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Re: [Qemu-devel] [PATCH] xen: Emit RTC_CHANGE upon TIMEOFFSET ioreq
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From: |
Stefano Stabellini |
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Subject: |
Re: [Qemu-devel] [PATCH] xen: Emit RTC_CHANGE upon TIMEOFFSET ioreq |
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Date: |
Tue, 22 Aug 2017 11:05:01 -0700 (PDT) |
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User-agent: |
Alpine 2.10 (DEB 1266 2009-07-14) |
On Tue, 22 Aug 2017, Ross Lagerwall wrote:
> 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
> > > information.
> >
> > 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.
OK, please expland the patch description and repost.