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+<think>
+Okay, let's try to figure out how to classify this bug report. The user provided a detailed problem where their KVM VMs on top of VMware ESX are not booting when using virtio disk drives after an update to Proxmox. 
+
+First, the issue is happening with QEMU-KVM version 2.7, and it's specifically related to virtio-based VMs not booting anymore. The user mentions that changing the disk from virtio0 to scsi0 works as a workaround for some distributions but not all. Also, downgrading QEMU-KVM to an older version fixes the issue.
+
+Looking at the possible categories: hypervisor seems relevant because the problem is within KVM's functionality. The bug report is about VMs failing to boot when using virtio, which is a virtualization component handled by the hypervisor. Other options like 'device' or 'network' could be considered, but since it's specifically about booting and the hypervisor's handling of virtio, 'hypervisor' fits best.
+
+I think the key here is that the issue is with how QEMU-KVM (the hypervisor) interacts with the virtio devices during the VM boot process. The BIOS shows attempting to boot from the harddisk, but it loops, indicating a problem in the virtual hardware setup or driver interaction under KVM. Since this behavior changed after an update and a known workaround is downgrading QEMU-KVM, it points towards a regression introduced in version 2.7.
+
+So, the most appropriate category for this bug would be 'hypervisor' because it's directly related to how KVM manages virtual devices during VM booting.
+</think>
+
+hypervisor
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