Refactor CPUState handling out of vl.c

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 773 insertions, 0 deletions

diff --git a/cpus.c b/cpus.c
new file mode 100644
index 0000000..9a8c2f7
--- /dev/null
+++ b/cpus.c
@@ -0,0 +1,773 @@
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* Needed early for CONFIG_BSD etc. */
+#include "config-host.h"
+
+#include "monitor.h"
+#include "sysemu.h"
+#include "gdbstub.h"
+#include "dma.h"
+#include "kvm.h"
+
+#include "cpus.h"
+
+static CPUState *cur_cpu;
+static CPUState *next_cpu;
+
+/***********************************************************/
+void hw_error(const char *fmt, ...)
+{
+    va_list ap;
+    CPUState *env;
+
+    va_start(ap, fmt);
+    fprintf(stderr, "qemu: hardware error: ");
+    vfprintf(stderr, fmt, ap);
+    fprintf(stderr, "\n");
+    for(env = first_cpu; env != NULL; env = env->next_cpu) {
+        fprintf(stderr, "CPU #%d:\n", env->cpu_index);
+#ifdef TARGET_I386
+        cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU);
+#else
+        cpu_dump_state(env, stderr, fprintf, 0);
+#endif
+    }
+    va_end(ap);
+    abort();
+}
+
+void cpu_synchronize_all_states(void)
+{
+    CPUState *cpu;
+
+    for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
+        cpu_synchronize_state(cpu);
+    }
+}
+
+void cpu_synchronize_all_post_reset(void)
+{
+    CPUState *cpu;
+
+    for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
+        cpu_synchronize_post_reset(cpu);
+    }
+}
+
+void cpu_synchronize_all_post_init(void)
+{
+    CPUState *cpu;
+
+    for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
+        cpu_synchronize_post_init(cpu);
+    }
+}
+
+static void do_vm_stop(int reason)
+{
+    if (vm_running) {
+        cpu_disable_ticks();
+        vm_running = 0;
+        pause_all_vcpus();
+        vm_state_notify(0, reason);
+        monitor_protocol_event(QEVENT_STOP, NULL);
+    }
+}
+
+static int cpu_can_run(CPUState *env)
+{
+    if (env->stop)
+        return 0;
+    if (env->stopped)
+        return 0;
+    if (!vm_running)
+        return 0;
+    return 1;
+}
+
+static int cpu_has_work(CPUState *env)
+{
+    if (env->stop)
+        return 1;
+    if (env->stopped)
+        return 0;
+    if (!env->halted)
+        return 1;
+    if (qemu_cpu_has_work(env))
+        return 1;
+    return 0;
+}
+
+static int tcg_has_work(void)
+{
+    CPUState *env;
+
+    for (env = first_cpu; env != NULL; env = env->next_cpu)
+        if (cpu_has_work(env))
+            return 1;
+    return 0;
+}
+
+#ifndef _WIN32
+static int io_thread_fd = -1;
+
+static void qemu_event_increment(void)
+{
+    /* Write 8 bytes to be compatible with eventfd.  */
+    static uint64_t val = 1;
+    ssize_t ret;
+
+    if (io_thread_fd == -1)
+        return;
+
+    do {
+        ret = write(io_thread_fd, &val, sizeof(val));
+    } while (ret < 0 && errno == EINTR);
+
+    /* EAGAIN is fine, a read must be pending.  */
+    if (ret < 0 && errno != EAGAIN) {
+        fprintf(stderr, "qemu_event_increment: write() filed: %s\n",
+                strerror(errno));
+        exit (1);
+    }
+}
+
+static void qemu_event_read(void *opaque)
+{
+    int fd = (unsigned long)opaque;
+    ssize_t len;
+    char buffer[512];
+
+    /* Drain the notify pipe.  For eventfd, only 8 bytes will be read.  */
+    do {
+        len = read(fd, buffer, sizeof(buffer));
+    } while ((len == -1 && errno == EINTR) || len == sizeof(buffer));
+}
+
