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-rw-r--r--exec.c58
1 files changed, 53 insertions, 5 deletions
diff --git a/exec.c b/exec.c
index ce5fadd..d817e5f 100644
--- a/exec.c
+++ b/exec.c
@@ -526,12 +526,57 @@ void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as)
}
#endif
+#ifndef CONFIG_USER_ONLY
+static DECLARE_BITMAP(cpu_index_map, MAX_CPUMASK_BITS);
+
+static int cpu_get_free_index(Error **errp)
+{
+ int cpu = find_first_zero_bit(cpu_index_map, MAX_CPUMASK_BITS);
+
+ if (cpu >= MAX_CPUMASK_BITS) {
+ error_setg(errp, "Trying to use more CPUs than max of %d",
+ MAX_CPUMASK_BITS);
+ return -1;
+ }
+
+ bitmap_set(cpu_index_map, cpu, 1);
+ return cpu;
+}
+
+void cpu_exec_exit(CPUState *cpu)
+{
+ if (cpu->cpu_index == -1) {
+ /* cpu_index was never allocated by this @cpu or was already freed. */
+ return;
+ }
+
+ bitmap_clear(cpu_index_map, cpu->cpu_index, 1);
+ cpu->cpu_index = -1;
+}
+#else
+
+static int cpu_get_free_index(Error **errp)
+{
+ CPUState *some_cpu;
+ int cpu_index = 0;
+
+ CPU_FOREACH(some_cpu) {
+ cpu_index++;
+ }
+ return cpu_index;
+}
+
+void cpu_exec_exit(CPUState *cpu)
+{
+}
+#endif
+
void cpu_exec_init(CPUArchState *env, Error **errp)
{
CPUState *cpu = ENV_GET_CPU(env);
CPUClass *cc = CPU_GET_CLASS(cpu);
- CPUState *some_cpu;
int cpu_index;
+ Error *local_err = NULL;
#ifndef CONFIG_USER_ONLY
cpu->as = &address_space_memory;
@@ -542,11 +587,14 @@ void cpu_exec_init(CPUArchState *env, Error **errp)
#if defined(CONFIG_USER_ONLY)
cpu_list_lock();
#endif
- cpu_index = 0;
- CPU_FOREACH(some_cpu) {
- cpu_index++;
+ cpu_index = cpu->cpu_index = cpu_get_free_index(&local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+#if defined(CONFIG_USER_ONLY)
+ cpu_list_unlock();
+#endif
+ return;
}
- cpu->cpu_index = cpu_index;
QTAILQ_INSERT_TAIL(&cpus, cpu, node);
#if defined(CONFIG_USER_ONLY)
cpu_list_unlock();
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