[Starlingx-discuss] cpu mode

[Arevalo, Mario Alfredo C]

Hi Volker,

Could you please send me the QEMU command line used to launch your VM, this is in
order to check the QEMU arguments/flags, possibly it requires "-cpu host" argument.

Thanks.

Best regards.
Mario.


From: von Hoesslin, Volker [Volker.Hoesslin at swsn.de]

Sent: Thursday, January 17, 2019 8:23 AM

To: starlingx-discuss at lists.starlingx.io

Subject: Re: [Starlingx-discuss] cpu mode






it is impossible to set a EPIC (or any other AMD) as guest CPU?




$ openstack flavor set --property hw:cpu_model=EPYC-IBPB 76609f7b-f0c7-48ca-8c8a-f78481e62cd4
Failed to set flavor property: Invalid hw:cpu_model 'EPYC-IBPB', must be one of: Passthrough, Conroe, Penryn, Nehalem, Westmere, SandyBridge, IvyBridge, Haswell, Broadwell-noTSX, Broadwell, Skylake-Client, Skylake-Server. (HTTP 400) (Request-ID: req-2fda19cc-8e0e-4be8-a8ea-b58fc00358ce)
Command Failed: One or more of the operations failed



but my compute node seems to support EPIC CPUs?



cat /usr/share/libvirt/cpu_map/x86_EPYC-IBRS.xml




<cpus>
  <model name='EPYC-IBPB'>
    <signature family='23' model='1'/>
    <vendor name='AMD'/>
    <feature name='3dnowprefetch'/>
 ....
    <feature name='xsavec'/>
    <feature name='xsaveopt'/>
  </model>
</cpus>




some tips for me how to handle this?



volker...





Von: von Hoesslin, Volker [Volker.Hoesslin at swsn.de]

Gesendet: Donnerstag, 17. Januar 2019 15:50

An: starlingx-discuss at lists.starlingx.io

Betreff: [Starlingx-discuss] cpu mode






hi,
my setup has two computes nodes, every node has a dual AMD EPYC 7601 CPU config. how can i bring all the CPU features (AES, SSSE3, ...) to the guest VMs. i have tryed with some flavor-metadata but nothing realy helps, the VMs getting just a little subset
 of cpu-features.
some investigations to the kvm-settings hit me to the facts that my nova config has "cpu_model=none" !? how can i fix that and bring my AMD EPIC CPU to my nova-config?!



here is the host /proc/cpuinfo




processor       : 127
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 1
model name      : AMD EPYC 7601 32-Core Processor
stepping        : 2
microcode       : 0x8001227
cpu MHz         : 1200.000
cache size      : 512 KB
physical id     : 1
siblings        : 64
core id         : 31
cpu cores       : 32
apicid          : 127
initial apicid  : 127
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 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc art rep_good nopl nonstop_tsc extd_apicid amd_dcm aperfmperf eagerfpu pni pclmulqdq
 monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_l2 cpb hw_pstate retpoline_amd ssbd
 ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov
 succor smca
bogomips        : 4400.08
TLB size        : 2560 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14]




greez & thx,

volker...