On 01/11/2015 02:24 PM, Oded Gabbay wrote:
>
>
> On 01/06/2015 12:44 AM, j.glisse@xxxxxxxxx wrote:
>> From: Jérôme Glisse <jglisse@xxxxxxxxxx>
>>
>> The event information will be useful for new user of mmu_notifier API.
>> The event argument differentiate between a vma disappearing, a page
>> being write protected or simply a page being unmaped. This allow new
>> user to take different path for different event for instance on unmap
>> the resource used to track a vma are still valid and should stay around.
>> While if the event is saying that a vma is being destroy it means that any
>> resources used to track this vma can be free.
>>
>> Changed since v1:
>> - renamed action into event (updated commit message too).
>> - simplified the event names and clarified their usage
>> also documenting what exceptation the listener can have in
>> respect to each event.
>>
>> Changed since v2:
>> - Avoid crazy name.
>> - Do not move code that do not need to move.
>>
>> Changed since v3:
>> - Separate hugue page split from mlock/munlock and softdirty.
>>
>> Changed since v4:
>> - Rebase (no other changes).
>>
>> Changed since v5:
>> - Typo fix.
>> - Changed zap_page_range from MMU_MUNMAP to MMU_MIGRATE to reflect the
>> fact that the address range is still valid just the page backing it
>> are no longer.
>>
>> Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
>> Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
>> ---
>> drivers/gpu/drm/i915/i915_gem_userptr.c | 3 +-
>> drivers/gpu/drm/radeon/radeon_mn.c | 3 +-
>> drivers/infiniband/core/umem_odp.c | 9 ++-
>> drivers/iommu/amd_iommu_v2.c | 3 +-
>> drivers/misc/sgi-gru/grutlbpurge.c | 9 ++-
>> drivers/xen/gntdev.c | 9 ++-
>> fs/proc/task_mmu.c | 6 +-
>> include/linux/mmu_notifier.h | 131 ++++++++++++++++++++++++++------
>> kernel/events/uprobes.c | 10 ++-
>> mm/filemap_xip.c | 2 +-
>> mm/huge_memory.c | 39 ++++++----
>> mm/hugetlb.c | 23 +++---
>> mm/ksm.c | 18 +++--
>> mm/madvise.c | 4 +-
>> mm/memory.c | 27 ++++---
>> mm/migrate.c | 9 ++-
>> mm/mmu_notifier.c | 28 ++++---
>> mm/mprotect.c | 6 +-
>> mm/mremap.c | 6 +-
>> mm/rmap.c | 24 ++++--
>> virt/kvm/kvm_main.c | 12 ++-
>> 21 files changed, 274 insertions(+), 107 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
>> index d182058..20dbd26 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_userptr.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
>> @@ -129,7 +129,8 @@ restart:
>> static void i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn,
>> struct mm_struct *mm,
>> unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct i915_mmu_notifier *mn = container_of(_mn, struct i915_mmu_notifier, mn);
>> struct interval_tree_node *it = NULL;
>> diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
>> index a69bd44..daf53d3 100644
>> --- a/drivers/gpu/drm/radeon/radeon_mn.c
>> +++ b/drivers/gpu/drm/radeon/radeon_mn.c
>> @@ -109,7 +109,8 @@ static void radeon_mn_release(struct mmu_notifier *mn,
>> static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
>> struct interval_tree_node *it;
>> diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
>> index 6095872..bc36e8c 100644
>> --- a/drivers/infiniband/core/umem_odp.c
>> +++ b/drivers/infiniband/core/umem_odp.c
>> @@ -165,7 +165,8 @@ static int invalidate_page_trampoline(struct ib_umem *item, u64 start,
>>
>> static void ib_umem_notifier_invalidate_page(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
>>
>> @@ -192,7 +193,8 @@ static int invalidate_range_start_trampoline(struct ib_umem *item, u64 start,
>> static void ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
>>
>> @@ -217,7 +219,8 @@ static int invalidate_range_end_trampoline(struct ib_umem *item, u64 start,
>> static void ib_umem_notifier_invalidate_range_end(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
>>
>> diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
>> index 90f70d0..31acb07 100644
>> --- a/drivers/iommu/amd_iommu_v2.c
>> +++ b/drivers/iommu/amd_iommu_v2.c
>> @@ -402,7 +402,8 @@ static int mn_clear_flush_young(struct mmu_notifier *mn,
>>
>> static void mn_invalidate_page(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> __mn_flush_page(mn, address);
>> }
>> diff --git a/drivers/misc/sgi-gru/grutlbpurge.c b/drivers/misc/sgi-gru/grutlbpurge.c
>> index 2129274..e67fed1 100644
>> --- a/drivers/misc/sgi-gru/grutlbpurge.c
>> +++ b/drivers/misc/sgi-gru/grutlbpurge.c
>> @@ -221,7 +221,8 @@ void gru_flush_all_tlb(struct gru_state *gru)
>> */
>> static void gru_invalidate_range_start(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start, unsigned long end,
>> + enum mmu_event event)