+static int qemu_event_init(void)
+{
+    int err;
+    int fds[2];
+
+    err = qemu_eventfd(fds);
+    if (err == -1)
+        return -errno;
+
+    err = fcntl_setfl(fds[0], O_NONBLOCK);
+    if (err < 0)
+        goto fail;
+
+    err = fcntl_setfl(fds[1], O_NONBLOCK);
+    if (err < 0)
+        goto fail;
+
+    qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL,
+                         (void *)(unsigned long)fds[0]);
+
+    io_thread_fd = fds[1];
+    return 0;
+
+fail:
+    close(fds[0]);
+    close(fds[1]);
+    return err;
+}
+#else
+HANDLE qemu_event_handle;
+
+static void dummy_event_handler(void *opaque)
+{
+}
+
+static int qemu_event_init(void)
+{
+    qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL);
+    if (!qemu_event_handle) {
+        fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
+        return -1;
+    }
+    qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
+    return 0;
+}
+
+static void qemu_event_increment(void)
+{
+    if (!SetEvent(qemu_event_handle)) {
+        fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
+                GetLastError());
+        exit (1);
+    }
+}
+#endif
+
+#ifndef CONFIG_IOTHREAD
+int qemu_init_main_loop(void)
+{
+    return qemu_event_init();
+}
+
+void qemu_init_vcpu(void *_env)
+{
+    CPUState *env = _env;
+
+    env->nr_cores = smp_cores;
+    env->nr_threads = smp_threads;
+    if (kvm_enabled())
+        kvm_init_vcpu(env);
+    return;
+}
+
+int qemu_cpu_self(void *env)
+{
+    return 1;
+}
+
+void resume_all_vcpus(void)
+{
+}
+
+void pause_all_vcpus(void)
+{
+}
+
+void qemu_cpu_kick(void *env)
+{
+    return;
+}
+
+void qemu_notify_event(void)
+{
+    CPUState *env = cpu_single_env;
+
+    qemu_event_increment ();
+    if (env) {
+        cpu_exit(env);
+    }
+    if (next_cpu && env != next_cpu) {
+        cpu_exit(next_cpu);
+    }
+}
+
+void qemu_mutex_lock_iothread(void) {}
+void qemu_mutex_unlock_iothread(void) {}
+
+void vm_stop(int reason)
+{
+    do_vm_stop(reason);
+}
+
+#else /* CONFIG_IOTHREAD */
+
+#include "qemu-thread.h"
+
+QemuMutex qemu_global_mutex;
+static QemuMutex qemu_fair_mutex;
+
+static QemuThread io_thread;
+
+static QemuThread *tcg_cpu_thread;
+static QemuCond *tcg_halt_cond;
+
+static int qemu_system_ready;
+/* cpu creation */
+static QemuCond qemu_cpu_cond;
+/* system init */
+static QemuCond qemu_system_cond;
+static QemuCond qemu_pause_cond;
+
+static void tcg_block_io_signals(void);
+static void kvm_block_io_signals(CPUState *env);
+static void unblock_io_signals(void);
+
+int qemu_init_main_loop(void)
+{
+    int ret;
+
+    ret = qemu_event_init();
+    if (ret)
+        return ret;
+
+    qemu_cond_init(&qemu_pause_cond);
+    qemu_mutex_init(&qemu_fair_mutex);
+    qemu_mutex_init(&qemu_global_mutex);
+    qemu_mutex_lock(&qemu_global_mutex);
+
+    unblock_io_signals();
+    qemu_thread_self(&io_thread);
+
+    return 0;
+}
+
+static void qemu_wait_io_event_common(CPUState *env)
+{
+    if (env->stop) {
+        env->stop = 0;
+        env->stopped = 1;
+        qemu_cond_signal(&qemu_pause_cond);
+    }
+}
+
+static void qemu_wait_io_event(CPUState *env)
+{
+    while (!tcg_has_work())
+        qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
+
+    qemu_mutex_unlock(&qemu_global_mutex);
+
+    /*
+     * Users of qemu_global_mutex can be starved, having no chance
+     * to acquire it since this path will get to it first.
+     * So use another lock to provide fairness.
