From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: Xen's Linux kernel config options V2
Date: Wed, 4 Feb 2015 15:06:45 +0000
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To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Juergen Gross <jgross@suse.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, David Vrabel <david.vrabel@citrix.com>, Jan Beulich <JBeulich@suse.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>
List-Id: xen-devel@lists.xenproject.org

On Wed, 4 Feb 2015, Ian Campbell wrote:
> On Wed, 2015-02-04 at 14:57 +0000, Stefano Stabellini wrote:
> > On Wed, 4 Feb 2015, David Vrabel wrote:
> > > On 16/12/14 16:21, Juergen Gross wrote:
> > > > Hi,
> > > > 
> > > > This is a design proposal for a rework of the config options on the
> > > > Linux kernel which are related to Xen.
> > > > 
> > > > The need to do so arose from the fact that it is currently not
> > > > possible to build the Xen frontend drivers for a non-pvops kernel,
> > > > e.g. to run them in a HVM-domain. There are more drawbacks in the
> > > > current config options to which I'll come later.
> > > > 
> > > > Option                          Selects                 Depends
> > > > ----------------------------------------------------------------------
> > > > XEN
> > > >   XEN_PV(x86)                   XEN_HAVE_PVMMU
> > > >                                 PARAVIRT
> > > >                                 PARAVIRT_CLOCK
> > > >   XEN_PVH(x86)                  XEN_PVHVM
> > > >                                 PARAVIRT  
> > > >                                 PARAVIRT_CLOCK
> > > >   XEN_PVHVM                     PARAVIRT
> > > >                                 PARAVIRT_CLOCK
> > 
> > PARAVIRT_CLOCK and PARAVIRT are x86 specific.
> 
> Does PARAVIRT_CLOCK include the pvclock_read_wallclock stuff? Eventually
> we are going to want that functionality on ARM too, although it's not
> clear to me that bundling pv-wallclock and pv-cyclecounter in
> arch/x86/kernel/pvclock.c under the same config option is most correct.
 
Agreed.  Also that patch series never went upstream unfortunately.