RE: [PATCH v5 06/11] iommu/vt-d: Set the nested domain to a device

From: Liu, Yi L yi.l.liu@intel.com Sent: Thursday, September 21, 2023 3:54 PM

• /* Is s2_domain compatible with this IOMMU? */

Add more words on why prepare_attach uses s2_domain when the actual attach is for s1

• ret = prepare_domain_attach_device(&dmar_domain->s2_domain-

...

domain, dev);

• if (ret) {

• dev_err_ratelimited(dev, "s2 domain is not compatible\n");
  

• return ret;
  

• }
• ret = domain_attach_iommu(dmar_domain, iommu);
• if (ret) {

• dev_err_ratelimited(dev, "Failed to attach domain to
  

iommu\n");

• return ret;
  

• }