Re: [Xen-devel] Does XEN ARM support RTC in domu?

[Peng Fan <peng.fan@xxxxxxx>]

Hi Julien,

> -----Original Message-----
> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of
> Peng Fan
> Sent: 2018年11月5日 10:11
> To: Julien Grall <julien.grall@xxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx;
> Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Subject: Re: [Xen-devel] Does XEN ARM support RTC in domu?
> 
> Hi Julien,
> 
> > >>
> > >>>
> > >>> Just have a question, does XEN ARM support RTC in domu? To support
> > >>> Android
> > >> in DomU, RTC is needed for alarm, but I did not find information
> > >> about RTC on xen for domu. So this need a new RTC paravirtualization
> driver?
> > Any suggestions?
> > >>
> > >> By RTC, do you mean Real-Time Clock? Something like PL031? Or do
> > >> you have something else in mind?
> > >
> > > Yes, Real Time Clock like PL031 in DomU. I do not have a good idea
> > > support RTC in ARM DomU, KVM and XEN x86 seems use emulated RTC in
> > > qemu. Thinking of paravirtual RTC, and dom0 control the expire time
> > > for
> > alarm.
> >
> > The PL031 is quite small (based on the QEMU version). So I think it
> > would be fine to provide an emulation in the hypervisor.
> 
> Ok. Just like the hvm x86, implement emulate PL031 inside XEN. I'll give a 
> try.

Just a follow up question, emulating PL031 in xen, do you have idea how to 
inject virtual interrupt to domu?
The interrupt should be only cpu interface interrupt, I think.

Thanks,
Peng.
> 
> Thanks,
> Peng.
> 
> >
> > Cheers,
> >
> > --
> > Julien Grall
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