linux-kernel - RE: [PATCH v2 00/11] iommufd: Add nesting infrastructure

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Date:   Tue, 27 Jun 2023 06:02:13 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>
CC:     Jason Gunthorpe <jgg@...dia.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>,
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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 00/11] iommufd: Add nesting infrastructure

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Tuesday, June 27, 2023 1:29 AM
> 
> > I'm not sure whether the MSI region needs a special MSI type or
> > just a general RESV_DIRECT type for 1:1 mapping, though.
> 
> I don't quite get this part. Isn't MSI having IOMMU_RESV_MSI
> and IOMMU_RESV_SW_MSI? Or does it juset mean we should report
> the iommu_resv_type along with reserved regions in new ioctl?
> 

Currently those are iommu internal types. When defining the new
ioctl we need think about what are necessary presenting to the user.

Probably just a list of reserved regions plus a flag to mark which
one is SW_MSI? Except SW_MSI all other reserved region types
just need the user to reserve them w/o knowing more detail.