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[v2,13/14] vfio_iommu_type1: specify FOLL_HINT_BULK to pin_user_pages()

Message ID 20211020185207.18509-1-ankur.a.arora@oracle.com (mailing list archive)
State New
Headers show
Series Use uncached stores while clearing huge pages | expand

Commit Message

Ankur Arora Oct. 20, 2021, 6:52 p.m. UTC 
Specify FOLL_HINT_BULK to pin_user_pages() so it is aware that
this pin is part of a larger region being pinned, so it can
optimize based on that expectation.

Cc: alex.williamson@redhat.com
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
 drivers/vfio/vfio_iommu_type1.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0e9217687f5c..0d45b0c6464d 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -557,6 +557,9 @@  static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
 	if (prot & IOMMU_WRITE)
 		flags |= FOLL_WRITE;
 
+	/* Tell gup that this iterations is part of larger set of pins. */
+	flags |= FOLL_HINT_BULK;
+
 	mmap_read_lock(mm);
 	ret = pin_user_pages_remote(mm, vaddr, npages, flags | FOLL_LONGTERM,
 				    pages, NULL, NULL);