Messages in this thread Patch in this message |  | | From | Ralph Campbell <> | Subject | [PATCH 3/3] mm/migrate: add stable check in migrate_vma_insert_page() | Date | Tue, 7 Jan 2020 13:12:08 -0800 |
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migrate_vma_insert_page() closely follows the code in: __handle_mm_fault() handle_pte_fault() do_anonymous_page()
Add a call to check_stable_address_space() after locking the page table entry before inserting a ZONE_DEVICE private zero page mapping similar to page faulting a new anonymous page.
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com> --- mm/migrate.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/mm/migrate.c b/mm/migrate.c index 4b1a6d69afb5..403b82472d24 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -48,6 +48,7 @@ #include <linux/page_owner.h> #include <linux/sched/mm.h> #include <linux/ptrace.h> +#include <linux/oom.h> #include <asm/tlbflush.h> @@ -2675,6 +2676,14 @@ int migrate_vma_setup(struct migrate_vma *args) } EXPORT_SYMBOL(migrate_vma_setup); +/* + * This code closely matches the code in: + * __handle_mm_fault() + * handle_pte_fault() + * do_anonymous_page() + * to map in an anonymous zero page but the struct page will be a ZONE_DEVICE + * private page. + */ static void migrate_vma_insert_page(struct migrate_vma *migrate, unsigned long addr, struct page *page, @@ -2755,6 +2764,9 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl); + if (check_stable_address_space(mm)) + goto unlock_abort; + if (pte_present(*ptep)) { unsigned long pfn = pte_pfn(*ptep); -- 2.20.1
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