linux-kernel - RE: [RFC 8/8] iommu/vt-d: Add set_dev

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Message-ID: <BN9PR11MB52766E649727842C98B7396B8CC2A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Wed, 27 Sep 2023 07:52:53 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "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>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.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>,
        "Martins, Joao" <joao.m.martins@...cle.com>
Subject: RE: [RFC 8/8] iommu/vt-d: Add set_dev_pasid callback for nested
 domain

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Tuesday, September 26, 2023 5:27 PM
> 
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> This allows the upper layers to set a nested type domain to a PASID of a
> device if the PASID feature is supported by the IOMMU hardware.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Yi Liu <yi.l.liu@...el.com>
> ---
>  drivers/iommu/intel/nested.c | 47
> ++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)

pasid can be attached to either user hwpt or kernel hwpt.

We should also introduce a set_dev_pasid callback for non-nest domain ops.