Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9b0aa14e authored by AKASHI Takahiro's avatar AKASHI Takahiro Committed by Catalin Marinas
Browse files

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: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 764b51ea

arch/arm64/include/asm/cacheflush.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -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_rw(unsigned long addr, int numpages);

int set_memory_x(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_nx(unsigned long addr, int numpages);

int set_memory_valid(unsigned long addr, unsigned long size, int enable);





#endif
 
#endif

arch/arm64/mm/pageattr.c

+9 −6
Original line number Original line Diff line number Diff line
@@ -125,20 +125,23 @@ int set_memory_x(unsigned long addr, int numpages) 
}

}

EXPORT_SYMBOL_GPL(set_memory_x);

EXPORT_SYMBOL_GPL(set_memory_x);





#ifdef CONFIG_DEBUG_PAGEALLOC

int set_memory_valid(unsigned long addr, int numpages, int enable)

void __kernel_map_pages(struct page *page, int numpages, int enable)

{

{

	unsigned long addr = (unsigned long) page_address(page);



	if (enable)

	if (enable)

		__change_memory_common(addr, PAGE_SIZE * numpages,

		return __change_memory_common(addr, PAGE_SIZE * numpages,

					__pgprot(PTE_VALID),

					__pgprot(PTE_VALID),

					__pgprot(0));

					__pgprot(0));

	else

	else

		__change_memory_common(addr, PAGE_SIZE * numpages,

		return __change_memory_common(addr, PAGE_SIZE * numpages,

					__pgprot(0),

					__pgprot(0),

					__pgprot(PTE_VALID));

					__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

#ifdef CONFIG_HIBERNATION

/*

/*

 * When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function

 * When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function