Re: [Qemu-devel] [PATCH 0/4] Support more than 255 cpus

[Li, ZhenHua]

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" <address@hidden>
> >
> > 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