Re: [Xen-devel] [PATCH v10 3/6] x86/ioreq server: Add device model wrappers for new DMOP

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Apr 03, 2017 at 09:13:20AM +0100, Paul Durrant wrote:
> > -----Original Message-----
> > From: Yu Zhang [mailto:yu.c.zhang@xxxxxxxxxxxxxxx]
> > Sent: 02 April 2017 13:24
> > To: xen-devel@xxxxxxxxxxxxx
> > Cc: zhiyuan.lv@xxxxxxxxx; Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Ian
> > Jackson <Ian.Jackson@xxxxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>
> > Subject: [PATCH v10 3/6] x86/ioreq server: Add device model wrappers for
> > new DMOP
> > 
> > A new device model wrapper is added for the newly introduced
> > DMOP - XEN_DMOP_map_mem_type_to_ioreq_server.
> > 
> > Since currently this DMOP only supports the emulation of write
> > operations, attempts to trigger the DMOP with values other than
> > XEN_DMOP_IOREQ_MEM_ACCESS_WRITE or 0(to unmap the ioreq server)
> > shall fail. The wrapper shall be updated once read operations
> > are also to be emulated in the future.
> > 
> > Also note currently this DMOP only supports one memory type,
> > and can be extended in the future to map multiple memory types
> > to multiple ioreq servers, e.g. mapping HVMMEM_ioreq_serverX to
> > ioreq server X, This wrapper shall be updated when such change
> > is made.
> > 
> > Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>
> 
> Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> 
> ...with one observation...
> 
> > ---
> > Cc: Paul Durrant <paul.durrant@xxxxxxxxxx>
> > Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> > Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> > ---
> >  tools/libs/devicemodel/core.c                   | 25
> > +++++++++++++++++++++++++
> >  tools/libs/devicemodel/include/xendevicemodel.h | 18
> > ++++++++++++++++++
> >  tools/libs/devicemodel/libxendevicemodel.map    |  1 +
> >  tools/libxc/include/xenctrl_compat.h            |  5 +++++
> >  tools/libxc/xc_devicemodel_compat.c             | 17 +++++++++++++++++
> 
> This is new code so I don't think you really want compat code for this, do 
> you?

Correct. No compat code is needed.

Wei.

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