Set USB-XHCI bus for USB storage when using aarch64 system architecture

[conath]

Fixes Partially fixes #3194 (Windows 11 installer causes QEMU EHCI reset, aborting install)

The result of this PR is that for aarch64 guest, the USB CD drive is connected to the XHCI bus:

This has the nice side effect of increasing the speed of the USB drive.

Edit: added "partially" above to reflect my findings while testing. See my comment for details.

[osy]

I think that bus isn’t created if self.configuration.inputLegacy is set. So maybe need to add that to the condition?

[conath]

That could work. Why not always generate the XHCI bus regardless of the input setting?

[osy]

Lots of machines don’t support it. And machines that do may not support it in the OS.

[conath]

I'm thinking we could gate it behind the EFI boot flag or specific systems. Or maybe there should be a USB2/3 switch like in other apps.

The easiest is probably your suggestion 😃

[conath]

should be fine now

[lonione]

Faced the same issue with 2.4.1 and Windows 11 22533.1001_PROFESSIONAL_ARM64_EN-US.ISO
Quite frustrating, as it kept failing (quite early, maybe around 5%) even after changing the XHCI bus. However, now it has successfully completed with the same config - so I can confirm it works eventually but requires some patience and persistence :) Thanks for the information in this thread.