linux-kernel - Re: [RFC v16 1/9] iommu: Introduce attach/detach_pasid

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Date:   Wed, 8 Dec 2021 10:44:14 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     eric.auger@...hat.com, Joerg Roedel <joro@...tes.org>
Cc:     baolu.lu@...ux.intel.com, peter.maydell@...aro.org,
        kvm@...r.kernel.org, vivek.gautam@....com,
        kvmarm@...ts.cs.columbia.edu, eric.auger.pro@...il.com,
        jean-philippe@...aro.org, ashok.raj@...el.com, maz@...nel.org,
        vsethi@...dia.com, zhangfei.gao@...aro.org, kevin.tian@...el.com,
        will@...nel.org, alex.williamson@...hat.com,
        wangxingang5@...wei.com, linux-kernel@...r.kernel.org,
        lushenming@...wei.com, iommu@...ts.linux-foundation.org,
        robin.murphy@....com, Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [RFC v16 1/9] iommu: Introduce attach/detach_pasid_table API

Hi Eric,

On 12/7/21 6:22 PM, Eric Auger wrote:
> On 12/6/21 11:48 AM, Joerg Roedel wrote:
>> On Wed, Oct 27, 2021 at 12:44:20PM +0200, Eric Auger wrote:
>>> Signed-off-by: Jean-Philippe Brucker<jean-philippe.brucker@....com>
>>> Signed-off-by: Liu, Yi L<yi.l.liu@...ux.intel.com>
>>> Signed-off-by: Ashok Raj<ashok.raj@...el.com>
>>> Signed-off-by: Jacob Pan<jacob.jun.pan@...ux.intel.com>
>>> Signed-off-by: Eric Auger<eric.auger@...hat.com>
>> This Signed-of-by chain looks dubious, you are the author but the last
>> one in the chain?
> The 1st RFC in Aug 2018
> (https://lists.cs.columbia.edu/pipermail/kvmarm/2018-August/032478.html)
> said this was a generalization of Jacob's patch
> 
> 
>    [PATCH v5 01/23] iommu: introduce bind_pasid_table API function
> 
> 
>    https://lists.linuxfoundation.org/pipermail/iommu/2018-May/027647.html
> 
> So indeed Jacob should be the author. I guess the multiple rebases got
> this eventually replaced at some point, which is not an excuse. Please
> forgive me for that.
> Now the original patch already had this list of SoB so I don't know if I
> shall simplify it.

As we have decided to move the nested mode (dual stages) implementation
onto the developing iommufd framework, what's the value of adding this
into iommu core?

Best regards,
baolu