Is it possible to convert a BIOS to UEFI and introduce vTPM into an existing VM?

[DustinB]

I'm pretty sure the answer is no, and that the VM needs to start new with UEFI and with vTPM, but just looking for confirmation.

TIA.

[Andrew]

@DustinB The answer is yes, you can, I have.

I have changed modern Linux form BIOS to boot as UEFI. All I had to do was change to GPT, add a ESP/EFI boot partition, change the OS partition mounting, and install the needed EFI boot files. Also update the OS to know it's now a EFI boot setup so the OS updates boot files correctly (a GRUB package change). Then I can set the VM to be UEFI boot... It was not an automated process and I did it as an off-line procedure (not booting the OS I was changing).

UEFI VMs boot quicker than BIOS VMs.

I have not converted windows as I normally started newer versions as UEFI and older version work better with BIOS.

[DustinB]

@Andrew To me the summary answer is no, ha. The content of this system is nothing super important. So replacing it new would be the quicker approach.