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X-CSE-ConnectionGUID: R6p9CgFiRwGuXmks5PNOXA== X-CSE-MsgGUID: ZTnpujVDRNqwqy7ZjTGBIg== X-IronPort-AV: E=McAfee;i="6700,10204,11365"; a="42455863" X-IronPort-AV: E=Sophos;i="6.14,229,1736841600"; d="scan'208";a="42455863" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Mar 2025 08:48:01 -0800 X-CSE-ConnectionGUID: kQrTrKPXTuGW0ZrSyK9IeQ== X-CSE-MsgGUID: R3le9pqxQ9G5toaDblgkKA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,229,1736841600"; d="scan'208";a="119358847" Received: from aschofie-mobl2.amr.corp.intel.com (HELO aschofie-mobl2.lan) ([10.125.110.159]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Mar 2025 08:48:01 -0800 Date: Fri, 7 Mar 2025 08:47:58 -0800 From: Alison Schofield To: "Zhijian Li (Fujitsu)" Cc: "Fontenot, Nathan" , David Hildenbrand , Fan Ni , "linux-cxl@vger.kernel.org" , "dan.j.williams@intel.com" , "linux-mm@kvack.org" , "gourry@gourry.net" Subject: Re: [PATCH v2 1/4] kernel/resource: Introduce managed SOFT RESERVED resources Message-ID: References: <1800b17449d1c231292c85f59b226aff39a81552.1737046620.git.nathan.fontenot@amd.com> <4e556200-c790-4e0a-b103-2a1529c81927@redhat.com> <3c7c5b87-f241-482b-9b00-98e2e53d8e9c@amd.com> <5067fda1-c2de-4a20-9025-ebdf90ebba8e@amd.com> <9b0fa1f7-4133-4111-9142-143c36c42f8d@redhat.com> <69701a1b-8cec-42e5-90dd-1b1c67c91823@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: gexhh6mgce6h5zdhabbxcoadr5wxci7m X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 781F780014 X-Rspam-User: X-HE-Tag: 1741366132-643642 X-HE-Meta: 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 7hXCUc96 Ts3vY2jVnTR6Ez3LxsErLGDmK0HZ47YKvT35KQKR8VU1ICT9vFjgexcAH/j3PDOgZjugWYMdR1+AUdODGkiw9SHT4PzzXykIQvlcVUVUltsJCLcX8lqfYAj6ImH9yjzuMbBA59xxXkPMc8H8sSru9g4zSNegB6rsCFxm+vWc0aGcMKi55MysUSjuBBmYdwos5Lg+urjq63LfRGlB+eVQ0Ypd9OvI9nTXwM4cAYkZLD0KceqWnX+cZZOACWOEKkKoJI69F82Cx7Ld1KJVjwTpK/wHGbdrpalYGX2idDWn7A0qIheY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Mar 07, 2025 at 05:56:25AM +0000, Zhijian Li (Fujitsu) wrote: > Hello Fontenot, > > I hope this email finds you well. > > Thank you very much for this patch. We've encountered the same issue in our product, > and your patch works. > > We do hope this issue will be resolved in the upstream kernel soon. > snip > > > I noticed your earlier discussions about designing a new approach to solve this problem, > which I'm pretty excited about. Do you have any idea when you might post the updated > version? We'd love to help out with reviewing and testing.. > > If you run into any roadblocks and need a hand, just let us know. we'd be delighted to help. > > As far as I know, this issue usually arises on Real CXL machines, but for ease of testing > and validation, we modified QEMU to simulate the intersection of 'Soft Reserved' and > the CXL region, which would aid in verification. Hi Zhijian, Wow - I want that! Can you share that QEMU branch? With QEMU cmdline too. Thanks :) Alison > > > Thanks > Zhijian