查看操作系统是否支持kvm嵌套

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[root@compute03 images]# cat /sys/module/kvm_intel/parameters/nested
N
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How to enable Nested virtualization in OpenStack Cloud
2 X2 q" c& M4 s4 O) _0 \% CI 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:
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* `' o0 p# w' X3 N; k2 k3 ^[root@openstack]#echo "options kvm-intel nested=y" >> /etc/modprobe.d/dist.conf
Modify the following settings in nova.conf file.
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virt_type=kvm
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- @4 K" `# y4 Ccpu_mode=host-passthrough
( _1 r& _0 J  o9 {“host-passthrough” – use the host CPU model exactly

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
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) |1 J# [1 s) K- s1 y. q+ cReboot your compute Host
Validate that nested virtualization is enable at the kernel level:
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[root@openstack]# cat /sys/module/kvm_intel/parameters/nested
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5 [2 k3 Y& X3 }8 Q. }0 ~Launch new instance on this node, and validate that your instance at the vmx cpu flag enable:
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) {! }" Q% a) X4 J[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
9 G! s9 n& w6 X& {That’s all. A new virtual machine will be running as a hypervisor.