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[81.185.174.238]) by smtp.gmail.com with ESMTPSA id h5-20020a5d5485000000b002c5a1bd5280sm7210070wrv.95.2023.03.16.06.19.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Mar 2023 06:19:20 -0700 (PDT) From: Alexandre Ghiti To: Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , Rob Herring , Frank Rowand , Mike Rapoport , Andrew Morton , Anup Patel , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-mm@kvack.org Cc: Alexandre Ghiti Subject: [PATCH v8 2/4] mm: Introduce memblock_isolate_memory Date: Thu, 16 Mar 2023 14:17:09 +0100 Message-Id: <20230316131711.1284451-3-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230316131711.1284451-1-alexghiti@rivosinc.com> References: <20230316131711.1284451-1-alexghiti@rivosinc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230316_061922_520717_178C47F2 X-CRM114-Status: GOOD ( 12.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This function allows to split a region in memblock.memory and will be useful when setting up the linear mapping with STRICT_KERNEL_RWX: it allows to isolate the kernel text/rodata and then avoid to map those regions with a PUD/P4D/PGD. Signed-off-by: Alexandre Ghiti Reviewed-by: Anup Patel Tested-by: Anup Patel Acked-by: Mike Rapoport (IBM) --- include/linux/memblock.h | 1 + mm/memblock.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 50ad19662a32..2f7ef97c0da7 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -125,6 +125,7 @@ int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); +int memblock_isolate_memory(phys_addr_t base, phys_addr_t size); void memblock_free_all(void); void memblock_free(void *ptr, size_t size); diff --git a/mm/memblock.c b/mm/memblock.c index 25fd0626a9e7..e8c651a37012 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -805,6 +805,26 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type, return 0; } +/** + * memblock_isolate_memory - isolate given range in memblock.memory + * @base: base of range to isolate + * @size: size of range to isolate + * + * Isolates the given range in memblock.memory so that it does not share any + * region with other ranges. + * + * Return: + * 0 on success, -errno on failure. + */ + +int __init_memblock memblock_isolate_memory(phys_addr_t base, phys_addr_t size) +{ + int start_rgn, end_rgn; + + return memblock_isolate_range(&memblock.memory, base, size, + &start_rgn, &end_rgn); +} + static int __init_memblock memblock_remove_range(struct memblock_type *type, phys_addr_t base, phys_addr_t size) {