For now there are 3 ways to promote the pinned_page_dirty_scope status of vfio_iommu:
1. Through vfio pin interface. 2. Detach a group without pinned_dirty_scope. 3. Attach a group with pinned_dirty_scope. For point 3, the only chance to promote the pinned_page_dirty_scope status is when vfio_iommu is newly created. As we can safely set empty vfio_iommu to be at pinned status, then the point 3 can be removed to reduce operations. Signed-off-by: Keqian Zhu <[email protected]> --- drivers/vfio/vfio_iommu_type1.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 110ada24ee91..b596c482487b 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2045,11 +2045,8 @@ 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; - promote_pinned_page_dirty_scope(iommu); mutex_unlock(&iommu->lock); return 0; @@ -2436,6 +2433,7 @@ 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); -- 2.19.1
