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6792a57bf1
qemu/cpus.c
Jan Kiszka 6792a57bf1 kvm: Separate TCG from KVM cpu execution 
Mixing up TCG bits with KVM already led to problems around eflags
emulation on x86. Moreover, quite some code that TCG requires on cpu
enty/exit is useless for KVM. So dispatch between tcg_cpu_exec and
kvm_cpu_exec as early as possible.

The core logic of cpu_halted from cpu_exec is added to
kvm_arch_process_irqchip_events. Moving away from cpu_exec makes
exception_index meaningless for KVM, we can simply pass the exit reason
directly (only "EXCP_DEBUG vs. rest" is relevant).

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-14 12:39:46 -02:00

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/*
* 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 "exec-all.h"
#include "cpus.h"
#include "compatfd.h"
#ifdef SIGRTMIN
#define SIG_IPI (SIGRTMIN+4)
#else
#define SIG_IPI SIGUSR1
#endif
#ifdef CONFIG_LINUX
#include <sys/prctl.h>
#ifndef PR_MCE_KILL
#define PR_MCE_KILL 33
#endif
#ifndef PR_MCE_KILL_SET
#define PR_MCE_KILL_SET 1
#endif
#ifndef PR_MCE_KILL_EARLY
#define PR_MCE_KILL_EARLY 1
#endif
#endif /* CONFIG_LINUX */
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);
}
}
int cpu_is_stopped(CPUState *env)
{
return !vm_running || env->stopped;
}
static void do_vm_stop(int reason)
{
if (vm_running) {
cpu_disable_ticks();
vm_running = 0;
pause_all_vcpus();
vm_state_notify(0, reason);
qemu_aio_flush();
bdrv_flush_all();
monitor_protocol_event(QEVENT_STOP, NULL);
}
}
static int cpu_can_run(CPUState *env)
{
if (env->stop) {
return 0;
}
if (env->stopped || !vm_running) {
return 0;
}
return 1;
}
static bool cpu_thread_is_idle(CPUState *env)
{
if (env->stop || env->queued_work_first) {
return false;
}
if (env->stopped || !vm_running) {
return true;
}
if (!env->halted || qemu_cpu_has_work(env)) {
return false;
}
return true;
}
static bool all_cpu_threads_idle(void)
{
CPUState *env;
for (env = first_cpu; env != NULL; env = env->next_cpu) {
if (!cpu_thread_is_idle(env)) {
return false;
}
}
return true;
}
static CPUDebugExcpHandler *debug_excp_handler;
CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler)
{
CPUDebugExcpHandler *old_handler = debug_excp_handler;
debug_excp_handler = handler;
return old_handler;
}
static void cpu_handle_debug_exception(CPUState *env)
{
CPUWatchpoint *wp;
if (!env->watchpoint_hit) {
QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
wp->flags &= ~BP_WATCHPOINT_HIT;
}
}
if (debug_excp_handler) {
debug_excp_handler(env);
}
gdb_set_stop_cpu(env);
qemu_system_debug_request();
#ifdef CONFIG_IOTHREAD
env->stopped = 1;
#endif
}
#ifdef CONFIG_LINUX
static void sigbus_reraise(void)
{
sigset_t set;
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_handler = SIG_DFL;
if (!sigaction(SIGBUS, &action, NULL)) {
raise(SIGBUS);
sigemptyset(&set);
sigaddset(&set, SIGBUS);
sigprocmask(SIG_UNBLOCK, &set, NULL);
}
perror("Failed to re-raise SIGBUS!\n");
abort();
}
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
void *ctx)
{
if (kvm_on_sigbus(siginfo->ssi_code,
(void *)(intptr_t)siginfo->ssi_addr)) {
sigbus_reraise();
}
}
static void qemu_init_sigbus(void)
{
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_flags = SA_SIGINFO;
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
sigaction(SIGBUS, &action, NULL);
prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
}
#else /* !CONFIG_LINUX */
static void qemu_init_sigbus(void)
{
}
#endif /* !CONFIG_LINUX */
#ifndef _WIN32
static int io_thread_fd = -1;
static void qemu_event_increment(void)
{
/* Write 8 bytes to be compatible with eventfd. */
static const 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;
}
static void dummy_signal(int sig)
{
}
/* If we have signalfd, we mask out the signals we want to handle and then
* use signalfd to listen for them. We rely on whatever the current signal
* handler is to dispatch the signals when we receive them.
