cpu: Call plugin hooks only when ready

The initialization and exit hooks will not affect the state of vCPU
outside TCG context, but they may depend on the state of vCPU.
Therefore, it's better to call plugin hooks after the vCPU state is
fully initialized and before it gets uninitialized.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231025093128.33116-16-akihiko.odaki@daynix.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231106185112.2755262-12-alex.bennee@linaro.org>

diff --git a/cpu-target.c b/cpu-target.c
index f3e1ad8bcdf8d82fac94bc3a226dd9642a29ff19..508013e23d2603f4e6f5275b5b657b7d19c114fa 100644 (file)
--- a/cpu-target.c
+++ b/cpu-target.c
@@ -42,7 +42,6 @@
 #include "hw/core/accel-cpu.h"
 #include "trace/trace-root.h"
 #include "qemu/accel.h"
-#include "qemu/plugin.h"
 
 uintptr_t qemu_host_page_size;
 intptr_t qemu_host_page_mask;
@@ -143,11 +142,6 @@ bool cpu_exec_realizefn(CPUState *cpu, Error **errp)
     /* Wait until cpu initialization complete before exposing cpu. */
     cpu_list_add(cpu);
 
-    /* Plugin initialization must wait until cpu_index assigned. */
-    if (tcg_enabled()) {
-        qemu_plugin_vcpu_init_hook(cpu);
-    }
-
 #ifdef CONFIG_USER_ONLY
     assert(qdev_get_vmsd(DEVICE(cpu)) == NULL ||
            qdev_get_vmsd(DEVICE(cpu))->unmigratable);
@@ -176,11 +170,6 @@ void cpu_exec_unrealizefn(CPUState *cpu)
     }
 #endif
 
-    /* Call the plugin hook before clearing cpu->cpu_index in cpu_list_remove */
-    if (tcg_enabled()) {
-        qemu_plugin_vcpu_exit_hook(cpu);
-    }
-
     cpu_list_remove(cpu);
     /*
      * Now that the vCPU has been removed from the RCU list, we can call

diff --git a/hw/core/cpu-common.c b/hw/core/cpu-common.c
index d4112b8919ff494c8b17b94c37e74133a0512a3a..82dae51a550b52b836fe9802784e6d50fb71c337 100644 (file)
--- a/hw/core/cpu-common.c
+++ b/hw/core/cpu-common.c
@@ -214,6 +214,11 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
         cpu_resume(cpu);
     }
 
+    /* Plugin initialization must wait until the cpu is fully realized. */
+    if (tcg_enabled()) {
+        qemu_plugin_vcpu_init_hook(cpu);
+    }
+
     /* NOTE: latest generic point where the cpu is fully realized */
 }
 
@@ -221,6 +226,11 @@ static void cpu_common_unrealizefn(DeviceState *dev)
 {
     CPUState *cpu = CPU(dev);
 
+    /* Call the plugin hook before clearing the cpu is fully unrealized */
+    if (tcg_enabled()) {
+        qemu_plugin_vcpu_exit_hook(cpu);
+    }
+
     /* NOTE: latest generic point before the cpu is fully unrealized */
     cpu_exec_unrealizefn(cpu);
 }