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
3 @0 U) ]. l- A$ W. h, mI 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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, x" \2 A$ {, b7 j; M$ p# g  Z; T[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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cpu_mode=host-passthrough
% w) S' C" |+ Y4 q* i1 z& {2 b/ b0 U“host-passthrough” – use the host CPU model exactly
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0 F, |# t# X# {7 J- g' Pthis 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.

9 {8 _/ g; y# H. I: @“host-model” –  clone the host CPU feature flags

Reboot 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
Y
- q7 D; Z& p7 ?: t8 R1 BLaunch new instance on this node, and validate that your instance at the vmx cpu flag enable:
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[root@nested ~]# cat /proc/cpuinfo | grep vmx
: }" K- H( v8 q& f& k1 }! Cflags : 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.