Re: [Xen-devel] [PATCH v19 06/11] x86/hvm/ioreq: add a new mappable resource type...

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Paul Durrant <paul.durrant@xxxxxxxxxx> 03/29/18 5:49 PM >>>
>... XENMEM_resource_ioreq_server
>
>This patch adds support for a new resource type that can be mapped using
>the XENMEM_acquire_resource memory op.
>
>If an emulator makes use of this resource type then, instead of mapping
>gfns, the IOREQ server will allocate pages which are assigned to the
>emulating domain. These pages will never be present in the P2M of the
>guest at any point (and are not even shared with the guest) and so are not
>vulnerable to any direct attack by the guest.
>
>NOTE: Use of the new resource type is not compatible with use of
>XEN_DMOP_get_ioreq_server_info unless the XEN_DMOP_no_gfns flag is
>set.
>
>Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

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