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Fri, 28 Nov 2025 02:44:38 -0800 (PST) From: Ritesh Harjani (IBM) To: "David Hildenbrand (Red Hat)" , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, Andrew Morton , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy Subject: Re: [PATCH v1 0/2] powerpc/pseries/cmm: two smaller fixes In-Reply-To: <189ac734-b194-4b52-9752-18d8c0b71377@kernel.org> Date: Fri, 28 Nov 2025 16:10:47 +0530 Message-ID: <87tsyemocw.ritesh.list@gmail.com> References: <20251021100606.148294-1-david@redhat.com> <557b5500-412a-4d26-8c4b-147c9a00d5fd@kernel.org> <87zf86n3vq.ritesh.list@gmail.com> <3cc7d401-c77c-4ac8-abb8-c264fbd9aaf0@kernel.org> <87y0nqmwaz.ritesh.list@gmail.com> <189ac734-b194-4b52-9752-18d8c0b71377@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list "David Hildenbrand (Red Hat)" writes: >>> >>> 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 -ritesh