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

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Date:   Wed, 27 Sep 2023 08:09:12 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        "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>
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: Baolu Lu <baolu.lu@...ux.intel.com>
> Sent: Wednesday, September 27, 2023 3:58 PM
> 
> On 2023/9/27 15:52, Tian, Kevin wrote:
> >> 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.
> 
> We already have the code in Linus' tree. The idxd driver uses it for
> kernel DMA with pasid.
> 

ah, I forgot. 😊 probably can mention it in the commit message.