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Re: [RFC PATCH Hyperlaunch v2] xenconsole: Add connected flag
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 20 Dec 2024 14:00:18 +0100
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 20 Dec 2024 13:00:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.12.2024 23:32, Jason Andryuk wrote:
> --- a/xen/include/public/io/console.h
> +++ b/xen/include/public/io/console.h
> @@ -19,6 +19,19 @@ struct xencons_interface {
> char out[2048];
> XENCONS_RING_IDX in_cons, in_prod;
> XENCONS_RING_IDX out_cons, out_prod;
> +/*
> + * Flag values signaling from backend to frontend whether the console is
> + * connected. i.e. Whether it will be serviced and emptied.
> + *
> + * The flag starts as disconnected.
> + */
> +#define XENCONSOLE_DISCONNECTED 0
> +/*
> + * The flag is set to connected when the backend connects and the console
> + * will be serviced.
> + */
> +#define XENCONSOLE_CONNECTED 1
> + uint32_t flag;
> };
Given no other information, how would a guest know that it can actually
expect the flag to (eventually) become set?
Jan
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