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

[Chris Wright <chrisw@xxxxxxxx>]

* Nakajima, Jun (jun.nakajima@xxxxxxxxx) wrote:
> Chris Wright wrote:
> > Here's an updated patch that fixes that faulting.  It uses gdt per
> > page like i386 is doing, still crashing upon schedule.  Why does each
> > gdt entry need it's own page?
> 
> Each gdt entry? I think gdt should be per vcpu, but I don't understand
> "each gdt entry". Can you please point to the code you are talking
> about?

Yes, the table is in arch/xen/x86_64/kernel/head.S (cpu_gdt_table, which
has 16 8 byte entries per cpu).  However rather than using that table directly,
we must copy the entries into a per cpu page.  Xen side has assumptions
regarding gdt being page sized (8 bytes * 512 entries, e.g. in
xen/arch/x86/mm.c in alloc_segdesc_page).  That help?

thanks,
-chris

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