diff mbox series

[v20,2/5] fs/proc/task_mmu: Implement IOCTL to get and optionally clear info about PTEs

Message ID 20230621072404.2918101-3-usama.anjum@collabora.com (mailing list archive)
State New
Headers show
Series Implement IOCTL to get and optionally clear info about PTEs | expand

Commit Message

Muhammad Usama Anjum June 21, 2023, 7:24 a.m. UTC
This IOCTL, PAGEMAP_SCAN on pagemap file can be used to get and/or clear
the info about page table entries. The following operations are supported
in this ioctl:
- Get the information if the pages have been written-to (PAGE_IS_WRITTEN),
  file mapped (PAGE_IS_FILE), present (PAGE_IS_PRESENT), swapped
  (PAGE_IS_SWAPPED) or page has pfn zero (PAGE_IS_PFNZERO).
- Find pages which have been written-to and/or write protect the pages
  (atomic PM_SCAN_OP_GET + PM_SCAN_OP_WP)

This IOCTL can be extended to get information about more PTE bits.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
---
Changes in v20:
- Correct PAGE_IS_FILE and add PAGE_IS_PFNZERO

Changes in v19:
- Interface changes such as renaming, return mask and WP can be used
  with any flags specified in masks
- Internal code changes

Changes in v18:
- Rebased on top of next-20230613
  - ptep_get() updates
  - remove pmd_trans_unstable() and add ACTION_AGAIN
- Review updates (Micheal)

Changes in v17:
- Rebased on next-20230606
- Made make_uffd_wp_*_pte() better and minor changes

Changes in v16:
- Fixed a corner case where kernel writes beyond user buffer by one
  element
- Bring back exclusive PM_SCAN_OP_WP
- Cosmetic changes

Changes in v15:
- Build fix:
  - Use generic tlb flush function in pagemap_scan_pmd_entry() instead of
    using x86 specific flush function in do_pagemap_scan()
  - Remove #ifdef from pagemap_scan_hugetlb_entry()
  - Use mm instead of undefined vma->vm_mm

Changes in v14:
- Fix build error caused by #ifdef added at last minute in some configs

Changes in v13:
- Review updates
- mmap_read_lock_killable() instead of mmap_read_lock()
- Replace uffd_wp_range() with helpers which increases performance
  drastically for OP_WP operations by reducing the number of tlb
  flushing etc
- Add MMU_NOTIFY_PROTECTION_VMA notification for the memory range

Changes in v12:
- Add hugetlb support to cover all memory types
- Merge "userfaultfd: Define dummy uffd_wp_range()" with this patch
- Review updates to the code

Changes in v11:
- Find written pages in a better way
- Fix a corner case (thanks Paul)
- Improve the code/comments
- remove ENGAGE_WP + ! GET operation
- shorten the commit message in favour of moving documentation to
  pagemap.rst

Changes in v10:
- move changes in tools/include/uapi/linux/fs.h to separate patch
- update commit message

Change in v8:
- Correct is_pte_uffd_wp()
- Improve readability and error checks
- Remove some un-needed code

Changes in v7:
- Rebase on top of latest next
- Fix some corner cases
- Base soft-dirty on the uffd wp async
- Update the terminologies
- Optimize the memory usage inside the ioctl
---
 fs/proc/task_mmu.c      | 560 ++++++++++++++++++++++++++++++++++++++++
 include/linux/hugetlb.h |   1 +
 include/uapi/linux/fs.h |  54 ++++
 mm/hugetlb.c            |   2 +-
 4 files changed, 616 insertions(+), 1 deletion(-)

Comments

Michał Mirosław June 21, 2023, 1:42 p.m. UTC | #1
On Wed, 21 Jun 2023 at 09:24, Muhammad Usama Anjum
<usama.anjum@collabora.com> wrote:
[...]
> +static int pagemap_scan_test_walk(unsigned long start, unsigned long end,
> +                                 struct mm_walk *walk)
> +{
> +       struct pagemap_scan_private *p = walk->private;
> +       struct vm_area_struct *vma = walk->vma;
> +
> +       if ((p->flags & PM_SCAN_REQUIRE_UFFD) && (!userfaultfd_wp_async(vma) ||
> +           !userfaultfd_wp_use_markers(vma)))
> +               return -EPERM;
> +
> +       if (vma->vm_flags & VM_PFNMAP)
> +               return 1;
> +
> +       return 0;
> +}

This could actually short-circuit all vma flags (e.g. IS_FILE): if
(required_mask & IS_FILE && vma is not file-backed) return 0;

