[v1,4/4] mm/memory_hotplug: indicate MEMBLOCK_DRIVER_MANAGED with IORESOURCE_SYSRAM_DRIVER_MANAGED

Commit Message

David Hildenbrand Sept. 27, 2021, 3:05 p.m. UTC

Let's communicate driver-managed regions to memblock, to properly
teach kexec_file with CONFIG_ARCH_KEEP_MEMBLOCK to not place images on
these memory regions.

Signed-off-by: David Hildenbrand <[e-mail]>
---
 mm/memory_hotplug.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5f873e7f5b29..6d90818d4ce8 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1357,6 +1357,7 @@  bool mhp_supports_memmap_on_memory(unsigned long size)
 int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 {
 	struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) };
+	enum memblock_flags memblock_flags = MEMBLOCK_NONE;
 	struct vmem_altmap mhp_altmap = {};
 	struct memory_group *group = NULL;
 	u64 start, size;
@@ -1385,7 +1386,9 @@  int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 	mem_hotplug_begin();
 
 	if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) {
-		ret = memblock_add_node(start, size, nid, MEMBLOCK_NONE);
+		if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED)
+			memblock_flags = MEMBLOCK_DRIVER_MANAGED;
+		ret = memblock_add_node(start, size, nid, memblock_flags);
 		if (ret)
 			goto error_mem_hotplug_end;
 	}