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Re: [Xen-devel] ATS and dependent features

>>> On 29.11.12 at 02:07, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx> wrote:
> ATS should be a host feature controlled by iommu, and I don't think dom0 can 
> control  it from Xen's architecture.

"Can" or "should"? Because from all I can tell it currently clearly

>   Perhaps we need to forbid dom0 controlling these features. 

That's what I was trying to find out. How to properly do that
with pv-ops I don't know; in our forward ported kernels I can
simply make the respective config options conditional upon !XEN.


>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> while investigating an issue with some device not working under Xen without
>> "ats=off", I started wondering whether it is correct to allow the Dom0 
> kernel
>> concurrent control over ATS, PRI, and PASID - it would seem to me that with
>> Xen controlling the IOMMU, it should also have exclusive control over the
>> enabling of those features.
>> Thanks for any comments in this regard,
>> Jan

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