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Fri, 28 Aug 2026 00:24:36 +0800 (CST) Received: from mscphis00949.huawei.com (10.123.66.11) by mscpeml500004.china.huawei.com (7.188.26.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Thu, 27 Aug 2026 19:24:36 +0300 From: Nikita Panov To: , , , , , , , , , , , , CC: , , , , , Subject: [RFC PATCH 07/18] arm64: add support of memory protection for NUMA replicas Date: Fri, 28 Aug 2026 00:11:47 +0800 Message-ID: <20260827161158.3618409-8-panov.nikita@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260827161158.3618409-1-panov.nikita@huawei.com> References: <20260827161158.3618409-1-panov.nikita@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.123.66.11] X-ClientProxiedBy: mscpeml100003.china.huawei.com (10.199.174.67) To mscpeml500004.china.huawei.com (7.188.26.250) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260827_092444_933316_DBA3786C X-CRM114-Status: GOOD ( 10.79 ) 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: , Reply-To: artem.kuzin@huawei.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Acked-by: Artem Kuzin Acked-by: Alexander Grubnikov Acked-by: Ilya Hanov Acked-by: Denis Darvish Signed-off-by: Nikita Panov --- arch/arm64/mm/pageattr.c | 72 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 70 insertions(+), 2 deletions(-) diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index bbe98ac9ad8c..50a76385b184 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include @@ -102,7 +103,7 @@ bool can_set_direct_map(void) arm64_kfence_can_set_direct_map() || is_realm_world(); } -static int update_range_prot(unsigned long start, unsigned long size, +static int update_range_prot_pgd(pgd_t *pgtable, unsigned long start, unsigned long size, pgprot_t set_mask, pgprot_t clear_mask) { struct page_change_data data; @@ -123,12 +124,19 @@ static int update_range_prot(unsigned long start, unsigned long size, * must be eliminated by splitting the mapping. */ ret = walk_kernel_page_table_range_lockless(start, start + size, - &pageattr_ops, NULL, &data); + &pageattr_ops, pgtable, &data); lazy_mmu_mode_disable(); return ret; } +static int update_range_prot(unsigned long start, unsigned long size, + pgprot_t set_mask, pgprot_t clear_mask) +{ + return update_range_prot_pgd(NULL, start, size, set_mask, clear_mask); +} + + static int __change_memory_common(unsigned long start, unsigned long size, pgprot_t set_mask, pgprot_t clear_mask) { @@ -147,6 +155,22 @@ static int __change_memory_common(unsigned long start, unsigned long size, return ret; } +#ifdef CONFIG_KERNEL_REPLICATION +static int __change_memory_common_replicas(unsigned long start, unsigned long size, + pgprot_t set_mask, pgprot_t clear_mask) +{ + int nid; + int ret; + + for_each_memory_node(nid) { + ret |= update_range_prot_pgd(per_node_pgd(&init_mm, nid), start, size, set_mask, clear_mask); + } + + flush_tlb_kernel_range(start, start + size); + return ret; +} +#endif /* CONFIG_KERNEL_REPLICATION */ + static int change_memory_common(unsigned long addr, int numpages, pgprot_t set_mask, pgprot_t clear_mask) { @@ -211,6 +235,20 @@ static int change_memory_common(unsigned long addr, int numpages, return __change_memory_common(start, size, set_mask, clear_mask); } +#ifdef CONFIG_KERNEL_REPLICATION +static int numa_change_memory_common(unsigned long addr, int numpages, + pgprot_t set_mask, pgprot_t clear_mask) +{ + int ret; + + ret = change_memory_common(addr, numpages, set_mask, clear_mask); + if (ret) + return ret; + + return __change_memory_common_replicas(addr, numpages * PAGE_SIZE, set_mask, clear_mask); +} +#endif /* CONFIG_KERNEL_REPLICATION */ + int set_memory_ro(unsigned long addr, int numpages) { return change_memory_common(addr, numpages, @@ -239,6 +277,36 @@ int set_memory_x(unsigned long addr, int numpages) __pgprot(PTE_PXN)); } +#ifdef CONFIG_KERNEL_REPLICATION +int numa_set_memory_x(unsigned long addr, int numpages) +{ + return numa_change_memory_common(addr, numpages, + __pgprot(PTE_MAYBE_GP), + __pgprot(PTE_PXN)); +} + +int numa_set_memory_nx(unsigned long addr, int numpages) +{ + return numa_change_memory_common(addr, numpages, + __pgprot(PTE_PXN), + __pgprot(PTE_MAYBE_GP)); +} + +int numa_set_memory_ro(unsigned long addr, int numpages) +{ + return numa_change_memory_common(addr, numpages, + __pgprot(PTE_RDONLY), + __pgprot(PTE_WRITE)); +} + +int numa_set_memory_rw(unsigned long addr, int numpages) +{ + return numa_change_memory_common(addr, numpages, + __pgprot(PTE_WRITE), + __pgprot(PTE_RDONLY)); +} +#endif /*CONFIG_KERNEL_REPLICATION*/ + int set_memory_valid(unsigned long addr, int numpages, int enable) { if (enable) -- 2.34.1