Best Regards
Michał Mirosław
Muhammad Usama Anjum June 21, 2023, 2:16 p.m. UTC | #2
On 6/21/23 6:42 PM, Michał Mirosław wrote:
> On Wed, 21 Jun 2023 at 09:24, Muhammad Usama Anjum
> <usama.anjum@collabora.com> wrote:
> [...]
>> +static int pagemap_scan_test_walk(unsigned long start, unsigned long end,
>> +                                 struct mm_walk *walk)
>> +{
>> +       struct pagemap_scan_private *p = walk->private;
>> +       struct vm_area_struct *vma = walk->vma;
>> +
>> +       if ((p->flags & PM_SCAN_REQUIRE_UFFD) && (!userfaultfd_wp_async(vma) ||
>> +           !userfaultfd_wp_use_markers(vma)))
>> +               return -EPERM;
>> +
>> +       if (vma->vm_flags & VM_PFNMAP)
>> +               return 1;
>> +
>> +       return 0;
>> +}
> 
> This could actually short-circuit all vma flags (e.g. IS_FILE): if
> (required_mask & IS_FILE && vma is not file-backed) return 0;
Sorry, unable to understand you. Should we do something here?

> 
> Best Regards
> Michał Mirosław
Michał Mirosław June 21, 2023, 2:27 p.m. UTC | #3
On Wed, 21 Jun 2023 at 16:16, Muhammad Usama Anjum
<usama.anjum@collabora.com> wrote:
> On 6/21/23 6:42 PM, Michał Mirosław wrote:
> > On Wed, 21 Jun 2023 at 09:24, Muhammad Usama Anjum
> > <usama.anjum@collabora.com> wrote:
> > [...]
> >> +static int pagemap_scan_test_walk(unsigned long start, unsigned long end,
> >> +                                 struct mm_walk *walk)
> >> +{
> >> +       struct pagemap_scan_private *p = walk->private;
> >> +       struct vm_area_struct *vma = walk->vma;
> >> +
> >> +       if ((p->flags & PM_SCAN_REQUIRE_UFFD) && (!userfaultfd_wp_async(vma) ||
> >> +           !userfaultfd_wp_use_markers(vma)))
> >> +               return -EPERM;
> >> +
> >> +       if (vma->vm_flags & VM_PFNMAP)
> >> +               return 1;
> >> +
> >> +       return 0;
> >> +}
> >
> > This could actually short-circuit all vma flags (e.g. IS_FILE): if
> > (required_mask & IS_FILE && vma is not file-backed) return 0;
> Sorry, unable to understand you. Should we do something here?

It seems I had an earlier version of the patch in my mind, where
PAGE_IS_FILE was based on vma type. Sorry for the noise.

Best Regards
Michał Mirosław

>
> >
> > Best Regards
> > Michał Mirosław
>
> --
> BR,
> Muhammad Usama Anjum
kernel test robot June 23, 2023, 11:03 p.m. UTC | #4
Hi Muhammad,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on next-20230623]
[cannot apply to linus/master v6.4-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Muhammad-Usama-Anjum/userfaultfd-UFFD_FEATURE_WP_ASYNC/20230621-171253
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230621072404.2918101-3-usama.anjum%40collabora.com
patch subject: [PATCH v20 2/5] fs/proc/task_mmu: Implement IOCTL to get and optionally clear info about PTEs
config: s390-randconfig-s043-20230622 (https://download.01.org/0day-ci/archive/20230624/202306240610.V4FYUL8b-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230624/202306240610.V4FYUL8b-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306240610.V4FYUL8b-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/proc/task_mmu.c:2209:13: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct page_region [noderef] __user *vec @@     got struct page_region * @@
   fs/proc/task_mmu.c:2209:13: sparse:     expected struct page_region [noderef] __user *vec
   fs/proc/task_mmu.c:2209:13: sparse:     got struct page_region *

