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

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

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov 2013-10-31 17:25:04 +01:00 committed by Matt Fleming
parent f900a4b8ab
commit c6b6f363f7
1 changed files with 21 additions and 1 deletions
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22
arch/x86/mm/pageattr.c
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@ -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,