

Might be a bit late on this, but ProxMox doesn’t really handle assigning threads to the e/p cores. That’s handled by the kernel and as long you’re running kernel version 6.1 or greater you should be good on that front.
If you really need to, you can also pin specific VMs to specific cores. So that if you’ve got something that always needs the performance it can always run on the p-cores and things that aren’t as demanding can always run on e-cores.
That said, especially if you’re over provisioning, it’s probably better to let the scheduler in the kernel handle thread assignments.
Calibre cant natively strip DRM from ebooks, but there are third-party plugins for it that can and integrate pretty seamlessly into the process of adding the book to your library.
I used it to strip the DRM from all of my Amazon bought ebooks back before they removed the download option.