Re: [Xen-devel] [PATCH LINUX RFC] xen: privcmd: implement IOCTL_PRIVCMD_MMAPBATCH_V2_UNCACHED

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Dec 20, 2013 at 09:19:13AM +0000, Ian Campbell wrote:
> On Wed, 2013-12-18 at 16:16 -0500, Konrad Rzeszutek Wilk wrote:
> > On Wed, Dec 18, 2013 at 05:30:37PM +0000, Ian Campbell wrote:
> > > On ARM we want to use uncached foreign mappings while building the domain
> > > because the guests start with MMU and caches disabled.
> > > 
> > 
> > Why introduce a new ioctl? Could we piggyback on the old one and on ARM
> > do the uncached.
> 
> Because there are (going to be) other circumstances where we do want a
> cached foreign mapping, specifically migration.

Why not then just expand the existing ioctl with a flag? ARM after all
is still experimental so you could do that.

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