[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ]

Posted a couple of revisions. Good feedback between this and MemTag, both of which need to adjust the set of TLBs.

[VIRT-339 # ARMv8.5-BTI, Branch Target Identification ]

Posted v7.

[VIRT-344 # ARMv8.5-MemTag, Memory Tagging Extension ]

Rebased upon current VHE+BTI work. Updated from beta manuals to the ARM ARM issue E.a manual.

[VIRT-327 # Richard's upstream QEMU work ]

Reviewed v1 x86 gen_sse rewrite. Reviewed Alex's v4 plugin patchset.

r~