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/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* Needed early for CONFIG_BSD etc. */
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#include "config-host.h" |
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#include "monitor.h" |
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#include "sysemu.h" |
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#include "gdbstub.h" |
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#include "dma.h" |
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#include "kvm.h" |
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#include "exec-all.h" |
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#include "cpus.h" |
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#include "compatfd.h" |
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#ifdef CONFIG_LINUX
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#include <sys/prctl.h> |
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#endif
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|
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#ifdef SIGRTMIN
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#define SIG_IPI (SIGRTMIN+4) |
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#else
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#define SIG_IPI SIGUSR1
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#endif
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|
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#ifndef PR_MCE_KILL
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#define PR_MCE_KILL 33 |
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#endif
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static CPUState *next_cpu;
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/***********************************************************/
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void hw_error(const char *fmt, ...) |
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{ |
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va_list ap; |
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CPUState *env; |
58 |
|
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va_start(ap, fmt); |
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fprintf(stderr, "qemu: hardware error: ");
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vfprintf(stderr, fmt, ap); |
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fprintf(stderr, "\n");
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for(env = first_cpu; env != NULL; env = env->next_cpu) { |
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fprintf(stderr, "CPU #%d:\n", env->cpu_index);
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#ifdef TARGET_I386
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cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU); |
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#else
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cpu_dump_state(env, stderr, fprintf, 0);
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#endif
|
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} |
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va_end(ap); |
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abort(); |
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} |
74 |
|
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void cpu_synchronize_all_states(void) |
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{ |
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CPUState *cpu; |
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for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
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cpu_synchronize_state(cpu); |
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} |
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} |
83 |
|
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void cpu_synchronize_all_post_reset(void) |
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{ |
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CPUState *cpu; |
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for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
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cpu_synchronize_post_reset(cpu); |
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} |
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} |
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|
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void cpu_synchronize_all_post_init(void) |
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{ |
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CPUState *cpu; |
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for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
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cpu_synchronize_post_init(cpu); |
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} |
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} |
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|
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int cpu_is_stopped(CPUState *env)
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{ |
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return !vm_running || env->stopped;
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} |
106 |
|
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static void do_vm_stop(int reason) |
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{ |
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if (vm_running) {
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cpu_disable_ticks(); |
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vm_running = 0;
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pause_all_vcpus(); |
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vm_state_notify(0, reason);
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qemu_aio_flush(); |
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bdrv_flush_all(); |
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monitor_protocol_event(QEVENT_STOP, NULL);
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} |
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} |
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|
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static int cpu_can_run(CPUState *env) |
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{ |
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if (env->stop)
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return 0; |
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if (env->stopped || !vm_running)
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return 0; |
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return 1; |
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} |
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|
