Bug 2084030

Summary: When doing a cpu-baseline between skylake and cascadelake, cascadelake is selected as baseline. [rhel-8.6.0.z]
Product: Red Hat Enterprise Linux 8 Reporter: RHEL Program Management Team <pgm-rhel-tools>
Component: libvirtAssignee: Jiri Denemark <jdenemar>
Status: CLOSED ERRATA QA Contact: Luyao Huang <lhuang>
Severity: high Docs Contact:
Priority: high    
Version: 8.5CC: chhu, cmayapka, dhill, dyuan, fdeutsch, fgadkano, fjin, gveitmic, jdenemar, jsuchane, kchamart, lhuang, lmen, mkalinin, virt-maint, xuzhang, yalzhang, ymankad
Target Milestone: rcKeywords: AutomationBackLog, Triaged, Upstream, ZStream
Target Release: ---   
Hardware: x86_64   
OS: All   
Whiteboard:
Fixed In Version: libvirt-8.0.0-5.2.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1851227 Environment:
Last Closed: 2022-08-02 10:01:20 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1851227, 2151852    
Bug Blocks:    

Comment 4 Luyao Huang 2022-05-23 07:54:42 UTC 
Verify this bug with libvirt-daemon-8.0.0-5.2.module+el8.6.0+15256+3a0914fe.x86_64:

1. prepare a xml file which combined by virsh capabilities output collected from skylake and cascadelake:

# cat caps.xml

    <cpu>
      <arch>x86_64</arch>
      <model>Skylake-Server-IBRS</model>
      <vendor>Intel</vendor>
      <microcode version='33554537'/>
      <counter name='tsc' frequency='2600005000' scaling='yes'/>
      <topology sockets='1' dies='1' cores='12' threads='2'/>
      <feature name='ds'/>
      <feature name='acpi'/>
      <feature name='ss'/>
      <feature name='ht'/>
      <feature name='tm'/>
      <feature name='pbe'/>
      <feature name='dtes64'/>
      <feature name='monitor'/>
      <feature name='ds_cpl'/>
      <feature name='vmx'/>
      <feature name='smx'/>
      <feature name='est'/>
      <feature name='tm2'/>
      <feature name='xtpr'/>
      <feature name='pdcm'/>
      <feature name='dca'/>
      <feature name='osxsave'/>
      <feature name='tsc_adjust'/>
      <feature name='cmt'/>
      <feature name='clflushopt'/>
      <feature name='intel-pt'/>
      <feature name='pku'/>
      <feature name='ospke'/>
      <feature name='md-clear'/>
      <feature name='stibp'/>
      <feature name='ssbd'/>
      <feature name='xsaves'/>
      <feature name='mbm_total'/>
      <feature name='mbm_local'/>
      <feature name='invtsc'/>
      <pages unit='KiB' size='4'/>
      <pages unit='KiB' size='2048'/>
      <pages unit='KiB' size='1048576'/>
    </cpu>

    <cpu>
      <arch>x86_64</arch>
      <model>Cascadelake-Server</model>
      <vendor>Intel</vendor>
      <microcode version='83886124'/>
      <counter name='tsc' frequency='2099999000' scaling='yes'/>
      <topology sockets='1' dies='1' cores='20' threads='2'/>
      <feature name='ds'/>
      <feature name='acpi'/>
      <feature name='ss'/>
      <feature name='ht'/>
      <feature name='tm'/>
      <feature name='pbe'/>
      <feature name='dtes64'/>
      <feature name='monitor'/>
      <feature name='ds_cpl'/>
      <feature name='vmx'/>
      <feature name='smx'/>
      <feature name='est'/>
      <feature name='tm2'/>
      <feature name='xtpr'/>
      <feature name='pdcm'/>
      <feature name='dca'/>
      <feature name='osxsave'/>
      <feature name='tsc_adjust'/>
      <feature name='cmt'/>
      <feature name='intel-pt'/>
      <feature name='pku'/>
      <feature name='ospke'/>
      <feature name='md-clear'/>
      <feature name='stibp'/>
      <feature name='arch-capabilities'/>
      <feature name='xsaves'/>
      <feature name='mbm_total'/>
      <feature name='mbm_local'/>
      <feature name='invtsc'/>
      <feature name='rdctl-no'/>
      <feature name='ibrs-all'/>
      <feature name='skip-l1dfl-vmentry'/>
      <feature name='mds-no'/>
      <feature name='tsx-ctrl'/>
      <pages unit='KiB' size='4'/>
      <pages unit='KiB' size='2048'/>
      <pages unit='KiB' size='1048576'/>
    </cpu>

