Re: [Xen-devel] [PATCH 2/2] VT-d: Fix vt-d flush timeout issue.

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Xu, Quan
> Sent: Thursday, December 03, 2015 4:09 PM
> 
> If IOTLB/Context/IETC flush is timeout, we should think
> all devices under this IOMMU cannot function correctly.
> So for each device under this IOMMU we'll mark it as
> unassignable and kill the domain owning the device.
> 
> If Device-TLB flush is timeout, we'll mark the target
> ATS device as unassignable and kill the domain owning
> this device. When the invalidation request descriptor
> is timeout, hypervisor cannot find out which Device-TLB
> invalidate descriptor submitted before is not correct.
> So mark all of the domain's ATS devices as unassignable.

Another thought here. If we do timeout check within
dev_invalidate_iotlb for each ATS device, could we identify
bogus device accurately?


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