vim +2209 fs/proc/task_mmu.c

  2193	
  2194	static long do_pagemap_scan(struct mm_struct *mm, unsigned long __arg)
  2195	{
  2196		struct pm_scan_arg __user *uarg = (struct pm_scan_arg __user *)__arg;
  2197		unsigned long long start, end, walk_start, walk_end;
  2198		unsigned long long empty_slots, vec_index = 0;
  2199		struct mmu_notifier_range range;
  2200		struct page_region __user *vec;
  2201		struct pagemap_scan_private p;
  2202		struct pm_scan_arg arg;
  2203		int ret = 0;
  2204	
  2205		if (copy_from_user(&arg, uarg, sizeof(arg)))
  2206			return -EFAULT;
  2207	
  2208		start = untagged_addr((unsigned long)arg.start);
> 2209		vec = (struct page_region *)untagged_addr((unsigned long)arg.vec);
  2210	
  2211		ret = pagemap_scan_args_valid(&arg, start, vec);
  2212		if (ret)
  2213			return ret;
  2214	
  2215		end = start + arg.len;
  2216		p.max_pages = arg.max_pages;
  2217		p.found_pages = 0;
  2218		p.required_mask = arg.required_mask;
  2219		p.anyof_mask = arg.anyof_mask;
  2220		p.excluded_mask = arg.excluded_mask;
  2221		p.return_mask = arg.return_mask;
  2222		p.flags = arg.flags;
  2223		p.flags |= ((p.required_mask | p.anyof_mask | p.excluded_mask) &
  2224			    PAGE_IS_WRITTEN) ? PM_SCAN_REQUIRE_UFFD : 0;
  2225		p.cur_buf.start = p.cur_buf.len = p.cur_buf.flags = 0;
  2226		p.vec_buf = NULL;
  2227		p.vec_buf_len = PAGEMAP_WALK_SIZE >> PAGE_SHIFT;
  2228	
  2229		/*
  2230		 * Allocate smaller buffer to get output from inside the page walk
  2231		 * functions and walk page range in PAGEMAP_WALK_SIZE size chunks. As
  2232		 * we want to return output to user in compact form where no two
  2233		 * consecutive regions should be continuous and have the same flags.
  2234		 * So store the latest element in p.cur_buf between different walks and
  2235		 * store the p.cur_buf at the end of the walk to the user buffer.
  2236		 */
  2237		if (IS_PM_SCAN_GET(p.flags)) {
  2238			p.vec_buf = kmalloc_array(p.vec_buf_len, sizeof(*p.vec_buf),
  2239						  GFP_KERNEL);
  2240			if (!p.vec_buf)
  2241				return -ENOMEM;
  2242		}
  2243	
  2244		if (IS_PM_SCAN_WP(p.flags)) {
  2245			mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA, 0,
  2246						mm, start, end);
  2247			mmu_notifier_invalidate_range_start(&range);
  2248		}
  2249	
  2250		walk_start = walk_end = start;
  2251		while (walk_end < end && !ret) {
  2252			if (IS_PM_SCAN_GET(p.flags)) {
  2253				p.vec_buf_index = 0;
  2254	
  2255				/*
  2256				 * All data is copied to cur_buf first. When more data
  2257				 * is found, we push cur_buf to vec_buf and copy new
  2258				 * data to cur_buf. Subtract 1 from length as the
  2259				 * index of cur_buf isn't counted in length.
  2260				 */
  2261				empty_slots = arg.vec_len - vec_index;
  2262				p.vec_buf_len = min(p.vec_buf_len, empty_slots - 1);
  2263			}
  2264	
  2265			walk_end = (walk_start + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
  2266			if (walk_end > end)
  2267				walk_end = end;
  2268	
  2269			ret = mmap_read_lock_killable(mm);
  2270			if (ret)
  2271				goto free_data;
  2272			ret = walk_page_range(mm, walk_start, walk_end,
  2273					      &pagemap_scan_ops, &p);
  2274			mmap_read_unlock(mm);
  2275	
  2276			if (ret && ret != PM_SCAN_BUFFER_FULL &&
  2277			    ret != PM_SCAN_FOUND_MAX_PAGES)
  2278				goto free_data;
  2279	
  2280			walk_start = walk_end;
  2281			if (IS_PM_SCAN_GET(p.flags) && p.vec_buf_index) {
  2282				if (copy_to_user(&vec[vec_index], p.vec_buf,
  2283						 p.vec_buf_index * sizeof(*p.vec_buf))) {
  2284					/*
  2285					 * Return error even though the OP succeeded
  2286					 */
  2287					ret = -EFAULT;
  2288					goto free_data;
  2289				}
  2290				vec_index += p.vec_buf_index;
  2291			}
  2292		}
  2293	
  2294		if (p.cur_buf.len) {
  2295			if (copy_to_user(&vec[vec_index], &p.cur_buf, sizeof(p.cur_buf))) {
  2296				ret = -EFAULT;
  2297				goto free_data;
  2298			}
  2299			vec_index++;
  2300		}
  2301	
  2302		ret = vec_index;
  2303	
  2304	free_data:
  2305		if (IS_PM_SCAN_WP(p.flags))
  2306			mmu_notifier_invalidate_range_end(&range);
  2307	
  2308		kfree(p.vec_buf);
  2309		return ret;
  2310	}
  2311
diff mbox series

Patch

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 507cd4e59d07..c9d096db6974 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -19,6 +19,7 @@ 
 #include <linux/shmem_fs.h>
 #include <linux/uaccess.h>
 #include <linux/pkeys.h>
+#include <linux/minmax.h>
 
