Re: [Xen-devel] Discussion about virtual iommu support for Xen guest

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

> From: Yang Zhang [mailto:yang.zhang.wz@xxxxxxxxx]
> Sent: Friday, May 27, 2016 10:26 AM
> 
> On 2016/5/26 16:29, Lan Tianyu wrote:
> > Hi All:
> > We try pushing virtual iommu support for Xen guest and there are some
> > features blocked by it.
> >
> > Motivation:
> > -----------------------
> > 1) Add SVM(Shared Virtual Memory) support for Xen guest
> > To support iGFX pass-through for SVM enabled devices, it requires
> > virtual iommu support to emulate related registers and intercept/handle
> > guest SVM configure in the VMM.
> 
> IIRC, SVM needs the nested IOMMU support not only virtual iommu. Correct
> me if i am wrong.
> 

nested in physical IOMMU. You don't need to present nested in vIOMMU.

Thanks
Kevin
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