cpus: extract out qtest-specific code to accel/qtest

register a "CpusAccel" interface for qtest as well.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

accel/qtest/meson.build

@@ -0,0 +1,7 @@
+qtest_ss = ss.source_set()
+qtest_ss.add(files(
+  'qtest.c',
+  'qtest-cpus.c',
+))
+
+specific_ss.add_all(when: ['CONFIG_SOFTMMU', 'CONFIG_POSIX'], if_true: qtest_ss)

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);
+}
+
+const CpusAccel qtest_cpus = {
+    .create_vcpu_thread = qtest_start_vcpu_thread,
+    .get_virtual_clock = qtest_get_virtual_clock,
+};

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 const CpusAccel qtest_cpus;
+
+#endif /* QTEST_CPUS_H */

accel/qtest/qtest.c

@@ -0,0 +1,57 @@
+/*
+ * 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 int qtest_init_accel(MachineState *ms)
+{
+    cpus_register_accel(&qtest_cpus);
+    return 0;
+}
+
+static void qtest_accel_class_init(ObjectClass *oc, void *data)
+{
+    AccelClass *ac = ACCEL_CLASS(oc);
+    ac->name = "QTest";
+    ac->init_machine = qtest_init_accel;
+    ac->allowed = &qtest_allowed;
+}
+
+#define TYPE_QTEST_ACCEL ACCEL_CLASS_NAME("qtest")
+
+static const TypeInfo qtest_accel_type = {
+    .name = TYPE_QTEST_ACCEL,
+    .parent = TYPE_ACCEL,
+    .class_init = qtest_accel_class_init,
+};
+
+static void qtest_type_init(void)
+{
+    type_register_static(&qtest_accel_type);
+}
+
+type_init(qtest_type_init);