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Thu, 8 Jan 2026 01:09:37 +0000 Received: from DM3PR12MB9416.namprd12.prod.outlook.com ([fe80::8cdd:504c:7d2a:59c8]) by DM3PR12MB9416.namprd12.prod.outlook.com ([fe80::8cdd:504c:7d2a:59c8%7]) with mapi id 15.20.9499.002; Thu, 8 Jan 2026 01:09:37 +0000 Message-ID: <71fade9d-be8f-40d1-b580-4fac89a16cc7@nvidia.com> Date: Wed, 7 Jan 2026 17:08:43 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/11] Remove device private pages from physical address space To: Andrew Morton , Jordan Niethe Cc: linux-mm@kvack.org, balbirs@nvidia.com, matthew.brost@intel.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, david@redhat.com, ziy@nvidia.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, lyude@redhat.com, dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, rcampbell@nvidia.com, mpenttil@redhat.com, jgg@nvidia.com, willy@infradead.org, linuxppc-dev@lists.ozlabs.org, intel-xe@lists.freedesktop.org, jgg@ziepe.ca, Felix.Kuehling@amd.com References: <20260107091823.68974-1-jniethe@nvidia.com> <20260107120608.5ccd2cc7e4227d2e80028bd9@linux-foundation.org> Content-Language: en-US From: John Hubbard In-Reply-To: <20260107120608.5ccd2cc7e4227d2e80028bd9@linux-foundation.org> Content-Type: text/plain; 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We have been involved in escalations from various customers who have attempted to enable, say, KASLR and HMM at the same time. And they ran out of phys address space, forcing them into an awkward ugly choice of one or the other, often. This is a huge pain point and a barrier to HMM adoption. thanks, -- John Hubbard