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static int cpu_has_work(CPUState *env) |
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{ |
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if (env->stop)
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return 1; |
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if (env->queued_work_first)
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return 1; |
135 |
if (env->stopped || !vm_running)
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return 0; |
137 |
if (!env->halted)
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return 1; |
139 |
if (qemu_cpu_has_work(env))
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return 1; |
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return 0; |
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} |
143 |
|
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static int any_cpu_has_work(void) |
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{ |
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CPUState *env; |
147 |
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for (env = first_cpu; env != NULL; env = env->next_cpu) |
149 |
if (cpu_has_work(env))
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return 1; |
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return 0; |
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} |
153 |
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static void cpu_debug_handler(CPUState *env) |
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{ |
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gdb_set_stop_cpu(env); |
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debug_requested = EXCP_DEBUG; |
158 |
vm_stop(EXCP_DEBUG); |
159 |
} |
160 |
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#ifndef _WIN32
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static int io_thread_fd = -1; |
163 |
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static void qemu_event_increment(void) |
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{ |
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/* Write 8 bytes to be compatible with eventfd. */
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static const uint64_t val = 1; |
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ssize_t ret; |
169 |
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if (io_thread_fd == -1) |
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return;
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do {
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ret = write(io_thread_fd, &val, sizeof(val));
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} while (ret < 0 && errno == EINTR); |
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/* EAGAIN is fine, a read must be pending. */
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if (ret < 0 && errno != EAGAIN) { |
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fprintf(stderr, "qemu_event_increment: write() filed: %s\n",
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strerror(errno)); |
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exit (1);
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} |
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} |
184 |
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static void qemu_event_read(void *opaque) |
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{ |
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int fd = (unsigned long)opaque; |
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ssize_t len; |
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char buffer[512]; |
190 |
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/* Drain the notify pipe. For eventfd, only 8 bytes will be read. */
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do {
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len = read(fd, buffer, sizeof(buffer));
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} while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); |
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} |
196 |
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static int qemu_event_init(void) |
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{ |
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int err;
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int fds[2]; |
201 |
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err = qemu_eventfd(fds); |
203 |
if (err == -1) |
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return -errno;
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err = fcntl_setfl(fds[0], O_NONBLOCK);
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if (err < 0) |
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goto fail;
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err = fcntl_setfl(fds[1], O_NONBLOCK);
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if (err < 0) |
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goto fail;
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qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, |
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(void *)(unsigned long)fds[0]); |
216 |
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io_thread_fd = fds[1];
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return 0; |
219 |
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fail:
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close(fds[0]);
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close(fds[1]);
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return err;
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} |
225 |
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static void dummy_signal(int sig) |
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{ |
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} |
229 |
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static void sigbus_reraise(void); |
231 |
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static void qemu_kvm_eat_signals(CPUState *env) |
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{ |
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struct timespec ts = { 0, 0 }; |
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siginfo_t siginfo; |
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sigset_t waitset; |
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sigset_t chkset; |
238 |
int r;
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sigemptyset(&waitset); |
241 |
sigaddset(&waitset, SIG_IPI); |
242 |
sigaddset(&waitset, SIGBUS); |
243 |
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do {
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r = sigtimedwait(&waitset, &siginfo, &ts); |
246 |
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { |
247 |
perror("sigtimedwait");
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exit(1);