 #include <asm/elf.h>
 #include <asm/tlb.h>
@@ -1765,11 +1766,570 @@  static int pagemap_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
+#define PM_SCAN_REQUIRE_UFFD	(1ULL << 63)
+
+#define PM_SCAN_FOUND_MAX_PAGES	(1)
+#define PM_SCAN_BUFFER_FULL	(-256)
+
+#define PM_SCAN_BITS_ALL	(PAGE_IS_WRITTEN | PAGE_IS_FILE |	\
+				 PAGE_IS_PRESENT | PAGE_IS_SWAPPED |	\
+				 PAGE_IS_PFNZERO)
+#define PM_SCAN_OPS		(PM_SCAN_OP_GET | PM_SCAN_OP_WP)
+#define IS_PM_SCAN_GET(flags)	(flags & PM_SCAN_OP_GET)
+#define IS_PM_SCAN_WP(flags)	(flags & PM_SCAN_OP_WP)
+
+#define PM_SCAN_FLAGS(wt, file, present, swap, pfnzero)	\
+	((wt) | ((file) << 1) | ((present) << 2) |	\
+	 ((swap) << 3) | ((pfnzero) << 4))
+
+struct pagemap_scan_private {
+	struct page_region *vec_buf, cur_buf;
+	unsigned long long vec_buf_len, vec_buf_index, max_pages, found_pages, flags;
+	unsigned long long required_mask, anyof_mask, excluded_mask, return_mask;
+};
+
+static inline bool is_pte_uffd_wp(pte_t pte)
+{
+	return (pte_present(pte) && pte_uffd_wp(pte)) ||
+	       pte_swp_uffd_wp_any(pte);
+}
+
+static inline void make_uffd_wp_pte(struct vm_area_struct *vma,
+				    unsigned long addr, pte_t *pte)
+{
+	pte_t ptent = ptep_get(pte);
+
+	if (pte_present(ptent)) {
+		pte_t old_pte;
+
+		old_pte = ptep_modify_prot_start(vma, addr, pte);
+		ptent = pte_mkuffd_wp(ptent);
+		ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent);
+	} else if (is_swap_pte(ptent)) {
+		ptent = pte_swp_mkuffd_wp(ptent);
+		set_pte_at(vma->vm_mm, addr, pte, ptent);
+	} else {
+		set_pte_at(vma->vm_mm, addr, pte,
+			   make_pte_marker(PTE_MARKER_UFFD_WP));
+	}
+}
+
+static inline bool pagemap_scan_is_file(struct vm_area_struct *vma, pte_t ptent,
+					unsigned long addr)
+{
+	struct page *page = NULL;
+	swp_entry_t entry;
+
+	if (pte_present(ptent)) {
+		page = vm_normal_page(vma, addr, ptent);
+	} else {
+		entry = pte_to_swp_entry(ptent);
+		if (is_pfn_swap_entry(entry))
+			page = pfn_swap_entry_to_page(entry);
+	}
+
+	if (page && !PageAnon(page))
+		return true;
+
+	return false;
+}
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline bool is_pmd_uffd_wp(pmd_t pmd)
+{
+	return (pmd_present(pmd) && pmd_uffd_wp(pmd)) ||
+	       (is_swap_pmd(pmd) && pmd_swp_uffd_wp(pmd));
+}
+
+static inline void make_uffd_wp_pmd(struct vm_area_struct *vma,
+				    unsigned long addr, pmd_t *pmdp)
+{
+	pmd_t old, pmd = *pmdp;
+
+	if (pmd_present(pmd)) {
+		old = pmdp_invalidate_ad(vma, addr, pmdp);
+		pmd = pmd_mkuffd_wp(old);
+		set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
+	} else if (is_migration_entry(pmd_to_swp_entry(pmd))) {
+		pmd = pmd_swp_mkuffd_wp(pmd);
+		set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
+	}
+}
+#endif
+
+#ifdef CONFIG_HUGETLB_PAGE
+static inline bool is_huge_pte_uffd_wp(pte_t pte)
+{
+	return (pte_present(pte) && huge_pte_uffd_wp(pte)) ||
+	       pte_swp_uffd_wp_any(pte);
+}
+
+static inline void make_uffd_wp_huge_pte(struct vm_area_struct *vma,
+					 unsigned long addr, pte_t *ptep,
+					 pte_t ptent)
+{
+	if (is_hugetlb_entry_hwpoisoned(ptent) || is_pte_marker(ptent))
+		return;
+
+	if (is_hugetlb_entry_migration(ptent))
+		set_huge_pte_at(vma->vm_mm, addr, ptep,
+				pte_swp_mkuffd_wp(ptent));
+	else if (!huge_pte_none(ptent))
+		huge_ptep_modify_prot_commit(vma, addr, ptep, ptent,
+					     huge_pte_mkuffd_wp(ptent));
+	else
+		set_huge_pte_at(vma->vm_mm, addr, ptep,
+				make_pte_marker(PTE_MARKER_UFFD_WP));
+}
+
+static inline bool pagemap_scan_is_huge_file(pte_t pte)
+{
+	if (pte_present(pte) && (!PageAnon(pte_page(pte))))
+		return true;
+
+	return false;
+}
+#endif
+
+static int pagemap_scan_test_walk(unsigned long start, unsigned long end,
+				  struct mm_walk *walk)
+{
+	struct pagemap_scan_private *p = walk->private;
+	struct vm_area_struct *vma = walk->vma;
+
+	if ((p->flags & PM_SCAN_REQUIRE_UFFD) && (!userfaultfd_wp_async(vma) ||
