Ubuntu
qemu package

  1. Disco (19.04)
  2. Bug #1825195
  3. Comment #0

Comment 0 for bug 1825195

Revision history for this message
Christian Ehrhardt  (paelzer) wrote : qemu lost osxsave feature bit (ok) which might cause upgrade issues (not so ok)

There seem to be conditions where old qemu/libvirt created guests with the osxsafe feature

    <model fallback='allow'>Broadwell-noTSX</model>
    <vendor>Intel</vendor>
...
    <feature policy='require' name='osxsave'/>

That feature was now removed in recent qemu.
  => https://bugzilla.redhat.com/show_bug.cgi?id=1644848

But its lack might cause issues starting some old guests using it after upgrade.
  qemu-system-x86_64: can't apply global Broadwell-noTSX-x86_64-cpu.osxsave=on: Property '.osxsave' not found

I'd want to analyze omre of the background, why we have it in our IBRS type (still it seems) and if we can make modifications to make the transition more smooth.