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- admit {GPU VA -> PA} pairs only when the preceding bytes form a valid
client memory descriptor header (type 0/1, CPU+GPU mapped bits), prefer
validated pairs over headerless candidates under first-wins dedup, and
invalidate the translation cache on every rebuild; fixes stale identity
entries shadowing live pool pages and lets the guest UVM channel
bring-up complete on its own
- capture OS event allocations (class 0x79) and post event records
(function 0x1003) into the guest status queue when a channel's busy
notification is consumed, with a broadcast fallback, serialized with
replies via a queue lock
- add BAR0 shadow introspection (dump_bar0/scan_bar0) and guest-side
diagnostic scripts for the VM cycle
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