Re: [Xen-devel] ATS and dependent features

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

ATS should be a host feature controlled by iommu, and I don't think dom0 can 
control  it from Xen's architecture.   Perhaps we need to forbid dom0 
controlling these features. 
Xiantao

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Tuesday, November 27, 2012 5:42 PM
> To: Zhang, Xiantao; xen-devel
> Subject: ATS and dependent features
> 
> All,
> 
> 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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