[Bug 1866870] Re: KVM Guest pauses after upgrade to Ubuntu 20.04

[Christian Ehrhardt ]

@Boris - in your log I've seen that you also got the Penryn cpu which I find 
odd.
"-cpu 
Penryn,vme=on,vmx=on,x2apic=on,tsc-deadline=on,xsave=on,hypervisor=on,arat=on,tsc-adjust=on,arch-capabilities=on,skip-l1dfl-vmentry=on
 \"
Assuming you also only used default I wonder how it got to that, maybe the 
reason for that is the same reason that eventually triggers the error.
But virt-manager/libvirt would usually just do a best-fit (for me 
Haswell-noTSX-IBRS).


@Boris and @tstrike Could you both please report:
$ virsh capabilities
$ virsh domcapabilities
$ sudo qemu-system-x86_64 --enable-kvm --nographic --nodefaults -S -qmp-pretty 
stdio
{"execute":"qmp_capabilities"}
{"execute":"query-cpu-definitions"}
Note: the command seems to hang as you are on QMP, then just enter the two 
commands below one by one. This will add "qemu's explanation why a given cpu is 
usable or not"

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https://bugs.launchpad.net/bugs/1866870

Title:
  KVM Guest pauses after upgrade to Ubuntu 20.04

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  Symptom:
  Error unpausing domain: internal error: unable to execute QEMU command 
'cont': Resetting the Virtual Machine is required

  Traceback (most recent call last):
    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in 
cb_wrapper
      callback(asyncjob, *args, **kwargs)
    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb
      callback(*args, **kwargs)
    File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 
66, in newfn
      ret = fn(self, *args, **kwargs)
    File "/usr/share/virt-manager/virtManager/object/domain.py", line 1311, in 
resume
      self._backend.resume()
    File "/usr/lib/python3/dist-packages/libvirt.py", line 2174, in resume
      if ret == -1: raise libvirtError ('virDomainResume() failed', dom=self)
  libvirt.libvirtError: internal error: unable to execute QEMU command 'cont': 
Resetting the Virtual Machine is required

  
  ---

  As outlined here:
  https://bugs.launchpad.net/qemu/+bug/1813165/comments/15

  After upgrade, all KVM guests are in a default pause state. Even after
  forcing them off via virsh, and restarting them the guests are paused.

  These Guests are not nested.

  A lot of diganostic information are outlined in the previous bug
  report link provided. The solution mentioned in previous report had
  been allegedly integrated into the downstream updates.

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