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SubjectRe: [PATCH] abstract out bits of ldt.c
Chris Wright wrote:

>* Zachary Amsden (zach@vmware.com) wrote:
>
>
>>Does Xen assume page aligned descriptor tables? I assume from this
>>
>>
>
>Yes.
>
>
>
>>patch and snippets I have gathered from others, that is a yes, and other
>>things here imply that DT pages are not shadowed. If so, Xen itself
>>must have live segments in the GDT pages, so how do you allocate space
>>for the per-CPU GDT pages on SMP?
>>
>>
>
>early during boot.
>
>

Doesn't that require 16 pages per CPU? That seems excessive to impose
on a native build. Perhaps we could get away with 1 page per CPU for
the GDT on native boots and bump that up to 16 if compiling for a
virtualized sub-architecture - i.e. move GDT to a page aligned struct
for native (doesn't cost too much), and give it MACH_GDT_PAGES of space
which is defined by the sub-architecture.

Let's take this thread over to virtualization@lists.osdl.org as well.

Zach
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