Chris Wright wrote:
* Zachary Amsden ([email protected]) 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 [email protected] as well.
Zach
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