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} |
250 |
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switch (r) {
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#ifdef CONFIG_IOTHREAD
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case SIGBUS:
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if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) {
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sigbus_reraise(); |
256 |
} |
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break;
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#endif
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default:
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break;
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} |
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r = sigpending(&chkset); |
264 |
if (r == -1) { |
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perror("sigpending");
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exit(1);
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} |
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} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
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} |
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#else /* _WIN32 */ |
272 |
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HANDLE qemu_event_handle; |
274 |
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static void dummy_event_handler(void *opaque) |
276 |
{ |
277 |
} |
278 |
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static int qemu_event_init(void) |
280 |
{ |
281 |
qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
282 |
if (!qemu_event_handle) {
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fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
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return -1; |
285 |
} |
286 |
qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
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return 0; |
288 |
} |
289 |
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static void qemu_event_increment(void) |
291 |
{ |
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if (!SetEvent(qemu_event_handle)) {
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fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
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GetLastError()); |
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exit (1);
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} |
297 |
} |
298 |
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static void qemu_kvm_eat_signals(CPUState *env) |
300 |
{ |
301 |
} |
302 |
#endif /* _WIN32 */ |
303 |
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#ifndef CONFIG_IOTHREAD
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static void qemu_kvm_init_cpu_signals(CPUState *env) |
306 |
{ |
307 |
#ifndef _WIN32
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int r;
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sigset_t set; |
310 |
struct sigaction sigact;
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|
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memset(&sigact, 0, sizeof(sigact)); |
313 |
sigact.sa_handler = dummy_signal; |
314 |
sigaction(SIG_IPI, &sigact, NULL);
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315 |
|
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sigemptyset(&set); |
317 |
sigaddset(&set, SIG_IPI); |
318 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
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319 |
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pthread_sigmask(SIG_BLOCK, NULL, &set);
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sigdelset(&set, SIG_IPI); |
322 |
sigdelset(&set, SIGBUS); |
323 |
r = kvm_set_signal_mask(env, &set); |
324 |
if (r) {
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fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
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exit(1);
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327 |
} |
328 |
#endif
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} |
330 |
|
331 |
int qemu_init_main_loop(void) |
332 |
{ |
333 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
334 |
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return qemu_event_init();
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} |
337 |
|
338 |
void qemu_main_loop_start(void) |
339 |
{ |
340 |
} |
341 |
|
342 |
void qemu_init_vcpu(void *_env) |
343 |
{ |
344 |
CPUState *env = _env; |
345 |
int r;
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346 |
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env->nr_cores = smp_cores; |
348 |
env->nr_threads = smp_threads; |
349 |
|
350 |
if (kvm_enabled()) {
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351 |
r = kvm_init_vcpu(env); |
352 |
if (r < 0) { |
353 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
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354 |
exit(1);
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355 |
} |
356 |
qemu_kvm_init_cpu_signals(env); |
357 |
} |
358 |
} |
359 |
|
360 |
int qemu_cpu_self(void *env) |
361 |
{ |
362 |
return 1; |
363 |
} |
364 |
|
365 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
366 |
{ |
367 |
func(data); |
368 |
} |
369 |
|
370 |
void resume_all_vcpus(void) |
371 |
{ |
372 |
} |
373 |
|
374 |
void pause_all_vcpus(void) |
375 |
{ |
376 |
} |
377 |
|
378 |
void qemu_cpu_kick(void *env) |
379 |
{ |
380 |
return;
|
381 |
} |
382 |
|
383 |
void qemu_notify_event(void) |
384 |
{ |
385 |
CPUState *env = cpu_single_env; |
386 |
|
387 |
qemu_event_increment (); |
388 |
if (env) {
|
389 |
cpu_exit(env); |
390 |
} |
391 |
if (next_cpu && env != next_cpu) {
|
392 |
cpu_exit(next_cpu); |
393 |
} |
394 |
exit_request = 1;
|
395 |
} |
396 |
|
397 |
void qemu_mutex_lock_iothread(void) {} |
398 |
void qemu_mutex_unlock_iothread(void) {} |
399 |
|
400 |
void cpu_stop_current(void) |
401 |
{ |
402 |
} |
403 |
|
404 |
void vm_stop(int reason) |
405 |
{ |
406 |
do_vm_stop(reason); |
407 |
} |
408 |
|
409 |
#else /* CONFIG_IOTHREAD */ |
410 |
|
411 |
#include "qemu-thread.h" |
412 |
|
413 |
QemuMutex qemu_global_mutex; |
414 |
static QemuMutex qemu_fair_mutex;
|
415 |
|
416 |
static QemuThread io_thread;
|
417 |
|
418 |
static QemuThread *tcg_cpu_thread;
|
419 |
static QemuCond *tcg_halt_cond;
|
420 |
|
421 |
static int qemu_system_ready; |
422 |
/* cpu creation */
|
423 |
static QemuCond qemu_cpu_cond;
|
424 |
/* system init */
|
425 |
static QemuCond qemu_system_cond;
|
426 |
static QemuCond qemu_pause_cond;
|
427 |
static QemuCond qemu_work_cond;
|
428 |
|
429 |
/* If we have signalfd, we mask out the signals we want to handle and then
|
430 |
* use signalfd to listen for them. We rely on whatever the current signal
|
431 |
* handler is to dispatch the signals when we receive them.
