QEMU virtio-gpu CVE fix and Hexagon series

QEMU development led the day with a virtio-gpu security fix and large patch series for Hexagon and migration. PostgreSQL threads refined publication syntax and WAL compression defaults.

Virtio-GPU control header length checks

A v2 patch for QEMU rejects requests carrying short or truncated control headers in virtio-gpu. The change adds length checks for virtio_gpu_ctrl_hdr in the virtio-gpu and vhost-user-gpu paths, fixing CVE-2026-18054. Operators running virtualized GPU workloads should apply the update to close the truncation issue.

Helper-to-TCG translator series

A 50-patch series introduces an LLVM-based helper-to-TCG translator and applies it to the Hexagon target in QEMU. The work aims to automate conversion of helpers into TCG operations for that architecture. QEMU developers maintaining TCG or Hexagon support face a large review surface.

Fast snapshot load for migration

The v4 migration series adds fast snapshot load to QEMU. It supports lazy RAM page loading from mapped-ram files through userfaultfd. Users restoring large VM snapshots gain a path to lower initial load latency.

Hexagon L2VIC and QTimer devices

A v4 series adds Hexagon L2VIC and QTimer device emulation, shared subsystem refactoring, and tests to QEMU. The patches broaden hardware coverage for the Hexagon architecture. Emulator maintainers targeting that platform obtain additional device models and test coverage.

EXCEPT for TABLES IN SCHEMA publications

PostgreSQL hackers continued iterative review of EXCEPT support for TABLES IN SCHEMA publications. Discussion stayed on code comments and small refinements. Logical replication users may later obtain tighter control when publishing entire schemas.

WAL compression default to lz4

PostgreSQL developers examined a patch that would make wal_compression 'on' select lz4 by default, matching the PG19 LZ4 change. The thread weighs configuration behavior after the upstream default shift. Operators preparing upgrades should track the resulting setting semantics.

TCG revbit opcodes

Richard Henderson proposed TCG revbit32 and revbit64 opcodes together with aarch64 and loongarch64 backends and related target cleanups. The 11-patch series extends the TCG intermediate representation for bit reversal. Target maintainers can replace open-coded sequences once the opcodes land.

SanMiguel BMC and TMP75 sensors

A v2 series adds the Facebook SanMiguel BMC machine type and dedicated TMP75-family sensor models to QEMU, along with test helpers. The work expands ARM BMC emulation for that platform. Contributors to open BMC environments receive new machine and sensor support.