Re: [Xen-devel] [PATCH v5 11/12] x86/hvm/ioreq: defer mapping gfns until they are actually requsted

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Sep 08, 2017 at 04:21:36PM +0100, Paul Durrant wrote:
> A subsequent patch will introduce a new scheme to allow an emulator to
> map ioreq server pages directly from Xen rather than the guest P2M.
> 
> This patch lays the groundwork for that change by deferring mapping of
> gfns until their values are requested by an emulator. To that end, the
> pad field of the xen_dm_op_get_ioreq_server_info structure is re-purposed
> to a flags field and new flag, XEN_DMOP_no_gfns, defined which modifies the
> behaviour of XEN_DMOP_get_ioreq_server_info to allow the caller to avoid
> requesting the gfn values.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

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

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