|
432 |
*/
|
433 |
static void sigfd_handler(void *opaque) |
434 |
{ |
435 |
int fd = (unsigned long) opaque; |
436 |
struct qemu_signalfd_siginfo info;
|
437 |
struct sigaction action;
|
438 |
ssize_t len; |
439 |
|
440 |
while (1) { |
441 |
do {
|
442 |
len = read(fd, &info, sizeof(info));
|
443 |
} while (len == -1 && errno == EINTR); |
444 |
|
445 |
if (len == -1 && errno == EAGAIN) { |
446 |
break;
|
447 |
} |
448 |
|
449 |
if (len != sizeof(info)) { |
450 |
printf("read from sigfd returned %zd: %m\n", len);
|
451 |
return;
|
452 |
} |
453 |
|
454 |
sigaction(info.ssi_signo, NULL, &action);
|
455 |
if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
|
456 |
action.sa_sigaction(info.ssi_signo, |
457 |
(siginfo_t *)&info, NULL);
|
458 |
} else if (action.sa_handler) { |
459 |
action.sa_handler(info.ssi_signo); |
460 |
} |
461 |
} |
462 |
} |
463 |
|
464 |
static void cpu_signal(int sig) |
465 |
{ |
466 |
if (cpu_single_env) {
|
467 |
cpu_exit(cpu_single_env); |
468 |
} |
469 |
exit_request = 1;
|
470 |
} |
471 |
|
472 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
473 |
{ |
474 |
int r;
|
475 |
sigset_t set; |
476 |
struct sigaction sigact;
|
477 |
|
478 |
memset(&sigact, 0, sizeof(sigact)); |
479 |
sigact.sa_handler = dummy_signal; |
480 |
sigaction(SIG_IPI, &sigact, NULL);
|
481 |
|
482 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
483 |
sigdelset(&set, SIG_IPI); |
484 |
sigdelset(&set, SIGBUS); |
485 |
r = kvm_set_signal_mask(env, &set); |
486 |
if (r) {
|
487 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
488 |
exit(1);
|
489 |
} |
490 |
} |
491 |
|
492 |
static void qemu_tcg_init_cpu_signals(void) |
493 |
{ |
494 |
sigset_t set; |
495 |
struct sigaction sigact;
|
496 |
|
497 |
memset(&sigact, 0, sizeof(sigact)); |
498 |
sigact.sa_handler = cpu_signal; |
499 |
sigaction(SIG_IPI, &sigact, NULL);
|
500 |
|
501 |
sigemptyset(&set); |
502 |
sigaddset(&set, SIG_IPI); |
503 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
504 |
} |
505 |
|
506 |
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
507 |
void *ctx);
|
508 |
|
509 |
static sigset_t block_io_signals(void) |
510 |
{ |
511 |
sigset_t set; |
512 |
struct sigaction action;
|
513 |
|
514 |
/* SIGUSR2 used by posix-aio-compat.c */
|
515 |
sigemptyset(&set); |
516 |
sigaddset(&set, SIGUSR2); |
517 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
518 |
|
519 |
sigemptyset(&set); |
520 |
sigaddset(&set, SIGIO); |
521 |
sigaddset(&set, SIGALRM); |
522 |
sigaddset(&set, SIG_IPI); |
523 |
sigaddset(&set, SIGBUS); |
524 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
525 |
|
526 |
memset(&action, 0, sizeof(action)); |
527 |
action.sa_flags = SA_SIGINFO; |
528 |
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; |
529 |
sigaction(SIGBUS, &action, NULL);
|
530 |
prctl(PR_MCE_KILL, 1, 1, 0, 0); |
531 |
|
532 |
return set;
|
533 |
} |
534 |
|
535 |
static int qemu_signalfd_init(sigset_t mask) |
536 |
{ |
537 |
int sigfd;
|
538 |
|
539 |
sigfd = qemu_signalfd(&mask); |
540 |
if (sigfd == -1) { |
541 |
fprintf(stderr, "failed to create signalfd\n");
|
542 |
return -errno;
|
543 |
} |
544 |
|
545 |
fcntl_setfl(sigfd, O_NONBLOCK); |
546 |
|
547 |
qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
548 |
(void *)(unsigned long) sigfd); |
549 |
|
550 |
return 0; |
551 |
