Peter Grehan fb5f5a17ef Advertise 64-bit physical-address capability.
This fixes a coredump with NetBSD guests when XHCI is configured.
On seeing the AC64 flag clear, the NetBSD XHCI driver was only writing
to the lower 32-bits of 64-bit physical address registers. The emulation
relies on a write to the hi 32-bits to calculate a host virtual address
for internal use, and has always supported 64-bit addressing.

All other guests were seen to write to both the lo- and hi- address
registers, regardless of the AC64 setting.

Discussed with:  Leon Dang (author)
Tested with:  Ubuntu 16/18/20, Windows10, OpenBSD UEFI guests.

MFC after:	2 weeks.
2020-07-10 07:26:50 +00:00
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