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Message-ID: <ZMP1sGvDmqVF4YRm@nvidia.com>
Date: Fri, 28 Jul 2023 14:06:56 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
Cc: "Liu, Yi L" <yi.l.liu@...el.com>,
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"Duan, Zhenzhong" <zhenzhong.duan@...el.com>
Subject: Re: [PATCH v3 06/17] iommufd: Only enforce IOMMU_RESV_SW_MSI when
attaching user-managed HWPT
On Fri, Jul 28, 2023 at 10:02:36AM +0000, Tian, Kevin wrote:
> > From: Liu, Yi L <yi.l.liu@...el.com>
> > Sent: Monday, July 24, 2023 7:04 PM
> > }
> >
> > rc = iopt_table_enforce_dev_resv_regions(&hwpt->ioas->iopt, idev-
> > >dev,
> > - &idev->igroup-
> > >sw_msi_start);
> > + &idev->igroup-
> > >sw_msi_start,
> > + !!hwpt->parent);
> > if (rc)
> > goto err_unlock;
>
> I prefer to not setting parent ioas to hwpt in iommufd_hw_pagetable_alloc().
Yes, the prior patch didn't add it to the iopt, so it shouldn't have
an ioas set. The NESTED domains don't have an IOAS almost by
definition.
> then here ioas can be retrieved from hwpt->parent and then it'd be pretty
> clear that in nested case the sw_msi reservation happens in the parent
> instead of pretending the stage-1 hwpt has an ioas too.
Yeah, I'm confused by this patch as well. Since there should be no
IOAS for the NESTED why are we messing with resv_regions?
Jason
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