KVM和libvirt：虚拟主机中的CPU类型错误

我们将KVM和libvirt用于6核（12 HT核）机器上进行虚拟化 .

Problem: wrong CPU type in virtual host.

使用KVM，libvirt，内核版本：

libvirt version: 0.9.8
QEMU emulator version 1.0 (qemu-kvm-1.0), Copyright (c) 2003-2008 Fabrice Bellard
Ubuntu 12.04.1 LTS
kernel: 3.2.0-32-generic x86_64

/usr/share/libvirt/cpu_map.xml不支持比Westmare更新的cpu类型 .

Do I need this kind of virtualisation of the cpu at all? 由于某些原因，我们需要在虚拟主机中获得最大的CPU性能 . 很高兴我的虚拟机中有一些服务器的i7-3930K CPU@3.20GHz内核 .

也许我们做muczh虚拟化......？

我的虚拟主机的xml看起来像： where can I set the cpu -host flag?

<domain type='kvm'>
  <name>myVirtualServer</name>
  <uuid>2344481d-f455-455e-9558</uuid>
  <description>Test-Server</description>
  <memory>4194304</memory>
  <currentMemory>4194304</currentMemory>
  <vcpu>2</vcpu>
  <cpu match='exact'>
    <model>Westmere</model>
    <vendor>Intel</vendor>
  </cpu>
  <os>
    <type arch='x86_64' machine='pc-1.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>

物理服务器的$ lscpu，带有6（12）个核心的HT

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Stepping:              7
CPU MHz:               1200.000
BogoMIPS:              6400.05
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              12288K
NUMA node0 CPU(s):     0-11

$ lscpu的虚拟服务器（错误的CPU类型，错误的L2缓存，错误的MHz）

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             2
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 15
Stepping:              11
CPU MHz:               3200.012
BogoMIPS:              6400.02
Virtualisation:        VT-x
Hypervisor vendor:     KVM
Virtualisation type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K
NUMA node0 CPU(s):     0,1