>> {
>> struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
>> ms_notifier);
>> @@ -235,7 +236,8 @@ static void gru_invalidate_range_start(struct mmu_notifier *mn,
>>
>> static void gru_invalidate_range_end(struct mmu_notifier *mn,
>> struct mm_struct *mm, unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
>> ms_notifier);
>> @@ -248,7 +250,8 @@ static void gru_invalidate_range_end(struct mmu_notifier *mn,
>> }
>>
>> static void gru_invalidate_page(struct mmu_notifier *mn, struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
>> ms_notifier);
>> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
>> index 073b4a1..fe9da94 100644
>> --- a/drivers/xen/gntdev.c
>> +++ b/drivers/xen/gntdev.c
>> @@ -428,7 +428,9 @@ static void unmap_if_in_range(struct grant_map *map,
>>
>> static void mn_invl_range_start(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct gntdev_priv *priv = container_of(mn, struct gntdev_priv, mn);
>> struct grant_map *map;
>> @@ -445,9 +447,10 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
>>
>> static void mn_invl_page(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> - mn_invl_range_start(mn, mm, address, address + PAGE_SIZE);
>> + mn_invl_range_start(mn, mm, address, address + PAGE_SIZE, event);
>> }
>>
>> static void mn_release(struct mmu_notifier *mn,
>> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
>> index 246eae8..8a79a74 100644
>> --- a/fs/proc/task_mmu.c
>> +++ b/fs/proc/task_mmu.c
>> @@ -875,7 +875,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
>> downgrade_write(&mm->mmap_sem);
>> break;
>> }
>> - mmu_notifier_invalidate_range_start(mm, 0, -1);
>> + mmu_notifier_invalidate_range_start(mm, 0,
>> + -1, MMU_ISDIRTY);
>> }
>> for (vma = mm->mmap; vma; vma = vma->vm_next) {
>> cp.vma = vma;
>> @@ -900,7 +901,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
>> &clear_refs_walk);
>> }
>> if (type == CLEAR_REFS_SOFT_DIRTY)
>> - mmu_notifier_invalidate_range_end(mm, 0, -1);
>> + mmu_notifier_invalidate_range_end(mm, 0,
>> + -1, MMU_ISDIRTY);
>> flush_tlb_mm(mm);
>> up_read(&mm->mmap_sem);
>> mmput(mm);
>> diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
>> index 95243d2..ac2a121 100644
>> --- a/include/linux/mmu_notifier.h
>> +++ b/include/linux/mmu_notifier.h
>> @@ -9,6 +9,66 @@
>> struct mmu_notifier;
>> struct mmu_notifier_ops;
>>
>> +/* MMU Events report fine-grained information to the callback routine, allowing
>> + * the event listener to make a more informed decision as to what action to
>> + * take. The event types are:
>> + *
>> + * - MMU_HSPLIT huge page split, the memory is the same only the page table
>> + * structure is updated (level added or removed).
>> + *
>> + * - MMU_ISDIRTY need to update the dirty bit of the page table so proper
>> + * dirty accounting can happen.
>> + *
>> + * - MMU_MIGRATE: memory is migrating from one page to another, thus all write
>> + * access must stop after invalidate_range_start callback returns.
>> + * Furthermore, no read access should be allowed either, as a new page can
>> + * be remapped with write access before the invalidate_range_end callback
>> + * happens and thus any read access to old page might read stale data. There
>> + * are several sources for this event, including:
>> + *
>> + * - A page moving to swap (various reasons, including page reclaim),
>> + * - An mremap syscall,
>> + * - migration for NUMA reasons,
>> + * - balancing the memory pool,
>> + * - write fault on COW page,
>> + * - and more that are not listed here.
>> + *
>> + * - MMU_MPROT: memory access protection is changing. Refer to the vma to get
>> + * the new access protection. All memory access are still valid until the
>> + * invalidate_range_end callback.
>> + *
>> + * - MMU_MUNLOCK: unlock memory. Content of page table stays the same but
>> + * page are unlocked.
>> + *
>> + * - MMU_MUNMAP: the range is being unmapped (outcome of a munmap syscall or
>> + * process destruction). However, access is still allowed, up until the
>> + * invalidate_range_free_pages callback. This also implies that secondary
>> + * page table can be trimmed, because the address range is no longer valid.
>> + *
>> + * - MMU_WRITE_BACK: memory is being written back to disk, all write accesses
>> + * must stop after invalidate_range_start callback returns. Read access are
>> + * still allowed.
>> + *
>> + * - MMU_WRITE_PROTECT: memory is being write protected (ie should be mapped
>> + * read only no matter what the vma memory protection allows). All write
>> + * accesses must stop after invalidate_range_start callback returns. Read
>> + * access are still allowed.
