linux-kernel - Re: [PATCH v7 0/5] Define EINVAL as device/domain incompatibility

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Date:   Mon, 17 Oct 2022 20:54:53 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nicolin Chen <nicolinc@...dia.com>, joro@...tes.org
Cc:     will@...nel.org, robin.murphy@....com, kevin.tian@...el.com,
        quic_jjohnson@...cinc.com, suravee.suthikulpanit@....com,
        robdclark@...il.com, dwmw2@...radead.org, baolu.lu@...ux.intel.com,
        yong.wu@...iatek.com, matthias.bgg@...il.com, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
        thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
        jean-philippe@...aro.org, tglx@...utronix.de,
        shameerali.kolothum.thodi@...wei.com,
        christophe.jaillet@...adoo.fr, yangyicong@...ilicon.com,
        yangyingliang@...wei.com, quic_saipraka@...cinc.com,
        jon@...id-run.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-tegra@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v7 0/5] Define EINVAL as device/domain incompatibility

On Mon, Oct 17, 2022 at 04:00:29PM -0700, Nicolin Chen wrote:
> This series is to replace the previous EMEDIUMTYPE patch in a VFIO series:
> https://lore.kernel.org/kvm/Yxnt9uQTmbqul5lf@8bytes.org/
> 
> The purpose is to regulate all existing ->attach_dev callback functions to
> use EINVAL exclusively for an incompatibility error between a device and a
> domain. This allows VFIO and IOMMUFD to detect such a soft error, and then
> try a different domain with the same device.
> 
> Among all the patches, the first two are preparatory changes. And then one
> patch to update kdocs and another three patches for the enforcement effort.
> 
> Although it might be ideal to merge the previous VFIO series together with
> this series, given the number of new changes, the review in the IOMMU list
> might need a couple of rounds to finalize. Also, considering that v6.0 is
> at rc5 now, perhaps we could merge this IOMMU series and the VFIO one in
> different cycles to avoid merge conflicts. If there's less concern for it,
> I can respin the finalized version of this series with the previous VFIO
> one to merge together into the VFIO tree.
> 
> This series is also available on Github:
> https://github.com/nicolinc/iommufd/commits/iommu_attach_dev-v7

Since it didn't make v6.1-rc1, I'd like this on a PR as we have two
trees that will need it now.

Joerg I can make this into a formal signed PR if that is how you'd
like things?

Thanks,
Jason