Re: [Xen-devel] [PATCH v2 3/3] paravirt: rename paravirt_enabled to paravirt_legacy

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 02/17/2016 03:49 PM, Borislav Petkov wrote:
> On Wed, Feb 17, 2016 at 12:07:13PM -0800, Luis R. Rodriguez wrote:
> > OK so here's a wiki to keep track of progress of the difference uses:
> >
> > http://kernelnewbies.org/KernelProjects/remove-paravirt-enabled
> >
> > It seems we have a resolution one way or another for all except for
> > the use on arch/x86/mm/dump_pagetables.c, is that right?
> Why not?
>
> I think we should simply check the range as ffff800000000000 -
> ffff87ffffffffff is practically an ABI and nothing should be mapped
                                                    ^^^^^^^^^

That's exactly the point: if something is mapped it's an error for a 
non-PV kernel.
By removing paravirt_enabled() we may miss those errors. Worse, I think 
we may even crash while doing pagetable walk (although it's probably 
better to crash here than to use an unexpected translation in real code 
somewhere)
-boris


> there anyway. No need for paravirt_enabled() there either.

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