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

From: introom
Subject: [Qemu-devel] [Bug 1636217] Re: qemu-kvm 2.7 does not boot kvm VMs with virtio on top of VMware ESX
Date: Thu, 16 Nov 2017 02:24:44 -0000

This problem still exists as of now on Debian sid. Qemu version is "QEMU
emulator version 2.10.1(Debian 1:2.10.0+dfsg-2)".

for "-machine type=pc-i440fx-x" where x > 2.6, all stuck at boot if the 
interface is virtio.

I use nested virtualization where the first level is VMWARE FUSION
(might not be the same as ESX), and the second is qemu-kvm.

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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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