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


From: Christian Ehrhardt 
Subject: [Bug 1866870] Re: KVM Guest pauses after upgrade to Ubuntu 20.04
Date: Thu, 12 Mar 2020 08:34:19 -0000

Thank you @tstrike:

In your logs I see a bunch of qemu warnings right at the beginning:
2020-02-12T15:09:37.773025Z qemu-system-x86_64: warning: host doesn't support 
requested feature: MSR(48FH).vmx-exit-load-perf-global-ctrl [bit 12]
2020-02-12T15:09:37.773107Z qemu-system-x86_64: warning: host doesn't support 
requested feature: MSR(490H).vmx-entry-load-perf-global-ctrl [bit 13]
2020-02-12T15:09:37.774800Z qemu-system-x86_64: warning: host doesn't support 
requested feature: MSR(48FH).vmx-exit-load-perf-global-ctrl [bit 12]
2020-02-12T15:09:37.774821Z qemu-system-x86_64: warning: host doesn't support 
requested feature: MSR(490H).vmx-entry-load-perf-global-ctrl [bit 13]
2020-02-12T15:09:38.024821Z qemu-system-x86_64: warning: Unknown firmware file 
in legacy mode: etc/msr_feature_control

And then a crash like:
KVM internal error. Suberror: 1
emulation failure
EAX=00000000 EBX=00000000 ECX=000086d4 EDX=00000000
ESI=00000000 EDI=00000000 EBP=000086d4 ESP=00006d7c
EIP=00007acf EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 00000000 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =0000 00000000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     000f6200 00000037
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=b8 90 d9 00 00 66 e8 6b f7 ff ff 66 b8 0a 00 00 00 e9 61 f2 <f3> 0f 1e fb 
66 57 66 56 66 53 66 53 66 89 c7 67 66 89 14 24 66 89 ce 66 e8 15 f8 ff ff 88

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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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