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Peter Xu 1db9dbc2ef mm/uffd: PTE_MARKER_UFFD_WP 
This patch introduces the 1st user of pte marker: the uffd-wp marker.

When the pte marker is installed with the uffd-wp bit set, it means this
pte was wr-protected by uffd.

We will use this special pte to arm the ptes that got either unmapped or
swapped out for a file-backed region that was previously wr-protected. 
This special pte could trigger a page fault just like swap entries.

This idea is greatly inspired by Hugh and Andrea in the discussion, which
is referenced in the links below.

Some helpers are introduced to detect whether a swap pte is uffd
wr-protected.  After the pte marker introduced, one swap pte can be
wr-protected in two forms: either it is a normal swap pte and it has
_PAGE_SWP_UFFD_WP set, or it's a pte marker that has PTE_MARKER_UFFD_WP
set.

[peterx@redhat.com: fixup]
  Link: https://lkml.kernel.org/r/YkzKiM8tI4+qOfXF@xz-m1.local
Link: https://lore.kernel.org/lkml/20201126222359.8120-1-peterx@redhat.com/
Link: https://lore.kernel.org/lkml/20201130230603.46187-1-peterx@redhat.com/
Link: https://lkml.kernel.org/r/20220405014838.14131-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Suggested-by: Andrea Arcangeli <aarcange@redhat.com>
Suggested-by: Hugh Dickins <hughd@google.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-05-13 07:20:09 -07:00
..
damon
mm/damon/reclaim: support online inputs update
2022-05-13 07:20:09 -07:00
kasan
kasan: fix sleeping function called from invalid context on RT kernel
2022-04-29 14:36:58 -07:00
kfence
kfence: enable check kfence canary on panic via boot param
2022-05-13 07:20:06 -07:00
backing-dev.c
remove congestion tracking framework
2022-03-22 15:57:01 -07:00
balloon_compaction.c
mm/balloon_compaction: make balloon page compaction callbacks static
2022-03-28 16:52:57 -04:00
bootmem_info.c
bootmem: Use page->index instead of page->freelist
2022-01-06 12:27:03 +01:00
cma_debug.c
mm/cma: change cma mutex to irq safe spinlock
2021-05-05 11:27:21 -07:00
cma_sysfs.c
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
cma.c
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
cma.h
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
compaction.c
mm: compaction: make sure highest is above the min_pfn
2022-04-28 23:16:19 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE
2022-05-09 18:20:45 -07:00
debug.c
mm: unexport page_init_poison
2022-03-24 19:06:45 -07:00
dmapool.c
mm/dmapool.c: revert "make dma pool to use kmalloc_node"
2022-01-15 16:30:28 +02:00
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
remove inode_congested()
2022-03-22 15:57:01 -07:00
failslab.c
…
filemap.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
folio-compat.c
mm/rmap: Convert rmap_walk() to take a folio
2022-03-21 13:01:35 -04:00
frontswap.c
frontswap: remove support for multiple ops
2022-01-22 08:33:38 +02:00
gup_test.c
selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages
2021-05-05 11:27:26 -07:00
gup_test.h
selftests/vm: gup_test: fix test flag
2021-05-05 11:27:26 -07:00
gup.c
mm/gup: fix comments to pin_user_pages_*()
2022-05-09 18:20:47 -07:00
highmem.c
highmem: fix checks in __kmap_local_sched_{in,out}
2022-04-08 14:20:36 -10:00
hmm.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
huge_memory.c
mm: avoid unnecessary flush on change_huge_pmd()
2022-05-13 07:20:05 -07:00
hugetlb_cgroup.c
hugetlb: add hugetlb.*.numa_stat file
2022-01-15 16:30:29 +02:00
hugetlb_vmemmap.c
mm/hugetlb_vmemmap: move comment block to Documentation/vm
2022-04-28 23:16:15 -07:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*
2022-04-28 23:16:15 -07:00
hugetlb.c
mm: hugetlb: considering PMD sharing when flushing cache/TLBs
2022-05-13 07:20:07 -07:00
hwpoison-inject.c
mm/hwpoison: avoid the impact of hwpoison_filter() return value on mce handler
2022-03-22 15:57:07 -07:00
init-mm.c
kernel/fork: Initialize mm's PASID
