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Re: [Xen-devel] [PATCH v10 0/8] xen/arm: introduce GNTTABOP_cache_flush

On Wed, 22 Oct 2014, Julien Grall wrote:
> Hi Stefano,
> On 10/21/2014 07:10 PM, Stefano Stabellini wrote:
> > Hi all,
> > this patch series introduces a new hypercall to perform cache
> > maintenance operations on behalf of the guest. It is useful for dom0 to
> > be able to cache flush pages involved in a dma operation with
> > non-coherent devices.
> > 
> > It also removes XENFEAT_grant_map_identity as the feature is no longer
> > necessary: it was used to achieve the same goal but the guest can now
> > use the hypercall instead. Keeping the flag would also have a
> > significant performance impact as a new p2m mapping gets created and
> > then destroyed for every grant that is mapped and unmapped in dom0.
> I don't remembered if I asked before. Do you plan to write somewhere
> (wiki page, release note...) that some version of Linux (IIRC Linux 3.16
> and 3.17) are broken when running as DOM0?

I plan to unbreak them by backporting the fix.

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