Re: [Xen-devel] [PATCH v3] p2m: use GNTTABOP_unmap_and_duplicate if available

[Ian Campbell <Ian.Campbell@citrix.com>]

On Mon, 2013-11-04 at 17:09 +0100, Roger Pau Monné wrote:
> On 04/11/13 16:49, Ian Campbell wrote:
> > On Mon, 2013-11-04 at 16:38 +0100, Roger Pau Monne wrote:
> >> The new GNTTABOP_unmap_and_duplicate operation 
> > 
> > I don't see this op in mainline Xen anywhere...
> > 
> > Was it part of Stefano's original swiotlb for ARM stuff? If so we've
> > dropped that approach for ARM and the new solution doesn't require
> > hypervisor changes so the upstreaming of this hypercall ended, so you'd
> > have to pick it up and complete that work if you want to use it.
> 
> It's not part of the ARM stuff,

oops, my mistake, sorry.

>  the patch to add that OP is here:
> 
> http://lists.xen.org/archives/html/xen-devel/2013-07/msg02825.html
> 
> I guess I will need to resend that also.

Yes, I think you want to get the hcall locked down before you add
anything to the kernel to use it...