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x86/mm/pageattr: Add a PMD pagetable populating function
Handle PMD-level mappings the same as PUD ones. Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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@ -666,6 +666,16 @@ static int split_large_page(pte_t *kpte, unsigned long address)
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return 0;
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}
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static int alloc_pte_page(pmd_t *pmd)
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{
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pte_t *pte = (pte_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
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if (!pte)
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return -1;
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set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE));
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return 0;
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}
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static int alloc_pmd_page(pud_t *pud)
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{
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pmd_t *pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
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@ -676,7 +686,77 @@ static int alloc_pmd_page(pud_t *pud)
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return 0;
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}
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#define populate_pmd(cpa, start, end, pages, pud, pgprot) (-1)
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#define populate_pte(cpa, start, end, pages, pmd, pgprot) do {} while (0)
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static int populate_pmd(struct cpa_data *cpa,
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unsigned long start, unsigned long end,
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unsigned num_pages, pud_t *pud, pgprot_t pgprot)
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{
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unsigned int cur_pages = 0;
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pmd_t *pmd;
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/*
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* Not on a 2M boundary?
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*/
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if (start & (PMD_SIZE - 1)) {
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unsigned long pre_end = start + (num_pages << PAGE_SHIFT);
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unsigned long next_page = (start + PMD_SIZE) & PMD_MASK;
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pre_end = min_t(unsigned long, pre_end, next_page);
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cur_pages = (pre_end - start) >> PAGE_SHIFT;
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cur_pages = min_t(unsigned int, num_pages, cur_pages);
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/*
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* Need a PTE page?
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*/
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pmd = pmd_offset(pud, start);
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if (pmd_none(*pmd))
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if (alloc_pte_page(pmd))
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return -1;
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populate_pte(cpa, start, pre_end, cur_pages, pmd, pgprot);
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start = pre_end;
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}
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/*
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* We mapped them all?
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*/
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if (num_pages == cur_pages)
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return cur_pages;
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while (end - start >= PMD_SIZE) {
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/*
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* We cannot use a 1G page so allocate a PMD page if needed.
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*/
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if (pud_none(*pud))
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if (alloc_pmd_page(pud))
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return -1;
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pmd = pmd_offset(pud, start);
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set_pmd(pmd, __pmd(cpa->pfn | _PAGE_PSE | massage_pgprot(pgprot)));
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start += PMD_SIZE;
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cpa->pfn += PMD_SIZE;
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cur_pages += PMD_SIZE >> PAGE_SHIFT;
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}
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/*
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* Map trailing 4K pages.
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*/
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if (start < end) {
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pmd = pmd_offset(pud, start);
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if (pmd_none(*pmd))
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if (alloc_pte_page(pmd))
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return -1;
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populate_pte(cpa, start, end, num_pages - cur_pages,
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pmd, pgprot);
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}
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return num_pages;
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}
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static int populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *pgd,
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pgprot_t pgprot)
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