Axel Rasmussen 0289184476 mm: userfaultfd: add UFFDIO_CONTINUE_MODE_WP to install WP PTEs ... UFFDIO_COPY already has UFFDIO_COPY_MODE_WP, so when installing a new PTE to resolve a missing fault, one can install a write-protected one. This is useful when using UFFDIO_REGISTER_MODE_{MISSING,WP} in combination. This was motivated by testing HugeTLB HGM [1], and in particular its interaction with userfaultfd features. Existing userfaultfd code supports using WP and MINOR modes together (i.e. you can register an area with both enabled), but without this CONTINUE flag the combination is in practice unusable. So, add an analogous UFFDIO_CONTINUE_MODE_WP, which does the same thing as UFFDIO_COPY_MODE_WP, but for *minor* faults. Update the selftest to do some very basic exercising of the new flag. Update Documentation/ to describe how these flags are used (neither the COPY nor the new CONTINUE versions of this mode flag were described there before). [1]: https://patchwork.kernel.org/project/linux-mm/cover/20230218002819.1486479-1-jthoughton@google.com/ Link: https://lkml.kernel.org/r/20230314221250.682452-5-axelrasmussen@google.com Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> Acked-by: Peter Xu <peterx@redhat.com> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Hugh Dickins <hughd@google.com> Cc: Jan Kara <jack@suse.cz> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Nadav Amit <namit@vmware.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2023-04-05 19:42:48 -07:00
..
damon	mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_mark_accessed_or_deactivate()	2023-03-07 17:04:55 -08:00
kasan	kasan: suppress recursive reports for HW_TAGS	2023-04-05 19:42:43 -07:00
kfence	mm: kfence: fix handling discontiguous page	2023-03-28 15:24:32 -07:00
kmsan	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
backing-dev.c	mm: add /sys/class/bdi/<bdi>/min_ratio_fine knob	2022-11-30 15:59:06 -08:00
balloon_compaction.c	mm: Convert all PageMovable users to movable_operations	2022-08-02 12:34:03 -04:00
bootmem_info.c	bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem	2022-08-28 14:02:45 -07:00
cma.c	mm/cma: fix potential memory loss on cma_declare_contiguous_nid	2023-02-02 22:33:24 -08:00
cma.h
cma_debug.c	mm/cma_debug: show complete cma name in debugfs directories	2022-09-11 20:25:50 -07:00
cma_sysfs.c	mm: cma: make kobj_type structure constant	2023-03-28 16:20:06 -07:00
compaction.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
debug.c	mm/debug: use %pGt to display page_type in dump_page()	2023-03-28 16:20:09 -07:00
debug_page_ref.c
debug_vm_pgtable.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
dmapool.c	dmapool: create/destroy cleanup	2023-04-05 19:42:41 -07:00
dmapool_test.c	dmapool: add alloc/free performance test	2023-04-05 19:42:38 -07:00
early_ioremap.c
fadvise.c	mm: support POSIX_FADV_NOREUSE	2023-01-18 17:12:57 -08:00
failslab.c	mm: fix unexpected changes to {failslab|fail_page_alloc}.attr	2022-11-22 18:50:44 -08:00
filemap.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
folio-compat.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
frontswap.c	frontswap: don't call ->init if no ops are registered	2022-09-26 12:14:34 -07:00
gup.c	mm/gup.c: fix typo in comments	2023-03-28 16:20:14 -07:00
gup_test.c	mm/gup_test: free memory allocated via kvcalloc() using kvfree()	2022-12-15 16:37:48 -08:00
gup_test.h	mm/gup_test: start/stop/read functionality for PIN LONGTERM test	2022-11-08 17:37:15 -08:00
highmem.c	highmem: fix kmap_to_page() for kmap_local_page() addresses	2022-10-12 18:51:51 -07:00
hmm.c	mm/hugetlb: make walk_hugetlb_range() safe to pmd unshare	2023-01-18 17:12:39 -08:00
huge_memory.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
hugetlb.c	mm: userfaultfd: combine 'mode' and 'wp_copy' arguments	2023-04-05 19:42:48 -07:00
hugetlb_cgroup.c	mm/hugetlb: increase use of folios in alloc_huge_page()	2023-02-13 15:54:27 -08:00
