Re: [RFC PATCH v3 0/7] Add virtio_rtc module and related changes

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On 14 March 2024 11:13:37 CET, Peter Hilber <peter.hilber@xxxxxxxxxxxxxxx> wrote:
>> To a certain extent, as long as the virtio-rtc device is designed to expose time precisely and unambiguously, it's less important if the Linux kernel *today* can use that. Although of course we should strive for that. Let's be...well, *unambiguous*, I suppose... that we've changed topics to discuss that though.
>> 
>
>As Virtio is extensible (unlike hardware), my approach is to mostly specify
>only what also has a PoC user and a use case.

If we get memory-mapped (X, Y, Z, ±x, ±y) I'll have a user and a use case on day one. Otherwise, as I said in my first response, I can go do that as a separate device and decide that virtio_rtc doesn't meet our needs (especially for maintaining accuracy over LM).

My main concern for virto_rtc is that we avoid *ambiguity*. Yes, I get that it's extensible but we don't want a v1.0 of the spec, implemented by various hypervisors, which still leaves guests not knowing what the actual time is. That would not be good. And even UTC without a leap second indicator has that problem.





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