>> + *
>> + * If in doubt when adding a new notifier caller, please use MMU_MIGRATE,
>> + * because it will always lead to reasonable behavior, but will not allow the
>> + * listener a chance to optimize its events.
>> + */
>> +enum mmu_event {
>> + MMU_HSPLIT = 0,
>> + MMU_ISDIRTY,
>> + MMU_MIGRATE,
>> + MMU_MPROT,
>> + MMU_MUNLOCK,
>> + MMU_MUNMAP,
>> + MMU_WRITE_BACK,
>> + MMU_WRITE_PROTECT,
>> +};
>> +
>> #ifdef CONFIG_MMU_NOTIFIER
>>
>> /*
>> @@ -82,7 +142,8 @@ struct mmu_notifier_ops {
>> void (*change_pte)(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long address,
>> - pte_t pte);
>> + pte_t pte,
>> + enum mmu_event event);
>>
>> /*
>> * Before this is invoked any secondary MMU is still ok to
>> @@ -93,7 +154,8 @@ struct mmu_notifier_ops {
>> */
>> void (*invalidate_page)(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long address);
>> + unsigned long address,
>> + enum mmu_event event);
>>
>> /*
>> * invalidate_range_start() and invalidate_range_end() must be
>> @@ -140,10 +202,14 @@ struct mmu_notifier_ops {
>> */
>> void (*invalidate_range_start)(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long start, unsigned long end);
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event);
>> void (*invalidate_range_end)(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long start, unsigned long end);
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event);
>>
>> /*
>> * invalidate_range() is either called between
>> @@ -206,13 +272,20 @@ extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
>> extern int __mmu_notifier_test_young(struct mm_struct *mm,
>> unsigned long address);
>> extern void __mmu_notifier_change_pte(struct mm_struct *mm,
>> - unsigned long address, pte_t pte);
>> + unsigned long address,
>> + pte_t pte,
>> + enum mmu_event event);
>> extern void __mmu_notifier_invalidate_page(struct mm_struct *mm,
>> - unsigned long address);
>> + unsigned long address,
>> + enum mmu_event event);
>> extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
>> - unsigned long start, unsigned long end);
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event);
>> extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
>> - unsigned long start, unsigned long end);
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event);
>> extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
>> unsigned long start, unsigned long end);
>>
>> @@ -240,31 +313,38 @@ static inline int mmu_notifier_test_young(struct mm_struct *mm,
>> }
>>
>> static inline void mmu_notifier_change_pte(struct mm_struct *mm,
>> - unsigned long address, pte_t pte)
>> + unsigned long address,
>> + pte_t pte,
>> + enum mmu_event event)
>> {
>> if (mm_has_notifiers(mm))
>> - __mmu_notifier_change_pte(mm, address, pte);
>> + __mmu_notifier_change_pte(mm, address, pte, event);
>> }
>>
>> static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> if (mm_has_notifiers(mm))
>> - __mmu_notifier_invalidate_page(mm, address);
>> + __mmu_notifier_invalidate_page(mm, address, event);
>> }
>>
>> static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> if (mm_has_notifiers(mm))
>> - __mmu_notifier_invalidate_range_start(mm, start, end);
>> + __mmu_notifier_invalidate_range_start(mm, start, end, event);
>> }
>>
>> static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> if (mm_has_notifiers(mm))
>> - __mmu_notifier_invalidate_range_end(mm, start, end);
>> + __mmu_notifier_invalidate_range_end(mm, start, end, event);
>> }
>>
>> static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
>> @@ -359,13 +439,13 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
>> * old page would remain mapped readonly in the secondary MMUs after the new
>> * page is already writable by some CPU through the primary MMU.
