On 11/27/2023 2:34 PM, Yi Liu wrote:
From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
This allows the upper layers to set a nested type domain to a PASID of a
device if the PASID feature is supported by the IOMMU hardware.
The set_dev_pasid callback for non-nest domain has already be there, so
this only needs to add it for nested domains.
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
drivers/iommu/intel/nested.c | 47 ++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index 44ad48db7ea0..f6f687750104 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -68,6 +68,52 @@ static int intel_nested_attach_dev(struct iommu_domain *domain,
return 0;
}
+static int intel_nested_set_dev_pasid(struct iommu_domain *domain,
+ struct device *dev, ioasid_t pasid)
+{
+ struct device_domain_info *info = dev_iommu_priv_get(dev);
+ struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+ struct intel_iommu *iommu = info->iommu;
+ struct dev_pasid_info *dev_pasid;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!pasid_supported(iommu))
+ return -EOPNOTSUPP;
+
+ if (iommu->agaw < dmar_domain->s2_domain->agaw)
+ return -EINVAL;
+
+ ret = prepare_domain_attach_device(&dmar_domain->s2_domain->domain, dev);
+ if (ret)
+ return ret;
+
+ dev_pasid = kzalloc(sizeof(*dev_pasid), GFP_KERNEL);
+ if (!dev_pasid)
+ return -ENOMEM;
+
+ ret = domain_attach_iommu(dmar_domain, iommu);
+ if (ret)
+ goto err_free;
+
+ ret = intel_pasid_setup_nested(iommu, dev, pasid, dmar_domain);
+ if (ret)
+ goto err_detach_iommu;
+
+ dev_pasid->dev = dev;
+ dev_pasid->pasid = pasid;
+ spin_lock_irqsave(&dmar_domain->lock, flags);
+ list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
+ spin_unlock_irqrestore(&dmar_domain->lock, flags);
---> list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
dev_pasid is linked at later time, this leads to domain->has_iotlb_device is not correctly set, which finally results into a missing of device iotlb flush in iommu_flush_dev_iotlb()when it's called.
Check this call path:
domain_attach_iommu()->domain_update_iommu_cap()->domain_update_iotlb()->domain->has_iotlb_device = has_iotlb_device; The ugly fixup is to call domain_update_iommu_cap() or domain_update_iotlb() here again before return.
The similar issue is in intel_iommu_set_dev_pasid() and intel_nested_attach_dev().
+
+ return 0;
+err_detach_iommu:
+ domain_detach_iommu(dmar_domain, iommu);
+err_free:
+ kfree(dev_pasid);
+ return ret;
+}
+
static void intel_nested_domain_free(struct iommu_domain *domain)
{
kfree(to_dmar_domain(domain));
@@ -128,6 +174,7 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
static const struct iommu_domain_ops intel_nested_domain_ops = {
.attach_dev = intel_nested_attach_dev,
+ .set_dev_pasid = intel_nested_set_dev_pasid,
.free = intel_nested_domain_free,
.cache_invalidate_user = intel_nested_cache_invalidate_user,
};
