Migrating centos VM from VirtualBox or VMWare to hyper-v

 In order to migrate centos to hyper-v, there is need to include hyper-v drivers to initramfs. The next command will do the task:

dracut -f --add-drivers 'hv_vmbus hv_storvsc hv_netvsc hv_utils hv_balloon hyperv-keyboard hyperv_fb hid-hyperv'

Or else system will fail to detect the disk and will fail to boot. If you see the emergency shell then it is the case. 

Possible error messages:

Timed out waiting for device ...
Warning: /dev/disk/... does not exist

 Tested on centos 8