} |
552 |
|
553 |
int qemu_init_main_loop(void) |
554 |
{ |
555 |
int ret;
|
556 |
sigset_t blocked_signals; |
557 |
|
558 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
559 |
|
560 |
blocked_signals = block_io_signals(); |
561 |
|
562 |
ret = qemu_signalfd_init(blocked_signals); |
563 |
if (ret)
|
564 |
return ret;
|
565 |
|
566 |
/* Note eventfd must be drained before signalfd handlers run */
|
567 |
ret = qemu_event_init(); |
568 |
if (ret)
|
569 |
return ret;
|
570 |
|
571 |
qemu_cond_init(&qemu_pause_cond); |
572 |
qemu_cond_init(&qemu_system_cond); |
573 |
qemu_mutex_init(&qemu_fair_mutex); |
574 |
qemu_mutex_init(&qemu_global_mutex); |
575 |
qemu_mutex_lock(&qemu_global_mutex); |
576 |
|
577 |
qemu_thread_self(&io_thread); |
578 |
|
579 |
return 0; |
580 |
} |
581 |
|
582 |
void qemu_main_loop_start(void) |
583 |
{ |
584 |
qemu_system_ready = 1;
|
585 |
qemu_cond_broadcast(&qemu_system_cond); |
586 |
} |
587 |
|
588 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
589 |
{ |
590 |
struct qemu_work_item wi;
|
591 |
|
592 |
if (qemu_cpu_self(env)) {
|
593 |
func(data); |
594 |
return;
|
595 |
} |
596 |
|
597 |
wi.func = func; |
598 |
wi.data = data; |
599 |
if (!env->queued_work_first)
|
600 |
env->queued_work_first = &wi; |
601 |
else
|
602 |
env->queued_work_last->next = &wi; |
603 |
env->queued_work_last = &wi; |
604 |
wi.next = NULL;
|
605 |
wi.done = false;
|
606 |
|
607 |
qemu_cpu_kick(env); |
608 |
while (!wi.done) {
|
609 |
CPUState *self_env = cpu_single_env; |
610 |
|
611 |
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); |
612 |
cpu_single_env = self_env; |
613 |
} |
614 |
} |
615 |
|
616 |
static void flush_queued_work(CPUState *env) |
617 |
{ |
618 |
struct qemu_work_item *wi;
|
619 |
|
620 |
if (!env->queued_work_first)
|
621 |
return;
|
622 |
|
623 |
while ((wi = env->queued_work_first)) {
|
624 |
env->queued_work_first = wi->next; |
625 |
wi->func(wi->data); |
626 |
wi->done = true;
|
627 |
} |
628 |
env->queued_work_last = NULL;
|
629 |
qemu_cond_broadcast(&qemu_work_cond); |
630 |
} |
631 |
|
632 |
static void qemu_wait_io_event_common(CPUState *env) |
633 |
{ |
634 |
if (env->stop) {
|
635 |
env->stop = 0;
|
636 |
env->stopped = 1;
|
637 |
qemu_cond_signal(&qemu_pause_cond); |
638 |
} |
639 |
flush_queued_work(env); |
640 |
env->thread_kicked = false;
|
641 |
} |
642 |
|
643 |
static void qemu_tcg_wait_io_event(void) |
644 |
{ |
645 |
CPUState *env; |
646 |
|
647 |
while (!any_cpu_has_work())
|
648 |
qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
|
649 |
|
650 |
qemu_mutex_unlock(&qemu_global_mutex); |
651 |
|
652 |
/*
|
653 |
* Users of qemu_global_mutex can be starved, having no chance
|
654 |
* to acquire it since this path will get to it first.
|
655 |
* So use another lock to provide fairness.
|
656 |
*/
|
657 |
qemu_mutex_lock(&qemu_fair_mutex); |
658 |
qemu_mutex_unlock(&qemu_fair_mutex); |
659 |
|
660 |
qemu_mutex_lock(&qemu_global_mutex); |
661 |
|
662 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
663 |
qemu_wait_io_event_common(env); |
664 |
} |
665 |
} |
666 |
|
667 |
static void sigbus_reraise(void) |
668 |
{ |
669 |
sigset_t set; |
670 |
struct sigaction action;
|
671 |
|
672 |
memset(&action, 0, sizeof(action)); |
673 |
action.sa_handler = SIG_DFL; |
674 |
if (!sigaction(SIGBUS, &action, NULL)) { |
