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On 2019/3/8 ??5:27, Andrea Arcangeli wrote: > Hello Jerome, > > On Thu, Mar 07, 2019 at 03:17:22PM -0500, Jerome Glisse wrote: >> So for the above the easiest thing is to call set_page_dirty() from >> the mmu notifier callback. It is always safe to use the non locking >> variant from such callback. Well it is safe only if the page was >> map with write permission

On 2019/3/8 ??5:27, Andrea Arcangeli wrote: > Hello Jerome, > > On Thu, Mar 07, 2019 at 03:17:22PM -0500, Jerome Glisse wrote: >> So for the above the easiest thing is to call set_page_dirty() from >> the mmu notifier callback. It is always safe to use the non locking >> variant from such callback. Well it is safe only if the page was >> map with write permission

...in things like KSM, or the pin must be released in invalidate_range_start (which is called before the pin checks). Here's why: /* * Check that no O_DIRECT or similar I/O is in progress on the * page */ if (page_mapcount(page) + 1 + swapped != page_count(page)) { set_pte_at(mm, pvmw.address, pvmw.pte, entry); goto out_unlock; } [..] set_pte_at_notify(mm, pvmw.address, pvmw.pte, entry); ^^^^^^^ too late release the pin here, the above already failed ->invalidate_range cannot be used with mutex anyway so you need to go back with invalidate_range_start/end...

...{ ds_queue->split_queue_len--; - list_del(page_deferred_list(page)); + list_del_init(page_deferred_list(page)); } spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); free_compound_page(page); @@ -2963,6 +2975,10 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) pmde = pmd_mksoft_dirty(pmde); if (is_write_migration_entry(entry)) pmde = maybe_pmd_mkwrite(pmde, vma); + if (unlikely(is_device_private_page(new))) { + entry = make_device_private_entry(new, pmd_write(pmde)); + pmde = swp_entry_to_pmd(entry); + } flush_cache_range...

..._len--; > - list_del(page_deferred_list(page)); > + list_del_init(page_deferred_list(page)); > } > spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); > free_compound_page(page); > @@ -2963,6 +2975,10 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) > pmde = pmd_mksoft_dirty(pmde); > if (is_write_migration_entry(entry)) > pmde = maybe_pmd_mkwrite(pmde, vma); > + if (unlikely(is_device_private_page(new))) { > + entry = make_device_private_entry(new, pmd_write(pmde)); > + pmde = swp_entry_to_pmd(ent...

...ge_deferred_list(page)); + list_del_init(page_deferred_list(page)); } spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); + if (is_device_private_page(page)) + return; free_compound_page(page); } @@ -2986,6 +3058,10 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) pmde = pmd_mksoft_dirty(pmde); if (is_write_migration_entry(entry)) pmde = maybe_pmd_mkwrite(pmde, vma); + if (unlikely(is_device_private_page(new))) { + entry = make_device_private_entry(new, pmd_write(pmde)); + pmde = swp_entry_to_pmd(entry); + } flush_cache_range...

...ed/mm.h> #include <linux/ptrace.h> +#include <linux/remote_mapping.h> #include <asm/tlbflush.h> @@ -215,7 +216,7 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma, VM_BUG_ON_PAGE(PageTail(page), page); while (page_vma_mapped_walk(&pvmw)) { - if (PageKsm(page)) + if (PageKsm(page) || PageRemote(page)) new = page; else new = page - pvmw.page->index + @@ -1065,7 +1066,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage, * because that implies that the anon page is no longer mapped * (and ca...

These patches apply to linux-5.8.0-rc1. Patches 1-3 should probably go into 5.8, the others can be queued for 5.9. Patches 4-6 improve the HMM self tests. Patch 7-8 prepare nouveau for the meat of this series which adds support and testing for compound page mapping of system memory (patches 9-11) and compound page migration to device private memory (patches 12-16). Since these changes are split

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. Earlier versions were posted previously [1] and [2]. The patches apply cleanly to the linux-mm 5.10.0-rc2 tree. There are a lot of other THP patches being posted. I don't think there are any semantic conflicts but there may be some merge conflicts depending on

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. An earlier version was posted previously [1]. This version now supports splitting a THP midway in the migration process which led to a number of changes. The patches apply cleanly to the current linux-mm tree. Since there are a couple of patches in linux-mm from Dan

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place