linux-kernel - Re: [RFC PATCH v2 07/10] iommu/riscv: support nested iommu for creating domains owned by userspace

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Message-ID: <d003f916-28ca-451a-a2e1-e58c66fc3459@oracle.com>
Date: Wed, 19 Jun 2024 17:34:02 +0100
From: Joao Martins <joao.m.martins@...cle.com>
To: Zong Li <zong.li@...ive.com>
Cc: joro@...tes.org, will@...nel.org, robin.murphy@....com,
        tjeznach@...osinc.com, paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, jgg@...pe.ca, kevin.tian@...el.com,
        linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
        linux-riscv@...ts.infradead.org
Subject: Re: [RFC PATCH v2 07/10] iommu/riscv: support nested iommu for
 creating domains owned by userspace

On 14/06/2024 15:21, Zong Li wrote:
> +static struct iommu_domain *
> +riscv_iommu_domain_alloc_user(struct device *dev, u32 flags,
> +			      struct iommu_domain *parent,
> +			      const struct iommu_user_data *user_data)
> +{
> +	struct iommu_domain *domain;
> +	struct riscv_iommu_domain *riscv_domain;
> +
> +	/* Allocate stage-1 domain if it has stage-2 parent domain */
> +	if (parent)
> +		return riscv_iommu_domain_alloc_nested(dev, parent, user_data);
> +
> +	if (flags & ~((IOMMU_HWPT_ALLOC_NEST_PARENT | IOMMU_HWPT_ALLOC_DIRTY_TRACKING)))
> +		return ERR_PTR(-EOPNOTSUPP);
> +

IOMMU_HWPT_ALLOC_DIRTY_TRACKING flag check should be dropped if it's not
supported in code (which looks to be the case in your series) e.g.

	if (flags & ~((IOMMU_HWPT_ALLOC_NEST_PARENT)))
		return ERR_PTR(-EOPNOTSUPP);