Messages in this thread | | | Date | Fri, 28 Sep 2012 08:56:50 +0100 | From | "Jan Beulich" <> | Subject | Re: [PATCH 02/11] x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE |
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>>> 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.
Jan
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