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authorArd Biesheuvel <ard.biesheuvel@arm.com>2019-05-23 11:22:54 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2019-06-24 18:10:39 +0100
commit4739d53fcd1df8a9f6f72bb02a3a1d852ad252b3 (patch)
treee5f824c41f3e1de19dc0f4df5401bad920abf0ba /arch
parent7dfac3c5f40eb92841147eccf1b96f428b10131f (diff)
arm64/mm: wire up CONFIG_ARCH_HAS_SET_DIRECT_MAP
Wire up the special helper functions to manipulate aliases of vmalloc regions in the linear map. Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/Kconfig1
-rw-r--r--arch/arm64/include/asm/cacheflush.h3
-rw-r--r--arch/arm64/mm/pageattr.c48
3 files changed, 44 insertions, 8 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 22f8e6b3b0f9..61b4a2d35508 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -26,6 +26,7 @@ config ARM64
select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SETUP_DMA_OPS
+ select ARCH_HAS_SET_DIRECT_MAP
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_STRICT_MODULE_RWX
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 19844211a4e6..b9ee5510067f 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -187,4 +187,7 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
int set_memory_valid(unsigned long addr, int numpages, int enable);
+int set_direct_map_invalid_noflush(struct page *page);
+int set_direct_map_default_noflush(struct page *page);
+
#endif
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index 6cd645edcf35..9c6b9039ec8f 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -159,17 +159,48 @@ int set_memory_valid(unsigned long addr, int numpages, int enable)
__pgprot(PTE_VALID));
}
-#ifdef CONFIG_DEBUG_PAGEALLOC
+int set_direct_map_invalid_noflush(struct page *page)
+{
+ struct page_change_data data = {
+ .set_mask = __pgprot(0),
+ .clear_mask = __pgprot(PTE_VALID),
+ };
+
+ if (!rodata_full)
+ return 0;
+
+ return apply_to_page_range(&init_mm,
+ (unsigned long)page_address(page),
+ PAGE_SIZE, change_page_range, &data);
+}
+
+int set_direct_map_default_noflush(struct page *page)
+{
+ struct page_change_data data = {
+ .set_mask = __pgprot(PTE_VALID | PTE_WRITE),
+ .clear_mask = __pgprot(PTE_RDONLY),
+ };
+
+ if (!rodata_full)
+ return 0;
+
+ return apply_to_page_range(&init_mm,
+ (unsigned long)page_address(page),
+ PAGE_SIZE, change_page_range, &data);
+}
+
void __kernel_map_pages(struct page *page, int numpages, int enable)
{
+ if (!debug_pagealloc_enabled() && !rodata_full)
+ return;
+
set_memory_valid((unsigned long)page_address(page), numpages, enable);
}
-#ifdef CONFIG_HIBERNATION
+
/*
- * When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function
- * is used to determine if a linear map page has been marked as not-valid by
- * CONFIG_DEBUG_PAGEALLOC. Walk the page table and check the PTE_VALID bit.
- * This is based on kern_addr_valid(), which almost does what we need.
+ * This function is used to determine if a linear map page has been marked as
+ * not-valid. Walk the page table and check the PTE_VALID bit. This is based
+ * on kern_addr_valid(), which almost does what we need.
*
* Because this is only called on the kernel linear map, p?d_sect() implies
* p?d_present(). When debug_pagealloc is enabled, sections mappings are
@@ -183,6 +214,9 @@ bool kernel_page_present(struct page *page)
pte_t *ptep;
unsigned long addr = (unsigned long)page_address(page);
+ if (!debug_pagealloc_enabled() && !rodata_full)
+ return true;
+
pgdp = pgd_offset_k(addr);
if (pgd_none(READ_ONCE(*pgdp)))
return false;
@@ -204,5 +238,3 @@ bool kernel_page_present(struct page *page)
ptep = pte_offset_kernel(pmdp, addr);
return pte_valid(READ_ONCE(*ptep));
}
-#endif /* CONFIG_HIBERNATION */
-#endif /* CONFIG_DEBUG_PAGEALLOC */