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Sampat" Subject: Re: [PATCH v4 1/2] mm/memory_hotplug: Add support to accept memory during hot-add To: "David Hildenbrand (arm)" , linux-mm@kvack.org, linux-coco@lists.linux.dev, x86@kernel.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, kas@kernel.org, ardb@kernel.org, akpm@linux-foundation.org, osalvador@suse.de, thomas.lendacky@amd.com, michael.roth@amd.com References: <20260203174946.1198053-1-prsampat@amd.com> <20260203174946.1198053-2-prsampat@amd.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SA9PR03CA0019.namprd03.prod.outlook.com (2603:10b6:806:20::24) To CH3PR12MB8660.namprd12.prod.outlook.com (2603:10b6:610:177::5) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB8660:EE_|SJ2PR12MB8977:EE_ X-MS-Office365-Filtering-Correlation-Id: 3faff77c-a8d0-4733-01b6-08de6469a9bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016; 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>>   +    accept_hotplug_memory(start, size); >> + >>       /* device_online() will take the lock when calling online_pages() */ >>       mem_hotplug_done(); >>   > > I really hate that accepting (and un-accepting) hotplugged memory is different to accepting ordinary boot memory. > > Is there really no way we can get a reasonable implementation where we just call a generic accept_memory() and it will know what to do? > Sure, that shouldn't be impossible. The only reason I initially kept them separate is because we accept and update the bitmap unconditionally. This mainly applies to cold-plugged memory since their bitmap state after remove shouldn't matter. However, as we are now correctly setting the bits in the hot-remove path we should be fine accepting from the for_each_set_bitrange_from() logic within accept_memory(), I think. Something like so? diff --git a/drivers/firmware/efi/unaccepted_memory.c b/drivers/firmware/efi/unaccepted_memory.c index d11e7836200a..e56adfd382f8 100644 --- a/drivers/firmware/efi/unaccepted_memory.c +++ b/drivers/firmware/efi/unaccepted_memory.c @@ -36,6 +36,7 @@ void accept_memory(phys_addr_t start, unsigned long size) unsigned long range_start, range_end; struct accept_range range, *entry; phys_addr_t end = start + size; + phys_addr_t bitmap_end; unsigned long flags; u64 unit_size; @@ -44,6 +45,21 @@ void accept_memory(phys_addr_t start, unsigned long size) return; unit_size = unaccepted->unit_size; + bitmap_end = unaccepted->phys_base + unaccepted->size * unit_size * BITS_PER_BYTE; + + /* Memory completely beyond bitmap: hotplug memory, accept unconditionally */ + if (start >= bitmap_end) { + arch_accept_memory(start, end); + return; + } + + /* Memory partially beyond bitmap */ + if (end > bitmap_end) { + arch_accept_memory(bitmap_end, end); + end = bitmap_end; + } /* * Only care for the part of the range that is represented unaccept_hotplug_memory() truly doesn't do anything special for hotplug so I could just re-name it unaccept_memory(). Thanks!