Messages in this thread | | | Date | Mon, 1 Oct 2012 15:01:51 +0200 | From | Daniel Kiper <> | Subject | Re: [PATCH 02/11] x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE |
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On Fri, Sep 28, 2012 at 08:56:50AM +0100, Jan Beulich wrote: > >>> On 27.09.12 at 20:06, Daniel Kiper <daniel.kiper@oracle.com> wrote: > > Some implementations (e.g. Xen PVOPS) could not use part of identity page > > table to construct transition page table. It means that they require separate > > PUDs, PMDs and PTEs for virtual and physical (identity) mapping. To satisfy that > > requirement add extra pointer to PGD, PUD, PMD and PTE and align existing > > code. > > I'm puzzled by this - why would you need to reintroduce what had > been dropped a long time ago, when the forward ported kernels > don't need it? Xen itself doesn't need the extra entries, their > presence is purely a requirement of the specific kernel > implementation afaict.
Hmmm... I will try to optimize that a bit.
Daniel
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