Converting VM to generation 2 in Hyper-v

 1. Create a VM from vagrant, this is gen1.

2. Although disk is VHDX, export it, add more space in Hyper-V

3. Attach this drive to old VM and expand drive is disk management.

4. Convert to GPT using MBR2GPT.

    mbr2gpt.exe /validate /disk:1 /allowFullOS

    mbr2gpt.exe /convert /disk:1 /allowFullOS 

This will create a partition at the end.

5. Create a new VM (Gen2) and use exported drive.