arm64: mte: Map hotplugged memory as Normal Tagged

In a system supporting MTE, the linear map must allow reading/writing
allocation tags by setting the memory type as Normal Tagged. Currently,
this is only handled for memory present at boot. Hotplugged memory uses
Normal non-Tagged memory.

Introduce pgprot_mhp() for hotplugged memory and use it in
add_memory_resource(). The arm64 code maps pgprot_mhp() to
pgprot_tagged().

Note that ZONE_DEVICE memory should not be mapped as Tagged and
therefore setting the memory type in arch_add_memory() is not feasible.

Signed-off-by: Catalin Marinas <[email protected]>
Fixes: 0178dc761368 ("arm64: mte: Use Normal Tagged attributes for the linear map")
Reported-by: Patrick Daly <[email protected]>
Tested-by: Patrick Daly <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: <[email protected]> # 5.10.x
Cc: Will Deacon <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Cc: David Hildenbrand <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Vincenzo Frascino <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5ba51a8bdaeb..0cdbbfbc5757 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1072,7 +1072,7 @@ static int online_memory_block(struct memory_block *mem, void *arg)
  */
 int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 {
-	struct mhp_params params = { .pgprot = PAGE_KERNEL };
+	struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) };
 	u64 start, size;
 	bool new_node = false;
 	int ret;