>> */
>> -#define set_pte_at_notify(__mm, __address, __ptep, __pte) \
>> +#define set_pte_at_notify(__mm, __address, __ptep, __pte, __event) \
>> ({ \
>> struct mm_struct *___mm = __mm; \
>> unsigned long ___address = __address; \
>> pte_t ___pte = __pte; \
>> \
>> - mmu_notifier_change_pte(___mm, ___address, ___pte); \
>> + mmu_notifier_change_pte(___mm, ___address, ___pte, __event); \
>> set_pte_at(___mm, ___address, __ptep, ___pte); \
>> })
>>
>> @@ -393,22 +473,29 @@ static inline int mmu_notifier_test_young(struct mm_struct *mm,
>> }
>>
>> static inline void mmu_notifier_change_pte(struct mm_struct *mm,
>> - unsigned long address, pte_t pte)
>> + unsigned long address,
>> + pte_t pte,
>> + enum mmu_event event)
>> {
>> }
>>
>> static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> }
>>
>> static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> }
>>
>> static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> }
>>
>> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
>> index cb346f2..802828a 100644
>> --- a/kernel/events/uprobes.c
>> +++ b/kernel/events/uprobes.c
>> @@ -176,7 +176,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
>> /* For try_to_free_swap() and munlock_vma_page() below */
>> lock_page(page);
>>
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> err = -EAGAIN;
>> ptep = page_check_address(page, mm, addr, &ptl, 0);
>> if (!ptep)
>> @@ -194,7 +195,9 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
>>
>> flush_cache_page(vma, addr, pte_pfn(*ptep));
>> ptep_clear_flush_notify(vma, addr, ptep);
>> - set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
>> + set_pte_at_notify(mm, addr, ptep,
>> + mk_pte(kpage, vma->vm_page_prot),
>> + MMU_MIGRATE);
>>
>> page_remove_rmap(page);
>> if (!page_mapped(page))
>> @@ -208,7 +211,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
>> err = 0;
>> unlock:
>> mem_cgroup_cancel_charge(kpage, memcg);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> unlock_page(page);
>> return err;
>> }
>> diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
>> index 0d105ae..fb97c7c 100644
>> --- a/mm/filemap_xip.c
>> +++ b/mm/filemap_xip.c
>> @@ -193,7 +193,7 @@ retry:
>> BUG_ON(pte_dirty(pteval));
>> pte_unmap_unlock(pte, ptl);
>> /* must invalidate_page _before_ freeing the page */
>> - mmu_notifier_invalidate_page(mm, address);
>> + mmu_notifier_invalidate_page(mm, address, MMU_MIGRATE);
>> page_cache_release(page);
>> }
>> }
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index cf3b67b..75eb651 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -1028,7 +1028,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
>>
>> mmun_start = haddr;
>> mmun_end = haddr + HPAGE_PMD_SIZE;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>>
>> ptl = pmd_lock(mm, pmd);
>> if (unlikely(!pmd_same(*pmd, orig_pmd)))
>> @@ -1062,7 +1063,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
>> page_remove_rmap(page);
>> spin_unlock(ptl);
>>
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> ret |= VM_FAULT_WRITE;
>> put_page(page);
>> @@ -1072,7 +1074,8 @@ out:
>>
>> out_free_pages:
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> for (i = 0; i < HPAGE_PMD_NR; i++) {
>> memcg = (void *)page_private(pages[i]);
>> set_page_private(pages[i], 0);
>> @@ -1164,7 +1167,8 @@ alloc:
>>
>> mmun_start = haddr;
>> mmun_end = haddr + HPAGE_PMD_SIZE;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>>
>> spin_lock(ptl);
>> if (page)
>> @@ -1196,7 +1200,8 @@ alloc:
>> }
>> spin_unlock(ptl);
>> out_mn:
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> out:
>> return ret;
>> out_unlock:
>> @@ -1667,7 +1672,8 @@ static int __split_huge_page_splitting(struct page *page,
>> const unsigned long mmun_start = address;
>> const unsigned long mmun_end = address + HPAGE_PMD_SIZE;
>>
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_HSPLIT);
>> pmd = page_check_address_pmd(page, mm, address,
>> PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, &ptl);
>> if (pmd) {
>> @@ -1683,7 +1689,8 @@ static int __split_huge_page_splitting(struct page *page,
>> ret = 1;
>> spin_unlock(ptl);
>> }
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_HSPLIT);
>>
>> return ret;
>> }
>> @@ -2504,7 +2511,8 @@ static void collapse_huge_page(struct mm_struct *mm,
>>
>> mmun_start = address;
