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

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
> 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;
> +	}
> +