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+
+qemu-kvm 2.7 does not boot kvm VMs with virtio on top of VMware ESX
+
+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:
+
+root@demotuxdc:/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:
+
+root@demotuxdc:/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
+root@demotuxdc:/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:
+
+https://bugzilla.proxmox.com/show_bug.cgi?id=1181
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