+     */
+    qemu_mutex_lock(&qemu_fair_mutex);
+    qemu_mutex_unlock(&qemu_fair_mutex);
+
+    qemu_mutex_lock(&qemu_global_mutex);
+    qemu_wait_io_event_common(env);
+}
+
+static void qemu_kvm_eat_signal(CPUState *env, int timeout)
+{
+    struct timespec ts;
+    int r, e;
+    siginfo_t siginfo;
+    sigset_t waitset;
+
+    ts.tv_sec = timeout / 1000;
+    ts.tv_nsec = (timeout % 1000) * 1000000;
+
+    sigemptyset(&waitset);
+    sigaddset(&waitset, SIG_IPI);
+
+    qemu_mutex_unlock(&qemu_global_mutex);
+    r = sigtimedwait(&waitset, &siginfo, &ts);
+    e = errno;
+    qemu_mutex_lock(&qemu_global_mutex);
+
+    if (r == -1 && !(e == EAGAIN || e == EINTR)) {
+        fprintf(stderr, "sigtimedwait: %s\n", strerror(e));
+        exit(1);
+    }
+}
+
+static void qemu_kvm_wait_io_event(CPUState *env)
+{
+    while (!cpu_has_work(env))
+        qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
+
+    qemu_kvm_eat_signal(env, 0);
+    qemu_wait_io_event_common(env);
+}
+
+static int qemu_cpu_exec(CPUState *env);
+
+static void *kvm_cpu_thread_fn(void *arg)
+{
+    CPUState *env = arg;
+
+    qemu_thread_self(env->thread);
+    if (kvm_enabled())
+        kvm_init_vcpu(env);
+
+    kvm_block_io_signals(env);
+
+    /* signal CPU creation */
+    qemu_mutex_lock(&qemu_global_mutex);
+    env->created = 1;
+    qemu_cond_signal(&qemu_cpu_cond);
+
+    /* and wait for machine initialization */
+    while (!qemu_system_ready)
+        qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
+
+    while (1) {
+        if (cpu_can_run(env))
+            qemu_cpu_exec(env);
+        qemu_kvm_wait_io_event(env);
+    }
+
+    return NULL;
+}
+
+static void *tcg_cpu_thread_fn(void *arg)
+{
+    CPUState *env = arg;
+
+    tcg_block_io_signals();
+    qemu_thread_self(env->thread);
+
+    /* signal CPU creation */
+    qemu_mutex_lock(&qemu_global_mutex);
+    for (env = first_cpu; env != NULL; env = env->next_cpu)
+        env->created = 1;
+    qemu_cond_signal(&qemu_cpu_cond);
+
+    /* and wait for machine initialization */
+    while (!qemu_system_ready)
+        qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
+
+    while (1) {
+        tcg_cpu_exec();
+        qemu_wait_io_event(cur_cpu);
+    }
+
+    return NULL;
+}
+
+void qemu_cpu_kick(void *_env)
+{
+    CPUState *env = _env;
+    qemu_cond_broadcast(env->halt_cond);
+    if (kvm_enabled())
+        qemu_thread_signal(env->thread, SIG_IPI);
+}
+
+int qemu_cpu_self(void *_env)
+{
+    CPUState *env = _env;
+    QemuThread this;
+
+    qemu_thread_self(&this);
+
+    return qemu_thread_equal(&this, env->thread);
+}
+
+static void cpu_signal(int sig)
+{
+    if (cpu_single_env)
+        cpu_exit(cpu_single_env);
+}
+
+static void tcg_block_io_signals(void)
+{
+    sigset_t set;
+    struct sigaction sigact;
+
+    sigemptyset(&set);
+    sigaddset(&set, SIGUSR2);
+    sigaddset(&set, SIGIO);
+    sigaddset(&set, SIGALRM);
+    sigaddset(&set, SIGCHLD);
+    pthread_sigmask(SIG_BLOCK, &set, NULL);
+
+    sigemptyset(&set);
+    sigaddset(&set, SIG_IPI);
+    pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+
+    memset(&sigact, 0, sizeof(sigact));
+    sigact.sa_handler = cpu_signal;
+    sigaction(SIG_IPI, &sigact, NULL);
+}
+
+static void dummy_signal(int sig)
+{
+}
+
+static void kvm_block_io_signals(CPUState *env)
+{
+    int r;
+    sigset_t set;
+    struct sigaction sigact;
+
+    sigemptyset(&set);
+    sigaddset(&set, SIGUSR2);
+    sigaddset(&set, SIGIO);
+    sigaddset(&set, SIGALRM);
+    sigaddset(&set, SIGCHLD);
+    sigaddset(&set, SIG_IPI);
+    pthread_sigmask(SIG_BLOCK, &set, NULL);
+
+    pthread_sigmask(SIG_BLOCK, NULL, &set);
+    sigdelset(&set, SIG_IPI);
+
+    memset(&sigact, 0, sizeof(sigact));
+    sigact.sa_handler = dummy_signal;
+    sigaction(SIG_IPI, &sigact, NULL);
+
+    r = kvm_set_signal_mask(env, &set);
