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authorBorislav Petkov <bp@suse.de>2013-10-31 16:25:04 (GMT)
committerMatt Fleming <matt.fleming@intel.com>2013-11-02 11:09:24 (GMT)
commitc6b6f363f7b24aa448994e3a65c4d5b3116acfcc (patch)
treed607339c3c28381166563bccfcf7098c8630902e /arch/x86/mm
parentf900a4b8ab0f462d89a9fcb6173cac1403415b16 (diff)
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: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pageattr.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 968398b..2a1308a 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -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,

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