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

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.


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