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
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How to enable Nested virtualization in OpenStack Cloud
I have installed OpenStack using PackStack in our physical server. After successfully installed, verified that the setup is working fine.

7 n9 L4 P3 i/ I7 O; d, w; HWe need to enable nested virtualization OpenStack cloud at the kernel level:
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/ Z7 r. G, e, u. {  r  m. U2 s[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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& `! J: h% m2 k+ h) s- E6 y. Xvirt_type=kvm
: `+ o9 I# p$ A- K. o3 k* L...
' h  x2 s- W# E  L/ pcpu_mode=host-passthrough
( `2 G2 J% O' _8 S% `( g' w! W“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.

7 D' t! Q+ B* C# |“host-model” –  clone the host CPU feature flags
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! ~# J5 s) H1 P( }" @9 P% R$ TReboot your compute Host
Validate that nested virtualization is enable at the kernel level:

; k3 A: M8 v* @" z' H8 j3 ]8 R; N[root@openstack]# cat /sys/module/kvm_intel/parameters/nested
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$ D4 w9 M5 `* T$ e. }/ M. f5 VLaunch new instance on this node, and validate that your instance at the vmx cpu flag enable:

2 o5 v- u  v2 U' H[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
( e0 t7 z1 B6 K; f: \) F7 z3 yflags : 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
+ b. U% l2 d; v1 EThat’s all. A new virtual machine will be running as a hypervisor.