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Commit c6b6f363 authored by Borislav Petkov's avatar Borislav Petkov Committed by Matt Fleming
Browse files

x86/mm/pageattr: Add a PTE pagetable populating function 



Handle last level by unconditionally writing the PTEs into the PTE page
while paying attention to the NX bit.

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent f900a4b8

arch/x86/mm/pageattr.c

+21 −1
Original line number Diff line number Diff line
@@ -686,7 +686,27 @@ static int alloc_pmd_page(pud_t *pud) 
	return 0;

}



#define populate_pte(cpa, start, end, pages, pmd, pgprot)	do {} while (0)

static void populate_pte(struct cpa_data *cpa,

			 unsigned long start, unsigned long end,

			 unsigned num_pages, pmd_t *pmd, pgprot_t pgprot)

{

	pte_t *pte;



	pte = pte_offset_kernel(pmd, start);



	while (num_pages-- && start < end) {



		/* deal with the NX bit */

		if (!(pgprot_val(pgprot) & _PAGE_NX))

			cpa->pfn &= ~_PAGE_NX;



		set_pte(pte, pfn_pte(cpa->pfn >> PAGE_SHIFT, pgprot));



		start	 += PAGE_SIZE;

		cpa->pfn += PAGE_SIZE;

		pte++;

	}

}



static int populate_pmd(struct cpa_data *cpa,

			unsigned long start, unsigned long end,