Re: [Xen-devel] Re: x86_64 SMP support (status update)

[Chris Wright <chrisw@xxxxxxxx>]

* Keir Fraser (Keir.Fraser@xxxxxxxxxxxx) wrote:
> Xen makes a shadow mapping of the per-vcpu gdt in its own address 
> space. This, coupled with Xen reserving the last 2 pages of GDT entries 
> for itself, requires every GDT to start on a page boundary. So, even 
> though per-cpu gdts are not page-aligned they must be at least one page 
> in size.

ah, thanks!  i should've realized that.  at one point i moved the
cpu_gdt_table, and it was no longer page aligned (nor was it a page long)
and vcpu 0 wouldn't come up any longer.  making sure it was aligned
and on it's own page got the first cpu going again...didn't think to
generalize that ;-)

thanks,
-chris

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