For SMMUv3 the parent must be a S2 domain, which can be composed
into a IOMMU_DOMAIN_NESTED.
In future the S2 parent will also need a VMID linked to the VIOMMU and
even to KVM.
Reviewed-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Tested-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 996774d461aea2..80847fa386fcd2 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3114,7 +3114,8 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
const struct iommu_user_data *user_data)
{
struct arm_smmu_master *master = dev_iommu_priv_get(dev);
- const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
+ const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING |
+ IOMMU_HWPT_ALLOC_NEST_PARENT;
struct arm_smmu_domain *smmu_domain;
int ret;
@@ -3127,6 +3128,14 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
if (IS_ERR(smmu_domain))
return ERR_CAST(smmu_domain);
+ if (flags & IOMMU_HWPT_ALLOC_NEST_PARENT) {
+ if (!(master->smmu->features & ARM_SMMU_FEAT_NESTING)) {
+ ret = -EOPNOTSUPP;
+ goto err_free;
+ }
+ smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
+ }
+
smmu_domain->domain.type = IOMMU_DOMAIN_UNMANAGED;
smmu_domain->domain.ops = arm_smmu_ops.default_domain_ops;
ret = arm_smmu_domain_finalise(smmu_domain, master->smmu, flags);
--
2.46.2