2. run cpu-baseline command with this xml file and Skylake-Server-IBRS is selected as baseline
# virsh cpu-baseline caps.xml 
<cpu mode='custom' match='exact'>
  <model fallback='allow'>Skylake-Server-IBRS</model>
  <vendor>Intel</vendor>
  <feature policy='require' name='ds'/>
  <feature policy='require' name='acpi'/>
  <feature policy='require' name='ss'/>
  <feature policy='require' name='ht'/>
  <feature policy='require' name='tm'/>
  <feature policy='require' name='pbe'/>
  <feature policy='require' name='dtes64'/>
  <feature policy='require' name='monitor'/>
  <feature policy='require' name='ds_cpl'/>
  <feature policy='require' name='vmx'/>
  <feature policy='require' name='smx'/>
  <feature policy='require' name='est'/>
  <feature policy='require' name='tm2'/>
  <feature policy='require' name='xtpr'/>
  <feature policy='require' name='pdcm'/>
  <feature policy='require' name='dca'/>
  <feature policy='require' name='tsc_adjust'/>
  <feature policy='require' name='clflushopt'/>
  <feature policy='require' name='intel-pt'/>
  <feature policy='require' name='pku'/>
  <feature policy='require' name='md-clear'/>
  <feature policy='require' name='stibp'/>
  <feature policy='require' name='ssbd'/>
  <feature policy='require' name='xsaves'/>
  <feature policy='require' name='invtsc'/>
</cpu>



3. run hypervisor-cpu-baseline command with this xml file and Skylake-Server-IBRS is selected as baseline

# virsh hypervisor-cpu-baseline caps.xml
<cpu mode='custom' match='exact'>
  <model fallback='forbid'>Skylake-Client-IBRS</model>
  <vendor>Intel</vendor>
  <feature policy='require' name='ds'/>
  <feature policy='require' name='acpi'/>
  <feature policy='require' name='ss'/>
  <feature policy='require' name='ht'/>
  <feature policy='require' name='tm'/>
  <feature policy='require' name='pbe'/>
  <feature policy='require' name='dtes64'/>
  <feature policy='require' name='monitor'/>
  <feature policy='require' name='ds_cpl'/>
  <feature policy='require' name='vmx'/>
  <feature policy='require' name='smx'/>
  <feature policy='require' name='est'/>
  <feature policy='require' name='tm2'/>
  <feature policy='require' name='xtpr'/>
  <feature policy='require' name='pdcm'/>
  <feature policy='require' name='dca'/>
  <feature policy='require' name='tsc_adjust'/>
  <feature policy='require' name='avx512f'/>
  <feature policy='require' name='avx512dq'/>
  <feature policy='require' name='clflushopt'/>
  <feature policy='require' name='clwb'/>
  <feature policy='require' name='intel-pt'/>
  <feature policy='require' name='avx512cd'/>
  <feature policy='require' name='avx512bw'/>
  <feature policy='require' name='avx512vl'/>
  <feature policy='require' name='pku'/>
  <feature policy='require' name='md-clear'/>
  <feature policy='require' name='stibp'/>
  <feature policy='require' name='ssbd'/>
  <feature policy='require' name='xsaves'/>
  <feature policy='require' name='pdpe1gb'/>
  <feature policy='require' name='invtsc'/>
</cpu>



4. similarly, prepare a xml file which combined by virsh domcapabilities output collected from skylake and cascadelake, and run hypervisor-cpu-baseline with this xml file:

