linux-kernel - Re: [PATCH v2 01/11] iommu: Add new iommu op to create domains owned by userspace

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Message-ID: <ZH/L3ucGnzHf5kqf@nvidia.com>
Date:   Tue, 6 Jun 2023 21:14:22 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>
Subject: Re: [PATCH v2 01/11] iommu: Add new iommu op to create domains owned
 by userspace

On Tue, Jun 06, 2023 at 12:43:44PM -0700, Nicolin Chen wrote:
> On Tue, Jun 06, 2023 at 11:08:44AM -0300, Jason Gunthorpe wrote:
> > On Wed, May 24, 2023 at 06:41:41PM -0700, Nicolin Chen wrote:
> > 
> > > Upon a quick check, I think we could. Though it'd be slightly
> > > mismatched with the domain_alloc op, it should be fine since
> > > iommufd is likely to be the only caller.
> > 
> > Ideally the main op would return ERR_PTR too
> 
> Yea. It just seems to be a bit painful to change it for that.
> 
> Worth a big series?

Probably not..

Jason