Re: [Xen-devel] [PATCH RFC 1/4] libxl: add a list of abstract 'channels' to the domain config

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Jun 11, 2014 at 09:24:26PM +0100, David Scott wrote:
> A 'channel' is a low-bandwidth private communication channel that
> resembles a physical serial port. Example uses include:
> 
>   * providing initial VM configuration without having to use the
>     network
>   * signalling a guest agent
> 
> Every channel has a string 'name' which the VM can use to find
> the appropriate handler. Each channel has an implementation 'type'
> which currently includes:
> 
>   * NONE: reads will block, writes will be thrown away
>   * PTY: the I/O surfaces as a pty in the backend domain
>   * PATH: writes are appended to a log file in the backend domain
>   * SOCKET: a listening Unix domain socket accepts a connection in
>     the backend domain and proxies
> 
> Signed-off-by: David Scott <dave.scott@xxxxxxxxxx>
> ---
>  tools/libxl/libxl_types.idl |   21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
> index 52f1aa9..4df8d42 100644
> --- a/tools/libxl/libxl_types.idl
> +++ b/tools/libxl/libxl_types.idl
> @@ -51,6 +51,17 @@ libxl_domain_type = Enumeration("domain_type", [
>      (2, "PV"),
>      ], init_val = -1)
>  
> +libxl_channel_type = Enumeration("channel_type", [
> +    # Connected to nothing:
> +    (0, "NONE"),
> +    # Connect to a pty in the backend domain:
> +    (1, "PTY"),
> +    # Spool output to a file in the backend domain:
> +    (2, "PATH"),
> +    # Listen on a Unix domain socket in the backend domain:
> +    (3, "SOCKET"),
> +    ], init_val = 0)
> +

You can omit init_val if it is 0.

Wei.

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