https://docs.openstack.org/mitaka/config-reference/compute/hypervisor-kvm.html
HOST
# cat /sys/module/kvm_amd/parameters/nested
1
- libvirt_cpu_mode = custom|host-model|host-passthrough
nova.conf
[libvirt]
.........
cpu_mode = host-passthrough
## host cpu 플래그를 그대로...
cpu_mode = custom|host-model|host-passthrough
default = host-model
host-model
# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 21
model : 2
model name : AMD Opteron 63xx class CPU
stepping : 0
microcode : 0x1000065
cpu MHz : 3314.660
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb lm rep_good nopl extd_apicid pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic popcnt aes xsave avx f16c hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw xop fma4 tbm vmmcall bmi1 arat
bugs : fxsave_leak sysret_ss_attrs
bogomips : 6629.32
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
host-passthrough
# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 21
model : 2
model name : AMD FX(tm)-8300 Eight-Core Processor
stepping : 0
microcode : 0x1000065
cpu MHz : 3314.660
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb lm rep_good nopl extd_apicid pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c hypervisor lahf_lm cmp_legacy svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw xop fma4 tbm vmmcall tsc_adjust bmi1 arat npt nrip_save
bugs : fxsave_leak sysret_ss_attrs
bogomips : 6629.32
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
qemu
-cpu host
-cpu Opteron_G5,+bmi1,+perfctr_nb,+perfctr_core,+topoext,+nodeid_msr,+tce,+lwp,+wdt,+skinit,+ibs,+osvw,+cr8legacy,+extapic,+cmp_legacy,+fxsr_opt,+mmxext,+osxsave,+monitor,+ht,+vme
cpu_mode = custom
cpu_model = Opteron_G4
-cpu Opteron_G4
cpu_mode = custom
cpu_model = Nehalem
-cpu Nehalem
# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 26
model name : Intel Core i7 9xx (Nehalem Class Core i7)
stepping : 3
microcode : 0x1000065
cpu MHz : 3314.660
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm nopl pni ssse3 cx16 sse4_1 sse4_2 x2apic popcnt hypervisor lahf_lm 3dnowprefetch vmmcall
bugs : fxsave_leak sysret_ss_attrs
bogomips : 6629.32
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
