Re: [Xen-devel] [libvirt] [PATCH v2] libxl: Implement basic video device selection

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Fri, Apr 04, 2014 at 11:36:39AM +0200, Stefan Bader wrote:
> +static int
> +libxlSetBuildGraphics(virDomainDefPtr def, libxl_domain_config *d_config)
> +{
> +    libxl_domain_build_info *b_info = &d_config->b_info;
> +
> +    /*
> +     * Take the first defined video device (graphics card) to display
> +     * on the first graphics device (display).
> +     * Right now only type and vram info is used and anything beside
> +     * type xen and vga is mapped to cirrus.
> +     */
> +    if (def->nvideos) {
> +        unsigned int min_vram = 8 * 1024;
> +
> +        switch (def->videos[0]->type) {
> +            case VIR_DOMAIN_VIDEO_TYPE_VGA:
> +            case VIR_DOMAIN_VIDEO_TYPE_XEN:
> +                b_info->u.hvm.vga.kind = LIBXL_VGA_INTERFACE_TYPE_STD;
> +                /*
> +                 * Libxl enforces a minimal VRAM size of 8M when using
> +                 * LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL or
> +                 * 16M for LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN.
> +                 * Avoid build failures and go with the minimum if less
> +                 * is specified.
> +                 */
> +                switch (b_info->device_model_version) {
> +                    case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL:
> +                        min_vram = 8 * 1024;
> +                        break;
> +                    case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN:
> +                    default:
> +                        min_vram = 16 * 1024;
> +                }
> +                break;
> +            default:
> +                /*
> +                 * Ignore any other device type and use Cirrus. Again fix
> +                 * up the minimal VRAM to what libxl expects.
> +                 */

We shouldn't do that 'default'. For any device type that Xen can't support
we should report  VIR_ERR_CONFIG_UNSUPPORTED.

Regards,
Daniel
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