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Date:   Tue, 26 Mar 2019 12:47:45 -0400
From:   jglisse@...hat.com
To:     linux-kernel@...r.kernel.org
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Christian König <christian.koenig@....com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>, Jan Kara <jack@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>, kvm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v6 6/8] mm/mmu_notifier: use correct mmu_notifier events for each invalidation

From: Jérôme Glisse <jglisse@...hat.com>

This update each existing invalidation to use the correct mmu notifier
event that represent what is happening to the CPU page table. See the
patch which introduced the events to see the rational behind this.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: Christian König <christian.koenig@....com>
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Peter Xu <peterx@...hat.com>
Cc: Felix Kuehling <Felix.Kuehling@....com>
Cc: Jason Gunthorpe <jgg@...lanox.com>
Cc: Ross Zwisler <zwisler@...nel.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Christian Koenig <christian.koenig@....com>
Cc: Ralph Campbell <rcampbell@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: kvm@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-rdma@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
---
 fs/proc/task_mmu.c      |  4 ++--
 kernel/events/uprobes.c |  2 +-
 mm/huge_memory.c        | 14 ++++++--------
 mm/hugetlb.c            |  8 ++++----
 mm/khugepaged.c         |  2 +-
 mm/ksm.c                |  4 ++--
 mm/madvise.c            |  2 +-
 mm/memory.c             | 14 +++++++-------
 mm/migrate.c            |  4 ++--
 mm/mprotect.c           |  5 +++--
 mm/rmap.c               |  6 +++---
 11 files changed, 32 insertions(+), 33 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index fcbd0e574917..3b93ce496dd4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1151,8 +1151,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
 				break;
 			}
 
-			mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0,
-						NULL, mm, 0, -1UL);
+			mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY,
+						0, NULL, mm, 0, -1UL);
 			mmu_notifier_invalidate_range_start(&range);
 		}
 		walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 77c3f079c723..79c84bb48ea9 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -161,7 +161,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
 	struct mmu_notifier_range range;
 	struct mem_cgroup *memcg;
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm, addr,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr,
 				addr + PAGE_SIZE);
 
 	VM_BUG_ON_PAGE(PageTransHuge(old_page), old_page);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4309939be22d..f0ad70c29500 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1184,9 +1184,8 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf,
 		cond_resched();
 	}
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
-				haddr,
-				haddr + HPAGE_PMD_SIZE);
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
+				haddr, haddr + HPAGE_PMD_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
 
 	vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
@@ -1349,9 +1348,8 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
 				    vma, HPAGE_PMD_NR);
 	__SetPageUptodate(new_page);
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
-				haddr,
-				haddr + HPAGE_PMD_SIZE);
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
+				haddr, haddr + HPAGE_PMD_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
 
 	spin_lock(vmf->ptl);
@@ -2026,7 +2024,7 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
 	spinlock_t *ptl;
 	struct mmu_notifier_range range;
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
 				address & HPAGE_PUD_MASK,
 				(address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
@@ -2245,7 +2243,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 	spinlock_t *ptl;
 	struct mmu_notifier_range range;
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
 				address & HPAGE_PMD_MASK,
 				(address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c20a8d2de3f3..44fe3565ef37 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3247,7 +3247,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
 	cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
 
 	if (cow) {
-		mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, src,
+		mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, src,
 					vma->vm_start,
 					vma->vm_end);
 		mmu_notifier_invalidate_range_start(&range);
@@ -3628,7 +3628,7 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
 			    pages_per_huge_page(h));
 	__SetPageUptodate(new_page);
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm, haddr,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, haddr,
 				haddr + huge_page_size(h));
 	mmu_notifier_invalidate_range_start(&range);
 
@@ -4361,8 +4361,8 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 	 * start/end.  Set range.start/range.end to cover the maximum possible
 	 * range if PMD sharing is possible.
 	 */
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm, start,
-				end);
+	mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA,
+				0, vma, mm, start, end);
 	adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end);
 
 	BUG_ON(address >= end);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e7944f5e6258..579699d2b347 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1016,7 +1016,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 	pte = pte_offset_map(pmd, address);
 	pte_ptl = pte_lockptr(mm, pmd);
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, NULL, mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm,
 				address, address + HPAGE_PMD_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
 	pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */
diff --git a/mm/ksm.c b/mm/ksm.c
index 01f5fe2c90cf..81c20ed57bf6 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1066,7 +1066,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
 