675 |
raise(SIGBUS); |
676 |
sigemptyset(&set); |
677 |
sigaddset(&set, SIGBUS); |
678 |
sigprocmask(SIG_UNBLOCK, &set, NULL);
|
679 |
} |
680 |
perror("Failed to re-raise SIGBUS!\n");
|
681 |
abort(); |
682 |
} |
683 |
|
684 |
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
685 |
void *ctx)
|
686 |
{ |
687 |
if (kvm_on_sigbus(siginfo->ssi_code, (void *)(intptr_t)siginfo->ssi_addr)) { |
688 |
sigbus_reraise(); |
689 |
} |
690 |
} |
691 |
|
692 |
static void qemu_kvm_wait_io_event(CPUState *env) |
693 |
{ |
694 |
while (!cpu_has_work(env))
|
695 |
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
|
696 |
|
697 |
qemu_kvm_eat_signals(env); |
698 |
qemu_wait_io_event_common(env); |
699 |
} |
700 |
|
701 |
static int qemu_cpu_exec(CPUState *env); |
702 |
|
703 |
static void *kvm_cpu_thread_fn(void *arg) |
704 |
{ |
705 |
CPUState *env = arg; |
706 |
int r;
|
707 |
|
708 |
qemu_mutex_lock(&qemu_global_mutex); |
709 |
qemu_thread_self(env->thread); |
710 |
|
711 |
r = kvm_init_vcpu(env); |
712 |
if (r < 0) { |
713 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
714 |
exit(1);
|
715 |
} |
716 |
|
717 |
qemu_kvm_init_cpu_signals(env); |
718 |
|
719 |
/* signal CPU creation */
|
720 |
env->created = 1;
|
721 |
qemu_cond_signal(&qemu_cpu_cond); |
722 |
|
723 |
/* and wait for machine initialization */
|
724 |
while (!qemu_system_ready)
|
725 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
726 |
|
727 |
while (1) { |
728 |
if (cpu_can_run(env))
|
729 |
qemu_cpu_exec(env); |
730 |
qemu_kvm_wait_io_event(env); |
731 |
} |
732 |
|
733 |
return NULL; |
734 |
} |
735 |
|
736 |
static void *tcg_cpu_thread_fn(void *arg) |
737 |
{ |
738 |
CPUState *env = arg; |
739 |
|
740 |
qemu_tcg_init_cpu_signals(); |
741 |
qemu_thread_self(env->thread); |
742 |
|
743 |
/* signal CPU creation */
|
744 |
qemu_mutex_lock(&qemu_global_mutex); |
745 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
746 |
env->created = 1;
|
747 |
qemu_cond_signal(&qemu_cpu_cond); |
748 |
|
749 |
/* and wait for machine initialization */
|
750 |
while (!qemu_system_ready)
|
751 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
752 |
|
753 |
while (1) { |
754 |
cpu_exec_all(); |
755 |
qemu_tcg_wait_io_event(); |
756 |
} |
757 |
|
758 |
return NULL; |
759 |
} |
760 |
|
761 |
void qemu_cpu_kick(void *_env) |
762 |
{ |
763 |
CPUState *env = _env; |
764 |
qemu_cond_broadcast(env->halt_cond); |
765 |
if (!env->thread_kicked) {
|
766 |
qemu_thread_signal(env->thread, SIG_IPI); |
767 |
env->thread_kicked = true;
|
768 |
} |
769 |
} |
770 |
|
771 |
int qemu_cpu_self(void *_env) |
772 |
{ |
773 |
CPUState *env = _env; |
774 |
QemuThread this; |
775 |
|
776 |
qemu_thread_self(&this); |
777 |
|
778 |
return qemu_thread_equal(&this, env->thread);
|
779 |
} |
780 |
|
781 |
void qemu_mutex_lock_iothread(void) |
782 |
{ |
783 |
if (kvm_enabled()) {
|
784 |
qemu_mutex_lock(&qemu_global_mutex); |
785 |
} else {
|
786 |
qemu_mutex_lock(&qemu_fair_mutex); |
787 |
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
788 |
qemu_thread_signal(tcg_cpu_thread, SIG_IPI); |
789 |
qemu_mutex_lock(&qemu_global_mutex); |
790 |
} |
791 |
qemu_mutex_unlock(&qemu_fair_mutex); |
792 |
} |
793 |
} |
794 |
|
795 |
void qemu_mutex_unlock_iothread(void) |
796 |
{ |
797 |
qemu_mutex_unlock(&qemu_global_mutex); |
798 |
