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Message-ID: <1383582410.8826.116.camel@kazak.uk.xensource.com>
Date:	Mon, 4 Nov 2013 16:26:50 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Roger Pau Monné <roger.pau@...rix.com>
CC:	<xen-devel@...ts.xen.org>, <linux-kernel@...r.kernel.org>,
	"Stefano Stabellini" <stefano.stabellini@...citrix.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH v3] p2m: use GNTTABOP_unmap_and_duplicate if
 available

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...



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