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mm: userfaultfd: support UFFDIO_POISON for hugetlbfs

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The behavior here is the same as it is for anon/shmem.  This is done
separately because hugetlb pte marker handling is a bit different.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Axel Rasmussen <[email protected]>
Acked-by: Peter Xu <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Brian Geffon <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Gaosheng Cui <[email protected]>
Cc: Huang, Ying <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: James Houghton <[email protected]>
Cc: Jan Alexander Steffens (heftig) <[email protected]>
Cc: Jiaqi Yan <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Miaohe Lin <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Nadav Amit <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Suleiman Souhlal <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: T.J. Alumbaugh <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: ZhangPeng <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
This commit is contained in:
Axel Rasmussen
2023-08-18 10:12:17 -07:00
committed by Andrew Morton
parent 597425df4f
commit 8a13897fb0
2 changed files with 20 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
mm/hugetlb.c
+19
View File
@@ -6262,6 +6262,25 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
int writable;
bool folio_in_pagecache = false;
if (uffd_flags_mode_is(flags, MFILL_ATOMIC_POISON)) {
ptl = huge_pte_lock(h, dst_mm, dst_pte);
/* Don't overwrite any existing PTEs (even markers) */
if (!huge_pte_none(huge_ptep_get(dst_pte))) {
spin_unlock(ptl);
return -EEXIST;
}
_dst_pte = make_pte_marker(PTE_MARKER_POISONED);
set_huge_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
/* No need to invalidate - it was non-present before */
update_mmu_cache(dst_vma, dst_addr, dst_pte);
spin_unlock(ptl);
return 0;
}
if (is_continue) {
ret = -EFAULT;
folio = filemap_lock_folio(mapping, idx);
mm/userfaultfd.c
+1 -2
View File
@@ -377,8 +377,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb(
* by THP. Since we can not reliably insert a zero page, this
* feature is not supported.
*/
if (uffd_flags_mode_is(flags, MFILL_ATOMIC_ZEROPAGE) ||
uffd_flags_mode_is(flags, MFILL_ATOMIC_POISON)) {
if (uffd_flags_mode_is(flags, MFILL_ATOMIC_ZEROPAGE)) {
mmap_read_unlock(dst_mm);
return -EINVAL;
}