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

David Hildenbrand
2021-09-27T15:06:09Z

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 <david@redhat.com>
---
mm/memory_hotplug.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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;
}
--
2.31.1