Re: [Xen-devel] [PATCH 02/11] x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.09.12 at 20:06, Daniel Kiper <daniel.kiper@xxxxxxxxxx> 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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel