Re: [Xen-devel] [PATCH 7/7] x86: add iommu_ops to map and unmap pages, and also to flush the IOTLB

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Tian, Kevin [mailto:kevin.tian@xxxxxxxxx]
> Sent: 24 February 2018 03:02
> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>; Wei Liu
> <wei.liu2@xxxxxxxxxx>; George Dunlap <George.Dunlap@xxxxxxxxxx>;
> Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Ian Jackson
> <Ian.Jackson@xxxxxxxxxx>; Tim (Xen.org) <tim@xxxxxxx>; Jan Beulich
> <jbeulich@xxxxxxxx>
> Subject: RE: [Xen-devel] [PATCH 7/7] x86: add iommu_ops to map and
> unmap pages, and also to flush the IOTLB
[snip]
> 
> >
> > ...so my plan is that the dom0 API picks a bfn, does the mapping and then
> > passes the bfn back to the caller.
> >
> 
> A curious question. How to pass the domid from XenGT to pvIOMMU
> driver so the latter knows whether it's a local or remote mapping?
> Ideally pvIOMMU driver is registered to Linux IOMMU core layer,
> of which all existing API wrappers are only for local mapping today...
> 

It may well be that, for remote mapping, that layer is just not appropriate. 
I'll look into that when I get to that stage.

Cheers,

    Paul

> Thanks
> Kevin
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