On 9/19/2023 5:25 PM, Yi Liu wrote:
This adds the domain_alloc_user op implementation. It supports allocating
domains to be used as parent under nested translation.
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
drivers/iommu/intel/iommu.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 5db283c17e0d..491bcde1ff96 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4074,6 +4074,25 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
return NULL;
}
+static struct iommu_domain *
+intel_iommu_domain_alloc_user(struct device *dev, u32 flags)
+{
+ struct iommu_domain *domain;
+ struct intel_iommu *iommu;
+
+ iommu = device_to_iommu(dev, NULL, NULL);
+ if (!iommu)
+ return ERR_PTR(-ENODEV);
+
+ if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ecap_nest(iommu->ecap))
+ return ERR_PTR(-EOPNOTSUPP);
The outer caller has checked (flags & IOMMU_HWPT_ALLOC_NEST_PARENT) before it comes here.
If this callback is dedicated for nested domain allocation, then you may omit the condition here.