*/
static void sigfd_handler(void *opaque)
{
int fd = (unsigned long) opaque;
struct qemu_signalfd_siginfo info;
struct sigaction action;
ssize_t len;
while (1) {
do {
len = read(fd, &info, sizeof(info));
} while (len == -1 && errno == EINTR);
if (len == -1 && errno == EAGAIN) {
break;
}
if (len != sizeof(info)) {
printf("read from sigfd returned %zd: %m\n", len);
return;
}
sigaction(info.ssi_signo, NULL, &action);
if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
action.sa_sigaction(info.ssi_signo,
(siginfo_t *)&info, NULL);
} else if (action.sa_handler) {
action.sa_handler(info.ssi_signo);
}
}
}
static int qemu_signalfd_init(sigset_t mask)
{
int sigfd;
sigfd = qemu_signalfd(&mask);
if (sigfd == -1) {
fprintf(stderr, "failed to create signalfd\n");
return -errno;
}
fcntl_setfl(sigfd, O_NONBLOCK);
qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL,
(void *)(unsigned long) sigfd);
return 0;
}
static void qemu_kvm_eat_signals(CPUState *env)
{
struct timespec ts = { 0, 0 };
siginfo_t siginfo;
sigset_t waitset;
sigset_t chkset;
int r;
sigemptyset(&waitset);
sigaddset(&waitset, SIG_IPI);
sigaddset(&waitset, SIGBUS);
do {
r = sigtimedwait(&waitset, &siginfo, &ts);
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
perror("sigtimedwait");
exit(1);
}
switch (r) {
case SIGBUS:
if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) {
sigbus_reraise();
}
break;
default:
break;
}
r = sigpending(&chkset);
if (r == -1) {
perror("sigpending");
exit(1);
}
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
#ifndef CONFIG_IOTHREAD
if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) {
qemu_notify_event();
}
#endif
}
#else /* _WIN32 */
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);
}
}
static void qemu_kvm_eat_signals(CPUState *env)
{
}
#endif /* _WIN32 */
#ifndef CONFIG_IOTHREAD
static void qemu_kvm_init_cpu_signals(CPUState *env)
{
#ifndef _WIN32
int r;
sigset_t set;
struct sigaction sigact;
memset(&sigact, 0, sizeof(sigact));
sigact.sa_handler = dummy_signal;
sigaction(SIG_IPI, &sigact, NULL);
sigemptyset(&set);
sigaddset(&set, SIG_IPI);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGALRM);
pthread_sigmask(SIG_BLOCK, &set, NULL);
pthread_sigmask(SIG_BLOCK, NULL, &set);
sigdelset(&set, SIG_IPI);
sigdelset(&set, SIGBUS);
sigdelset(&set, SIGIO);
sigdelset(&set, SIGALRM);
r = kvm_set_signal_mask(env, &set);
if (r) {
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
exit(1);
}
#endif
}
#ifndef _WIN32
static sigset_t block_synchronous_signals(void)
{
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGBUS);
if (kvm_enabled()) {
/*
* We need to process timer signals synchronously to avoid a race
* between exit_request check and KVM vcpu entry.