hugetlb_vmemmap.c	mm: prefer xxx_page() alloc/free functions for order-0 pages	2023-03-28 16:20:16 -07:00
hugetlb_vmemmap.h	mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability	2022-08-08 18:06:43 -07:00
hwpoison-inject.c	mm/hwpoison: add __init/__exit annotations to module init/exit funcs	2022-10-03 14:03:05 -07:00
init-mm.c	mm: remove rb tree.	2022-09-26 19:46:16 -07:00
internal.h	mm, printk: introduce new format %pGt for page_type	2023-03-28 16:20:09 -07:00
interval_tree.c
io-mapping.c
ioremap.c	mm: ioremap: Add ioremap/iounmap_allowed()	2022-06-27 12:22:31 +01:00
Kconfig	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
Kconfig.debug	mm: move KMEMLEAK's Kconfig items from lib to mm	2023-02-02 22:33:26 -08:00
khugepaged.c	mm/uffd: UFFD_FEATURE_WP_UNPOPULATED	2023-04-05 19:42:44 -07:00
kmemleak.c	lib/stackdepot, mm: rename stack_depot_want_early_init	2023-02-16 20:43:49 -08:00
ksm.c	mm: add tracepoints to ksm	2023-03-28 16:20:08 -07:00
list_lru.c
maccess.c	maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault()	2022-11-11 11:44:46 -08:00
madvise.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
Makefile	dmapool: add alloc/free performance test	2023-04-05 19:42:38 -07:00
mapping_dirty_helpers.c	mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export	2023-02-02 22:32:54 -08:00
memblock.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
memcontrol.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
memfd.c	mm/memfd: add write seals when apply SEAL_EXEC to executable memfd	2023-01-18 17:12:37 -08:00
memory-failure.c	mm: memory-failure: directly use IS_ENABLED(CONFIG_HWPOISON_INJECT)	2023-03-28 16:20:17 -07:00
memory-tiers.c	memory tier: release the new_memtier in find_create_memory_tier()	2023-02-09 16:51:40 -08:00
memory.c	mm/uffd: UFFD_FEATURE_WP_UNPOPULATED	2023-04-05 19:42:44 -07:00
memory_hotplug.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
mempolicy.c	mm: hugetlb: change to return bool for isolate_hugetlb()	2023-02-20 12:46:17 -08:00
mempool.c	mempool: do not use ksize() for poisoning	2022-11-30 15:58:41 -08:00
memremap.c	mm/memremap.c: fix outdated comment in devm_memremap_pages	2023-02-09 16:51:46 -08:00
memtest.c
migrate.c	mm/migrate: drop pte_mkhuge() in remove_migration_pte()	2023-03-28 16:20:11 -07:00
migrate_device.c	mm: change to return bool for isolate_lru_page()	2023-02-20 12:46:17 -08:00
mincore.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
mlock.c	mm: introduce vm_flags_reset_once to replace WRITE_ONCE vm_flags updates	2023-02-09 16:51:41 -08:00
mm_init.c	memory: move hotplug memory notifier priority to same file for easy sorting	2022-11-08 17:37:17 -08:00
mm_slot.h	mm: introduce common struct mm_slot	2022-10-03 14:02:43 -07:00
mmap.c	mm: deduplicate error handling for map_deny_write_exec	2023-03-23 17:18:32 -07:00
mmap_lock.c
mmu_gather.c	mm: prefer xxx_page() alloc/free functions for order-0 pages	2023-03-28 16:20:16 -07:00
mmu_notifier.c	mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export	2023-02-02 22:32:54 -08:00
mmzone.c	mm: multi-gen LRU: groundwork	2022-09-26 19:46:09 -07:00
mprotect.c	mm/uffd: UFFD_FEATURE_WP_UNPOPULATED	2023-04-05 19:42:44 -07:00
mremap.c	x86/mm/pat: clear VM_PAT if copy_p4d_range failed	2023-03-28 16:20:07 -07:00
msync.c	mm/msync: use vma_find() instead of vma linked list	2022-09-26 19:46:25 -07:00
nommu.c	mm: replace vma->vm_flags direct modifications with modifier calls	2023-02-09 16:51:39 -08:00
oom_kill.c	mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export	2023-02-02 22:32:54 -08:00
page-writeback.c	mm,jfs: move write_one_page/folio_write_one to jfs	2023-03-28 16:20:14 -07:00
page_alloc.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
page_counter.c	mm: page_counter: remove unneeded atomic ops for low/min	2022-09-11 20:26:01 -07:00
page_ext.c	mm/page_ext: init page_ext early if there are no deferred struct pages	2023-02-02 22:33:22 -08:00
