[Qemu-devel] [Bug 1705717] Re: Live migration fails with 'host' cpu when KVM is inserted with nested=1

[Dr. David Alan Gilbert]

Hmm OK; but if you do hit it again please just reopen this one and give
the full assert and details

** Changed in: qemu
       Status: New => Invalid

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Title:
  Live migration fails with 'host' cpu when KVM is inserted with
  nested=1

Status in QEMU:
  Invalid

Bug description:
  Qemu v2.9.0
  Linux kernel 4.9.34

  Live migration(pre-copy) being done from one physical host to another:

  Source Qemu:
  sudo qemu-system-x86_64 -drive file=${IMAGE_DIR}/${IMAGE_NAME},if=virtio -m 
2048 -smp 1 -net nic,model=virtio,macaddr=${MAC} -net 
tap,ifname=qtap0,script=no,downscript=no -vnc :1 --enable-kvm -cpu kvm64 -qmp 
tcp:*:4242,server,nowait

  And KVM is inserted with nested=1 on both source and destination
  machine.

  Migration fails with a nested specific assertion failure on
  destination at target/i386/kvm.c +1629

  Migration is successful in the following cases-

  A) cpu model is 'host' and kvm is inserted without nested=1 parameter
  B) If instead of 'host' cpu model, 'kvm64' is used (KVM nested=1)
  C) If instead of 'host' cpu model, 'kvm64' is used (KVM nested=0)
  D) Between an L0 and a guest Hypervisor L1, with 'kvm64' as CPU type (and 
nested=1 for L0 KVM)

  Physical host(s)-
  $ lscpu
  Architecture:          x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Little Endian
  CPU(s):                12
  On-line CPU(s) list:   0-11
  Thread(s) per core:    1
  Core(s) per socket:    6
  Socket(s):             2
  NUMA node(s):          2
  Vendor ID:             GenuineIntel
  CPU family:            6
  Model:                 62
  Model name:            Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz
  Stepping:              4
  CPU MHz:               1200.091
  CPU max MHz:           2600.0000
  CPU min MHz:           1200.0000
  BogoMIPS:              4203.28
  Virtualization:        VT-x
  L1d cache:             32K
  L1i cache:             32K
  L2 cache:              256K
  L3 cache:              15360K
  NUMA node0 CPU(s):     0-5
  NUMA node1 CPU(s):     6-11
  Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est 
tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt 
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm epb tpr_shadow vnmi 
flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts

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