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Sampat" To: , , , CC: , , , , , , , , , , , Subject: [PATCH v2 1/2] mm/memory_hotplug: Add support to accept memory during hot-add Date: Mon, 12 Jan 2026 14:22:59 -0600 Message-ID: <20260112202300.43546-2-prsampat@amd.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260112202300.43546-1-prsampat@amd.com> References: <20260112202300.43546-1-prsampat@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB4A:EE_|DS7PR12MB8230:EE_ X-MS-Office365-Filtering-Correlation-Id: 9b3ceb9d-9172-4ebd-d88d-08de52186c65 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700013|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?66JpWwiHsTOAXgCLyytz9jkMQG8Lwx3tltIBCghHs5/i428hdTAcbXdtZ5UV?= =?us-ascii?Q?nGeazdqvba/y7RcDT+mt9RiNrzN6RaKweXt+zG4UrW25B5EfuV/F2mGFH+bZ?= =?us-ascii?Q?wrNjk+dD4Wfl/stHYLuZrIspUy68sVR1jVsNinOPzMvUzriHEcGkjmK/+36l?= =?us-ascii?Q?HVSz1tLaFI76jO/G7TOLS65e9nCCTZ6gv9nySwhRWwSub2VVLsgSZcQCfnfW?= =?us-ascii?Q?7A/vLWBvPgEbOp+3GARfEMsdB5x889ErzO5OC+9bmZQtzi2hjc35I3p+4nSj?= =?us-ascii?Q?uRUeHrBT5f4sgiqURK+Jgcqgh4FcTIRXLzNqtk6SbHQ8b1x4Aw6EBiJL9wdr?= =?us-ascii?Q?xJpucwlxjVi4f3NE/Fya5JP+Knxi+pJR38+/IIU6ft8eNzrPc0cueA7yLKCm?= =?us-ascii?Q?Gc8rm/+mGackBgEOFvNtfJW1jVVl8SnISJV6PNEXI7BkjLxyrNGPA3O57mLO?= =?us-ascii?Q?tBwra/YLRjdJkBBaadtQikEpJ078qgXG3rqu0rjVqmv8bF90ws8A2Rt+1cKC?= =?us-ascii?Q?b8Z02XinOvQHm8oACCDxn9DDhlYdM/3uLtXapZ7D2z5CT82qIuySfYnAAPUF?= =?us-ascii?Q?nvSMzDbFWPHHlsdJJiNcKs0tG11ilLqSMVhfOG1EkgQdk+fGGFBW2oCMsUlK?= =?us-ascii?Q?oNLDUiRKBEric8sTr7J3OAD1RldH/Gtr4iIAxBGyEbYnrXbEEk9/zyvmRPDn?= =?us-ascii?Q?j+OROcbVFV+ntxIVdi7G3dbrFiqeZ8zLo+iNOo/pG3s+kCxmX+BDtyel6qrI?= =?us-ascii?Q?TyFaXc1T5Ldo0gdgeKC92OU4elLnac8Yu9Mhof/FSSSx56tZG3DwA+kHbk4u?= =?us-ascii?Q?UUHt7179rfUVzGCWy3qB9E93gJm03YS7uComP7NYaCa95t5O1Sf3EVQMJk9S?= =?us-ascii?Q?VbcQHsBJUqmsNX2OpNsNw96+BNXlP0dItbN96QTO0jqiCnwSdOg27EVnr+AF?= =?us-ascii?Q?m1Y98VtykKzJz7LKW/nb49yb76G4X7lz55caLhy2fBSTGZmelpRlUKaitYCz?= =?us-ascii?Q?IUaDCtAmUZBe1rbwwxGTXk73qZTibWH/2vPQlce3XR1dXODHiGNfuHXt2QRQ?= =?us-ascii?Q?uCY7BPQsCn2X/0rvBgDpqaGN2OX+OuIlUQCTKjSqAnxOZac0e6yUP5//r8+4?= =?us-ascii?Q?S9LNgywqGD8uzxKKeIOVfk/tgVo+rAM+vQ5W5EB5bgidkUchFOusIiz0tyFh?= =?us-ascii?Q?UIo8EPorPg/1Ju2KateFkc8roSIzU8qTXuXT45XZJN8gAARseUF+Nf5BuSe/?= =?us-ascii?Q?OuGUAvfKC87wb824TB+qmGKi9OgkyGmfcyPu3AYg2KfXYbZi/HUP5a+vhV+j?= =?us-ascii?Q?DNIBplF7DfPmoj05Czsg90UB/7LwjMjBWUq+G1no0T9GSIqcwG5BSHbzS02P?= =?us-ascii?Q?DuEAewHiMYbcq++lDQJ5tDrYxBOSQXSBN77LBs7/YEnHi/mNWdFIXO1wgNuI?= =?us-ascii?Q?Ngu315x+7Fs1Mq6qtLQwKMc5j2dKkhvPeu1Ru+ga6cj/0Uav8EtaA/WRSefH?= =?us-ascii?Q?WxLE44K+VCSdbal/UAfUpxjhOpKxdvDBw31Zzk+szdlkFTd6GXhbg6EL/fil?= =?us-ascii?Q?2QbNHyP7t0A47tjC9i0=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(376014)(36860700013)(1800799024)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jan 2026 20:23:18.4137 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b3ceb9d-9172-4ebd-d88d-08de52186c65 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB4A.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8230 Content-Type: text/plain; charset="utf-8" Confidential computing guests require memory to be accepted before use. The unaccepted memory bitmap maintained by firmware does not track hotplugged memory ranges. Call arch_accept_memory() during the hot-add path to explicitly validate and transition the newly added memory to a private state, making it usable by the guest. Signed-off-by: Pratik R. Sampat --- mm/memory_hotplug.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a63ec679d861..8cfbf0541430 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -38,6 +38,7 @@ #include =20 #include +#include =20 #include "internal.h" #include "shuffle.h" @@ -1567,6 +1568,9 @@ int add_memory_resource(int nid, struct resource *res= , mhp_t mhp_flags) if (!strcmp(res->name, "System RAM")) firmware_map_add_hotplug(start, start + size, "System RAM"); =20 + if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) + arch_accept_memory(start, start + size); + /* device_online() will take the lock when calling online_pages() */ mem_hotplug_done(); =20 --=20 2.52.0