Re: [Xen-devel] [PATCH] Fixing PAE SMP dom0 hang at boot time

[Ryan Harper <ryanh@xxxxxxxxxx>]

* Nakajima, Jun <jun.nakajima@xxxxxxxxx> [2005-11-15 19:56]:
> This patch fixes a hang with PAE SMP dom0 on big SMP machines. As far as
> I tested, 8-way PAE SMP dom0 boots fine on >=8-way machines. The fix is
> not PAE specific, and I made the equivent changes to x86_64 xenlinux.
> Tested on both PAE and x86_64 dom0 xenlinux on >=8-way SMP machines with
> >6GB.

Jun,  could you explain the patch a bit more?  

Why wouldn't we want to initialize the per-cpu gdt area for cpus other
than CPU0 ?

-       cpu_gdt_init(&cpu_gdt_descr[cpu]);
+       if (!cpu)
+           cpu_gdt_init(&cpu_gdt_descr[cpu]);


And why would we need to take interrupts between loading esp0 and LDT?

        load_esp0(t, thread);

+       local_irq_enable();
+
        load_LDT(&init_mm.context);


-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@xxxxxxxxxx

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