I traced this back to the switch to enabling virtio-1 mode by default in 2.7 in commit 9a4c0e220d8a4f82b5665d0ee95ef94d8e1509d5
forcing the old behaviour with a 2.6 machine type works. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1636217 Title: qemu-kvm 2.7 does not boot kvm VMs with virtio on top of VMware ESX Status in QEMU: New 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: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1636217/+subscriptions
