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[Qemu-devel] [RFC 45/48] plugin: lockstep execution support
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [RFC 45/48] plugin: lockstep execution support |
Date: |
Thu, 25 Oct 2018 13:20:54 -0400 |
Signed-off-by: Emilio G. Cota <address@hidden>
---
include/qemu/plugin-api.h | 7 +++++++
include/qemu/plugin.h | 5 +++++
cpus.c | 1 +
plugin.c | 35 +++++++++++++++++++++++++++++++++++
qemu-plugins.symbols | 3 +++
5 files changed, 51 insertions(+)
diff --git a/include/qemu/plugin-api.h b/include/qemu/plugin-api.h
index 076353a2d2..5062e20e08 100644
--- a/include/qemu/plugin-api.h
+++ b/include/qemu/plugin-api.h
@@ -227,6 +227,13 @@ typedef int64_t (*qemu_plugin_clock_func_t)(void);
bool qemu_plugin_register_virtual_clock(qemu_plugin_id_t id,
qemu_plugin_clock_func_t clock);
+void qemu_plugin_enable_lockstep_execution(void);
+
+void qemu_plugin_register_lockstep_cb(qemu_plugin_id_t id,
+ qemu_plugin_simple_cb_t cb);
+
+void qemu_plugin_end_time_slice(void);
+
/* returns -1 in user-mode */
int qemu_plugin_n_vcpus(void);
diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h
index 617161329f..c19071bdbe 100644
--- a/include/qemu/plugin.h
+++ b/include/qemu/plugin.h
@@ -58,6 +58,7 @@ enum qemu_plugin_event {
QEMU_PLUGIN_EV_VCPU_RESUME,
QEMU_PLUGIN_EV_VCPU_SYSCALL,
QEMU_PLUGIN_EV_VCPU_SYSCALL_RET,
+ QEMU_PLUGIN_EV_LOCKSTEP,
QEMU_PLUGIN_EV_FLUSH,
QEMU_PLUGIN_EV_ATEXIT,
QEMU_PLUGIN_EV_MAX,
@@ -194,6 +195,7 @@ void qemu_plugin_atexit_cb(void);
void qemu_plugin_add_dyn_cb_arr(struct qemu_plugin_dyn_cb_arr *arr);
int64_t plugin_get_clock(void);
+void plugin_lockstep_cb(void);
#else /* !CONFIG_PLUGINS */
@@ -237,6 +239,9 @@ static inline
void qemu_plugin_add_dyn_cb_arr(struct qemu_plugin_dyn_cb_arr *arr)
{ }
+static inline void plugin_lockstep_cb(void)
+{ }
+
int64_t plugin_get_clock(void);
#endif /* !CONFIG_PLUGINS */
diff --git a/cpus.c b/cpus.c
index a446632a5c..8f490d1b11 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1359,6 +1359,7 @@ static void lockstep_check_stop(CPUState *cpu)
/* wake up all waiting cpus */
lockstep_ongoing_wakeup = true;
n_lockstep_running_cpus = n_lockstep_cpus;
+ plugin_lockstep_cb();
qemu_mutex_unlock(&lockstep_lock);
cpu_mutex_unlock(cpu);
for (i = 0; i < n_lockstep_cpus; i++) {
diff --git a/plugin.c b/plugin.c
index 291767f2bb..117f303249 100644
--- a/plugin.c
+++ b/plugin.c
@@ -472,6 +472,7 @@ static void plugin_cb__simple(enum qemu_plugin_event ev)
switch (ev) {
case QEMU_PLUGIN_EV_FLUSH:
+ case QEMU_PLUGIN_EV_LOCKSTEP:
QLIST_FOREACH_SAFE_RCU(cb, &plugin.cb_lists[ev], entry, next) {
qemu_plugin_simple_cb_t func = cb->f.simple;
@@ -1043,6 +1044,40 @@ int64_t plugin_get_clock(void)
}
#endif
+/*
+ * We manage the CPU state changes; the plugin will control the length of the
+ * execution windows.
+ */
+void qemu_plugin_enable_lockstep_execution(void)
+{
+#ifdef CONFIG_USER_ONLY
+ abort();
+#else
+ cpu_lockstep_enable();
+#endif
+}
+
+void qemu_plugin_end_time_slice(void)
+{
+#ifdef CONFIG_USER_ONLY
+ abort();
+#else
+ g_assert(current_cpu);
+ cpu_lockstep_request_stop(current_cpu);
+#endif
+}
+
+void qemu_plugin_register_lockstep_cb(qemu_plugin_id_t id,
+ qemu_plugin_simple_cb_t cb)
+{
+ plugin_register_cb(id, QEMU_PLUGIN_EV_LOCKSTEP, cb);
+}
+
+void plugin_lockstep_cb(void)
+{
+ plugin_cb__simple(QEMU_PLUGIN_EV_LOCKSTEP);
+}
+
static void __attribute__((__constructor__)) plugin_init(void)
{
int i;
diff --git a/qemu-plugins.symbols b/qemu-plugins.symbols
index 93587b07e1..a3268a40c7 100644
--- a/qemu-plugins.symbols
+++ b/qemu-plugins.symbols
@@ -1,5 +1,8 @@
{
qemu_plugin_uninstall;
+ qemu_plugin_enable_lockstep_execution;
+ qemu_plugin_end_time_slice;
+ qemu_plugin_register_lockstep_cb;
qemu_plugin_register_vcpu_init_cb;
qemu_plugin_register_vcpu_exit_cb;
qemu_plugin_register_vcpu_idle_cb;
--
2.17.1
- [Qemu-devel] [RFC 00/48] Plugin support, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 37/48] target/openrisc: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 45/48] plugin: lockstep execution support,
Emilio G. Cota <=
- [Qemu-devel] [RFC 29/48] target/hppa: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 21/48] *-user: plugin syscalls, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 46/48] plugin: add plugin-chan PCI device, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 44/48] cpus: lockstep execution support, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 36/48] target/xtensa: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 42/48] vl: support -plugin option, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 33/48] target/riscv: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 30/48] target/m68k: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 35/48] target/sparc: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 41/48] configure: add --enable-plugins, Emilio G. Cota, 2018/10/25