search for: b1092876e537

...grating out of device private memory. If set only device + * private pages with this owner are migrated. If not set + * device private pages are not migrated at all. + */ + void *src_owner; }; int migrate_vma_setup(struct migrate_vma *args); diff --git a/mm/migrate.c b/mm/migrate.c index b1092876e537..7605d2c23433 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2241,7 +2241,7 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp, arch_enter_lazy_mmu_mode(); for (; addr < end; addr += PAGE_SIZE, ptep++) { - unsigned long mpfn, pfn; + unsigned long mpfn = 0, pfn; struct page *page;...

...include/linux/migrate.h +++ b/include/linux/migrate.h @@ -196,6 +196,8 @@ struct migrate_vma { unsigned long npages; unsigned long start; unsigned long end; + + void *dev_private_owner; }; int migrate_vma_setup(struct migrate_vma *args); diff --git a/mm/migrate.c b/mm/migrate.c index b1092876e537..201e8fa627e0 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2267,6 +2267,9 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp, goto next; page = device_private_entry_to_page(entry); + if (page->pgmap->owner != migrate->dev_private_owner) + goto next; + mpfn = migrate_...

When acting on device private mappings a driver needs to know if the device (or other entity in case of kvmppc) actually owns this private mapping. This series adds an owner field and converts the migrate_vma code over to check it. I looked into doing the same for hmm_range_fault, but as far as I can tell that code has never been wired up to actually work for device private memory, so instead of

When acting on device private mappings a driver needs to know if the device (or other entity in case of kvmppc) actually owns this private mapping. This series adds an owner field and converts the migrate_vma code over to check it. I looked into doing the same for hmm_range_fault, but as far as I can tell that code has never been wired up to actually work for device private memory, so instead of