+	    !userfaultfd_wp_use_markers(vma)))
+		return -EPERM;
+
+	if (vma->vm_flags & VM_PFNMAP)
+		return 1;
+
+	return 0;
+}
+
+static int pagemap_scan_output(unsigned long bitmap,
+			       struct pagemap_scan_private *p,
+			       unsigned long addr, unsigned int n_pages)
+{
+	struct page_region *cur_buf = &p->cur_buf;
+
+	if (!n_pages)
+		return -EINVAL;
+
+	bitmap &= p->return_mask;
+
+	if (cur_buf->flags == bitmap &&
+	    cur_buf->start + cur_buf->len * PAGE_SIZE == addr) {
+		cur_buf->len += n_pages;
+		p->found_pages += n_pages;
+	} else {
+		if (cur_buf->len) {
+			if (p->vec_buf_index >= p->vec_buf_len)
+				return PM_SCAN_BUFFER_FULL;
+
+			memcpy(&p->vec_buf[p->vec_buf_index], cur_buf,
+			       sizeof(*p->vec_buf));
+			p->vec_buf_index++;
+		}
+
+		cur_buf->start = addr;
+		cur_buf->len = n_pages;
+		cur_buf->flags = bitmap;
+		p->found_pages += n_pages;
+	}
+
+	if (p->found_pages == p->max_pages)
+		return PM_SCAN_FOUND_MAX_PAGES;
+
+	return 0;
+}
+
+static bool pagemap_scan_is_interesting_page(unsigned long bitmap,
+					     struct pagemap_scan_private *p)
+{
+	if ((p->required_mask & bitmap) != p->required_mask)
+		return false;
+	if (p->anyof_mask && !(p->anyof_mask & bitmap))
+		return false;
+	if (p->excluded_mask & bitmap)
+		return false;
+
+	return true;
+}
+
+static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start,
+				  unsigned long end, struct mm_walk *walk)
+{
+	bool is_written, flush = false, is_interesting = true;
+	struct pagemap_scan_private *p = walk->private;
+	struct vm_area_struct *vma = walk->vma;
+	unsigned long bitmap, addr = end;
+	pte_t *pte, *orig_pte, ptent;
+	spinlock_t *ptl;
+	int ret = 0;
+
+	arch_enter_lazy_mmu_mode();
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+	ptl = pmd_trans_huge_lock(pmd, vma);
+	if (ptl) {
+		unsigned long n_pages = (end - start)/PAGE_SIZE;
+
+		if (p->max_pages && n_pages > p->max_pages - p->found_pages)
+			n_pages = p->max_pages - p->found_pages;
+
+		is_written = !is_pmd_uffd_wp(*pmd);
+
+		/*
+		 * Break huge page into small pages if the WP operation need to
+		 * be performed is on a portion of the huge page.
+		 */
+		if (is_written && IS_PM_SCAN_WP(p->flags) &&
+		    n_pages < HPAGE_SIZE/PAGE_SIZE) {
+			spin_unlock(ptl);
+
+			split_huge_pmd(vma, pmd, start);
+			goto process_smaller_pages;
+		}
+
+		bitmap = PM_SCAN_FLAGS(is_written, false,
+				       pmd_present(*pmd), is_swap_pmd(*pmd),
+				       pmd_present(*pmd) && is_zero_pfn(pmd_pfn(*pmd)));
+
+		if (IS_PM_SCAN_GET(p->flags)) {
+			is_interesting = pagemap_scan_is_interesting_page(bitmap, p);
+			if (is_interesting)
+				ret = pagemap_scan_output(bitmap, p, start, n_pages);
+		}
+
+		if (IS_PM_SCAN_WP(p->flags) && is_written && is_interesting &&
+		    ret >= 0) {
+			make_uffd_wp_pmd(vma, start, pmd);
+			flush_tlb_range(vma, start, end);
+		}
+
+		spin_unlock(ptl);
+
+		arch_leave_lazy_mmu_mode();
+		return ret;
+	}
+
+process_smaller_pages:
+#endif
+
+	orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, start, &ptl);
+	if (!pte) {
+		walk->action = ACTION_AGAIN;
+		return 0;
+	}
+
+	for (addr = start; addr < end && !ret; pte++, addr += PAGE_SIZE) {
+		ptent = ptep_get(pte);
+		is_written = !is_pte_uffd_wp(ptent);
+
+		bitmap = PM_SCAN_FLAGS(is_written, pagemap_scan_is_file(vma, ptent, addr),
+				       pte_present(ptent), is_swap_pte(ptent),
+				       pte_present(ptent) && is_zero_pfn(pte_pfn(ptent)));
+
+		if (IS_PM_SCAN_GET(p->flags)) {
+			is_interesting = pagemap_scan_is_interesting_page(bitmap, p);
+			if (is_interesting)
+				ret = pagemap_scan_output(bitmap, p, addr, 1);
+		}
+
+		if (IS_PM_SCAN_WP(p->flags) && is_written && is_interesting &&
+		    ret >= 0) {
+			make_uffd_wp_pte(vma, addr, pte);
+			flush = true;
+		}
+	}
+
+	if (flush)
+		flush_tlb_range(vma, start, addr);
+
+	pte_unmap_unlock(orig_pte, ptl);
+	arch_leave_lazy_mmu_mode();
+
+	cond_resched();
