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

[Julien Grall <julien.grall@xxxxxxxxxx>]

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?

Regards,

-- 
Julien Grall

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