How to migrate virtual machines from Hyper-V to KVM?

Question

linux

Given: A bunch of virtual machines successfully spinning on Hyper-V
Task: Transfer them to KVM
Tried:

#qemu-img convert -f vpc -o raw vpc.vhdx vpc.img
qemu-img: Could not open 'vpc.vhdx': Operation not permitted
qemu-img: Could not open 'vpc.vhdx'

With the indication of the full path - the same story.
There are other options?

Answer 1

What is the version of qemu-img?
Perhaps this information will help you. They write there that for qemu-img newer than 1.1.1, it is enough to rename the extension to vhd.
Well, or converting vhdx to vhd in 2012.