Re: [Xen-devel] [PATCH v3 04/11] libxl: add generic function to add device

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Jun 27, 2017 at 01:03:20PM +0300, Oleksandr Grytsov wrote:
> From: Oleksandr Grytsov <oleksandr_grytsov@xxxxxxxx>
> 
> Add libxl__device_add functio.

function

> Almost all devices have similar libxl__device_xxxx_add function.
> This generic function implements same functionality but
> using the device handling framework. The device specific
> part this is setting xen store configuration. This part
> is moved to set_xenstore_config callback of the device framework.
> 

Right. I think this is a good idea in general.

I don't see exiting device ported to the new framework, why?

We really don't want two sets of code that does the same thing in libxl.
That's a recipe for bugs.

> Signed-off-by: Oleksandr Grytsov <oleksandr_grytsov@xxxxxxxx>
[...]
>  /*
> diff --git a/tools/libxl/libxl_vdispl.c b/tools/libxl/libxl_vdispl.c
> index a628adc..c79bcda 100644
> --- a/tools/libxl/libxl_vdispl.c
> +++ b/tools/libxl/libxl_vdispl.c
> @@ -14,6 +14,21 @@
>  
>  #include "libxl_internal.h"
>  
> +static int libxl__device_vdispl_setdefault(libxl__gc *gc, uint32_t domid,
> +                                           libxl_device_vdispl *vdispl)
> +{
> +    int rc;
> +
> +    rc = libxl__resolve_domid(gc, vdispl->backend_domname,
> +                              &vdispl->backend_domid);
> +
> +    if (vdispl->devid == -1) {
> +        vdispl->devid = libxl__device_nextid(gc, domid, "vdispl");
> +    }
> +

No need to have {}.

> +    return rc;
> +}
> +
>  static int libxl__device_from_vdispl(libxl__gc *gc, uint32_t domid,
>                                       libxl_device_vdispl *vdispl,
>                                       libxl__device *device)
> @@ -47,7 +62,7 @@ static void libxl__device_vdispl_add(libxl__egc *egc, 
> uint32_t domid,
>                                       libxl_device_vdispl *vdispl,
>                                       libxl__ao_device *aodev)
>  {
> -
> +    libxl__device_add(egc, domid, &libxl__vdispl_devtype, vdispl, aodev);
>  }
>  
>  libxl_device_vdispl *libxl_device_vdispl_list(libxl_ctx *ctx, uint32_t domid,
> -- 
> 2.7.4
> 

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