Re: [Xen-devel] [PATCH][v2] Hybrid extension support in Xen

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 02/02/2010 13:37, "Sheng Yang" <sheng@xxxxxxxxxxxxxxx> wrote:

>>> 1. Enable SMP support through VCPU_OP in arch_set_info_guest().
>> 
>> What does that mean and why would we want it?
> 
> It's not a good description, sorry... We need a entry address and boot up code
> AP. For that purpose, I reuse VCPUOP_initialise and VCPUOP_up hypercall. The
> former guest set the entry address of AP, the later one boot up them. For
> this, I add some code in arch_set_info_guest() to initialize the AP(mostly
> what we did after INIT-SIPI-SIPI sequence), that's what I means here...

Okay, so that leads to the obvious next question: why do you want to avoid
using INIT-SIPI-SIPI?

 -- Keir



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