Re: [Xen-devel] [PATCH 0 of 6 V6] amd iommu: support ats/gpgpu passthru on iommuv2 systems

[Wei Wang <wei.wang2@xxxxxxx>]

On 03/14/2012 03:09 PM, Ian Campbell wrote:
> On Thu, 2012-03-08 at 13:21 +0000, Wei Wang wrote:
> > Hi,
> > This is patch set v6. It includes all pending patches that are needed to enable 
> > gpgpu passthrough
> I'm curious, is any of this actually specific to GPGPU passthrough or is
> it just that GPGPU passthrough happens to be the main (only?) reason you
> would want to expose a virtualised IOMMU to the guest OS? Are there any
> other use cases?
>
> Ian.
For now, gpgpu is the only use case. But actually any sophisticated ats 
devices that supports PASID and PRI capabilities will need to work with 
iommuv2 driver in guest OS, so they will also need a virtual iommu in 
guest space. Please check ats spec 1.1, those capabilities have been 
documented and they are not specific to GPGPU.
Thanks,
Wei


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