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Re: [Xen-devel] [PATCH] xen: Emit RTC_CHANGE upon TIMEOFFSET ioreq

On 08/21/2017 11:30 PM, Stefano Stabellini wrote:
On Mon, 21 Aug 2017, Ross Lagerwall wrote:
When the guest writes to the RTC, Xen emulates it and broadcasts a
TIMEOFFSET ioreq. Emit an RTC_CHANGE QMP message when this happens
rather than ignoring it so that something useful can be done with the

Are there any handlers of the RTC_CHANGE QMP message today? What happens
if there are no handlers?

The libxl toolstack doesn't handle it nor does the XAPI project currently, although we plan on modifying XAPI to handle it.

It is simply an event that is broadcast to any QMP monitors. If nothing handles the event, then it is the same behavior as before. If something is interested in the event, then it can make use of the time offset however it wants.

Ross Lagerwall

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