[RFC,v3,4/8] cpus: extract out qtest-specific code to accel/qtest

diff --git a/MAINTAINERS b/MAINTAINERS
index 7dcc3ef4c8..f8bac8cb64 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2442,7 +2442,7 @@  M: Laurent Vivier <lvivier@redhat.com>
 R: Paolo Bonzini <pbonzini@redhat.com>
 S: Maintained
 F: softmmu/qtest.c
-F: accel/qtest.c
+F: accel/qtest/
 F: tests/qtest/
 X: tests/qtest/bios-tables-test-allowed-diff.h
 
diff --git a/accel/Makefile.objs b/accel/Makefile.objs
index ff72f0d030..c5e58eb53d 100644
--- a/accel/Makefile.objs
+++ b/accel/Makefile.objs
@@ -1,5 +1,5 @@ 
 common-obj-$(CONFIG_SOFTMMU) += accel.o
-obj-$(call land,$(CONFIG_SOFTMMU),$(CONFIG_POSIX)) += qtest.o
+obj-$(call land,$(CONFIG_SOFTMMU),$(CONFIG_POSIX)) += qtest/
 obj-$(CONFIG_KVM) += kvm/
 obj-$(CONFIG_TCG) += tcg/
 obj-$(CONFIG_XEN) += xen/
diff --git a/accel/qtest/Makefile.objs b/accel/qtest/Makefile.objs
new file mode 100644
index 0000000000..627014200e
--- /dev/null
+++ b/accel/qtest/Makefile.objs
@@ -0,0 +1,2 @@ 
+obj-y += qtest.o
+obj-y += qtest-cpus.o
diff --git a/accel/qtest/qtest-cpus.c b/accel/qtest/qtest-cpus.c
new file mode 100644
index 0000000000..ac10976ac6
--- /dev/null
+++ b/accel/qtest/qtest-cpus.c
@@ -0,0 +1,91 @@ 
+/*
+ * QTest accelerator code
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/rcu.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "sysemu/accel.h"
+#include "sysemu/qtest.h"
+#include "sysemu/cpus.h"
+#include "sysemu/cpu-timers.h"
+#include "qemu/guest-random.h"
+#include "qemu/main-loop.h"
+#include "hw/core/cpu.h"
+
+#include "qtest-cpus.h"
+
+static void *qtest_cpu_thread_fn(void *arg)
+{
+#ifdef _WIN32
+    error_report("qtest is not supported under Windows");
+    exit(1);
+#else
+    CPUState *cpu = arg;
+    sigset_t waitset;
+    int r;
+
+    rcu_register_thread();
+
+    qemu_mutex_lock_iothread();
+    qemu_thread_get_self(cpu->thread);
+    cpu->thread_id = qemu_get_thread_id();
+    cpu->can_do_io = 1;
+    current_cpu = cpu;
+
+    sigemptyset(&waitset);
+    sigaddset(&waitset, SIG_IPI);
+
+    /* signal CPU creation */
+    cpu_thread_signal_created(cpu);
+    qemu_guest_random_seed_thread_part2(cpu->random_seed);
+
+    do {
+        qemu_mutex_unlock_iothread();
+        do {
+            int sig;
+            r = sigwait(&waitset, &sig);
+        } while (r == -1 && (errno == EAGAIN || errno == EINTR));
+        if (r == -1) {
+            perror("sigwait");
+            exit(1);
+        }
+        qemu_mutex_lock_iothread();
+        qemu_wait_io_event(cpu);
+    } while (!cpu->unplug);
+
+    qemu_mutex_unlock_iothread();
+    rcu_unregister_thread();
+    return NULL;
+#endif
+}
+
+static void qtest_start_vcpu_thread(CPUState *cpu)
+{
+    char thread_name[VCPU_THREAD_NAME_SIZE];
+
+    cpu->thread = g_malloc0(sizeof(QemuThread));
+    cpu->halt_cond = g_malloc0(sizeof(QemuCond));
+    qemu_cond_init(cpu->halt_cond);
+    snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
+             cpu->cpu_index);
+    qemu_thread_create(cpu->thread, thread_name, qtest_cpu_thread_fn, cpu,
+                       QEMU_THREAD_JOINABLE);
+}
+
+CpusAccel qtest_cpus = {
+    .create_vcpu_thread = qtest_start_vcpu_thread,
+    .get_virtual_clock = qtest_get_virtual_clock,
+};
diff --git a/accel/qtest/qtest-cpus.h b/accel/qtest/qtest-cpus.h
new file mode 100644
index 0000000000..c1fab96b9e
--- /dev/null
+++ b/accel/qtest/qtest-cpus.h
@@ -0,0 +1,17 @@ 
+/*
+ * Accelerator CPUS Interface
+ *
+ * Copyright 2020 SUSE LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QTEST_CPUS_H
+#define QTEST_CPUS_H
+
+#include "sysemu/cpus.h"
+
+extern CpusAccel qtest_cpus;
+
+#endif /* QTEST_CPUS_H */
diff --git a/accel/qtest.c b/accel/qtest/qtest.c
similarity index 86%
rename from accel/qtest.c
rename to accel/qtest/qtest.c
index 119d0f16a4..537e8b449c 100644
--- a/accel/qtest.c
+++ b/accel/qtest/qtest.c
@@ -12,6 +12,7 @@ 
  */
 
