Date: Fri, 8 Apr 2016 20:45:23 +0200
From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>, "Luis R. Rodriguez" <mcgrof@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Rusty Russell <rusty@rustcorp.com.au>, X86 ML <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andy Lutomirski <luto@amacapital.net>,
        David Vrabel <david.vrabel@citrix.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
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        lguest@lists.ozlabs.org,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Joey Lee <jlee@suse.com>, Gary Lin <glin@suse.com>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        Andrew Cooper <andrew.cooper3@citrix.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org>,
        "Moore, Robert" <robert.moore@intel.com>,
        Lv Zheng <lv.zheng@intel.com>, Toshi Kani <toshi.kani@hp.com>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        kozerkov@parallels.com, Josh Triplett <josh@joshtriplett.org>,
        Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH v4 04/14] x86/rtc: replace paravirt rtc check with
 platform legacy quirk
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On Fri, Apr 08, 2016 at 08:37:44AM -0400, Boris Ostrovsky wrote:
> 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@suse.com> wrote:
> >>>On 08/04/16 08:56, Luis R. Rodriguez wrote:
> >>>>On Thu, Apr 7, 2016 at 11:38 PM, Juergen Gross <jgross@suse.com> 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.

I'm going with this. Will respin.

  Luis