Re: [PATCH v4 04/14] x86/rtc: replace paravirt rtc check with platform legacy quirk

[Boris Ostrovsky]

On 04/08/2016 03:59 AM, Juergen Gross wrote:
> On 08/04/16 09:36, Luis R. Rodriguez wrote:
> > On Fri, Apr 8, 2016 at 12:13 AM, Juergen Gross <jgross@xxxxxxxx> wrote:
> > > On 08/04/16 08:56, Luis R. Rodriguez wrote:
> > > > On Thu, Apr 7, 2016 at 11:38 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
> > > >
> > > > Okay. Another idea (not sure whether this is really a good one):
> > > >
> > > > Add X86_SUBARCH_XEN_DOM0. As hardware_subarch is 32 bits wide I don't
> > > > think the number of subarchs is a scarce resource. :-)
> > This would mean bumping the x86 boot protocol, we shouldn't take that
> > lightly, but given that in this case the new subarch would really only
> > be set by the kernel (or future loaders for perhaps HVMLite) I'd think
> > this is not such an intrusive alternative.
> I think adding an own subarch for dom0 isn't that bad. It really is
> different from domU as dom0 has per default access to the real hardware
> (or at least to most of it).

Can we do this (overwrite quirks) in x86_init_ops.arch_setup? I'd really 
like to avoid adding a what essentially is a sub-subarch.

-boris