[Qemu-devel] [v3][PATCH 0/2] libxl: try to support IGD passthrough for qemu upstream

[Tiejun Chen <tiejun.chen@intel.com>]

v3:

* Refine some codes based on Campbell's feedback so thanks for Campbell's
  kind guideline to patch #2
* Update the manpages in patch #2

v2:

* Refine patch #2's head description 
* Improve codes quality inside patch #1 based on Wei's comments
* Refill the summary inside patch #0 based on Konrad and Wei's suggestion

When we're working to support IGD GFX passthrough with qemu
upstream, instead of "-gfx_passthru" we'd like to make that
a machine option, "-machine xxx,igd-passthru=on".

https://lists.nongnu.org/archive/html/qemu-devel/2015-01/msg02050.html

This need to bring a change on tool side.

After a discussion with Campbell, we'd like to construct a table to record
all IGD devices we can support. If we hit that table, we should pass that
option. And so we also introduce a new field of type, 'gfx_passthru_kind',
to cooperate with 'gfx_passthru' to cover all scenarios like this,

    gfx_passthru = 0    => sets build_info.u.gfx_passthru to false
    gfx_passthru = 1    => sets build_info.u.gfx_passthru to true and
                           build_info.u.gfx_passthru_kind to DEFAULT
    gfx_passthru = "igd"    => sets build_info.u.gfx_passthru to false
                               and build_info.u.gfx_passthru_kind to IGD

And note actually that option "-gfx_passthru" is just introduced to
work for qemu-xen-traditional so we should get this away from
libxl__build_device_model_args_new() in the case of qemu upstream. 

----------------------------------------------------------------
Tiejun Chen (2):
      libxl: introduce libxl__is_igd_vga_passthru
      libxl: introduce gfx_passthru_kind

 docs/man/xl.cfg.pod.5        |  11 ++--
 tools/libxl/libxl.h          |   6 ++
 tools/libxl/libxl_dm.c       |  36 +++++++++-
 tools/libxl/libxl_internal.h |   6 ++
 tools/libxl/libxl_pci.c      | 124 +++++++++++++++++++++++++++++++++++
 tools/libxl/libxl_types.idl  |   6 ++
 tools/libxl/xl_cmdimpl.c     |  14 +++-
 7 files changed, 194 insertions(+), 9 deletions(-)

Thanks
Tiejun