qemu/qemu.git/meson.build, branch master

crypto: deprecate the AF_ALG crypto backend

2026-09-07T10:31:03+00:00

Linux 7.2 has deprecated the AF_ALG crypto backend: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a67afb1884ba815079bd43d5c998e155e03b08b6 And has documented it to be always slower than userspace crypto: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5624ea54f3ba5c83d2e5503411a31a8be0278c1e as a result of dropping support for zero-copy and hardware accelerators: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7524070f26d8d347c26787dc297fb844baa26abf https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ffdd2bc378953b525aca61902534e753f1f8e734 The main use case for the AF_ALG impl was to improve the performance of virtio-crypto with the cryptodev-backend-builtin driver. In practice this did not matter since 'cryptodev-backend-lkcf' can do offload to the kernel via the keyctl syscall, and 'cryptodev-vhost-user' can offload to an external process which can optionally integrate with hardware accelerators without kernel assistance. The AF_ALG backend has no user visible configuration options at runtime, it is unconditionally tried with any use of the cipher APIs. So it does not strictly have to go through the deprecation process, however, it is left available initially in case there was an unexpected use case that relies on it which may be faster with old kernels before the above Linux commits. Suggested-by: Thomas Huth Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Cédric Le Goater Signed-off-by: Daniel P. Berrangé

meson.build: add summary for TCG tests

2026-09-04T15:06:22+00:00

Replacing existing summary that only contained information about existing cross compilers with a full summary for all targets. We add gdb and container information. We specify cc for each target (softmmu + linux-user) independently in case we would use different cc for bare metal vs user binaries. Users can query full command line for tests by building tests with tcg-tests target, so no need to repeat it here. Output before change: $ ./configure Cross compilers aarch64 : /path/to/qemu/build/pyvenv/bin/python3 -B /path/to/qemu/tests/docker/docker.py --engine auto cc --cc aarch64-linux-gnu-gcc -i qemu/debian-arm64-cross -s /path/to/qemu -- aarch64_be : /path/to/qemu/build/pyvenv/bin/python3 -B /path/to/qemu/tests/docker/docker.py --engine auto cc --cc aarch64-linux-gnu-gcc -i qemu/debian-all-test-cross -s /path/to/qemu -- alpha : alpha-linux-gnu-gcc ... Output after change: $ ./configure --disable-containers TCG tests gdb : /usr/bin/gdb-multiarch container command : NO cc for aarch64-softmmu : NO cc for aarch64-linux-user : NO cc for aarch64_be-linux-user : NO cc for alpha-softmmu : alpha-linux-gnu-gcc $ ./configure --gdb=gdb --container-command=podman TCG tests gdb : /usr/bin/gdb container command : podman cc for aarch64-softmmu : aarch64-linux-gnu-gcc (from 'debian-all-test-cross' container) cc for aarch64-linux-user : aarch64-linux-gnu-gcc (from 'debian-all-test-cross' container) cc for aarch64_be-linux-user : aarch64-linux-gnu-gcc (from 'debian-all-test-cross' container) cc for alpha-softmmu : alpha-linux-gnu-gcc ... Tested-by: Aniket Sahu Reviewed-by: Alex Bennée Signed-off-by: Pierrick Bouvier Message-ID: <20260827221506.91574-104-pierrick.bouvier@oss.qualcomm.com> Signed-off-by: Alex Bennée

meson: bump minimal version to 1.6.0

2026-09-04T14:06:02+00:00

Without it, we'll get the following warning: WARNING: Project specifies a minimum meson_version '>=1.5.0' but uses features which were added in newer versions: * 1.6.0: {'test with external_program in args'} Which we require because of how we build iteratively our test command line. Tested-by: Aniket Sahu Reviewed-by: Alex Bennée Signed-off-by: Pierrick Bouvier Message-ID: <20260827221506.91574-5-pierrick.bouvier@oss.qualcomm.com> Signed-off-by: Alex Bennée

build-sys: add 'hmp' option

2026-08-29T08:07:45+00:00

Add an option to enable/disable HMP support, default to true. The following commits are going to make --disable-hmp gradually work. Reviewed-by: Daniel P. Berrangé Signed-off-by: Marc-André Lureau Message-ID: <20260828-qemu-no-hmp-v5-49-9227de146347@redhat.com>

build-sys: make HMP source files conditional on have_hmp

2026-08-29T08:07:45+00:00

Exclude all *-hmp-cmds.c files and HMP-only source files from the build when HMP is disabled. Also conditionalise the hmp-commands.hx header generation and the test-hmp qtest. Acked-by: Dr. David Alan Gilbert Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Marc-André Lureau Message-ID: <20260828-qemu-no-hmp-v5-45-9227de146347@redhat.com>

build-sys: introduce CONFIG_HMP

2026-08-29T08:07:43+00:00

Introduce a config define to mark regions that should be compiled out or disabeld when CONFIG_HMP is off. The actual meson configuration option is introduced later, as for now, only "true" is supported. Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Daniel P. Berrangé Signed-off-by: Marc-André Lureau Message-ID: <20260828-qemu-no-hmp-v5-1-9227de146347@redhat.com>

scripts: remove now dead parts of rustc_args.py

2026-08-20T07:24:57+00:00

The logic to parse the [lints] section has been integrated into Meson and can be removed. Reviewed-by: Marc-André Lureau Signed-off-by: Paolo Bonzini

rust: use meson automatic parsing of Cargo.toml

2026-08-20T07:24:57+00:00

Finally, automatic parsing of Cargo.toml is also possible for QEMU's own crates, not just for subprojects. This removes the need to list the dependencies and language editions in both Cargo.toml and meson.build files. Reviewed-by: Marc-André Lureau Signed-off-by: Paolo Bonzini

meson: use compiler_target() to get rustc target

2026-08-20T07:24:57+00:00

The new method in Meson 1.11.x removes the need to pass the triple via config-host.mak. Reviewed-by: Marc-André Lureau Signed-off-by: Paolo Bonzini

rust: switch to autogenerated meson rules

2026-08-20T07:24:57+00:00

Meson can automatically generate most of the build rules for subprojects, based on the contents of their Cargo.toml. Handwritten snippets can be placed in meson/meson.build to replace build.rs. Disable Meson's use of the nightly-only option "--env-set". It is buggy and anyway it should not be there in future version. Reviewed-by: Marc-André Lureau Signed-off-by: Paolo Bonzini