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x86/mm/pageattr: Add last levels of error path
We try to free the pagetable pages once we've unmapped our portion. Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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@ -666,7 +666,99 @@ 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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#define unmap_pmd_range(pud, start, pre_end) do {} while (0)
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static bool try_to_free_pte_page(pte_t *pte)
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{
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int i;
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for (i = 0; i < PTRS_PER_PTE; i++)
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if (!pte_none(pte[i]))
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return false;
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free_page((unsigned long)pte);
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return true;
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}
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static bool try_to_free_pmd_page(pmd_t *pmd)
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{
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int i;
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for (i = 0; i < PTRS_PER_PMD; i++)
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if (!pmd_none(pmd[i]))
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return false;
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free_page((unsigned long)pmd);
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return true;
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}
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static bool unmap_pte_range(pmd_t *pmd, unsigned long start, unsigned long end)
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{
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pte_t *pte = pte_offset_kernel(pmd, start);
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while (start < end) {
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set_pte(pte, __pte(0));
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start += PAGE_SIZE;
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pte++;
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}
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if (try_to_free_pte_page((pte_t *)pmd_page_vaddr(*pmd))) {
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pmd_clear(pmd);
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return true;
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}
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return false;
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}
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static void __unmap_pmd_range(pud_t *pud, pmd_t *pmd,
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unsigned long start, unsigned long end)
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{
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if (unmap_pte_range(pmd, start, end))
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if (try_to_free_pmd_page((pmd_t *)pud_page_vaddr(*pud)))
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pud_clear(pud);
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}
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static void unmap_pmd_range(pud_t *pud, unsigned long start, unsigned long end)
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{
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pmd_t *pmd = pmd_offset(pud, start);
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/*
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* Not on a 2MB page boundary?
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*/
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if (start & (PMD_SIZE - 1)) {
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unsigned long next_page = (start + PMD_SIZE) & PMD_MASK;
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unsigned long pre_end = min_t(unsigned long, end, next_page);
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__unmap_pmd_range(pud, pmd, start, pre_end);
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start = pre_end;
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pmd++;
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}
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/*
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* Try to unmap in 2M chunks.
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*/
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while (end - start >= PMD_SIZE) {
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if (pmd_large(*pmd))
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pmd_clear(pmd);
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else
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__unmap_pmd_range(pud, pmd, start, start + PMD_SIZE);
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start += PMD_SIZE;
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pmd++;
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}
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/*
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* 4K leftovers?
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*/
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if (start < end)
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return __unmap_pmd_range(pud, pmd, start, end);
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/*
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* Try again to free the PMD page if haven't succeeded above.
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*/
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if (!pud_none(*pud))
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if (try_to_free_pmd_page((pmd_t *)pud_page_vaddr(*pud)))
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pud_clear(pud);
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}
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static void unmap_pud_range(pgd_t *pgd, unsigned long start, unsigned long end)
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{
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