>> mmun_end = address + HPAGE_PMD_SIZE;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */
>> /*
>> * After this gup_fast can't run anymore. This also removes
>> @@ -2514,7 +2522,8 @@ static void collapse_huge_page(struct mm_struct *mm,
>> */
>> _pmd = pmdp_clear_flush(vma, address, pmd);
>> spin_unlock(pmd_ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> spin_lock(pte_ptl);
>> isolated = __collapse_huge_page_isolate(vma, address, pte);
>> @@ -2905,24 +2914,28 @@ void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address,
>> mmun_start = haddr;
>> mmun_end = haddr + HPAGE_PMD_SIZE;
>> again:
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> ptl = pmd_lock(mm, pmd);
>> if (unlikely(!pmd_trans_huge(*pmd))) {
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> return;
>> }
>> if (is_huge_zero_pmd(*pmd)) {
>> __split_huge_zero_page_pmd(vma, haddr, pmd);
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> return;
>> }
>> page = pmd_page(*pmd);
>> VM_BUG_ON_PAGE(!page_count(page), page);
>> get_page(page);
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> split_huge_page(page);
>>
>> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
>> index 85032de..b4770c4 100644
>> --- a/mm/hugetlb.c
>> +++ b/mm/hugetlb.c
>> @@ -2560,7 +2560,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
>> mmun_start = vma->vm_start;
>> mmun_end = vma->vm_end;
>> if (cow)
>> - mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(src, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) {
>> spinlock_t *src_ptl, *dst_ptl;
>> @@ -2614,7 +2615,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
>> }
>>
>> if (cow)
>> - mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(src, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> return ret;
>> }
>> @@ -2640,7 +2642,8 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
>> BUG_ON(end & ~huge_page_mask(h));
>>
>> tlb_start_vma(tlb, vma);
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> address = start;
>> again:
>> for (; address < end; address += sz) {
>> @@ -2713,7 +2716,8 @@ unlock:
>> if (address < end && !ref_page)
>> goto again;
>> }
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> tlb_end_vma(tlb, vma);
>> }
>>
>> @@ -2891,8 +2895,8 @@ retry_avoidcopy:
>>
>> mmun_start = address & huge_page_mask(h);
>> mmun_end = mmun_start + huge_page_size(h);
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> -
>> + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>> /*
>> * Retake the page table lock to check for racing updates
>> * before the page tables are altered
>> @@ -2913,7 +2917,8 @@ retry_avoidcopy:
>> new_page = old_page;
>> }
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>> out_release_all:
>> page_cache_release(new_page);
>> out_release_old:
>> @@ -3351,7 +3356,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
>> BUG_ON(address >= end);
>> flush_cache_range(vma, address, end);
>>
>> - mmu_notifier_invalidate_range_start(mm, start, end);
>> + mmu_notifier_invalidate_range_start(mm, start, end, MMU_MPROT);
>> i_mmap_lock_write(vma->vm_file->f_mapping);
>> for (; address < end; address += huge_page_size(h)) {
>> spinlock_t *ptl;
>> @@ -3382,7 +3387,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
>> flush_tlb_range(vma, start, end);
>> mmu_notifier_invalidate_range(mm, start, end);
>> i_mmap_unlock_write(vma->vm_file->f_mapping);
>> - mmu_notifier_invalidate_range_end(mm, start, end);
>> + mmu_notifier_invalidate_range_end(mm, start, end, MMU_MPROT);
>>
>> return pages << h->order;
>> }
>> diff --git a/mm/ksm.c b/mm/ksm.c
>> index d247efa..8c3a892 100644
>> --- a/mm/ksm.c
>> +++ b/mm/ksm.c
>> @@ -872,7 +872,8 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
>>
>> mmun_start = addr;
>> mmun_end = addr + PAGE_SIZE;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
>> + MMU_WRITE_PROTECT);
>>
>> ptep = page_check_address(page, mm, addr, &ptl, 0);
>> if (!ptep)
>> @@ -904,7 +905,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
>> if (pte_dirty(entry))
>> set_page_dirty(page);
>> entry = pte_mkclean(pte_wrprotect(entry));
>> - set_pte_at_notify(mm, addr, ptep, entry);
>> + set_pte_at_notify(mm, addr, ptep, entry, MMU_WRITE_PROTECT);
>> }
>> *orig_pte = *ptep;
>> err = 0;
>> @@ -912,7 +913,8 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
>> out_unlock:
>> pte_unmap_unlock(ptep, ptl);
>> out_mn:
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end,
>> + MMU_WRITE_PROTECT);
>> out:
>> return err;
>> }
>> @@ -948,7 +950,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
>>
>> mmun_start = addr;
>> mmun_end = addr + PAGE_SIZE;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>>
>> ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
>> if (!pte_same(*ptep, orig_pte)) {
>> @@ -961,7 +964,9 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
>>
>> flush_cache_page(vma, addr, pte_pfn(*ptep));
>> ptep_clear_flush_notify(vma, addr, ptep);
>> - set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
>> + set_pte_at_notify(mm, addr, ptep,
>> + mk_pte(kpage, vma->vm_page_prot),
>> + MMU_MIGRATE);
>>
>> page_remove_rmap(page);
>> if (!page_mapped(page))
>> @@ -971,7 +976,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
>> pte_unmap_unlock(ptep, ptl);
>> err = 0;
>> out_mn:
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>> out:
>> return err;
>> }
>> diff --git a/mm/madvise.c b/mm/madvise.c
>> index 6fc9b82..d7ac37a 100644
>> --- a/mm/madvise.c
>> +++ b/mm/madvise.c
>> @@ -376,9 +376,9 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
>> tlb_gather_mmu(&tlb, mm, start, end);
>> update_hiwater_rss(mm);
>>
>> - mmu_notifier_invalidate_range_start(mm, start, end);
>> + mmu_notifier_invalidate_range_start(mm, start, end, MMU_MUNMAP);
>> madvise_free_page_range(&tlb, vma, start, end);
>> - mmu_notifier_invalidate_range_end(mm, start, end);
>> + mmu_notifier_invalidate_range_end(mm, start, end, MMU_MUNMAP);
>> tlb_finish_mmu(&tlb, start, end);
>>
>> return 0;
>> diff --git a/mm/memory.c b/mm/memory.c
>> index eacfafc..c184ee9 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -1050,7 +1050,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
>> mmun_end = end;
>> if (is_cow)
>> mmu_notifier_invalidate_range_start(src_mm, mmun_start,
>> - mmun_end);
>> + mmun_end, MMU_MIGRATE);
>>
>> ret = 0;
>> dst_pgd = pgd_offset(dst_mm, addr);
>> @@ -1067,7 +1067,8 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
>> } while (dst_pgd++, src_pgd++, addr = next, addr != end);
>>
>> if (is_cow)
>> - mmu_notifier_invalidate_range_end(src_mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(src_mm, mmun_start, mmun_end,
>> + MMU_MIGRATE);
>> return ret;
>> }
>>
>> @@ -1360,10 +1361,12 @@ void unmap_vmas(struct mmu_gather *tlb,
>> {
>> struct mm_struct *mm = vma->vm_mm;
>>
>> - mmu_notifier_invalidate_range_start(mm, start_addr, end_addr);
>> + mmu_notifier_invalidate_range_start(mm, start_addr,
>> + end_addr, MMU_MUNMAP);
>> for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next)
>> unmap_single_vma(tlb, vma, start_addr, end_addr, NULL);
>> - mmu_notifier_invalidate_range_end(mm, start_addr, end_addr);
>> + mmu_notifier_invalidate_range_end(mm, start_addr,
>> + end_addr, MMU_MUNMAP);
>> }
>>
>> /**
>> @@ -1385,10 +1388,10 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
>> lru_add_drain();
>> tlb_gather_mmu(&tlb, mm, start, end);
>> update_hiwater_rss(mm);
>> - mmu_notifier_invalidate_range_start(mm, start, end);
>> + mmu_notifier_invalidate_range_start(mm, start, end, MMU_MIGRATE);
>> for ( ; vma && vma->vm_start < end; vma = vma->vm_next)
>> unmap_single_vma(&tlb, vma, start, end, details);
>> - mmu_notifier_invalidate_range_end(mm, start, end);
>> + mmu_notifier_invalidate_range_end(mm, start, end, MMU_MIGRATE);
>> tlb_finish_mmu(&tlb, start, end);
>> }
>>
>> @@ -1411,9 +1414,9 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr
>> lru_add_drain();
>> tlb_gather_mmu(&tlb, mm, address, end);
>> update_hiwater_rss(mm);
>> - mmu_notifier_invalidate_range_start(mm, address, end);
>> + mmu_notifier_invalidate_range_start(mm, address, end, MMU_MUNMAP);
>> unmap_single_vma(&tlb, vma, address, end, details);
>> - mmu_notifier_invalidate_range_end(mm, address, end);
>> + mmu_notifier_invalidate_range_end(mm, address, end, MMU_MUNMAP);
>> tlb_finish_mmu(&tlb, address, end);
>> }
>>
>> @@ -2198,7 +2201,8 @@ gotten:
>>
>> mmun_start = address & PAGE_MASK;
>> mmun_end = mmun_start + PAGE_SIZE;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> /*
>> * Re-check the pte - we dropped the lock
>> @@ -2230,7 +2234,7 @@ gotten:
>> * mmu page tables (such as kvm shadow page tables), we want the
>> * new page to be mapped directly into the secondary page table.