+    if (r) {
+        fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(r));
+        exit(1);
+    }
+}
+
+static void unblock_io_signals(void)
+{
+    sigset_t set;
+
+    sigemptyset(&set);
+    sigaddset(&set, SIGUSR2);
+    sigaddset(&set, SIGIO);
+    sigaddset(&set, SIGALRM);
+    pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+
+    sigemptyset(&set);
+    sigaddset(&set, SIG_IPI);
+    pthread_sigmask(SIG_BLOCK, &set, NULL);
+}
+
+static void qemu_signal_lock(unsigned int msecs)
+{
+    qemu_mutex_lock(&qemu_fair_mutex);
+
+    while (qemu_mutex_trylock(&qemu_global_mutex)) {
+        qemu_thread_signal(tcg_cpu_thread, SIG_IPI);
+        if (!qemu_mutex_timedlock(&qemu_global_mutex, msecs))
+            break;
+    }
+    qemu_mutex_unlock(&qemu_fair_mutex);
+}
+
+void qemu_mutex_lock_iothread(void)
+{
+    if (kvm_enabled()) {
+        qemu_mutex_lock(&qemu_fair_mutex);
+        qemu_mutex_lock(&qemu_global_mutex);
+        qemu_mutex_unlock(&qemu_fair_mutex);
+    } else
+        qemu_signal_lock(100);
+}
+
+void qemu_mutex_unlock_iothread(void)
+{
+    qemu_mutex_unlock(&qemu_global_mutex);
+}
+
+static int all_vcpus_paused(void)
+{
+    CPUState *penv = first_cpu;
+
+    while (penv) {
+        if (!penv->stopped)
+            return 0;
+        penv = (CPUState *)penv->next_cpu;
+    }
+
+    return 1;
+}
+
+void pause_all_vcpus(void)
+{
+    CPUState *penv = first_cpu;
+
+    while (penv) {
+        penv->stop = 1;
+        qemu_thread_signal(penv->thread, SIG_IPI);
+        qemu_cpu_kick(penv);
+        penv = (CPUState *)penv->next_cpu;
+    }
+
+    while (!all_vcpus_paused()) {
+        qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
+        penv = first_cpu;
+        while (penv) {
+            qemu_thread_signal(penv->thread, SIG_IPI);
+            penv = (CPUState *)penv->next_cpu;
+        }
+    }
+}
+
+void resume_all_vcpus(void)
+{
+    CPUState *penv = first_cpu;
+
+    while (penv) {
+        penv->stop = 0;
+        penv->stopped = 0;
+        qemu_thread_signal(penv->thread, SIG_IPI);
+        qemu_cpu_kick(penv);
+        penv = (CPUState *)penv->next_cpu;
+    }
+}
+
+static void tcg_init_vcpu(void *_env)
+{
+    CPUState *env = _env;
+    /* share a single thread for all cpus with TCG */
+    if (!tcg_cpu_thread) {
+        env->thread = qemu_mallocz(sizeof(QemuThread));
+        env->halt_cond = qemu_mallocz(sizeof(QemuCond));
+        qemu_cond_init(env->halt_cond);
+        qemu_thread_create(env->thread, tcg_cpu_thread_fn, env);
+        while (env->created == 0)
+            qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
+        tcg_cpu_thread = env->thread;
+        tcg_halt_cond = env->halt_cond;
+    } else {
+        env->thread = tcg_cpu_thread;
+        env->halt_cond = tcg_halt_cond;
+    }
+}
+
+static void kvm_start_vcpu(CPUState *env)
+{
+    env->thread = qemu_mallocz(sizeof(QemuThread));
+    env->halt_cond = qemu_mallocz(sizeof(QemuCond));
+    qemu_cond_init(env->halt_cond);
+    qemu_thread_create(env->thread, kvm_cpu_thread_fn, env);
+    while (env->created == 0)
+        qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
+}
+
+void qemu_init_vcpu(void *_env)
+{
+    CPUState *env = _env;
+
+    env->nr_cores = smp_cores;
+    env->nr_threads = smp_threads;
+    if (kvm_enabled())
+        kvm_start_vcpu(env);
+    else
+        tcg_init_vcpu(env);
+}
+
+void qemu_notify_event(void)
+{
+    qemu_event_increment();
+}
+
+static void qemu_system_vmstop_request(int reason)
+{
+    vmstop_requested = reason;
+    qemu_notify_event();
+}
+
+void vm_stop(int reason)
+{
+    QemuThread me;
+    qemu_thread_self(&me);
+
+    if (!qemu_thread_equal(&me, &io_thread)) {
+        qemu_system_vmstop_request(reason);
+        /*
+         * FIXME: should not return to device code in case
+         * vm_stop() has been requested.
