diff options
| author | Borislav Petkov <bp@suse.de> | 2013-10-31 17:25:04 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2013-11-02 11:09:24 +0000 |
| commit | c6b6f363f7b24aa448994e3a65c4d5b3116acfcc (patch) | |
| tree | d607339c3c28381166563bccfcf7098c8630902e /arch/x86/mm | |
| parent | f900a4b8ab0f462d89a9fcb6173cac1403415b16 (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.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 968398b023c0..2a1308a8c072 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, |