+	return ret;
+}
+
+#ifdef CONFIG_HUGETLB_PAGE
+static int pagemap_scan_hugetlb_entry(pte_t *ptep, unsigned long hmask,
+				      unsigned long start, unsigned long end,
+				      struct mm_walk *walk)
+{
+	unsigned long n_pages = (end - start)/PAGE_SIZE;
+	struct pagemap_scan_private *p = walk->private;
+	struct vm_area_struct *vma = walk->vma;
+	bool is_written, is_interesting = true;
+	struct hstate *h = hstate_vma(vma);
+	unsigned long bitmap;
+	spinlock_t *ptl;
+	int ret = 0;
+	pte_t ptent;
+
+	if (IS_PM_SCAN_WP(p->flags) && n_pages < HPAGE_SIZE/PAGE_SIZE)
+		return -EINVAL;
+
+	if (p->max_pages && n_pages > p->max_pages - p->found_pages)
+		n_pages = p->max_pages - p->found_pages;
+
+	if (IS_PM_SCAN_WP(p->flags)) {
+		i_mmap_lock_write(vma->vm_file->f_mapping);
+		ptl = huge_pte_lock(h, vma->vm_mm, ptep);
+	}
+
+	ptent = huge_ptep_get(ptep);
+	is_written = !is_huge_pte_uffd_wp(ptent);
+
+	/*
+	 * Partial hugetlb page clear isn't supported
+	 */
+	if (is_written && IS_PM_SCAN_WP(p->flags) &&
+	    n_pages < HPAGE_SIZE/PAGE_SIZE) {
+		ret = -ENOSPC;
+		goto unlock_and_return;
+	}
+
+	bitmap = PM_SCAN_FLAGS(is_written, pagemap_scan_is_huge_file(ptent),
+			       pte_present(ptent), is_swap_pte(ptent),
+			       pte_present(ptent) && is_zero_pfn(pte_pfn(ptent)));
+
+	if (IS_PM_SCAN_GET(p->flags)) {
+		is_interesting = pagemap_scan_is_interesting_page(bitmap, p);
+		if (is_interesting)
+			ret = pagemap_scan_output(bitmap, p, start, n_pages);
+	}
+
+	if (IS_PM_SCAN_WP(p->flags) && is_written && is_interesting &&
+	    ret >= 0) {
+		make_uffd_wp_huge_pte(vma, start, ptep, ptent);
+		flush_hugetlb_tlb_range(vma, start, end);
+	}
+
+unlock_and_return:
+	if (IS_PM_SCAN_WP(p->flags)) {
+		spin_unlock(ptl);
+		i_mmap_unlock_write(vma->vm_file->f_mapping);
+	}
+
+	return ret;
+}
+#else
+#define pagemap_scan_hugetlb_entry NULL
+#endif
+
+static int pagemap_scan_pte_hole(unsigned long addr, unsigned long end,
+				 int depth, struct mm_walk *walk)
+{
+	unsigned long n_pages = (end - addr)/PAGE_SIZE;
+	struct pagemap_scan_private *p = walk->private;
+	struct vm_area_struct *vma = walk->vma;
+	int ret = 0;
+
+	if (!vma || !IS_PM_SCAN_GET(p->flags))
+		return 0;
+
+	if (p->max_pages && n_pages > p->max_pages - p->found_pages)
+		n_pages = p->max_pages - p->found_pages;
+
+	ret = pagemap_scan_output(PM_SCAN_FLAGS(false, false, false, false, false),
+				  p, addr, n_pages);
+
+	return ret;
+}
+
+static const struct mm_walk_ops pagemap_scan_ops = {
+	.test_walk = pagemap_scan_test_walk,
+	.pmd_entry = pagemap_scan_pmd_entry,
+	.pte_hole = pagemap_scan_pte_hole,
+	.hugetlb_entry = pagemap_scan_hugetlb_entry,
+};
+
+static int pagemap_scan_args_valid(struct pm_scan_arg *arg, unsigned long start,
+				   struct page_region __user *vec)
+{
+	/* Detect illegal size, flags, len and masks */
+	if (arg->size != sizeof(struct pm_scan_arg))
+		return -EINVAL;
+	if (!arg->flags)
+		return -EINVAL;
+	if (arg->flags & ~PM_SCAN_OPS)
+		return -EINVAL;
+	if (!arg->len)
+		return -EINVAL;
+	if ((arg->required_mask | arg->anyof_mask | arg->excluded_mask |
+	     arg->return_mask) & ~PM_SCAN_BITS_ALL)
+		return -EINVAL;
+	if (!arg->required_mask && !arg->anyof_mask &&
+	    !arg->excluded_mask)
+		return -EINVAL;
+	if (!arg->return_mask)
+		return -EINVAL;
+
+	/* Validate memory range */
+	if (!IS_ALIGNED(start, PAGE_SIZE))
+		return -EINVAL;
+	if (!access_ok((void __user *)start, arg->len))
+		return -EFAULT;
+
+	if (IS_PM_SCAN_GET(arg->flags)) {
+		if (arg->vec_len == 0)
+			return -EINVAL;
+		if (!vec)
+			return -EINVAL;
+		if (!access_ok((void __user *)vec,
+			       arg->vec_len * sizeof(struct page_region)))
+			return -EFAULT;
+	}
+
+	if (IS_PM_SCAN_WP(arg->flags) && !IS_PM_SCAN_GET(arg->flags) &&
+	    arg->max_pages)
+		return -EINVAL;
+
+	return 0;
+}
+
+static long do_pagemap_scan(struct mm_struct *mm, unsigned long __arg)
+{
