[PATCH v9 05/10] arm64: can_set_direct_map() if BBML3

[Vincent Donnefort]

Systems supporting BBML3 can split blocks without risking unhandled
page-faults. It is therefore safe for them to set the direct map
unconditionally.

Signed-off-by: Vincent Donnefort <vdonnefort at google.com>

diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index bbe98ac9ad8c..58898ae53f5d 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -99,7 +99,8 @@ bool can_set_direct_map(void)
 	 * Realms need to make pages shared/protected at page granularity.
 	 */
 	return rodata_full || debug_pagealloc_enabled() ||
-		arm64_kfence_can_set_direct_map() || is_realm_world();
+		arm64_kfence_can_set_direct_map() || is_realm_world() ||
+		system_supports_bbml3();
 }
 
 static int update_range_prot(unsigned long start, unsigned long size,
-- 
2.55.0.970.g62bdec98f9-goog