*/
sigaddset(&set, SIGIO);
sigaddset(&set, SIGALRM);
}
return set;
}
#endif
int qemu_init_main_loop(void)
{
#ifndef _WIN32
sigset_t blocked_signals;
int ret;
blocked_signals = block_synchronous_signals();
ret = qemu_signalfd_init(blocked_signals);
if (ret) {
return ret;
}
#endif
qemu_init_sigbus();
return qemu_event_init();
}
void qemu_main_loop_start(void)
{
}
void qemu_init_vcpu(void *_env)
{
CPUState *env = _env;
int r;
env->nr_cores = smp_cores;
env->nr_threads = smp_threads;
if (kvm_enabled()) {
r = kvm_init_vcpu(env);
if (r < 0) {
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
exit(1);
}
qemu_kvm_init_cpu_signals(env);
}
}
int qemu_cpu_self(void *env)
{
return 1;
}
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
{
func(data);
}
void resume_all_vcpus(void)
{
}
void pause_all_vcpus(void)
{
}
void qemu_cpu_kick(void *env)
{
}
void qemu_cpu_kick_self(void)
{
#ifndef _WIN32
assert(cpu_single_env);
raise(SIG_IPI);
#else
abort();
#endif
}
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);
}
exit_request = 1;
}
void qemu_mutex_lock_iothread(void) {}
void qemu_mutex_unlock_iothread(void) {}
void cpu_stop_current(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 QemuCond qemu_work_cond;
static void cpu_signal(int sig)
{
if (cpu_single_env) {
cpu_exit(cpu_single_env);
}
exit_request = 1;
}
static void qemu_kvm_init_cpu_signals(CPUState *env)
{
int r;
sigset_t set;
struct sigaction sigact;
memset(&sigact, 0, sizeof(sigact));
sigact.sa_handler = dummy_signal;
sigaction(SIG_IPI, &sigact, NULL);
pthread_sigmask(SIG_BLOCK, NULL, &set);
sigdelset(&set, SIG_IPI);
sigdelset(&set, SIGBUS);
r = kvm_set_signal_mask(env, &set);
if (r) {
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
exit(1);
}
}
static void qemu_tcg_init_cpu_signals(void)
{
sigset_t set;
struct sigaction sigact;
memset(&sigact, 0, sizeof(sigact));
sigact.sa_handler = cpu_signal;
sigaction(SIG_IPI, &sigact, NULL);
sigemptyset(&set);
sigaddset(&set, SIG_IPI);
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
}
static sigset_t block_io_signals(void)
{
sigset_t set;
/* SIGUSR2 used by posix-aio-compat.c */
sigemptyset(&set);
sigaddset(&set, SIGUSR2);
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
sigemptyset(&set);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIG_IPI);
sigaddset(&set, SIGBUS);
pthread_sigmask(SIG_BLOCK, &set, NULL);
return set;
}
int qemu_init_main_loop(void)
{
int ret;
sigset_t blocked_signals;
qemu_init_sigbus();
blocked_signals = block_io_signals();
ret = qemu_signalfd_init(blocked_signals);
if (ret) {
return ret;
}
/* Note eventfd must be drained before signalfd handlers run */
ret = qemu_event_init();
if (ret) {
return ret;
}
qemu_cond_init(&qemu_pause_cond);
qemu_cond_init(&qemu_system_cond);
qemu_mutex_init(&qemu_fair_mutex);
qemu_mutex_init(&qemu_global_mutex);
qemu_mutex_lock(&qemu_global_mutex);
qemu_thread_self(&io_thread);
return 0;
}
void qemu_main_loop_start(void)
{
qemu_system_ready = 1;
qemu_cond_broadcast(&qemu_system_cond);
}
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
{
struct qemu_work_item wi;
if (qemu_cpu_self(env)) {
func(data);
return;
}
wi.func = func;
wi.data = data;
if (!env->queued_work_first) {
env->queued_work_first = &wi;
} else {
env->queued_work_last->next = &wi;
}
env->queued_work_last = &wi;
wi.next = NULL;
wi.done = false;
qemu_cpu_kick(env);
while (!wi.done) {
CPUState *self_env = cpu_single_env;
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
cpu_single_env = self_env;
}
}
static void flush_queued_work(CPUState *env)
{
struct qemu_work_item *wi;
if (!env->queued_work_first) {
return;
}
while ((wi = env->queued_work_first)) {
env->queued_work_first = wi->next;
wi->func(wi->data);
wi->done = true;
}
env->queued_work_last = NULL;
qemu_cond_broadcast(&qemu_work_cond);
}
static void qemu_wait_io_event_common(CPUState *env)
{
if (env->stop) {
env->stop = 0;
env->stopped = 1;
qemu_cond_signal(&qemu_pause_cond);
}
flush_queued_work(env);
env->thread_kicked = false;
}
static void qemu_tcg_wait_io_event(void)
{
CPUState *env;
while (all_cpu_threads_idle()) {
qemu_cond_timedwait(tcg_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);
