On 5/11/25 6:13 AM, Julian Ganz wrote:
We recently introduced new plugin API for registration of discontinuity related callbacks. This change introduces a minimal plugin showcasing the new API. It simply counts the occurances of interrupts, exceptions and host calls per CPU and reports the counts when exitting.Signed-off-by: Julian Ganz <neither@nut.email> --- contrib/plugins/meson.build | 3 +- contrib/plugins/traps.c | 100 ++++++++++++++++++++++++++++++++++++ docs/about/emulation.rst | 8 +++ 3 files changed, 110 insertions(+), 1 deletion(-) create mode 100644 contrib/plugins/traps.c +typedef struct { + uint64_t interrupts; + uint64_t exceptions; + uint64_t hostcalls; + bool active;
The scoreboard is automatically resized only when a new vcpu is initialized, so if an entry is present, it means it's present by definition.
Thus, you can remove the active field.
+} TrapCounters; + +static struct qemu_plugin_scoreboard *traps; +static size_t max_vcpus; +
You can use qemu_plugin_num_vcpus() instead of keeping a copy of max_vcpus. It returns the number of vcpus started, which guarantees you'll find associated entries in any scoreboard.
[...] With those small changes, Reviewed-by: Pierrick Bouvier <pierrick.bouv...@linaro.org>
