[2/7] vfio: iommu_type1: Initially set the pinned_page_dirty_scope

Commit Message

zhukeqian Dec. 10, 2020, 7:34 a.m. UTC

Currently there are 3 ways to promote the pinned_page_dirty_scope
status of vfio_iommu:

1. Through pin interface.
2. Detach a group without dirty tracking.
3. Attach a group with dirty tracking.

For point 3, the only chance to change the pinned status is that
the vfio_iommu is newly created.

Consider that we can safely set the pinned status when create a
new vfio_iommu, as we do it, the point 3 can be removed to reduce
operations.

Signed-off-by: Keqian Zhu <[e-mail]>
---
 drivers/vfio/vfio_iommu_type1.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

Patch

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index f129d24a6ec3..c52bcefba96b 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2064,12 +2064,8 @@  static int vfio_iommu_type1_attach_group(void *iommu_data,
 			 * Non-iommu backed group cannot dirty memory directly,
 			 * it can only use interfaces that provide dirty
 			 * tracking.
-			 * The iommu scope can only be promoted with the
-			 * addition of a dirty tracking group.
 			 */
 			group->pinned_page_dirty_scope = true;
-			if (!iommu->pinned_page_dirty_scope)
-				update_pinned_page_dirty_scope(iommu);
 			mutex_unlock(&iommu->lock);
 
 			return 0;
@@ -2457,6 +2453,7 @@  static void *vfio_iommu_type1_open(unsigned long arg)
 	INIT_LIST_HEAD(&iommu->iova_list);
 	iommu->dma_list = RB_ROOT;
 	iommu->dma_avail = dma_entry_limit;
+	iommu->pinned_page_dirty_scope = true;
 	mutex_init(&iommu->lock);
 	BLOCKING_INIT_NOTIFIER_HEAD(&iommu->notifier);