2022-02-14 19:51:47 +01:00
internal.h
mm: compaction: clean up comment for sched contention
2022-04-28 23:16:17 -07:00
interval_tree.c
…
io-mapping.c
mm: add a io_mapping_map_user helper
2021-04-30 11:20:39 -07:00
ioremap.c
mm: move ioremap_page_range to vmalloc.c
2021-09-08 11:50:24 -07:00
Kconfig
mm/uffd: PTE_MARKER_UFFD_WP
2022-05-13 07:20:09 -07:00
Kconfig.debug
mm: page table check
2022-01-15 16:30:28 +02:00
khugepaged.c
mm/rmap: drop "compound" parameter from page_add_new_anon_rmap()
2022-05-09 18:20:43 -07:00
kmemleak.c
mm: kmemleak: take a full lowmem check in kmemleak_*_phys()
2022-04-15 14:49:56 -07:00
ksm.c
mm: remember exclusively mapped anonymous pages with PG_anon_exclusive
2022-05-09 18:20:44 -07:00
list_lru.c
mm/list_lru.c: revert "mm/list_lru: optimize memcg_reparent_list_lru_node()"
2022-04-08 14:20:36 -10:00
maccess.c
asm-generic updates for 5.18
2022-03-23 18:03:08 -07:00
madvise.c
mm: submit multipage reads for SWP_FS_OPS swap-space
2022-05-09 18:20:49 -07:00
Makefile
mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*
2022-04-28 23:16:15 -07:00
mapping_dirty_helpers.c
mm: move tlb_flush_pending inline helpers to mm_inline.h
2022-01-15 16:30:27 +02:00
memblock.c
memblock: test suite and a small cleanup
2022-03-27 13:36:06 -07:00
memcontrol.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
memfd.c
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-05 11:08:32 -08:00
memory_hotplug.c
mm/memory_hotplug: use pgprot_val to get value of pgprot
2022-05-13 07:20:07 -07:00
memory-failure.c
mm: create new mm/swap.h header file
2022-05-09 18:20:47 -07:00
memory.c
mm: check against orig_pte for finish_fault()
2022-05-13 07:20:09 -07:00
mempolicy.c
mm/mprotect: use mmu_gather
2022-05-13 07:20:05 -07:00
mempool.c
mm: remove spurious blkdev.h includes
2021-10-18 06:17:01 -06:00
memremap.c
mm/page-flags: reuse PG_mappedtodisk as PG_anon_exclusive for PageAnon() pages
2022-05-09 18:20:44 -07:00
memtest.c
…
migrate_device.c
mm: remember exclusively mapped anonymous pages with PG_anon_exclusive
2022-05-09 18:20:44 -07:00
migrate.c
mm: remember exclusively mapped anonymous pages with PG_anon_exclusive
2022-05-09 18:20:44 -07:00
mincore.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
mlock.c
mm/munlock: protect the per-CPU pagevec by a local_lock_t
2022-04-01 11:46:09 -07:00
mm_init.c
include/linux/page-flags-layout.h: cleanups
2021-04-30 11:20:42 -07:00
mmap_lock.c
mm: mmap_lock: fix disabling preemption directly
2021-07-23 17:43:28 -07:00
mmap.c
mmap locking API: fix missed mmap_sem references in comments
2022-05-13 07:20:07 -07:00
mmu_gather.c
mm/mmu_gather: limit free batch count and add schedule point in tlb_batch_pages_flush
2022-04-28 23:16:12 -07:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-21 20:01:10 -07:00
mmzone.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
mprotect.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
mremap.c
mm: hugetlb: considering PMD sharing when flushing cache/TLBs
2022-05-13 07:20:07 -07:00
msync.c
…
nommu.c
no-MMU: expose vmalloc_huge() for alloc_large_system_hash()
2022-04-25 10:11:49 -07:00
oom_kill.c
oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup
2022-04-21 20:01:10 -07:00
page_alloc.c
mm/page_alloc: cache the result of node_dirty_ok()
2022-05-13 07:20:09 -07:00
page_counter.c
mm/page_counter: remove an incorrect call to propagate_protected_usage()
2022-01-15 16:30:27 +02:00
page_ext.c
mm: use for_each_online_node and node_online instead of open coding
2022-04-29 14:36:58 -07:00
page_idle.c
mm/rmap: Constify the rmap_walk_control argument
2022-03-21 13:01:35 -04:00
page_io.c
MM: handle THP in swap_*page_fs() - count_vm_events()
2022-05-09 18:20:49 -07:00
page_isolation.c
mm: wrap __find_buddy_pfn() with a necessary buddy page validation
2022-04-28 23:16:01 -07:00
page_owner.c
mm/page_owner.c: record tgid
2022-03-24 19:06:44 -07:00
page_poison.c
…
page_reporting.c
