Re: [Qemu-devel] [PATCH RFC 6/6] target-i386: make cpus childs of /machine

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2012-05-21 11:50, Igor Mammedov wrote:
>> I've used cpu_index, but it seems cpuid_apic_id is assigned only once,
>> from cpu_index, so it should be identical. What's the difference?
> Once Jan voiced that user visible cpu id, should be apic_id in context of cpu hotplug
> (i.e. when doing: device_add xxx_cpu,id=12345,...)
>    "Jan, please correct me if I've got you wrong."
> So QOM tree probably should reflect this id and not cpu_index.
> 
> However cpu_index and apic_id are the same now and bios assumes it as well.
> What are possible benefits of using cpuid_apic_id != cpu_index for qemu?

>From my POV, cpu_index could become equal to the physical APIC ID. As
long as we can set it freely (provided it remains unique) and
non-continuously, we don't need separate indexes.

Jan

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