[PATCH v2 12/17] vfio: Set DMA USER ownership for VFIO devices

[Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>]

Set DMA_OWNER_PRIVATE_DOMAIN_USER when an iommu group is set to a
container, and release DMA_OWNER_USER once the iommu group is unset
from a container.

Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/vfio/fsl-mc/vfio_fsl_mc.c     |  1 +
 drivers/vfio/pci/vfio_pci.c           |  1 +
 drivers/vfio/platform/vfio_amba.c     |  1 +
 drivers/vfio/platform/vfio_platform.c |  1 +
 drivers/vfio/vfio.c                   | 13 ++++++++++++-
 5 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 6e2e62c6f47a..5f36ffbb07d1 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -588,6 +588,7 @@ static struct fsl_mc_driver vfio_fsl_mc_driver = {
 		.name	= "vfio-fsl-mc",
 		.owner	= THIS_MODULE,
 	},
+	.suppress_auto_claim_dma_owner = true,
 };
 
 static int __init vfio_fsl_mc_driver_init(void)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index a5ce92beb655..31810b074aa4 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -193,6 +193,7 @@ static struct pci_driver vfio_pci_driver = {
 	.remove			= vfio_pci_remove,
 	.sriov_configure	= vfio_pci_sriov_configure,
 	.err_handler		= &vfio_pci_core_err_handlers,
+	.suppress_auto_claim_dma_owner = true,
 };
 
 static void __init vfio_pci_fill_ids(void)
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index badfffea14fb..e598d6af90ad 100644
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -95,6 +95,7 @@ static struct amba_driver vfio_amba_driver = {
 		.name = "vfio-amba",
 		.owner = THIS_MODULE,
 	},
+	.suppress_auto_claim_dma_owner = true,
 };
 
 module_amba_driver(vfio_amba_driver);
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 68a1c87066d7..8bda68775b97 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -76,6 +76,7 @@ static struct platform_driver vfio_platform_driver = {
 	.driver	= {
 		.name	= "vfio-platform",
 	},
+	.suppress_auto_claim_dma_owner = true,
 };
 
 module_platform_driver(vfio_platform_driver);
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 82fb75464f92..00f89acfec39 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1198,6 +1198,9 @@ static void __vfio_group_unset_container(struct vfio_group *group)
 		driver->ops->detach_group(container->iommu_data,
 					  group->iommu_group);
 
+	iommu_group_release_dma_owner(group->iommu_group,
+				      DMA_OWNER_PRIVATE_DOMAIN_USER);
+
 	group->container = NULL;
 	wake_up(&group->container_q);
 	list_del(&group->container_next);
@@ -1282,13 +1285,21 @@ static int vfio_group_set_container(struct vfio_group *group, int container_fd)
 		goto unlock_out;
 	}
 
+	ret = iommu_group_set_dma_owner(group->iommu_group,
+					DMA_OWNER_PRIVATE_DOMAIN_USER, f.file);
+	if (ret)
+		goto unlock_out;
+
 	driver = container->iommu_driver;
 	if (driver) {
 		ret = driver->ops->attach_group(container->iommu_data,
 						group->iommu_group,
 						group->type);
-		if (ret)
+		if (ret) {
+			iommu_group_release_dma_owner(group->iommu_group,
+						      DMA_OWNER_PRIVATE_DOMAIN_USER);
 			goto unlock_out;
+		}
 	}
 
 	group->container = container;
-- 
2.25.1