# cat domcaps.xml 
...
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Skylake-Client-IBRS</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='pdcm'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='clflushopt'/>
      <feature policy='require' name='umip'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='arch-capabilities'/>
      <feature policy='require' name='ssbd'/>
      <feature policy='require' name='xsaves'/>
      <feature policy='require' name='pdpe1gb'/>
      <feature policy='require' name='invtsc'/>
      <feature policy='require' name='ibpb'/>
      <feature policy='require' name='ibrs'/>
      <feature policy='require' name='amd-stibp'/>
      <feature policy='require' name='amd-ssbd'/>
      <feature policy='require' name='rsba'/>
      <feature policy='require' name='skip-l1dfl-vmentry'/>
      <feature policy='require' name='pschange-mc-no'/>
    </mode>
...
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Cascadelake-Server</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='umip'/>
      <feature policy='require' name='pku'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='arch-capabilities'/>
      <feature policy='require' name='xsaves'/>
      <feature policy='require' name='invtsc'/>
      <feature policy='require' name='ibpb'/>
      <feature policy='require' name='amd-ssbd'/>
      <feature policy='require' name='rdctl-no'/>
      <feature policy='require' name='ibrs-all'/>
      <feature policy='require' name='skip-l1dfl-vmentry'/>
      <feature policy='require' name='mds-no'/>
      <feature policy='require' name='pschange-mc-no'/>
      <feature policy='require' name='tsx-ctrl'/>
    </mode>
...

# virsh hypervisor-cpu-baseline domcaps.xml 
<cpu mode='custom' match='exact'>
  <model fallback='forbid'>Skylake-Client-IBRS</model>
  <vendor>Intel</vendor>
  <feature policy='require' name='ss'/>
  <feature policy='require' name='vmx'/>
  <feature policy='require' name='hypervisor'/>
  <feature policy='require' name='tsc_adjust'/>
  <feature policy='require' name='clflushopt'/>
  <feature policy='require' name='umip'/>
  <feature policy='require' name='md-clear'/>
  <feature policy='require' name='stibp'/>
  <feature policy='require' name='arch-capabilities'/>
  <feature policy='require' name='ssbd'/>
  <feature policy='require' name='xsaves'/>
  <feature policy='require' name='pdpe1gb'/>
  <feature policy='require' name='invtsc'/>
  <feature policy='require' name='ibpb'/>
  <feature policy='require' name='amd-ssbd'/>
  <feature policy='require' name='skip-l1dfl-vmentry'/>
  <feature policy='require' name='pschange-mc-no'/>
</cpu>

# cat domcaps2.xml
...
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Skylake-Server-IBRS</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='clflushopt'/>
      <feature policy='require' name='umip'/>
      <feature policy='require' name='pku'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='ssbd'/>
      <feature policy='require' name='xsaves'/>
      <feature policy='require' name='invtsc'/>
    </mode>
...

...
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Cascadelake-Server</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='umip'/>
      <feature policy='require' name='pku'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='arch-capabilities'/>
      <feature policy='require' name='xsaves'/>
      <feature policy='require' name='invtsc'/>
      <feature policy='require' name='ibpb'/>
      <feature policy='require' name='amd-ssbd'/>
      <feature policy='require' name='rdctl-no'/>
      <feature policy='require' name='ibrs-all'/>
      <feature policy='require' name='skip-l1dfl-vmentry'/>
      <feature policy='require' name='mds-no'/>
      <feature policy='require' name='pschange-mc-no'/>
      <feature policy='require' name='tsx-ctrl'/>
    </mode>
...

# virsh hypervisor-cpu-baseline domcaps2.xml
<cpu mode='custom' match='exact'>
  <model fallback='forbid'>Skylake-Client-IBRS</model>
  <vendor>Intel</vendor>
  <feature policy='require' name='ss'/>
  <feature policy='require' name='hypervisor'/>
  <feature policy='require' name='tsc_adjust'/>
  <feature policy='require' name='avx512f'/>
  <feature policy='require' name='avx512dq'/>
  <feature policy='require' name='clflushopt'/>
  <feature policy='require' name='clwb'/>
  <feature policy='require' name='avx512cd'/>
  <feature policy='require' name='avx512bw'/>
  <feature policy='require' name='avx512vl'/>
  <feature policy='require' name='umip'/>
  <feature policy='require' name='pku'/>
  <feature policy='require' name='md-clear'/>
  <feature policy='require' name='stibp'/>
  <feature policy='require' name='ssbd'/>
  <feature policy='require' name='xsaves'/>
  <feature policy='require' name='pdpe1gb'/>
  <feature policy='require' name='invtsc'/>
</cpu>
Comment 13 errata-xmlrpc 2022-08-02 10:01:20 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:5821