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  1. RHEL
  2. RHEL-71930

hypervisor-cpu-baseline get unexpected result from Skylake-Server and Cascadelake-Server

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    • rhel-virt-core-libvirt-1
    • ssg_virtualization
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    • x86_64
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      What were you trying to do that didn't work?

      As subject

      What is the impact of this issue to you?

      Wrong result for `virsh hypervisor-cpu-baseline`

      Please provide the package NVR for which the bug is seen:

      libvirt-10.10.0-2.el9.x86_64
      qemu-kvm-9.1.0-7.el9.x86_64

      How reproducible is this bug?:

      100%

      Steps to reproduce

      1. Prepare the CPU xml caps_skylake_server_cascadelake_server.xml with Skylake-Server and Cascadelake-Server
      <cpu>
      <model>Skylake-Server-IBRS</model>
      ...
      </cpu>
      <cpu>
      ...
      <model>Skylake-Server-IBRS</model>
      </cpu>
      

      The run `virsh hypervisor-cpu-baseline`

      # virsh hypervisor-cpu-baseline ./caps_skylake_server_cascadelake_server.xml
      <cpu mode='custom' match='exact'>
        <model fallback='forbid'>Cascadelake-Server</model>
        <vendor>Intel</vendor>
        <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='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='tsc_adjust'/>
        <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='xsaves'/>
        <feature policy='require' name='invtsc'/>
        <feature policy='disable' name='hle'/>
        <feature policy='disable' name='rtm'/>
        <feature policy='disable' name='avx512vnni'/>
        <feature policy='disable' name='mpx'/>
      </cpu>

       

      Expected results

      Expect the model is Skylake-Server*

      Actual results

      As above

      The git-bisection shows the first bad result is:

      commit fa5459517848f333743c771e90eb01faeced3dae                     
      Author: Tim Wiederhake <twiederh@redhat.com>                  
      Date:   Fri Feb 9 11:52:56 2024 +0100                                                                                                        
                                                                                                                                                   
          cpu_map: Drop 'mpx' from x86 cpu models

              jdenemar@redhat.com Jiri Denemark
              rhn-support-hhan Han Han
              virt-maint virt-maint
              Zhen Tang Zhen Tang
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                Created:
                Updated:
                Resolved: