Re: [Xen-devel] [PATCH] x86/ats: Disable Address Translation Services by default

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.08.14 at 02:37, <yang.z.zhang@xxxxxxxxx> wrote:
> Jan Beulich wrote on 2014-08-22:
>>>>> On 20.08.14 at 18:01, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> Xen cannot safely use any ATS functionality until it gains
>>> asynchronous queued invalidation support, because of the current
>>> synchronous wait for completion.
>>> 
>>> Do not turn ATS on by default.
>>> 
>>> While editing the default in the command line documentation, correct
>>> the statement regarding PCI Passthrough.  ATS is purely a
>>> performance optimisation, and is certainly not required for PCI Passthrough 
> to function.
>>> 
>>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> 
>> Even if not mandated by ./MAINTAINERS I think this definitely should
>> have been Cc-ed to the VT-d and AMD IOMMU maintainers (now done).
> 
> Thanks for forwarding to us.
> 
> BTW, do you want us to give a ack or just let us know?

If you don't object to the change, an ack would certainly be
appreciated. If you object, comments as to alternatives would
be kind of expected.

Jan


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