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Date: Thu, 15 May 2014 15:16:03 +0800
From: "Li, ZhenHua" <zhen-hual@hp.com>
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Subject: Re: [Qemu-devel] [PATCH 0/4] Support more than 255 cpus
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Igor Mammedov <imammedo@redhat.com>, qemu-devel@nongnu.org, Eduardo Habkost <ehabkost@redhat.com>

Kernel's kvm support is not here.
x2APIC is needed, I will try to do that later.

On 05/13/2014 06:53 PM, Jan Kiszka wrote:
> On 2014-05-13 09:09, Li, Zhen-Hua wrote:
>> From: "Li, ZhenHua" <zhen-hual@hp.com>
>>
>> These series patches are trying to make Qemu support more than 255 CPUs.
>> The max cpu number changed to 4096.
>>
>>   Support more than 255 cpus: ACPI and APIC defines
>>   Support more than 255 cpus: max_cpus to 4096
>>   Support more than 255 cpus: max cpumask bit to 4096
>>   Support more than 255 cpus: runtime chec
>>
>>   include/hw/acpi/cpu_hotplug_defs.h | 4 ++--
>>   include/hw/i386/apic_internal.h    | 2 +-
>>   include/hw/i386/pc.h | 2 +-
>>   include/sysemu/sysemu.h | 2 +-
>>   hw/i386/acpi-build.c | 8 ++++----
> Don't we need x2APIC support to provide >255 CPUs? Where so you enforce
> this, i.e. keep the restriction to 255 CPUs when we are not in KVM mode
> with in-kernel APIC (the emulate APIC lacks x2APIC mode, unfortunately)?
> But, wait, KVM only supports up to 255 VCPUs. So what are you targeting at?
>
> Jan
>