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Date:   Thu, 30 Jun 2022 08:45:29 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Yong Wu <yong.wu@...iatek.com>
CC:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "jordan@...micpenguin.net" <jordan@...micpenguin.net>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "will@...nel.org" <will@...nel.org>,
        "alyssa@...enzweig.io" <alyssa@...enzweig.io>,
        "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "zhang.lyra@...il.com" <zhang.lyra@...il.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "yangyingliang@...wei.com" <yangyingliang@...wei.com>,
        "orsonzhai@...il.com" <orsonzhai@...il.com>,
        "gerald.schaefer@...ux.ibm.com" <gerald.schaefer@...ux.ibm.com>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "christophe.jaillet@...adoo.fr" <christophe.jaillet@...adoo.fr>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "marcan@...can.st" <marcan@...can.st>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "baolin.wang7@...il.com" <baolin.wang7@...il.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "robin.murphy@....com" <robin.murphy@....com>
Subject: Re: [PATCH v3 1/5] iommu: Return -EMEDIUMTYPE for incompatible
 domain and device/group

On Thu, Jun 30, 2022 at 05:33:16PM +0800, Yong Wu wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Wed, 2022-06-29 at 12:47 -0700, Nicolin Chen wrote:
> > On Fri, Jun 24, 2022 at 03:19:43PM -0300, Jason Gunthorpe wrote:
> > > On Fri, Jun 24, 2022 at 06:35:49PM +0800, Yong Wu wrote:
> > >
> > > > > > It's not used in VFIO context. "return 0" just satisfy the
> > > > > > iommu
> > > > > > framework to go ahead. and yes, here we only allow the shared
> > > > > > "mapping-domain" (All the devices share a domain created
> > > > > > internally).
> > >
> > > What part of the iommu framework is trying to attach a domain and
> > > wants to see success when the domain was not actually attached ?
> > >
> > > > > What prevent this driver from being used in VFIO context?
> > > >
> > > > Nothing prevent this. Just I didn't test.
> > >
> > > This is why it is wrong to return success here.
> >
> > Hi Yong, would you or someone you know be able to confirm whether
> > this "return 0" is still a must or not?
> >
> > Considering that it's an old 32-bit platform for MTK, if it would
> > take time to do so, I'd like to drop the change in MTK driver and
> > note in commit log for you or other MTK folks to change in future.
> 
> Yes. Please help drop the change in this file.
> 
> Sorry I don't have the board at hand right now and I could not list the
> backtrace where this is needed(should be bus_iommu_probe from the
> previous debug...)

OK. Thanks for the reply.

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