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OpenHCL is much more interesting than OpenVMM:

Tl;Dr: Run the VM with only modern paravirtualized devices, then run OpenHCL inside the VM in ring -1 to emulate legacy devices and the guest os in ring 0 as usual.

This is more secure, as the host only exposes paravirtualized devices with reduced attack surface to the guest. While still allowing to run legacy os.




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