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

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Message-ID: <04af40a3-1675-4b1c-27de-39d261dcb1cf@linux.intel.com>
Date:   Wed, 27 Sep 2023 15:57:41 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.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:     baolu.lu@...ux.intel.com, "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

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.

Best regards,
baolu