page_idle.c	mm: page_idle: convert page idle to use a folio	2023-01-18 17:12:52 -08:00
page_io.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
page_isolation.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
page_owner.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
page_poison.c
page_reporting.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
page_reporting.h
page_table_check.c	mm/page_ext: do not allocate space for page_ext->flags if not needed	2023-02-02 22:33:11 -08:00
page_vma_mapped.c	mm/hugetlb: introduce hugetlb_walk()	2023-01-18 17:12:39 -08:00
pagewalk.c	mm/hugetlb: introduce hugetlb_walk()	2023-01-18 17:12:39 -08:00
percpu-internal.h	mm: percpu: fix incorrect size in pcpu_obj_full_size()	2023-02-16 20:43:55 -08:00
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c	mm: memcontrol: rename memcg_kmem_enabled()	2023-02-16 20:43:56 -08:00
pgalloc-track.h
pgtable-generic.c	mm: add PTE pointer parameter to flush_tlb_fix_spurious_fault()	2023-03-28 16:20:12 -07:00
process_vm_access.c	use less confusing names for iov_iter direction initializers	2022-11-25 13:01:55 -05:00
ptdump.c	mm: pagewalk: Fix race between unmap and page walker	2022-09-03 10:13:13 -07:00
readahead.c	readahead: convert readahead_expand() to use a folio	2023-02-02 22:33:21 -08:00
rmap.c	mm/rmap: use atomic_try_cmpxchg in set_tlb_ubc_flush_pending	2023-03-28 16:20:09 -07:00
rodata_test.c	mm/rodata_test: use PAGE_ALIGNED() helper	2022-10-03 14:03:05 -07:00
secretmem.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
shmem.c	mm: userfaultfd: combine 'mode' and 'wp_copy' arguments	2023-04-05 19:42:48 -07:00
shrinker_debug.c	mm: shrinkers: convert shrinker_rwsem to mutex	2023-03-28 16:20:17 -07:00
shuffle.c	mm/shuffle: convert module_param_call to module_param_cb	2022-10-03 14:03:07 -07:00
shuffle.h	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
slab.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
slab.h	mm: memcontrol: rename memcg_kmem_enabled()	2023-02-16 20:43:56 -08:00
slab_common.c	mm/kasan: simplify and refine kasan_cache code	2023-01-18 17:12:55 -08:00
slob.c	Merge branch 'slab/for-6.1/kmalloc_size_roundup' into slab/for-next	2022-09-29 11:30:55 +02:00
slub.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
sparse-vmemmap.c	mm/sparse-vmemmap: generalise vmemmap_populate_hugepages()	2022-12-11 18:12:12 -08:00
sparse.c	mm/sparse: fix "unused function 'pgdat_to_phys'" warning	2023-02-02 22:33:29 -08:00
swap.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
swap.h	mm: remove the __swap_writepage return value	2023-02-02 22:33:33 -08:00
swap_cgroup.c	mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled	2022-10-03 14:03:36 -07:00
swap_slots.c	mm/swap: convert put_swap_page() to put_swap_folio()	2022-10-03 14:02:46 -07:00
swap_state.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
swapfile.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
truncate.c	mm: return an ERR_PTR from __filemap_get_folio	2023-04-05 19:42:42 -07:00
usercopy.c	mm: use kstrtobool() instead of strtobool()	2022-11-30 15:58:45 -08:00
userfaultfd.c	mm: userfaultfd: add UFFDIO_CONTINUE_MODE_WP to install WP PTEs	2023-04-05 19:42:48 -07:00
util.c	mm: fix typo in __vm_enough_memory warning	2023-02-13 15:54:33 -08:00
vmalloc.c	mm: prefer xxx_page() alloc/free functions for order-0 pages	2023-03-28 16:20:16 -07:00
vmpressure.c
vmscan.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
vmstat.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
workingset.c	swap_state: update shadow_nodes for anonymous page	2023-02-02 22:33:24 -08:00
z3fold.c	mm: remove PageMovable export	2023-01-18 17:12:57 -08:00
zbud.c	zpool: clean out dead code	2022-12-11 18:12:10 -08:00
zpool.c	zpool: clean out dead code	2022-12-11 18:12:10 -08:00
zsmalloc.c	zsmalloc: show per fullness group class stats	2023-03-28 16:20:12 -07:00
zswap.c	mm/zswap: try to avoid worst-case scenario on same element pages	2023-03-28 16:20:07 -07:00