linux-kernel - RE: [PATCH v4 09/12] iommu/vt-d: Add iotlb flush for nested domain

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Message-ID: <BN9PR11MB527666891DBDA346D9EA58018C1EA@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Mon, 21 Aug 2023 01:24:01 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        Jason Gunthorpe <jgg@...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>,
        "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>,
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        <shameerali.kolothum.thodi@...wei.com>,
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        "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 v4 09/12] iommu/vt-d: Add iotlb flush for nested domain

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, August 19, 2023 2:26 AM
> 
> On Fri, Aug 18, 2023 at 03:20:55PM -0300, Jason Gunthorpe wrote:
> > On Fri, Aug 18, 2023 at 10:56:45AM -0700, Nicolin Chen wrote:
> >
> > > > The highest array index sounds generic, the error code maybe is too
> > >
> > > We could do in its and report the error code in its raw form:
> > > 	__u32 out_array_index;
> > > 	/* number of bits used to report error code in the returned
> array_index */
> > > 	__u32 out_array_index_error_code_bits;
> > > Or just:
> > > 	__u32 out_array_index;
> > > 	__u32 out_error_code;
> > >
> > > Do we have to define a list of generic error code?
> >
> > out_driver_error_code may be OK
> 
> Ack. Will implement the array in that way.
> 

Yes. Error code is driver specific. Just having a field to carry it is
sufficient.