+         */
+        if (cpu_single_env) {
+            cpu_exit(cpu_single_env);
+            cpu_single_env->stop = 1;
+        }
+        return;
+    }
+    do_vm_stop(reason);
+}
+
+#endif
+
+static int qemu_cpu_exec(CPUState *env)
+{
+    int ret;
+#ifdef CONFIG_PROFILER
+    int64_t ti;
+#endif
+
+#ifdef CONFIG_PROFILER
+    ti = profile_getclock();
+#endif
+    if (use_icount) {
+        int64_t count;
+        int decr;
+        qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
+        env->icount_decr.u16.low = 0;
+        env->icount_extra = 0;
+        count = qemu_icount_round (qemu_next_deadline());
+        qemu_icount += count;
+        decr = (count > 0xffff) ? 0xffff : count;
+        count -= decr;
+        env->icount_decr.u16.low = decr;
+        env->icount_extra = count;
+    }
+    ret = cpu_exec(env);
+#ifdef CONFIG_PROFILER
+    qemu_time += profile_getclock() - ti;
+#endif
+    if (use_icount) {
+        /* Fold pending instructions back into the
+           instruction counter, and clear the interrupt flag.  */
+        qemu_icount -= (env->icount_decr.u16.low
+                        + env->icount_extra);
+        env->icount_decr.u32 = 0;
+        env->icount_extra = 0;
+    }
+    return ret;
+}
+
+bool tcg_cpu_exec(void)
+{
+    int ret = 0;
+
+    if (next_cpu == NULL)
+        next_cpu = first_cpu;
+    for (; next_cpu != NULL; next_cpu = next_cpu->next_cpu) {
+        CPUState *env = cur_cpu = next_cpu;
+
+        qemu_clock_enable(vm_clock,
+                          (cur_cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
+
+        if (qemu_alarm_pending())
+            break;
+        if (cpu_can_run(env))
+            ret = qemu_cpu_exec(env);
+        else if (env->stop)
+            break;
+
+        if (ret == EXCP_DEBUG) {
+            gdb_set_stop_cpu(env);
+            debug_requested = EXCP_DEBUG;
+            break;
+        }
+    }
+    return tcg_has_work();
+}
+
+void set_numa_modes(void)
+{
+    CPUState *env;
+    int i;
+
+    for (env = first_cpu; env != NULL; env = env->next_cpu) {
+        for (i = 0; i < nb_numa_nodes; i++) {
+            if (node_cpumask[i] & (1 << env->cpu_index)) {
+                env->numa_node = i;
+            }
+        }
+    }
+}
+
+void set_cpu_log(const char *optarg)
+{
+    int mask;
+    const CPULogItem *item;
+
+    mask = cpu_str_to_log_mask(optarg);
+    if (!mask) {
+        printf("Log items (comma separated):\n");
+        for (item = cpu_log_items; item->mask != 0; item++) {
+            printf("%-10s %s\n", item->name, item->help);
+        }
+        exit(1);
+    }
+    cpu_set_log(mask);
+}