Re: [Xen-devel] [PATCH v6 02/12] x86/mm: add HYPERVISOR_memory_op to acquire guest resources

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Sep 12, 2017 at 05:10:05PM +0100, Paul Durrant wrote:
> Certain memory resources associated with a guest are not necessarily
> present in the guest P2M and so are not necessarily available to be
> foreign-mapped by a tools domain unless they are inserted, which risks
> shattering a super-page mapping.
> 
> This patch adds a new memory op to allow such a resource to be priv-mapped
> directly, by either a PV or HVM tools domain: grant table frames.
> 
> NOTE: Whilst the new op is not intrinsicly specific to the x86 architecture,
>       I have no means to test it on an ARM platform and so cannot verify
>       that it functions correctly. Hence it is currently only implemented
>       for x86.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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