[PATCH 1/1] iommu/vt-d: Assign owner to the static identity domain

[Lu Baolu <baolu.lu@linux.intel.com>]

The idxd driver attaches the default domain to a PASID of the device to
perform kernel DMA using that PASID. The domain is attached to the
device's PASID through iommu_attach_device_pasid(), which checks if the
domain->owner matches the iommu_ops retrieved from the device. If they
do not match, it returns a failure.

        if (ops != domain->owner || pasid == IOMMU_NO_PASID)
                return -EINVAL;

The static identity domain implemented by the intel iommu driver doesn't
specify the domain owner. Therefore, kernel DMA with PASID doesn't work
for the idxd driver if the device translation mode is set to passthrough.

Fix this by specifying the domain owner for the static identity domain.

Fixes: 2031c469f816 ("iommu/vt-d: Add support for static identity domain")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220031
Cc: stable@vger.kernel.org
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/intel/iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index cb0b993bebb4..63c9c97ccf69 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4385,6 +4385,7 @@ static struct iommu_domain identity_domain = {
 		.attach_dev	= identity_domain_attach_dev,
 		.set_dev_pasid	= identity_domain_set_dev_pasid,
 	},
+	.owner = &intel_iommu_ops,
 };
 
 const struct iommu_ops intel_iommu_ops = {
-- 
2.43.0