KVM support

[whitebelyash]

Would massively speed up iOS on 16K hosts (Raspberry Pi 5 or Asahi Linux Macs).

Currently it crashes on T8103/M1 with:

info: lookup_in_static_trust_cache @ 0xfffffff0097edcb8

Missing patch: trustcache16
kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION failed, slot=16, start=0x210050000, size=0x10000: Invalid argument
kvm_set_phys_mem: error registering slot: Invalid argument
/home/whbex/boot.sh: line 8: 21027 Aborted         

unlike HVF, that at least somewhat boots.

Initially thought of posting this in #68, but that issue now tracks Hypervisor.framework support on macOS hosts.

[chris-pcguy]

Professor Farnsworth voice: Good news everybody!

The Raspberry Pi 5b 16 GiB RAM version seems to be virtually impossible to get in Dubai, and that's good for me, because that way I didn't lost too much money by buying 1x 8 GiB instead of 2x 16 GiB.

But to get to the other good news, it doesn't support PAC, so you would need to settle for S8000 if you want to virtualize. :-P

Even more good news, it looks like it doesn't support EL3 virtualization, so that's that with S8000. audibly exhaling

However, T8010 or T8015 might be possible.

[VisualEhrmanntraut]

You omitted the detail where you also need to build a custom Linux kernel after applying a patch to add a feature that should've been here in the first place.

[chris-pcguy]

Whoops, thanks for mentioning that. I took alephsecurity's/afek's/aronsky's patches and ported them to the rpi5b 8gb, the rpi-6.16.y kernel branch. It's a hot mess, but it somewhat works, if it weren't for the said missing PAC or EL3 virtualization support.