linux-kernel - Re: [PATCH RFC v2 02/11] iommu: Add iommu_group_singleton

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Message-ID: <f52d0412-a88c-6c07-1b40-ff866b288641@linux.intel.com>
Date:   Wed, 30 Mar 2022 19:57:57 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC v2 02/11] iommu: Add iommu_group_singleton_lockdown()

Hi Kevin,

On 2022/3/30 14:50, Tian, Kevin wrote:
>> ie if we have a singleton group that doesn't have ACS and someone
>> hotplugs in another device on a bridge, then our SVA is completely
>> broken and we get data corruption.
> Can we capture that in iommu_probe_device() when identifying
> the group which the probed device will be added to has already been
> locked down for SVA? i.e. make iommu_group_singleton_lockdown()
> in this patch to lock down the fact of singleton group instead of
> the fact of singleton driver...
> 

The iommu_probe_device() is called in the bus notifier callback. It has
no way to stop the probe of the device. Unless we could add a direct
call in the device probe path of the driver core?

Best regards,
baolu