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arm64: mm: add set_memory_valid()

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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 83863f25e4 ("arm64: Add support for
ARCH_SUPPORTS_DEBUG_PAGEALLOC")
This commit is contained in:
AKASHI Takahiro
2017-04-03 11:24:33 +09:00
parent 0d3db547e8
commit 8d8d32ab8f
2 changed files with 14 additions and 0 deletions
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1
arch/arm64/include/asm/cacheflush.h
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@@ -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

13
arch/arm64/mm/pageattr.c
View File

@@ -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)
{