Re: [virtio-comment] [RFC PATCH v3 3/4] virtio-rtc: Add alarm feature

[Cornelia Huck <cohuck@redhat.com>]

On Mon, Dec 18 2023, Peter Hilber <peter.hilber@opensynergy.com> wrote:

> Add the VIRTIO_RTC_F_ALARM feature (without normative statements).
>
> The intended use case is: A driver needs to react when an alarm time has
> been reached, but the driver may be in a sleep state or powered off at
> alarm time. The alarm feature can resume and notify the driver in this
> case. Alarms may be retained across device resets (including reset on
> boot).

Does the driver have some kind of control or information about whether
alarms are retained? I.e. to start with a clean slate, if wanted.

I'm not familiar with RTC, so I'm not sure if that even makes sense, or
if I have missed something in the spec.


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