查看操作系统是否支持kvm嵌套

admin

[root@compute03 images]# cat /sys/module/kvm_intel/parameters/nested
/ u6 y$ M$ t% n2 u4 i% ^N
  g& s0 m" y' c4 p- s$ H

admin

How to enable Nested virtualization in OpenStack Cloud
* g1 d9 T0 v# U  h1 G% |* G: G! eI have installed OpenStack using PackStack in our physical server. After successfully installed, verified that the setup is working fine.
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We need to enable nested virtualization OpenStack cloud at the kernel level:

[root@openstack]#echo "options kvm-intel nested=y" >> /etc/modprobe.d/dist.conf
8 Z% ]" V5 ~2 A0 y, z% JModify the following settings in nova.conf file.
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3 Z! @8 r. |! [* Gvirt_type=kvm
  y1 U" H0 g3 x% Y) D...
! ]2 C% r# n7 t, E+ |5 Wcpu_mode=host-passthrough
“host-passthrough” – use the host CPU model exactly
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this causes libvirt to tell KVM to passthrough the host CPU with no modifications. The difference to host-model, instead of just matching feature flags, every last detail of the host CPU is matched.

“host-model” –  clone the host CPU feature flags

5 a4 P5 g' {1 q# XReboot your compute Host
; T$ U- o2 r7 b% @/ OValidate that nested virtualization is enable at the kernel level:

[root@openstack]# cat /sys/module/kvm_intel/parameters/nested
Y
  g% j$ l5 ]# `6 k) ILaunch new instance on this node, and validate that your instance at the vmx cpu flag enable:

[root@nested ~]# cat /proc/cpuinfo | grep vmx
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm tpr_shadow vnmi flexpriority ept fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm tpr_shadow vnmi flexpriority ept fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt
That’s all. A new virtual machine will be running as a hypervisor.