>> */
>> - set_pte_at_notify(mm, address, page_table, entry);
>> + set_pte_at_notify(mm, address, page_table, entry, MMU_MIGRATE);
>> update_mmu_cache(vma, address, page_table);
>> if (old_page) {
>> /*
>> @@ -2269,7 +2273,8 @@ gotten:
>> unlock:
>> pte_unmap_unlock(page_table, ptl);
>> if (mmun_end > mmun_start)
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> if (old_page) {
>> /*
>> * Don't let another task, with possibly unlocked vma,
>> diff --git a/mm/migrate.c b/mm/migrate.c
>> index 344cdf6..254d5bf 100644
>> --- a/mm/migrate.c
>> +++ b/mm/migrate.c
>> @@ -1801,12 +1801,14 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
>> WARN_ON(PageLRU(new_page));
>>
>> /* Recheck the target PMD */
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>> ptl = pmd_lock(mm, pmd);
>> if (unlikely(!pmd_same(*pmd, entry) || page_count(page) != 2)) {
>> fail_putback:
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> /* Reverse changes made by migrate_page_copy() */
>> if (TestClearPageActive(new_page))
>> @@ -1860,7 +1862,8 @@ fail_putback:
>> page_remove_rmap(page);
>>
>> spin_unlock(ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> /* Take an "isolate" reference and put new page on the LRU. */
>> get_page(new_page);
>> diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
>> index 3b9b3d0..e51ea02 100644
>> --- a/mm/mmu_notifier.c
>> +++ b/mm/mmu_notifier.c
>> @@ -142,8 +142,10 @@ int __mmu_notifier_test_young(struct mm_struct *mm,
>> return young;
>> }
>>
>> -void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address,
>> - pte_t pte)
>> +void __mmu_notifier_change_pte(struct mm_struct *mm,
>> + unsigned long address,
>> + pte_t pte,
>> + enum mmu_event event)
>> {
>> struct mmu_notifier *mn;
>> int id;
>> @@ -151,13 +153,14 @@ void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address,
>> id = srcu_read_lock(&srcu);
>> hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
>> if (mn->ops->change_pte)
>> - mn->ops->change_pte(mn, mm, address, pte);
>> + mn->ops->change_pte(mn, mm, address, pte, event);
>> }
>> srcu_read_unlock(&srcu, id);
>> }
>>
>> void __mmu_notifier_invalidate_page(struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> struct mmu_notifier *mn;
>> int id;
>> @@ -165,13 +168,16 @@ void __mmu_notifier_invalidate_page(struct mm_struct *mm,
>> id = srcu_read_lock(&srcu);
>> hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
>> if (mn->ops->invalidate_page)
>> - mn->ops->invalidate_page(mn, mm, address);
>> + mn->ops->invalidate_page(mn, mm, address, event);
>> }
>> srcu_read_unlock(&srcu, id);
>> }
>>
>> void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> +
>> {
>> struct mmu_notifier *mn;
>> int id;
>> @@ -179,14 +185,17 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
>> id = srcu_read_lock(&srcu);
>> hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
>> if (mn->ops->invalidate_range_start)
>> - mn->ops->invalidate_range_start(mn, mm, start, end);
>> + mn->ops->invalidate_range_start(mn, mm, start,
>> + end, event);
>> }
>> srcu_read_unlock(&srcu, id);
>> }
>> EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);
>>
>> void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
>> - unsigned long start, unsigned long end)
>> + unsigned long start,
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct mmu_notifier *mn;
>> int id;
>> @@ -204,7 +213,8 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
>> if (mn->ops->invalidate_range)
>> mn->ops->invalidate_range(mn, mm, start, end);
>> if (mn->ops->invalidate_range_end)
>> - mn->ops->invalidate_range_end(mn, mm, start, end);
>> + mn->ops->invalidate_range_end(mn, mm, start,
>> + end, event);
>> }
>> srcu_read_unlock(&srcu, id);
>> }
>> diff --git a/mm/mprotect.c b/mm/mprotect.c
>> index ace9345..0f5dbfe 100644
>> --- a/mm/mprotect.c
>> +++ b/mm/mprotect.c
>> @@ -152,7 +152,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
>> /* invoke the mmu notifier if the pmd is populated */
>> if (!mni_start) {
>> mni_start = addr;
>> - mmu_notifier_invalidate_range_start(mm, mni_start, end);
>> + mmu_notifier_invalidate_range_start(mm, mni_start,
>> + end, MMU_MPROT);
>> }
>>
>> if (pmd_trans_huge(*pmd)) {
>> @@ -180,7 +181,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
>> } while (pmd++, addr = next, addr != end);
>>
>> if (mni_start)
>> - mmu_notifier_invalidate_range_end(mm, mni_start, end);
>> + mmu_notifier_invalidate_range_end(mm, mni_start, end,
>> + MMU_MPROT);
>>
>> if (nr_huge_updates)
>> count_vm_numa_events(NUMA_HUGE_PTE_UPDATES, nr_huge_updates);
>> diff --git a/mm/mremap.c b/mm/mremap.c
>> index 17fa018..1ede220 100644
>> --- a/mm/mremap.c
>> +++ b/mm/mremap.c
>> @@ -177,7 +177,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
>>
>> mmun_start = old_addr;
>> mmun_end = old_end;
>> - mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> for (; old_addr < old_end; old_addr += extent, new_addr += extent) {
>> cond_resched();
