Re: [Xen-devel] [Qemu-devel] [RFC][PATCH 1/1] libxl: add one machine property to support IGD GFX passthrough

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

CCed Stefano.

Thanks
Tiejun

On 2015/1/21 15:19, Tiejun Chen wrote:
> 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,gfx_passthru=on". This need
> to bring several changes on tool side.
>
> Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> ---
>   tools/libxl/libxl_dm.c | 19 +++++++++++++++++--
>   1 file changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
> index c2b0487..2b59d2c 100644
> --- a/tools/libxl/libxl_dm.c
> +++ b/tools/libxl/libxl_dm.c
> @@ -318,7 +318,10 @@ static char ** 
> libxl__build_device_model_args_old(libxl__gc *gc,
>               flexarray_vappend(dm_args, "-net", "none", NULL);
>           }
>           if (libxl_defbool_val(b_info->u.hvm.gfx_passthru)) {
> -            flexarray_append(dm_args, "-gfx_passthru");
> +            if (b_info->device_model_version !=
> +                LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
> +                flexarray_append(dm_args, "-gfx_passthru");
> +            }
>           }
>       } else {
>           if (!sdl && !vnc)
> @@ -702,7 +705,10 @@ static char ** 
> libxl__build_device_model_args_new(libxl__gc *gc,
>               flexarray_append(dm_args, "none");
>           }
>           if (libxl_defbool_val(b_info->u.hvm.gfx_passthru)) {
> -            flexarray_append(dm_args, "-gfx_passthru");
> +            if (b_info->device_model_version !=
> +                LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
> +                flexarray_append(dm_args, "-gfx_passthru");
> +            }
>           }
>       } else {
>           if (!sdl && !vnc) {
> @@ -748,6 +754,15 @@ static char ** 
> libxl__build_device_model_args_new(libxl__gc *gc,
>                                               machinearg, max_ram_below_4g);
>               }
>           }
> +
> +        if (b_info->device_model_version ==
> +            LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
> +            if (libxl_defbool_val(b_info->u.hvm.gfx_passthru)) {
> +                machinearg = libxl__sprintf(gc, "%s,gfx_passthru=on",
> +                                            machinearg);
> +            }
> +        }
> +
>           flexarray_append(dm_args, machinearg);
>           for (i = 0; b_info->extra_hvm && b_info->extra_hvm[i] != NULL; i++)
>               flexarray_append(dm_args, b_info->extra_hvm[i]);
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