[Qemu-devel] [Bug 1652333] Re: TCG mode fails to boot Linux kernel with qemu 2.6.0 and libvirt 2.0.0

[Thomas Huth]

Well, there are some clear indications in your log what might be wrong:

warning: TCG doesn't support requested feature: CPUID.01H:EDX.vme [bit 1]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 
24]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.osxsave [bit 27]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]

Try to disable these features in your "-cpu" parameter for example.
If that does not help, please try to start QEMU without libvirt first, to see 
whether it is an issue with libvirt (then you should report it to their bug 
tracker instead) or QEMU. And please use the latest release of QEMU (currently 
v2.8.0), since the bug might have already been fixed in a later version.

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

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https://bugs.launchpad.net/bugs/1652333

Title:
  TCG mode fails to boot Linux kernel with qemu 2.6.0 and libvirt 2.0.0

Status in QEMU:
  Incomplete

Bug description:
  Trying to boot a Cirros (minimal Linux) VM with qemu 2.6.0 and libvirt
  2.0.0 in TCG mode fails for me. The VM gets stuck in "Starting up ..."
  and never moves on. The command line used to boot the VM was:

  LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
  QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name
  guest=instance-00000002,debug-threads=on -S -object
  
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-instance-00000002
  /master-key.aes -machine pc-i440fx-rhel7.3.0,accel=tcg,usb=off -cpu
  SandyBridge,+osxsave,+hypervisor,+xsaveopt -m 512 -realtime mlock=off
  -smp 1,sockets=1,cores=1,threads=1 -uuid ae38b0e1-b3ae-41ec-
  8e50-c89669a2ec1c -smbios 'type=1,manufacturer=Red
  Hat,product=OpenStack Compute,version=14.0.2-7.el7ost,serial=edd3a67d-
  6ce5-4c36-8f20-085d1097abb7,uuid=ae38b0e1-b3ae-41ec-
  8e50-c89669a2ec1c,family=Virtual Machine' -no-user-config -nodefaults
  -chardev
  
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-1-instance-00000002/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-
  shutdown -boot strict=on -device piix3-usb-
  uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
  file=/var/lib/nova/instances/ae38b0e1-b3ae-41ec-
  8e50-c89669a2ec1c/disk,format=qcow2,if=none,id=drive-virtio-
  disk0,cache=none -device virtio-blk-
  pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-
  disk0,bootindex=1 -netdev tap,fd=28,id=hostnet0 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=fa:16:3e:c1:27:73,bus=pci.0,addr=0x3
  -add-fd set=1,fd=31 -chardev
  file,id=charserial0,path=/dev/fdset/1,append=on -device isa-
  serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1
  -device isa-serial,chardev=charserial1,id=serial1 -device usb-
  tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:0 -k en-us -device
  cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-
  pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on

  A qcow2 image can be downloaded from http://download.cirros-
  cloud.net/0.3.4/cirros-0.3.4-x86_64-disk.img to reproduce the issue.
  I've seen a similar failure with a CentOS 7.2 image.

  I am also attaching the libvirt log from the failed VM.

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