+	struct pm_scan_arg __user *uarg = (struct pm_scan_arg __user *)__arg;
+	unsigned long long start, end, walk_start, walk_end;
+	unsigned long long empty_slots, vec_index = 0;
+	struct mmu_notifier_range range;
+	struct page_region __user *vec;
+	struct pagemap_scan_private p;
+	struct pm_scan_arg arg;
+	int ret = 0;
+
+	if (copy_from_user(&arg, uarg, sizeof(arg)))
+		return -EFAULT;
+
+	start = untagged_addr((unsigned long)arg.start);
+	vec = (struct page_region *)untagged_addr((unsigned long)arg.vec);
+
+	ret = pagemap_scan_args_valid(&arg, start, vec);
+	if (ret)
+		return ret;
+
+	end = start + arg.len;
+	p.max_pages = arg.max_pages;
+	p.found_pages = 0;
+	p.required_mask = arg.required_mask;
+	p.anyof_mask = arg.anyof_mask;
+	p.excluded_mask = arg.excluded_mask;
+	p.return_mask = arg.return_mask;
+	p.flags = arg.flags;
+	p.flags |= ((p.required_mask | p.anyof_mask | p.excluded_mask) &
+		    PAGE_IS_WRITTEN) ? PM_SCAN_REQUIRE_UFFD : 0;
+	p.cur_buf.start = p.cur_buf.len = p.cur_buf.flags = 0;
+	p.vec_buf = NULL;
+	p.vec_buf_len = PAGEMAP_WALK_SIZE >> PAGE_SHIFT;
+
+	/*
+	 * Allocate smaller buffer to get output from inside the page walk
+	 * functions and walk page range in PAGEMAP_WALK_SIZE size chunks. As
+	 * we want to return output to user in compact form where no two
+	 * consecutive regions should be continuous and have the same flags.
+	 * So store the latest element in p.cur_buf between different walks and
+	 * store the p.cur_buf at the end of the walk to the user buffer.
+	 */
+	if (IS_PM_SCAN_GET(p.flags)) {
+		p.vec_buf = kmalloc_array(p.vec_buf_len, sizeof(*p.vec_buf),
+					  GFP_KERNEL);
+		if (!p.vec_buf)
+			return -ENOMEM;
+	}
+
+	if (IS_PM_SCAN_WP(p.flags)) {
+		mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA, 0,
+					mm, start, end);
+		mmu_notifier_invalidate_range_start(&range);
+	}
+
+	walk_start = walk_end = start;
+	while (walk_end < end && !ret) {
+		if (IS_PM_SCAN_GET(p.flags)) {
+			p.vec_buf_index = 0;
+
+			/*
+			 * All data is copied to cur_buf first. When more data
+			 * is found, we push cur_buf to vec_buf and copy new
+			 * data to cur_buf. Subtract 1 from length as the
+			 * index of cur_buf isn't counted in length.
+			 */
+			empty_slots = arg.vec_len - vec_index;
+			p.vec_buf_len = min(p.vec_buf_len, empty_slots - 1);
+		}
+
+		walk_end = (walk_start + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
+		if (walk_end > end)
+			walk_end = end;
+
+		ret = mmap_read_lock_killable(mm);
+		if (ret)
+			goto free_data;
+		ret = walk_page_range(mm, walk_start, walk_end,
+				      &pagemap_scan_ops, &p);
+		mmap_read_unlock(mm);
+
+		if (ret && ret != PM_SCAN_BUFFER_FULL &&
+		    ret != PM_SCAN_FOUND_MAX_PAGES)
+			goto free_data;
+
+		walk_start = walk_end;
+		if (IS_PM_SCAN_GET(p.flags) && p.vec_buf_index) {
+			if (copy_to_user(&vec[vec_index], p.vec_buf,
+					 p.vec_buf_index * sizeof(*p.vec_buf))) {
+				/*
+				 * Return error even though the OP succeeded
+				 */
+				ret = -EFAULT;
+				goto free_data;
+			}
+			vec_index += p.vec_buf_index;
+		}
+	}
+
+	if (p.cur_buf.len) {
+		if (copy_to_user(&vec[vec_index], &p.cur_buf, sizeof(p.cur_buf))) {
+			ret = -EFAULT;
+			goto free_data;
+		}
+		vec_index++;
+	}
+
+	ret = vec_index;
+
+free_data:
+	if (IS_PM_SCAN_WP(p.flags))
+		mmu_notifier_invalidate_range_end(&range);
+
+	kfree(p.vec_buf);
+	return ret;
+}
+
+static long do_pagemap_cmd(struct file *file, unsigned int cmd,
+			   unsigned long arg)
+{
+	struct mm_struct *mm = file->private_data;
+
+	switch (cmd) {
+	case PAGEMAP_SCAN:
+		return do_pagemap_scan(mm, arg);
+
+	default:
+		return -EINVAL;
+	}
+}
+
 const struct file_operations proc_pagemap_operations = {
 	.llseek		= mem_lseek, /* borrow this */
 	.read		= pagemap_read,
 	.open		= pagemap_open,
 	.release	= pagemap_release,
+	.unlocked_ioctl = do_pagemap_cmd,
+	.compat_ioctl	= do_pagemap_cmd,
 };
 #endif /* CONFIG_PROC_PAGE_MONITOR */
 
