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plugins: add time control API

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Expose the ability to control time through the plugin API. Only one
plugin can control time so it has to request control when loaded.
There are probably more corner cases to catch here.

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
[AJB: tweaked user-mode handling, merged QEMU_PLUGIN_API fix]
Message-Id: <20240530220610.1245424-6-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240620152220.2192768-9-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2024-06-20 16:22:16 +01:00
parent d4d133a34b
commit 847a65dd76
3 changed files with 64 additions and 0 deletions
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35
plugins/api.c
View file

@ -39,6 +39,7 @@
#include "qemu/main-loop.h"
#include "qemu/plugin.h"
#include "qemu/log.h"
#include "qemu/timer.h"
#include "tcg/tcg.h"
#include "exec/exec-all.h"
#include "exec/gdbstub.h"
@ -583,3 +584,37 @@ uint64_t qemu_plugin_u64_sum(qemu_plugin_u64 entry)
}
return total;
}
/*
* Time control
*/
static bool has_control;
const void *qemu_plugin_request_time_control(void)
{
if (!has_control) {
has_control = true;
return &has_control;
}
return NULL;
}
#ifdef CONFIG_SOFTMMU
static void advance_virtual_time__async(CPUState *cpu, run_on_cpu_data data)
{
int64_t new_time = data.host_ulong;
qemu_clock_advance_virtual_time(new_time);
}
#endif
void qemu_plugin_update_ns(const void *handle, int64_t new_time)
{
#ifdef CONFIG_SOFTMMU
if (handle == &has_control) {
/* Need to execute out of cpu_exec, so bql can be locked. */
async_run_on_cpu(current_cpu,
advance_virtual_time__async,
RUN_ON_CPU_HOST_ULONG(new_time));
}
#endif
}