[libvirt-users] Way to detect virtual machine cpu features

[Marko Weber | 8000]

Hi,

Am 2017-07-04 03:08, schrieb Lei Zhang:
> Hi, any comment or suggestion
> 
> On Thu, Jun 29, 2017 at 10:55 AM, Lei Zhang <lei12zhang12 at gmail.com>
> wrote:
> 
>> Hello everyone
>> 
>> I want to know how can I use libvirt to detect what cpu features a
>> virtual machine will see.
>> 
>> I guess I could do it in following way:
>> 
>> 1. if cpu mode is 'custom', use 'virsh cpu-baseline --features' on
>> the cpu model to get model features.
>> 2. if cpu mode is 'host-passthrough' or 'host-model', do a 'virsh
>> capabilities' to list cpu features of physical host, they are
>> identical to features of virtual machine.
>> 
>> Is this right way to do things? Look forward to your valuable
>> comments.
>> 
>> Best regards,
>> Lei
> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users

why dont u fire up on 'host' & 'vm'  lscpu?

lscpu in vm on our server:

  # lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    2
Core(s) per socket:    1
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 60
Model name:            Intel Core Processor (Haswell)
Stepping:              4
CPU MHz:               3595.608
BogoMIPS:              7191.21
Hypervisor vendor:     KVM     
<======================================================================================== 
  Inside a VM !!!
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K
L3 cache:              16384K
NUMA node0 CPU(s):     0,1


Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr 
pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm 
constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 fma cx16 pcid 
sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c 
rdrand hypervisor lahf_lm abm fsgsbase bmi1 hle avx2 smep bmi2 erms 
invpcid rtm xsaveopt arat

and there u see the cpu features.......



is this what u you want to see?


marko