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Fri, 28 Nov 2025 02:44:39 -0800 (PST) Received: from dw-tp ([49.207.234.175]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3476a7a4c12sm8416592a91.9.2025.11.28.02.44.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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-Stat-Signature: kei1fuyb6ayrk8yi6k195np3yhgpsi9d X-Rspam-User: X-Rspamd-Queue-Id: 98A0710000C X-Rspamd-Server: rspam09 X-HE-Tag: 1764326680-720620 X-HE-Meta: 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 gz5obnN8 HFJk0f/w+pStzPKWYXg0a+pUPrGqkousBYFl/9DwVanw8PBgjMNPh494kImGDfXjrwrLUKdMbfkLe4Wqyq61WpdaD6bYMC0hkdQ/3afQjzn9LVIM1zRE1m3PBg231Wb+48vo+AFNLOAKDevwrqAaS/13rlfqzvo1PoDRPFAsAfHnviJe3kNchVjQxJ1b5VLPIo/4Mdea3+umU/XYEqGYJQi2YTq0+GbaE/GNPjEgYewTxXYzxokj1+YgEpszhfZrTMTOQRz7BM0BpYUKM5XxTepj8rKROeCUAydnmFOS0VVlZiRc4GoDAME0exyottGz7alf+2GPNNA2g8GIp22ANAv84/OLPSEovzpJoXs3GzMncf9oEYdBUPtJistI6H7TIlg04D6qG49c1toWMmUp00PaVHDL3CgyrzKxfDWFLAJ51VHRaqGV/9HANhSccvi93tparVLbooXMIM8Pgzm1XeOoEMA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: "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