[PATCH v3 00/11] gpu: nova-core: vbios: harden various array accesses and refactor

[Eliot Courtney <ecourtney@nvidia.com>]

We have some code that accesses arrays based on values from firmware.
This patch series makes a bunch of those accesses more robust. This
series only touches accesses that are not guaranteed to be safe by local
invariants - some accesses are safe due to earlier checks and I haven't
modified those.

This series also refactors and removes some code that can be simplified.
In particular, it removes `FwSecBiosBuilder`. It also adds some more
stringent checking for PCI-AT and FWSEC images so duplicate ones will
result in an error.

Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
---
Changes in v3:
- Use first PCI-AT and FWSEC images instead of erroring.
- Expand commit messages.
- Add Joel's Reviewed-by's (thanks!)
- Link to v2: https://patch.msgid.link/20260414-fix-vbios-v2-0-705d30d16bba@nvidia.com

Changes in v2:
- Add Joel's reviewed-by tags.
- Remove unnecessary code like `falcon_data_offset` from
  `FwSecBiosBuilder`
- Push offset handling into `falcon_data_ptr` (renamed)
- Simplify `setup_falcon_data`
- Add checking for spurious PCI-AT and FWSEC images.
- Remove `FwSecBiosBuilder`
- Link to v1: https://patch.msgid.link/20260410-fix-vbios-v1-0-bc6f71d153d6@nvidia.com

---
Eliot Courtney (11):
      gpu: nova-core: vbios: fix various cases of reading past `BIOS_MAX_SCAN_LEN`
      gpu: nova-core: vbios: limit `BitToken` entry reads
      gpu: nova-core: vbios: use checked ops and accesses in `FwSecBiosImage::ucode`
      gpu: nova-core: vbios: use checked access in `FwSecBiosImage::header`
      gpu: nova-core: vbios: use checked accesses in `setup_falcon_data`
      gpu: nova-core: vbios: drop unused falcon_data_offset from FwSecBiosBuilder
      gpu: nova-core: vbios: keep PmuLookupTable local in setup_falcon_data
      gpu: nova-core: vbios: compute FWSEC-relative Falcon data offset
      gpu: nova-core: vbios: simplify setup_falcon_data
      gpu: nova-core: vbios: construct `FwSecBiosImage` directly from BIOS images
      gpu: nova-core: vbios: use the first PCI-AT and FWSEC images

 drivers/gpu/nova-core/vbios.rs | 300 +++++++++++++++++------------------------
 1 file changed, 125 insertions(+), 175 deletions(-)
---
base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd
change-id: 20260409-fix-vbios-d668e9c21d23

Best regards,
--  
Eliot Courtney <ecourtney@nvidia.com>