[PATCH v2 02/27] iommu/arm-smmu-v3: Do not allow a SVA domain to be set on the wrong PASID

[Jason Gunthorpe]

The SVA code is wired to assume that the SVA is programmed onto the
mm->pasid. The current core code always does this, so it is fine.

Add a check for clarity.

Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index bd0566381c58a9..ee3d148aafa26b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -585,6 +585,9 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 	int ret = 0;
 	struct mm_struct *mm = domain->mm;
 
+	if (mm->pasid != id)
+		return -EINVAL;
+
 	mutex_lock(&sva_lock);
 	ret = __arm_smmu_sva_bind(dev, mm);
 	mutex_unlock(&sva_lock);
-- 
2.42.0