ChangeLog/10.1

Release schedule: Planning/10.1.

System emulation

Removed features and incompatible changes

Consult the 'Removed features' page for details of suggested replacement functionality.

New deprecated options and features

Consult the "Deprecated Features" chapter of the QEMU System Emulation User's Guide for further details of the deprecations and their suggested replacements.

Device emulation and assignment

9pfs

• Fixes for file descriptor reclaiming algorithm (i.e. when running towards host's allowed limit of max. open file descriptors).

• Additional fixes on use-after-unlink idiom (i.e. client operations on a file descriptor after file has been removed).

Migration

• RDMA live migration starts to support ipv6
• Postcopy preempt mode optimization on sequential memory accesses (e.g. video streaming)

Build Information

Rust usage

The minimum supported version of Rust is now 1.77.

• On Debian bookworm, it is available in the rustc-web package except for the mips64el architecture; Rust support for mips64el requires Debian trixie or newer.
• On Ubuntu 22.04 and 24.04, it is available in the rust-1.77 package; the RUSTC and RUSTDOC environment variables must point to /usr/bin/rustc-1.77 and /usr/bin/rustdoc-1.77 respectively.

Debian bookworm remains a supported platform for QEMU; support for Rust is still considered experimental and not stable, and it is not recommended to be used for anything other than development.

Known issues

• See https://gitlab.com/qemu-project/qemu/-/milestones/16