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

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Date: Fri, 21 Jun 2024 15:34:06 +0800
From: Zong Li <zong.li@...ive.com>
To: Joao Martins <joao.m.martins@...cle.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 Thu, Jun 20, 2024 at 12:34 AM Joao Martins <joao.m.martins@...cle.com> wrote:
>
> 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.

Thanks for your tips, I will remove it in the next version.

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