for (env = first_cpu; env != NULL; env = env->next_cpu) {
qemu_wait_io_event_common(env);
}
}
static void qemu_kvm_wait_io_event(CPUState *env)
{
while (cpu_thread_is_idle(env)) {
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
}
qemu_kvm_eat_signals(env);
qemu_wait_io_event_common(env);
}
static void *qemu_kvm_cpu_thread_fn(void *arg)
{
CPUState *env = arg;
int r;
qemu_mutex_lock(&qemu_global_mutex);
qemu_thread_self(env->thread);
r = kvm_init_vcpu(env);
if (r < 0) {
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
exit(1);
}
qemu_kvm_init_cpu_signals(env);
/* signal CPU creation */
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)) {
r = kvm_cpu_exec(env);
if (r == EXCP_DEBUG) {
cpu_handle_debug_exception(env);
}
}
qemu_kvm_wait_io_event(env);
}
return NULL;
}
static void *qemu_tcg_cpu_thread_fn(void *arg)
{
CPUState *env = arg;
qemu_tcg_init_cpu_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) {
cpu_exec_all();
qemu_tcg_wait_io_event();
}
return NULL;
}
void qemu_cpu_kick(void *_env)
{
CPUState *env = _env;
qemu_cond_broadcast(env->halt_cond);
if (!env->thread_kicked) {
qemu_thread_signal(env->thread, SIG_IPI);
env->thread_kicked = true;
}
}
void qemu_cpu_kick_self(void)
{
assert(cpu_single_env);
if (!cpu_single_env->thread_kicked) {
qemu_thread_signal(cpu_single_env->thread, SIG_IPI);
cpu_single_env->thread_kicked = true;
}
}
int qemu_cpu_self(void *_env)
{
CPUState *env = _env;
QemuThread this;
qemu_thread_self(&this);
return qemu_thread_equal(&this, env->thread);
}
void qemu_mutex_lock_iothread(void)
{
if (kvm_enabled()) {
qemu_mutex_lock(&qemu_global_mutex);
} else {
qemu_mutex_lock(&qemu_fair_mutex);
if (qemu_mutex_trylock(&qemu_global_mutex)) {
qemu_thread_signal(tcg_cpu_thread, SIG_IPI);
qemu_mutex_lock(&qemu_global_mutex);
}
qemu_mutex_unlock(&qemu_fair_mutex);
}
}
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_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_cpu_kick(penv);
penv = (CPUState *)penv->next_cpu;
}
}
}
void resume_all_vcpus(void)
{
CPUState *penv = first_cpu;
while (penv) {
penv->stop = 0;
penv->stopped = 0;
qemu_cpu_kick(penv);
penv = (CPUState *)penv->next_cpu;
}
}
static void qemu_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, qemu_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 qemu_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, qemu_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()) {
qemu_kvm_start_vcpu(env);
} else {
qemu_tcg_init_vcpu(env);
}
}
void qemu_notify_event(void)
{
qemu_event_increment();
}
void cpu_stop_current(void)
{
if (cpu_single_env) {
cpu_single_env->stopped = 1;
cpu_exit(cpu_single_env);
}
}
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.
*/
cpu_stop_current();
return;
}
do_vm_stop(reason);
}
#endif
static int tcg_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 cpu_exec_all(void)
{
int r;
if (next_cpu == NULL) {
next_cpu = first_cpu;
}
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
CPUState *env = next_cpu;
qemu_clock_enable(vm_clock,
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
if (qemu_alarm_pending()) {
break;
}
if (cpu_can_run(env)) {
if (kvm_enabled()) {
r = kvm_cpu_exec(env);
qemu_kvm_eat_signals(env);
} else {
r = tcg_cpu_exec(env);
}
if (r == EXCP_DEBUG) {
cpu_handle_debug_exception(env);
break;
}
} else if (env->stop) {
break;
}
}
exit_request = 0;
return !all_cpu_threads_idle();
}
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);
}
/* Return the virtual CPU time, based on the instruction counter. */
int64_t cpu_get_icount(void)
{
int64_t icount;
CPUState *env = cpu_single_env;;
icount = qemu_icount;
if (env) {
if (!can_do_io(env)) {
fprintf(stderr, "Bad clock read\n");
}
icount -= (env->icount_decr.u16.low + env->icount_extra);
}
return qemu_icount_bias + (icount << icount_time_shift);
}
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
{
/* XXX: implement xxx_cpu_list for targets that still miss it */
#if defined(cpu_list_id)
cpu_list_id(f, cpu_fprintf, optarg);
#elif defined(cpu_list)
cpu_list(f, cpu_fprintf); /* deprecated */
#endif
}
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