diff options
| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2017-04-03 11:24:33 +0900 |
|---|---|---|
| committer | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2017-06-19 15:09:03 +0900 |
| commit | 8d8d32ab8f8bc41cdf00c2c44c50041cb93a3dc4 (patch) | |
| tree | d16e1b6060b89b3efbe338442d27fd6336aa91c3 /arch | |
| parent | 0d3db547e8c547d38dc0035d0cf1c49dc7cbf735 (diff) | |
arm64: mm: add set_memory_valid()
This function validates and invalidates PTE entries, and will be utilized
in kdump to protect loaded crash dump kernel image.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Conflicts:
arch/arm64/mm/pageattr.c
due to missing commit 83863f25e4b8 ("arm64: Add support for
ARCH_SUPPORTS_DEBUG_PAGEALLOC")
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/cacheflush.h | 1 | ||||
| -rw-r--r-- | arch/arm64/mm/pageattr.c | 13 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index 22dda613f9c9..22aabdeacc24 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -155,5 +155,6 @@ int set_memory_ro(unsigned long addr, int numpages); int set_memory_rw(unsigned long addr, int numpages); int set_memory_x(unsigned long addr, int numpages); int set_memory_nx(unsigned long addr, int numpages); +int set_memory_valid(unsigned long addr, unsigned long size, int enable); #endif diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index ca6d268e3313..f4e39dbdd36b 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -125,6 +125,19 @@ int set_memory_x(unsigned long addr, int numpages) } EXPORT_SYMBOL_GPL(set_memory_x); + +int set_memory_valid(unsigned long addr, int numpages, int enable) +{ + if (enable) + return __change_memory_common(addr, PAGE_SIZE * numpages, + __pgprot(PTE_VALID), + __pgprot(0)); + else + return __change_memory_common(addr, PAGE_SIZE * numpages, + __pgprot(0), + __pgprot(PTE_VALID)); +} + #ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { |