vgsp: copy completeness hardening + COPYAUDIT/COPY-TRUNC instrumentation

Map every guest-data copy path and its caps (CE soft copy/fill/inline,
GR fill span, late/gap span, bounce copy-in/out, forwarded CE copy,
launch-page pools) and close the two silent partial-data holes:

- late/gap span cap (gsp_phys_booter.c): a word cut at the 16-page cap
  was still rewritten to the partial run; probe one page past the cut
  and log COPY-TRUNC when it is resolvable (r218 shape: 4 words x 16
  pages = all four cut at the cap).
- GR fill span walk (gsp_sema_service.c): a mid-span resolution miss
  after >=1 authored page now logs COPY-TRUNC (was GRFILL-DROP only,
  launch proceeded with fill_hold=0).

Instrumentation (all additive, no new locks/waits, readback uses the
same accessor the write just used):

- COPYAUDIT path=... va/len/done for every >=32 KB copy (CE soft copy,
  fill, GRCE inline, GR bounce/gap copy-in and copy-out).
- COPY-MISMATCH 16-byte start/end destination readback vs the written
  bytes right after the copy (CE first/last chunk; fill and inline first
  16 B; GR staging first+last 16 B of every page).
- COPY-TRUNC on every partial copy: CE loop returns, fill/grce chunk
  failures, short GR staging/copy-out counts, reloc-fix-span,
  gr-fill-span; want>done is rate-limited but never silent.

make kernel green; only the pre-existing %x warning at
gsp_phys_booter.c:14088.

0 files changed, 0 insertions, 0 deletions