From: Vincent Donnefort <vdonnefort@google.com>
To: catalin.marinas@arm.com, will@kernel.org, rppt@kernel.org,
akpm@linux-foundation.org, sudeep.holla@kernel.org,
jenswi@kernel.org, robh@kernel.org
Cc: mark.rutland@arm.com, sumit.garg@kernel.org, ardb@kernel.org,
thierry.reding@kernel.org, david@kernel.org,
danielmentz@google.com, linux-arm-kernel@lists.infradead.org,
linux-mm@kvack.org, op-tee@lists.trustedfirmware.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Vincent Donnefort <vdonnefort@google.com>
Subject: [PATCH v9 05/10] arm64: can_set_direct_map() if BBML3
Date: Wed, 2 Sep 2026 11:47:07 +0100 [thread overview]
Message-ID: <20260902104712.2399797-6-vdonnefort@google.com> (raw)
In-Reply-To: <20260902104712.2399797-1-vdonnefort@google.com>
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@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
next prev parent reply other threads:[~2026-09-02 10:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 10:47 [PATCH v9 00/10] arm64: Unmap FF-A lent memory from direct map Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 01/10] memblock: Introduce MEMBLOCK_LLMAP Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 02/10] of: reserved_mem: Introduce "ll-map" property Vincent Donnefort
2026-09-02 17:24 ` Rob Herring
2026-09-03 10:03 ` Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 03/10] set_memory.h: Introduce can_set_direct_map_range() Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 04/10] set_memory.h: Introduce __set_direct_map*() Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort [this message]
2026-09-02 10:47 ` [PATCH v9 06/10] arm64: Implement can_set_direct_map_range() Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 07/10] arm64: Implement __set_direct_map*() Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 08/10] arm64: Add support for MEMBLOCK_LLMAP Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 09/10] firmware: arm_ffa: Introduce ffa-lend-pool Vincent Donnefort
2026-09-02 17:38 ` Rob Herring
2026-09-03 10:10 ` Vincent Donnefort
2026-09-02 10:47 ` [PATCH v9 10/10] optee: Add support for arm,ffa-lend-pool Vincent Donnefort
2026-09-02 13:27 ` [PATCH v9 00/10] arm64: Unmap FF-A lent memory from direct map Vincent Donnefort
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