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plugins: add hooks for new discontinuity related callbacks

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The plugin API allows registration of callbacks for a variety of VCPU
related events, such as VCPU reset, idle and resume. In addition, we
recently introduced API for registering callbacks for discontinuity
events, specifically for interrupts, exceptions and host calls.

This change introduces the corresponding hooks called from target
specific code inside qemu.

Signed-off-by: Julian Ganz <neither@nut.email>
Message-ID: <20251027110344.2289945-10-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Julian Ganz 2025-10-27 11:03:16 +00:00 • committed by Alex Bennée
parent aac73d85d2
commit a1688bc86c
2 changed files with 54 additions and 0 deletions
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42
plugins/core.c
View file

@ -105,6 +105,30 @@ static void plugin_vcpu_cb__simple(CPUState *cpu, enum qemu_plugin_event ev)
}
}
/*
* Disable CFI checks.
* The callback function has been loaded from an external library so we do not
* have type information
*/
QEMU_DISABLE_CFI
static void plugin_vcpu_cb__discon(CPUState *cpu,
enum qemu_plugin_event ev,
enum qemu_plugin_discon_type type,
uint64_t from)
{
struct qemu_plugin_cb *cb, *next;
uint64_t to = cpu->cc->get_pc(cpu);
if (cpu->cpu_index < plugin.num_vcpus) {
/* iterate safely; plugins might uninstall themselves at any time */
QLIST_FOREACH_SAFE_RCU(cb, &plugin.cb_lists[ev], entry, next) {
qemu_plugin_vcpu_discon_cb_t func = cb->f.vcpu_discon;
func(cb->ctx->id, cpu->cpu_index, type, from, to);
}
}
}
/*
* Disable CFI checks.
* The callback function has been loaded from an external library so we do not
@ -557,6 +581,24 @@ void qemu_plugin_vcpu_resume_cb(CPUState *cpu)
}
}
void qemu_plugin_vcpu_interrupt_cb(CPUState *cpu, uint64_t from)
{
plugin_vcpu_cb__discon(cpu, QEMU_PLUGIN_EV_VCPU_INTERRUPT,
QEMU_PLUGIN_DISCON_INTERRUPT, from);
}
void qemu_plugin_vcpu_exception_cb(CPUState *cpu, uint64_t from)
{
plugin_vcpu_cb__discon(cpu, QEMU_PLUGIN_EV_VCPU_EXCEPTION,
QEMU_PLUGIN_DISCON_EXCEPTION, from);
}
void qemu_plugin_vcpu_hostcall_cb(CPUState *cpu, uint64_t from)
{
plugin_vcpu_cb__discon(cpu, QEMU_PLUGIN_EV_VCPU_HOSTCALL,
QEMU_PLUGIN_DISCON_HOSTCALL, from);
}
void qemu_plugin_register_vcpu_idle_cb(qemu_plugin_id_t id,
qemu_plugin_vcpu_simple_cb_t cb)
{