 #include "qemu/osdep.h"
+#include "qemu/rcu.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
 #include "qemu/option.h"
@@ -20,9 +21,15 @@ 
 #include "sysemu/qtest.h"
 #include "sysemu/cpus.h"
 #include "sysemu/cpu-timers.h"
+#include "qemu/guest-random.h"
+#include "qemu/main-loop.h"
+#include "hw/core/cpu.h"
+
+#include "qtest-cpus.h"
 
 static int qtest_init_accel(MachineState *ms)
 {
+    cpus_register_accel(&qtest_cpus);
     return 0;
 }
 
diff --git a/softmmu/cpus.c b/softmmu/cpus.c
index eaed6749e3..9b4c59f6f5 100644
--- a/softmmu/cpus.c
+++ b/softmmu/cpus.c
@@ -40,7 +40,6 @@ 
 #include "qemu/thread.h"
 #include "qemu/plugin.h"
 #include "sysemu/cpus.h"
-#include "sysemu/qtest.h"
 #include "qemu/main-loop.h"
 #include "qemu/option.h"
 #include "qemu/bitmap.h"
@@ -247,9 +246,6 @@  int64_t cpus_get_virtual_clock(void)
     if (cpus_accel && cpus_accel->get_virtual_clock) {
         return cpus_accel->get_virtual_clock();
     }
-    if (qtest_enabled()) { /* for qtest_clock_warp */
-        return qtest_get_virtual_clock();
-    }
     return cpu_get_clock();
 }
 
@@ -483,51 +479,6 @@  static void *qemu_kvm_cpu_thread_fn(void *arg)
     return NULL;
 }
 
-static void *qemu_dummy_cpu_thread_fn(void *arg)
-{
-#ifdef _WIN32
-    error_report("qtest is not supported under Windows");
-    exit(1);
-#else
-    CPUState *cpu = arg;
-    sigset_t waitset;
-    int r;
-
-    rcu_register_thread();
-
-    qemu_mutex_lock_iothread();
-    qemu_thread_get_self(cpu->thread);
-    cpu->thread_id = qemu_get_thread_id();
-    cpu->can_do_io = 1;
-    current_cpu = cpu;
-
-    sigemptyset(&waitset);
-    sigaddset(&waitset, SIG_IPI);
-
-    /* signal CPU creation */
-    cpu_thread_signal_created(cpu);
-    qemu_guest_random_seed_thread_part2(cpu->random_seed);
-
-    do {
-        qemu_mutex_unlock_iothread();
-        do {
-            int sig;
-            r = sigwait(&waitset, &sig);
-        } while (r == -1 && (errno == EAGAIN || errno == EINTR));
-        if (r == -1) {
-            perror("sigwait");
-            exit(1);
-        }
-        qemu_mutex_lock_iothread();
-        qemu_wait_io_event(cpu);
-    } while (!cpu->unplug);
-
-    qemu_mutex_unlock_iothread();
-    rcu_unregister_thread();
-    return NULL;
-#endif
-}
-
 static void *qemu_hax_cpu_thread_fn(void *arg)
 {
     CPUState *cpu = arg;
@@ -905,19 +856,6 @@  void cpus_register_accel(CpusAccel *ca)
     cpus_accel = ca;
 }
 
-static void qemu_dummy_start_vcpu(CPUState *cpu)
-{
-    char thread_name[VCPU_THREAD_NAME_SIZE];
-
-    cpu->thread = g_malloc0(sizeof(QemuThread));
-    cpu->halt_cond = g_malloc0(sizeof(QemuCond));
-    qemu_cond_init(cpu->halt_cond);
-    snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
-             cpu->cpu_index);
-    qemu_thread_create(cpu->thread, thread_name, qemu_dummy_cpu_thread_fn, cpu,
-                       QEMU_THREAD_JOINABLE);
-}
-
 void qemu_init_vcpu(CPUState *cpu)
 {
     MachineState *ms = MACHINE(qdev_get_machine());
@@ -947,7 +885,7 @@  void qemu_init_vcpu(CPUState *cpu)
     } else if (whpx_enabled()) {
         qemu_whpx_start_vcpu(cpu);
     } else {
-        qemu_dummy_start_vcpu(cpu);
+        assert(0);
     }
 
     while (!cpu->created) {