linux-kernel - RE: [PATCH v2 02/11] iommu: Add nested domain support

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Date:   Wed, 24 May 2023 05:03:37 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.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>,
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        "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 02/11] iommu: Add nested domain support

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, May 20, 2023 2:49 AM
> 
> On Fri, May 19, 2023 at 08:51:21AM +0000, Tian, Kevin wrote:
> 
> > > @@ -346,6 +350,10 @@ struct iommu_ops {
> > >   * @iotlb_sync_map: Sync mappings created recently using @map to the
> > > hardware
> > >   * @iotlb_sync: Flush all queued ranges from the hardware TLBs and
> empty
> > > flush
> > >   *            queue
> > > + * @cache_invalidate_user: Flush hardware TLBs caching user space IO
> > > mappings
> > > + * @cache_invalidate_user_data_len: Defined length of input user data
> for
> > > the
> > > + *                                  cache_invalidate_user op, being sizeof the
> > > + *                                  structure in include/uapi/linux/iommufd.h
> >
> > same as comment to last patch, can this be merged with @hw_info?
> 
> I think it's better to keep them separate, since this is added
> in struct iommu_domain_ops, given it is domain/hwpt specific,
> while the hw_info is in struct iommu_ops?
> 

Just be curious whether there are real examples in which the data
len might be different upon the hwpt type...