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With the EFI stub in the Linux kernel and the ability to embed an initrd in the kernel, you can boot a small distribution with just the kernel file. The only issue is that it takes a long time to load a very large kernel into memory like that.

I tried that with a buildroot based hypervisor I created for my home lab.



I remember doing something similar, only using pxe to chain boot Linux from an HTTP server. iirc we used https://ipxe.org/




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