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Re: [Qemu-devel] [RFC 0/7+1] QEMU APIC ID + topology bug + CPU hotplug

From: Gleb Natapov
Subject: Re: [Qemu-devel] [RFC 0/7+1] QEMU APIC ID + topology bug + CPU hotplug
Date: Thu, 12 Jul 2012 17:00:11 +0300

On Thu, Jul 12, 2012 at 03:51:48PM +0200, Igor Mammedov wrote:
> On 07/10/2012 10:22 PM, Eduardo Habkost wrote:
> >The hotplug case is a bit more complex: we need to either:
> >  - have a mechanism to let the ACPI SSDT code know what's the APIC ID of
> >    hotplugged CPUs; or
> >  - make Seabios run some code in the hotplugged CPU (I am assuming that 
> > this is
> >    simply not possible).
> If SMM is supported by qemu/kvm than it will be possible to trigger SMI from
> APCI method and SMI handler, that are supposed to run on all CPUs (including 
> hot-plugged one)
> , could fixup APIC ID of added CPU in some memory region used by ACPI.
SMM is not supported (arguably is should not be supported on real HW
too), but even if it was default SMM address is 0x38000 IIRC and it is a
middle of a memory and can be used by a guest OS.


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