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
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