>> @@ -229,7 +230,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
>> if (likely(need_flush))
>> flush_tlb_range(vma, old_end-len, old_addr);
>>
>> - mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start,
>> + mmun_end, MMU_MIGRATE);
>>
>> return len + old_addr - old_end; /* how much done */
>> }
>> diff --git a/mm/rmap.c b/mm/rmap.c
>> index b404783..1d96644 100644
>> --- a/mm/rmap.c
>> +++ b/mm/rmap.c
>> @@ -869,7 +869,7 @@ static int page_mkclean_one(struct page *page, struct vm_area_struct *vma,
>> pte_unmap_unlock(pte, ptl);
>>
>> if (ret) {
>> - mmu_notifier_invalidate_page(mm, address);
>> + mmu_notifier_invalidate_page(mm, address, MMU_WRITE_BACK);
>> (*cleaned)++;
>> }
>> out:
>> @@ -1171,8 +1171,12 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
>> spinlock_t *ptl;
>> int ret = SWAP_AGAIN;
>> enum ttu_flags flags = (enum ttu_flags)arg;
>> + enum mmu_event event = MMU_MIGRATE;
>> int dirty = 0;
>>
>> + if (flags & TTU_MUNLOCK)
>> + event = MMU_MUNLOCK;
>> +
>> pte = page_check_address(page, mm, address, &ptl, 0);
>> if (!pte)
>> goto out;
>> @@ -1292,7 +1296,7 @@ discard:
>> out_unmap:
>> pte_unmap_unlock(pte, ptl);
>> if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK))
>> - mmu_notifier_invalidate_page(mm, address);
>> + mmu_notifier_invalidate_page(mm, address, event);
>> out:
>> return ret;
>>
>> @@ -1346,7 +1350,9 @@ out_mlock:
>> #define CLUSTER_MASK (~(CLUSTER_SIZE - 1))
>>
>> static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
>> - struct vm_area_struct *vma, struct page *check_page)
>> + struct vm_area_struct *vma,
>> + struct page *check_page,
>> + enum ttu_flags flags)
>> {
>> struct mm_struct *mm = vma->vm_mm;
>> pmd_t *pmd;
>> @@ -1360,6 +1366,10 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
>> unsigned long end;
>> int ret = SWAP_AGAIN;
>> int locked_vma = 0;
>> + enum mmu_event event = MMU_MIGRATE;
>> +
>> + if (flags & TTU_MUNLOCK)
>> + event = MMU_MUNLOCK;
>>
>> address = (vma->vm_start + cursor) & CLUSTER_MASK;
>> end = address + CLUSTER_SIZE;
>> @@ -1374,7 +1384,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
>>
>> mmun_start = address;
>> mmun_end = end;
>> - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end, event);
>>
>> /*
>> * If we can acquire the mmap_sem for read, and vma is VM_LOCKED,
>> @@ -1443,7 +1453,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
>> (*mapcount)--;
>> }
>> pte_unmap_unlock(pte - 1, ptl);
>> - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
>> + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end, event);
>> if (locked_vma)
>> up_read(&vma->vm_mm->mmap_sem);
>> return ret;
>> @@ -1499,7 +1509,9 @@ static int try_to_unmap_nonlinear(struct page *page,
>> while (cursor < max_nl_cursor &&
>> cursor < vma->vm_end - vma->vm_start) {
>> if (try_to_unmap_cluster(cursor, &mapcount,
>> - vma, page) == SWAP_MLOCK)
>> + vma, page,
>> + (enum ttu_flags)arg)
>> + == SWAP_MLOCK)
>> ret = SWAP_MLOCK;
>> cursor += CLUSTER_SIZE;
>> vma->vm_private_data = (void *) cursor;
>> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
>> index 1cc6e2e..bee9357 100644
>> --- a/virt/kvm/kvm_main.c
>> +++ b/virt/kvm/kvm_main.c
>> @@ -254,7 +254,8 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
>>
>> static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> - unsigned long address)
>> + unsigned long address,
>> + enum mmu_event event)
>> {
>> struct kvm *kvm = mmu_notifier_to_kvm(mn);
>> int need_tlb_flush, idx;
>> @@ -296,7 +297,8 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
>> static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long address,
>> - pte_t pte)
>> + pte_t pte,
>> + enum mmu_event event)
>> {
>> struct kvm *kvm = mmu_notifier_to_kvm(mn);
>> int idx;
>> @@ -312,7 +314,8 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
>> static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct kvm *kvm = mmu_notifier_to_kvm(mn);
>> int need_tlb_flush = 0, idx;
>> @@ -338,7 +341,8 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
>> static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
>> struct mm_struct *mm,
>> unsigned long start,
>> - unsigned long end)
>> + unsigned long end,
>> + enum mmu_event event)
>> {
>> struct kvm *kvm = mmu_notifier_to_kvm(mn);
>>
>>
>
> Hi Jerome,
>
> I have a question:
> Don't you need to add the "enum mmu_event event" to the new
> __mmu_notifier_invalidate_range() and to (*invalidate_range)() as well ?
>
> Those new functions were merged to 3.19.
>
> Oded
To elaborate, I know the new mmu_notifier_invalidate_range is for non-CPU
TLB flush, so a fine-grained event may not be necessary. However, a
subsystem might still use it instead of start/end (the patch inserts a call
to mn->ops->invalidate_range in __mmu_notifier_invalidate_range_end() so
that option will work). In addition, maybe in the future we will want to
distinguish between, let's say, migration and dirty events for non-CPU TLB ?
Oded
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