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| author | Nadav Amit <namit@vmware.com> | 2022-03-07 18:48:51 +0000 |
|---|---|---|
| committer | Alejandro Colomar <alx@kernel.org> | 2023-04-08 15:30:54 +0200 |
| commit | 994a585e332aee6fc5553e092a92f4daf9d481fe (patch) | |
| tree | 4ba89ab355246e38f1e633e29dd902aa34c2a7c4 | |
| parent | 4dd64901fcaf3679f5e51ac6ede38d38f7b578ba (diff) | |
ioctl_userfaultfd.2: Add UFFD_FEATURE_EXACT_ADDRESS
Describe the new UFFD_FEATURE_EXACT_ADDRESS API feature.
Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
| -rw-r--r-- | man2/ioctl_userfaultfd.2 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2 index 06e754cea..3f851f51b 100644 --- a/man2/ioctl_userfaultfd.2 +++ b/man2/ioctl_userfaultfd.2 @@ -207,6 +207,14 @@ in minor mode on hugetlbfs-backed memory areas. If this feature bit is set, the kernel supports registering userfaultfd ranges in minor mode on shmem-backed memory areas. +.TP +.BR UFFD_FEATURE_EXACT_ADDRESS " (since Linux 5.18)" +If this feature bit is set, +.I uffd_msg.pagefault.address +will be set to the exact page-fault address that was reported by the hardware, +and will not mask the offset within the page. +Note that old Linux versions might indicate the exact address as well, +even though the feature bit is not set. .PP The returned .I ioctls |