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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8b29aa0082esm243922885a.50.2025.11.12.11.30.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Nov 2025 11:30:11 -0800 (PST) From: Gregory Price To: linux-mm@kvack.org Cc: kernel-team@meta.com, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, dave@stgolabs.net, jonathan.cameron@huawei.com, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, dan.j.williams@intel.com, longman@redhat.com, akpm@linux-foundation.org, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, osalvador@suse.de, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, kees@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, rientjes@google.com, jackmanb@google.com, cl@gentwo.org, harry.yoo@oracle.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, zhengqi.arch@bytedance.com, yosry.ahmed@linux.dev, nphamcs@gmail.com, chengming.zhou@linux.dev, fabio.m.de.francesco@linux.intel.com, rrichter@amd.com, ming.li@zohomail.com, usamaarif642@gmail.com, brauner@kernel.org, oleg@redhat.com, namcao@linutronix.de, escape@linux.alibaba.com, dongjoo.seo1@samsung.com Subject: [RFC PATCH v2 08/11] mm/memory_hotplug: add MHP_SPM_NODE flag Date: Wed, 12 Nov 2025 14:29:24 -0500 Message-ID: <20251112192936.2574429-9-gourry@gourry.net> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251112192936.2574429-1-gourry@gourry.net> References: <20251112192936.2574429-1-gourry@gourry.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: CA08E14000B X-Rspamd-Server: rspam07 X-Stat-Signature: kj66dcjoj9mbxs3syq3cgrb9z4yaej89 X-Rspam-User: X-HE-Tag: 1762975813-454018 X-HE-Meta: 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 LJwKNc8v qdfPO00v42TGpYbrS+UPHZ04HQZzBVaejApJKNiQVHlVHiOgmQDvoqfOioqlTFHsBiM+ycAVpcMpxgVSrs2Ful4tVYldNPIuyDDhqKVFARRsSEuiGFnsuG9s13HIFJ0dsGqcQ5XiCvCRuSTMVNBHgHG2ZUShwe2BCUbozMYdn/fFdtyK/cvHzgKGDazGUqSI5rM8h4M+y4h09zFTqh7M9fLhemvzXNIxZd6P+lBYNlrPt6G35u0c1v/qh+T5m/OGEo9yg9eFfx5e43Jv1CugCVF2KdDVHiDYeD+A5XsB8E9wgu/A04YhnsL6jQjrL2Wiu/Og3RTslYg4G+QFNi9frA2i+Eg2Lv8MIkSpt1pI+qzEWePNjLYFmPi4bs175CLxj7I+VhlqVHybWGOvVMqCy3lBnHU2kAf+CR6pf0v1X3dZyGlqx8CkEHDuTZaZj9VYHwvYDdW8qbHPePEA= 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: Add support for Specific Purpose Memory (SPM) NUMA nodes. A SPM node is managed by the page allocator, but can only allocated by using the __GFP_SP_NODE flag with an appropriate nodemask. Check/Set the node type (SysRAM vs SPM) at hotplug time. Disallow SPM from being added to SysRAM nodes and vice-versa. This prevents normal allocation paths (page faults, kmalloc, etc) from being directly exposed to these memories, and provides a clear integration point for buddy-allocation of SPM memory. Signed-off-by: Gregory Price --- include/linux/memory_hotplug.h | 10 ++++++++++ mm/memory_hotplug.c | 7 +++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 23f038a16231..a50c467951ba 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -74,6 +74,16 @@ typedef int __bitwise mhp_t; * helpful in low-memory situations. */ #define MHP_OFFLINE_INACCESSIBLE ((__force mhp_t)BIT(3)) +/* + * The hotplugged memory can only be added to a "Specific Purpose Memory" + * NUMA node. SPM Nodes are not generally accessible by the page allocator + * by way of userland configuration - as most nodemask interfaces + * (mempolicy, cpusets) restrict nodes to SysRAM nodes. + * + * Hotplugging SPM into a SysRAM Node results in -EINVAL. + * Hotplugging SysRAM into a SPM Node results in -EINVAL. + */ +#define MHP_SPM_NODE ((__force mhp_t)BIT(4)) /* * Extended parameters for memory hotplug: diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 0be83039c3b5..488cdd8e5f6f 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -1529,6 +1530,12 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) mem_hotplug_begin(); + /* Set the NUMA node type and bail out if the type is wrong */ + ret = mt_set_node_type(nid, (mhp_flags & MHP_SPM_NODE) ? + MT_NODE_TYPE_SPM : MT_NODE_TYPE_SYSRAM); + if (ret) + goto error_mem_hotplug_end; + if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) memblock_flags = MEMBLOCK_DRIVER_MANAGED; -- 2.51.1