Converting Windows 2012 R2 from Hyper-V to KVM (qemu)
What's your tool for converting? MVMC? You can also try StarWind v2v converter: https://www.starwindsoftware.com/converter It was a big help at my time. And besides, it makes identical hard drive when converts from Hyper-v. Conversion itself is performing at the block level, so all the blocks should be copied unchanged.
yum install qemu-img
First, check the file, make sure it’s ok.
qemu-img check -r all rmcjmc01.vhdx
If ok, convert the file
qemu-img convert -O qcow2 rmcgmc01.vhdx rmcgmc01.qcow2