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[Qemu-devel] [Bug 1636217] Re: qemu-kvm 2.7 does not boot kvm VMs with v

From: Fabian Grünbichler
Subject: [Qemu-devel] [Bug 1636217] Re: qemu-kvm 2.7 does not boot kvm VMs with virtio on top of VMware ESX
Date: Thu, 03 Nov 2016 07:35:39 -0000

unfortunately cherry-picking the SeaBIOS 1.10 binary update commit from
qemu master (6e99f5741ff1) on top of v2.7.0 does not solve the issue
(the only observable change is the version string that is displayed on
booting, right when it hangs ;)).

I can still give your suggested route a try if you think it is worth it,
but since the 1.10 release contains your suggested commit, I doubt it
will change anything..

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  qemu-kvm 2.7 does not boot kvm VMs with virtio on top of VMware ESX

Status in QEMU:

Bug description:
  After todays Proxmox update all my Linux VMs stopped booting.

  # How to reproduce
  - Have KVM on top of VMware ESX (I use VMware ESX 6)
  - Boot Linux VM with virtio Disk drive.

  # Result
  virtio based VMs do not boot anymore:

  address@hidden:/etc/pve/nodes/demotuxdc/qemu-server# grep virtio0 100.conf 
  bootdisk: virtio0
  virtio0: pvestorage:100/vm-100-disk-1.raw,discard=on,size=20G

  (initially with cache=writethrough, but that doesn´t matter)

  What happens instead is:

  - BIOS displays "Booting from harddisk..."
  - kvm process of VM loops at about 140% of Intel(R) Core(TM) i5-6260U CPU @ 
1.80GHz Skylake dual core CPU

  Disk of course has valid bootsector:

  address@hidden:/srv/pvestorage/images/100# file -sk vm-100-disk-1.raw 
  vm-100-disk-1.raw: DOS/MBR boot sector DOS/MBR boot sector DOS executable 
(COM), boot code
  address@hidden:/srv/pvestorage/images/100# head -c 2048 vm-100-disk-1.raw | 
hd | grep GRUB
  00000170  be 94 7d e8 2e 00 cd 18  eb fe 47 52 55 42 20 00  |..}.......GRUB .|

  # Workaround 1
  - Change disk from virtio0 to scsi0
  - Debian boots out of the box after this change
  - SLES 12 needs a rebuilt initrd
  - CentOS 7 too, but it seems that is not even enough and it still fails (even 
in hostonly="no" mode for dracut)

  # Workaround 2
  Downgrade pve-qemu-kvm 2.7.0-3 to 2.6.2-2.

  # Expected results
  Disk boots just fine via virtio like it did before.

  # Downstream bug report
  Downstream suggests an issue with upstream qemu-kvm:


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