vgsp-sema: hold an entry on any unresolvable operand, not only mid-scan (ISSUE-0002)

The guest driver's pma scrub submits vidmem memsets on a GR channel; the
operand translations (client buffer VAs, pinned by the scanner) land about
a second after the push. The one-pass skip lost those memsets forever and
the guest spun in scrubCheckAndWaitForSize (r58 c3: three bigop memsets
rc=-22 at 17:54:35, their pins logged at 17:54:36, the channel froze at
get=89 with the client in pmaAllocatePages). Mark the operand path pending
on any unresolved operand so the existing bounded entry hold retries the
decode until the translation lands; raise the retry bound to 160 so the
hold covers the observed pin latency.

0 files changed, 0 insertions, 0 deletions