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" <[email protected]>

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



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