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

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Message-ID: <BN9PR11MB527683351B687B97AB84B51B8C13A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 10 Aug 2023 02:49:59 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, Jason Gunthorpe <jgg@...dia.com>
CC:     "joro@...tes.org" <joro@...tes.org>,
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        <shameerali.kolothum.thodi@...wei.com>,
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        "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: Thursday, August 10, 2023 4:17 AM
> 
> On Wed, Aug 09, 2023 at 04:19:01PM -0300, Jason Gunthorpe wrote:
> > On Wed, Aug 09, 2023 at 12:12:25PM -0700, Nicolin Chen wrote:
> > > On Wed, Aug 09, 2023 at 01:24:56PM -0300, Jason Gunthorpe wrote:
> > > > Similarly for managing the array of invalidation commands.
> > >
> > > You mean an embedded uptr inside a driver user data struct right?
> > > Sure, that should go through the new helper too.
> >
> > If we are committed that all drivers have to process an array then put
> > the array in the top level struct and pass it in the same user_data
> > struct and use another helper to allow the driver to iterate through
> > it.
> 
> I see. Both VTD and SMMU pass uptr to the arrays of invalidation
> commands/requests. The only difference is that SMMU's array is a
> ring buffer other than a plain one indexing from the beginning.
> But the helper could take two index inputs, which should work for
> VTD case too. If another IOMMU driver only supports one request,
> rather than a array of requests, we can treat that as a single-
> entry array.
> 

I like this approach.