qemu/contrib/plugins/Makefile, branch master

contrib/plugins: be more vocal building

2024-07-30T10:44:21Z

With the conversion to meson and removing the old QEMU Makefile baggage we became very silent when building the plugins. Bring in a copy of the quiet-command logic (and some magic COMMAs) so we can at least assure developers we are building them. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2457 Signed-off-by: Alex Bennée Message-Id: <20240729144414.830369-13-alex.bennee@linaro.org>

plugins/stoptrigger: TCG plugin to stop execution under conditions

2024-07-22T08:37:56Z

This new plugin allows to stop emulation using conditions on the emulation state. By setting this plugin arguments, it is possible to set an instruction count limit and/or trigger address(es) to stop at. The code returned at emulation exit can be customized. This plugin demonstrates how someone could stop QEMU execution. It could be used for research purposes to launch some code and deterministically stop it and understand where its execution flow went. Co-authored-by: Alexandre Iooss Signed-off-by: Simon Hamelin Signed-off-by: Alexandre Iooss Reviewed-by: Pierrick Bouvier Message-Id: <20240715081521.19122-2-simon.hamelin@grenoble-inp.org> Signed-off-by: Alex Bennée Message-Id: <20240718094523.1198645-5-alex.bennee@linaro.org>

contrib/plugins: add Instructions Per Second (IPS) example for cost modeling

2024-06-24T09:15:10Z

This plugin uses the new time control interface to make decisions about the state of time during the emulation. The algorithm is currently very simple. The user specifies an ips rate which applies per core. If the core runs ahead of its allocated execution time the plugin sleeps for a bit to let real time catch up. Either way time is updated for the emulation as a function of total executed instructions with some adjustments for cores that idle. Examples -------- Slow down execution of /bin/true: $ num_insn=$(./build/qemu-x86_64 -plugin ./build/tests/plugin/libinsn.so -d plugin /bin/true |& grep total | sed -e 's/.*: //') $ time ./build/qemu-x86_64 -plugin ./build/contrib/plugins/libips.so,ips=$(($num_insn/4)) /bin/true real 4.000s Boot a Linux kernel simulating a 250MHz cpu: $ /build/qemu-system-x86_64 -kernel /boot/vmlinuz-6.1.0-21-amd64 -append "console=ttyS0" -plugin ./build/contrib/plugins/libips.so,ips=$((250*1000*1000)) -smp 1 -m 512 check time until kernel panic on serial0 Tested in system mode by booting a full debian system, and using: $ sysbench cpu run Performance decrease linearly with the given number of ips. Signed-off-by: Pierrick Bouvier Message-Id: <20240530220610.1245424-7-pierrick.bouvier@linaro.org> Signed-off-by: Alex Bennée Message-Id: <20240620152220.2192768-11-alex.bennee@linaro.org>

plugins: fix win plugin tests on cross compile

2023-11-23T14:10:04Z

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1972 Cross compile gcc is more picky about argument order than msys. Changed the meson command to take the (now renamed) libqemu_plugin_api.a as a lib, rather than an object. This puts it in the right place on both native and cross compile gcc commands Reenable plugins on crossbuilds Signed-off-by: Greg Manning Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20231109124326.21106-2-gmanning@rapitasystems.com> Signed-off-by: Alex Bennée Message-Id: <20231120150833.2552739-5-alex.bennee@linaro.org>

plugins: disable lockstep plugin on windows

2023-11-08T15:15:23Z

The lockstep plugin uses unix sockets and would require a different communication mechanism to work on Windows. Signed-off-by: Greg Manning Reviewed-by: Alex Bennée Message-Id: <20231102172053.17692-4-gmanning@rapitasystems.com> Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Alex Bennée Message-Id: <20231106185112.2755262-16-alex.bennee@linaro.org>

plugins: make test/example plugins work on windows

2023-11-08T15:15:23Z

Generate a qemu_plugin_api.lib delay import lib on windows, for windows qemu plugins to link against. Implement an example dll load fail hook to link up the API functions correctly when a plugin is loaded on windows. Update the build scripts for the test and example plugins to use these things. Signed-off-by: Greg Manning Acked-by: Alex Bennée Message-Id: <20231102172053.17692-3-gmanning@rapitasystems.com> [AJB: use find_program for dlltool, s/Windows/windows/] Cc: Paolo Bonzini Signed-off-by: Alex Bennée Message-Id: <20231106185112.2755262-15-alex.bennee@linaro.org>

contrib/plugins: use an independent makefile

2023-09-07T11:32:35Z

The initial reason to write this patch was to remove the last use of CONFIG_DEBUG_TCG from the makefiles; the flags to use to build TCG plugins are unrelated to --enable-debug-tcg, and instead they should be the same as those used to build emulators (the plugins are not build via meson for demonstration reasons only). However, since contrib/plugins/Makefile is also the last case of doing a compilation job using config-host.mak, go a step further and make it use a completely separate configuration file, removing all references to compilers from the toplevel config-host.mak. Clean up references to empty variables, and use .SECONDARY so that intermediate object files are not deleted. Reviewed-by: Daniel P. Berrangé Signed-off-by: Paolo Bonzini

contrib/plugins: add Darwin support

2023-09-07T11:32:14Z

Under Darwin, using -shared makes it impossible to have undefined symbols and -bundle has to be used instead; so detect the OS and use different options. Based-on: <20230907101811.469236-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini

contrib/plugins: remove -soname argument

2023-09-07T10:17:54Z

-soname is not needed for runtime-loaded modules. For example, Meson says: if not isinstance(target, build.SharedModule) or target.force_soname: # Add -Wl,-soname arguments on Linux, -install_name on OS X commands += linker.get_soname_args( self.environment, target.prefix, target.name, target.suffix, target.soversion, target.darwin_versions) (force_soname is set is shared modules are linked into a build target, which is not the case here. Signed-off-by: Paolo Bonzini

build: move warning flag selection to meson

2023-05-18T11:35:28Z

Meson already knows to test with the positive form of the flag, which simplifies the test. Warnings are now tested explicitly for the C++ compiler, instead of hardcoding those that are only available for the C language. At this point all compiler flags in QEMU_CFLAGS are global and only depend on the OS. No feature tests are performed in configure. Reviewed-by: Marc-André Lureau Signed-off-by: Paolo Bonzini