 	BUG_ON(PageTransCompound(page));
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
 				pvmw.address,
 				pvmw.address + PAGE_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
@@ -1155,7 +1155,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
 	if (!pmd)
 		goto out;
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm, addr,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr,
 				addr + PAGE_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
 
diff --git a/mm/madvise.c b/mm/madvise.c
index c617f53a9c09..a692d2a893b5 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -472,7 +472,7 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
 	range.end = min(vma->vm_end, end_addr);
 	if (range.end <= vma->vm_start)
 		return -EINVAL;
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
 				range.start, range.end);
 
 	lru_add_drain();
diff --git a/mm/memory.c b/mm/memory.c
index ac6754bb30c8..c24c5ffe950f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1010,8 +1010,8 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 	is_cow = is_cow_mapping(vma->vm_flags);
 
 	if (is_cow) {
-		mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma,
-					src_mm, addr, end);
+		mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE,
+					0, vma, src_mm, addr, end);
 		mmu_notifier_invalidate_range_start(&range);
 	}
 
@@ -1358,7 +1358,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
 	struct mmu_gather tlb;
 
 	lru_add_drain();
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
 				start, start + size);
 	tlb_gather_mmu(&tlb, vma->vm_mm, start, range.end);
 	update_hiwater_rss(vma->vm_mm);
@@ -1385,7 +1385,7 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr
 	struct mmu_gather tlb;
 
 	lru_add_drain();
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
 				address, address + size);
 	tlb_gather_mmu(&tlb, vma->vm_mm, address, range.end);
 	update_hiwater_rss(vma->vm_mm);
@@ -2282,7 +2282,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 
 	__SetPageUptodate(new_page);
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
 				vmf->address & PAGE_MASK,
 				(vmf->address & PAGE_MASK) + PAGE_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
@@ -4108,7 +4108,7 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
 			goto out;
 
 		if (range) {
-			mmu_notifier_range_init(range, MMU_NOTIFY_UNMAP, 0,
+			mmu_notifier_range_init(range, MMU_NOTIFY_CLEAR, 0,
 						NULL, mm, address & PMD_MASK,
 						(address & PMD_MASK) + PMD_SIZE);
 			mmu_notifier_invalidate_range_start(range);
@@ -4127,7 +4127,7 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
 		goto out;
 
 	if (range) {
-		mmu_notifier_range_init(range, MMU_NOTIFY_UNMAP, 0, NULL, mm,
+		mmu_notifier_range_init(range, MMU_NOTIFY_CLEAR, 0, NULL, mm,
 					address & PAGE_MASK,
 					(address & PAGE_MASK) + PAGE_SIZE);
 		mmu_notifier_invalidate_range_start(range);
diff --git a/mm/migrate.c b/mm/migrate.c
index 8f6e4382f0ad..f37b1a4bf9c0 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2351,7 +2351,7 @@ static void migrate_vma_collect(struct migrate_vma *migrate)
 	mm_walk.mm = migrate->vma->vm_mm;
 	mm_walk.private = migrate;
 
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, NULL, mm_walk.mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm_walk.mm,
 				migrate->start,
 				migrate->end);
 	mmu_notifier_invalidate_range_start(&range);
@@ -2760,7 +2760,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
 				notified = true;
 
 				mmu_notifier_range_init(&range,
-							MMU_NOTIFY_UNMAP, 0,
+							MMU_NOTIFY_CLEAR, 0,
 							NULL,
 							migrate->vma->vm_mm,
 							addr, migrate->end);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index b10984052ae9..65242f1e4457 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -185,8 +185,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
 
 		/* invoke the mmu notifier if the pmd is populated */
 		if (!range.start) {
-			mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0,
-						vma, vma->vm_mm, addr, end);
+			mmu_notifier_range_init(&range,
+				MMU_NOTIFY_PROTECTION_VMA, 0,
+				vma, vma->vm_mm, addr, end);
 			mmu_notifier_invalidate_range_start(&range);
 		}
 
diff --git a/mm/rmap.c b/mm/rmap.c
index dba724f83ddd..c26becc3982c 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -896,8 +896,8 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
 	 * We have to assume the worse case ie pmd for invalidation. Note that
 	 * the page can not be free from this function.
 	 */
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
-				address,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE,
+				0, vma, vma->vm_mm, address,
 				min(vma->vm_end, address +
 				    (PAGE_SIZE << compound_order(page))));
 	mmu_notifier_invalidate_range_start(&range);
@@ -1372,7 +1372,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 	 * Note that the page can not be free in this function as call of
 	 * try_to_unmap() must hold a reference on the page.
 	 */
-	mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
+	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
 				address,
 				min(vma->vm_end, address +
 				    (PAGE_SIZE << compound_order(page))));
-- 
2.20.1

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