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Is HVF Apple-specific? Is it related to ARMv8.3/8.4 Nested Virtualization? Does Graviton 3 or some other commercial offering have this support too?

Yes. HVF is the QEMU driver for Apple/macOS Hypervisor.Framework

So basically KVM for Mac then? So like on Linux you have QEMU+KVM, on Mac you instead have QEMU+HVF?

Pretty much!