel - Re: [PATCH v1 0/2] powerpc/pseries/cmm: two smaller fixes

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Message-ID: <189ac734-b194-4b52-9752-18d8c0b71377@kernel.org>
Date: Fri, 28 Nov 2025 09:24:18 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
 linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
 Andrew Morton <akpm@...ux-foundation.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCH v1 0/2] powerpc/pseries/cmm: two smaller fixes

>>
>> 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.

-- 
Cheers

David