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index beb7c63d2871..a6e773c3e2b4 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -261,6 +261,7 @@  long hugetlb_change_protection(struct vm_area_struct *vma,
 		unsigned long cp_flags);
 
 bool is_hugetlb_entry_migration(pte_t pte);
+bool is_hugetlb_entry_hwpoisoned(pte_t pte);
 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
 
 #else /* !CONFIG_HUGETLB_PAGE */
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index b7b56871029c..00dba03d4b8f 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -305,4 +305,58 @@  typedef int __bitwise __kernel_rwf_t;
 #define RWF_SUPPORTED	(RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
 			 RWF_APPEND)
 
+/* Pagemap ioctl */
+#define PAGEMAP_SCAN	_IOWR('f', 16, struct pm_scan_arg)
+
+/* Bits are set in flags of the page_region and masks in pm_scan_args */
+#define PAGE_IS_WRITTEN		(1 << 0)
+#define PAGE_IS_FILE		(1 << 1)
+#define PAGE_IS_PRESENT		(1 << 2)
+#define PAGE_IS_SWAPPED		(1 << 3)
+#define PAGE_IS_PFNZERO		(1 << 4)
+
+/*
+ * struct page_region - Page region with flags
+ * @start:	Start of the region
+ * @len:	Length of the region in pages
+ * @bitmap:	Bits sets for the region
+ */
+struct page_region {
+	__u64 start;
+	__u64 len;
+	__u64 flags;
+};
+
+/*
+ * struct pm_scan_arg - Pagemap ioctl argument
+ * @size:		Size of the structure
+ * @flags:		Flags for the IOCTL
+ * @start:		Starting address of the region
+ * @len:		Length of the region (All the pages in this length are included)
+ * @vec:		Address of page_region struct array for output
+ * @vec_len:		Length of the page_region struct array
+ * @max_pages:		Optional max return pages
+ * @required_mask:	Required mask - All of these bits have to be set in the PTE
+ * @anyof_mask:		Any mask - Any of these bits are set in the PTE
+ * @excluded_mask:	Exclude mask - None of these bits are set in the PTE
+ * @return_mask:	Bits that are to be reported in page_region
+ */
+struct pm_scan_arg {
+	__u64 size;
+	__u64 flags;
+	__u64 start;
+	__u64 len;
+	__u64 vec;
+	__u64 vec_len;
+	__u64 max_pages;
+	__u64 required_mask;
+	__u64 anyof_mask;
+	__u64 excluded_mask;
+	__u64 return_mask;
+};
+
+/* Supported flags */
+#define PM_SCAN_OP_GET	(1 << 0)
+#define PM_SCAN_OP_WP	(1 << 1)
+
 #endif /* _UAPI_LINUX_FS_H */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0db13167b1ee..7e60f0f3fd03 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4980,7 +4980,7 @@  bool is_hugetlb_entry_migration(pte_t pte)
 		return false;
 }
 
-static bool is_hugetlb_entry_hwpoisoned(pte_t pte)
+bool is_hugetlb_entry_hwpoisoned(pte_t pte)
 {
 	swp_entry_t swp;