mm/page_reporting: allow driver to specify reporting order
2021-06-29 10:53:47 -07:00
page_reporting.h
mm/page_reporting: export reporting order as module parameter
2021-06-29 10:53:47 -07:00
page_table_check.c
mm/page_table_check.c: use strtobool for param parsing
2022-03-22 15:57:11 -07:00
page_vma_mapped.c
mm: pvmw: add support for walking devmap pages
2022-04-28 23:16:10 -07:00
page-writeback.c
mm: rework calculation of bdi_min_ratio in bdi_set_min_ratio
2022-04-28 23:15:57 -07:00
pagewalk.c
mm: pagewalk: fix walk for hugepage tables
2021-06-29 10:53:49 -07:00
percpu-internal.h
mm: memcg/percpu: account extra objcg space to memory cgroups
2022-01-15 16:30:31 +02:00
percpu-km.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu-stats.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu.c
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
pgalloc-track.h
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
pgtable-generic.c
mm: avoid unnecessary flush on change_huge_pmd()
2022-05-13 07:20:05 -07:00
process_vm_access.c
mm/process_vm_access.c: remove duplicate include
2021-05-05 11:27:27 -07:00
ptdump.c
mm: sparsemem: use page table lock to protect kernel pmd operations
2022-03-22 15:57:08 -07:00
readahead.c
readahead: Update comments
2022-04-01 14:40:42 -04:00
rmap.c
mm/rmap: Fix typos in comments
2022-05-13 07:20:07 -07:00
rodata_test.c
…
secretmem.c
mm/secretmem: fix panic when growing a memfd_secret
2022-04-15 14:49:54 -07:00
shmem.c
mm: create new mm/swap.h header file
2022-05-09 18:20:47 -07:00
shuffle.c
…
shuffle.h
mm/shuffle: fix section mismatch warning
2021-05-22 15:09:07 -10:00
slab_common.c
mm: make minimum slab alignment a runtime property
2022-05-13 07:20:07 -07:00
slab.c
mm: make minimum slab alignment a runtime property
2022-05-13 07:20:07 -07:00
slab.h
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-15 14:49:55 -07:00
slob.c
mm: make minimum slab alignment a runtime property
2022-05-13 07:20:07 -07:00
slub.c
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-15 14:49:55 -07:00
sparse-vmemmap.c
mm/sparse-vmemmap: improve memory savings for compound devmaps
2022-04-28 23:16:16 -07:00
sparse.c
mm/sparse-vmemmap: add a pgmap argument to section activation
2022-04-28 23:16:15 -07:00
swap_cgroup.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
swap_slots.c
treewide: Add missing includes masked by cgroup -> bpf dependency
2021-12-03 10:58:13 -08:00
swap_state.c
mm: submit multipage reads for SWP_FS_OPS swap-space
2022-05-09 18:20:49 -07:00
swap.c
mm/munlock: protect the per-CPU pagevec by a local_lock_t
2022-04-01 11:46:09 -07:00
swap.h
mm: submit multipage write for SWP_FS_OPS swap-space
2022-05-09 18:20:49 -07:00
swapfile.c
mm: introduce ->swap_rw and use it for reads from SWP_FS_OPS swap-space
2022-05-09 18:20:48 -07:00
truncate.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
usercopy.c
Merge branch 'akpm' (patches from Andrew)
2022-03-22 16:11:53 -07:00
userfaultfd.c
mm/mprotect: use mmu_gather
2022-05-13 07:20:05 -07:00
util.c
mm: create new mm/swap.h header file
2022-05-09 18:20:47 -07:00
vmacache.c
…
vmalloc.c
vmap(): don't allow invalid pages
2022-04-28 23:16:00 -07:00
vmpressure.c
mm/vmpressure: fix data-race with memcg->socket_pressure
2021-11-06 13:30:40 -07:00
vmscan.c
mm: submit multipage write for SWP_FS_OPS swap-space
2022-05-09 18:20:49 -07:00
vmstat.c
mm/vmstat: add events for ksm cow
2022-04-28 23:16:16 -07:00
workingset.c
memcg: sync flush only if periodic flush is delayed
2022-04-21 20:01:09 -07:00
z3fold.c
mm/z3fold: remove unneeded PAGE_HEADLESS check in free_handle()
2022-04-28 23:16:06 -07:00
zbud.c
mm/zbud: add kerneldoc fields for zbud_pool
2021-07-01 11:06:03 -07:00
zpool.c
zpool: remove the list of pools_head
2022-01-15 16:30:31 +02:00
zsmalloc.c
zsmalloc: replace get_cpu_var with local_lock
2022-01-22 08:33:37 +02:00
zswap.c
mm: create new mm/swap.h header file
2022-05-09 18:20:47 -07:00