Re: [Xen-devel] VT-d flush timeout

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.09.14 at 12:44, <andrew.cooper3@xxxxxxxxxx> wrote:
> The AMD code will wait for a period of time for the COMMAND_WAIT to
> start, but not panic() on a timeout.
> 
> By my reading of the code, amd_iommu_flush_iotlb() can complete without
> confirming that the iotlbs have actually been flushed, and all that is
> left behind is an AMD_IOMMU_DEBUG() message.

Now that you say this I recall having stumbled across this questionable
behavior in the past (and perhaps even more than once). Certainly
something for our AMD IOMMU maintainers to look into...

Jan


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