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

[Julien Grall <julien.grall@xxxxxxx>]

On 11/1/18 3:37 AM, Peng Fan wrote:
> Hi Julien,
Hi Peng,


> > -----Original Message-----
> > From: Julien Grall [mailto:julien.grall@xxxxxxx]
> > Sent: 2018年11月1日 2:52
> > To: Peng Fan <peng.fan@xxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx; Stefano
> > Stabellini <sstabellini@xxxxxxxxxx>
> > Subject: Re: Does XEN ARM support RTC in domu?
> >
> >
> >
> > On 10/31/18 1:57 PM, Peng Fan wrote:
> > > Hi All,
> > Hi,
> >
> > > 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.
Cheers,

--
Julien Grall

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