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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>
This commit is contained in:
AKASHI Takahiro 2017-04-03 11:24:33 +09:00 committed by Catalin Marinas
parent 764b51ead1
commit 9b0aa14e31
2 changed files with 10 additions and 6 deletions
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1
arch/arm64/include/asm/cacheflush.h
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@ -154,5 +154,6 @@ 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

15
arch/arm64/mm/pageattr.c
View File

@ -125,20 +125,23 @@ int set_memory_x(unsigned long addr, int numpages)
}
EXPORT_SYMBOL_GPL(set_memory_x);
#ifdef CONFIG_DEBUG_PAGEALLOC
void __kernel_map_pages(struct page *page, int numpages, int enable)
int set_memory_valid(unsigned long addr, int numpages, int enable)
{
unsigned long addr = (unsigned long) page_address(page);
if (enable)
__change_memory_common(addr, PAGE_SIZE * numpages,
return __change_memory_common(addr, PAGE_SIZE * numpages,
__pgprot(PTE_VALID),
__pgprot(0));
else
__change_memory_common(addr, PAGE_SIZE * numpages,
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)
{
set_memory_valid((unsigned long)page_address(page), numpages, enable);
}
#ifdef CONFIG_HIBERNATION
/*
* When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function