[Xen-devel] Re: [PATCH 25 of 38] xen mtrr: Add mtrr_ops support for Xen mtrr

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Mark McLoughlin wrote:
> On Thu, 2008-11-13 at 11:10 -0800, Jeremy Fitzhardinge wrote:
>
>   
> > diff --git a/arch/x86/kernel/cpu/mtrr/xen.c b/arch/x86/kernel/cpu/mtrr/xen.c
> > new file mode 100644
> > --- /dev/null
> > +++ b/arch/x86/kernel/cpu/mtrr/xen.c
> > @@ -0,0 +1,59 @@
> >     
> ...
>   
> > +
> > +/* DOM0 TODO: Need to fill in the remaining mtrr methods to have full
> > + * working userland mtrr support. */
> > +static struct mtrr_ops xen_mtrr_ops = {
> > +       .vendor            = X86_VENDOR_UNKNOWN,
> > +//     .set               = xen_set_mtrr,
> > +//     .get               = xen_get_mtrr,
> > +       .get_free_region   = generic_get_free_region,
> > +//     .validate_add_page = xen_validate_add_page,
> > +       .have_wrcomb       = positive_have_wrcomb,
> > +       .use_intel_if      = 0,
> > +       .num_var_ranges    = xen_num_var_ranges,
> > +};
> >     
> ...
>
> I'm vague on the details now, but looking back at the dom0 patch set
> here:
>
> http://git.et.redhat.com/?p=linux-2.6-dom0-pvops.git;a=shortlog;h=55abc194080b5cf31cd66f5e35e8e5c5af2aa927
>
> I see we did have a bunch more mtrr work e.g. fixing the TODO above:
>
> http://git.et.redhat.com/?p=linux-2.6-dom0-pvops.git;a=commitdiff;h=93f779bf3d79f28d0933bfbc53f7b8c5b6496081
>   
Yes, the mtrr changes are incomplete.  I started on them as much as 
necessary to get things booting, and then left the rest to revisit.  
It's not a particularly pretty part of the kernel, and so I was hoping 
some magic beautification fairy would visit it before I needed to touch 
it more...
   J

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