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Encode huge page size for VM_FAULT_HWPOISON errors
This fixes a problem introduced with the hugetlb hwpoison handling The user space SIGBUS signalling wants to know the size of the hugepage that caused a HWPOISON fault. Unfortunately the architecture page fault handlers do not have easy access to the struct page. Pass the information out in the fault error code instead. I added a separate VM_FAULT_HWPOISON_LARGE bit for this case and encode the hpage index in some free upper bits of the fault code. The small page hwpoison keeps stays with the VM_FAULT_HWPOISON name to minimize changes. Also add code to hugetlb.h to convert that index into a page shift. Will be used in a further patch. Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: fengguang.wu@intel.com Signed-off-by: Andi Kleen <ak@linux.intel.com>
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4 changed files with 22 additions and 5 deletions
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@ -2589,7 +2589,8 @@ retry:
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* So we need to block hugepage fault by PG_hwpoison bit check.
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*/
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if (unlikely(PageHWPoison(page))) {
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ret = VM_FAULT_HWPOISON;
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ret = VM_FAULT_HWPOISON |
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VM_FAULT_SET_HINDEX(h - hstates);
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goto backout_unlocked;
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}
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page_dup_rmap(page);
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@ -2656,7 +2657,8 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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migration_entry_wait(mm, (pmd_t *)ptep, address);
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return 0;
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} else if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
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return VM_FAULT_HWPOISON;
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return VM_FAULT_HWPOISON_LARGE |
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VM_FAULT_SET_HINDEX(h - hstates);
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}
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ptep = huge_pte_alloc(mm, address, huge_page_size(h));
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