} |
799 |
|
800 |
static int all_vcpus_paused(void) |
801 |
{ |
802 |
CPUState *penv = first_cpu; |
803 |
|
804 |
while (penv) {
|
805 |
if (!penv->stopped)
|
806 |
return 0; |
807 |
penv = (CPUState *)penv->next_cpu; |
808 |
} |
809 |
|
810 |
return 1; |
811 |
} |
812 |
|
813 |
void pause_all_vcpus(void) |
814 |
{ |
815 |
CPUState *penv = first_cpu; |
816 |
|
817 |
while (penv) {
|
818 |
penv->stop = 1;
|
819 |
qemu_cpu_kick(penv); |
820 |
penv = (CPUState *)penv->next_cpu; |
821 |
} |
822 |
|
823 |
while (!all_vcpus_paused()) {
|
824 |
qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
|
825 |
penv = first_cpu; |
826 |
while (penv) {
|
827 |
qemu_cpu_kick(penv); |
828 |
penv = (CPUState *)penv->next_cpu; |
829 |
} |
830 |
} |
831 |
} |
832 |
|
833 |
void resume_all_vcpus(void) |
834 |
{ |
835 |
CPUState *penv = first_cpu; |
836 |
|
837 |
while (penv) {
|
838 |
penv->stop = 0;
|
839 |
penv->stopped = 0;
|
840 |
qemu_cpu_kick(penv); |
841 |
penv = (CPUState *)penv->next_cpu; |
842 |
} |
843 |
} |
844 |
|
845 |
static void tcg_init_vcpu(void *_env) |
846 |
{ |
847 |
CPUState *env = _env; |
848 |
/* share a single thread for all cpus with TCG */
|
849 |
if (!tcg_cpu_thread) {
|
850 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
851 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
852 |
qemu_cond_init(env->halt_cond); |
853 |
qemu_thread_create(env->thread, tcg_cpu_thread_fn, env); |
854 |
while (env->created == 0) |
855 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
856 |
tcg_cpu_thread = env->thread; |
857 |
tcg_halt_cond = env->halt_cond; |
858 |
} else {
|
859 |
env->thread = tcg_cpu_thread; |
860 |
env->halt_cond = tcg_halt_cond; |
861 |
} |
862 |
} |
863 |
|
864 |
static void kvm_start_vcpu(CPUState *env) |
865 |
{ |
866 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
867 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
868 |
qemu_cond_init(env->halt_cond); |
869 |
qemu_thread_create(env->thread, kvm_cpu_thread_fn, env); |
870 |
while (env->created == 0) |
871 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
872 |
} |
873 |
|
874 |
void qemu_init_vcpu(void *_env) |
875 |
{ |
876 |
CPUState *env = _env; |
877 |
|
878 |
env->nr_cores = smp_cores; |
879 |
env->nr_threads = smp_threads; |
880 |
if (kvm_enabled())
|
881 |
kvm_start_vcpu(env); |
882 |
else
|
883 |
tcg_init_vcpu(env); |
884 |
} |
885 |
|
886 |
void qemu_notify_event(void) |
887 |
{ |
888 |
qemu_event_increment(); |
889 |
} |
890 |
|
891 |
static void qemu_system_vmstop_request(int reason) |
892 |
{ |
893 |
vmstop_requested = reason; |
894 |
qemu_notify_event(); |
895 |
} |
896 |
|
897 |
void cpu_stop_current(void) |
898 |
{ |
899 |
if (cpu_single_env) {
|
900 |
cpu_single_env->stopped = 1;
|
901 |
cpu_exit(cpu_single_env); |
902 |
} |
903 |
} |
904 |
|
905 |
void vm_stop(int reason) |
906 |
{ |
907 |
QemuThread me; |
908 |
qemu_thread_self(&me); |
909 |
|
910 |
if (!qemu_thread_equal(&me, &io_thread)) {
|
911 |
qemu_system_vmstop_request(reason); |
912 |
/*
|
913 |
* FIXME: should not return to device code in case
|
914 |
* vm_stop() has been requested.
|
915 |
*/
|
916 |
cpu_stop_current(); |
917 |
return;
|
918 |
} |
919 |
do_vm_stop(reason); |
920 |
} |
921 |
|
922 |
#endif
|
923 |
|
924 |
static int qemu_cpu_exec(CPUState *env) |
925 |
{ |
926 |
int ret;
|
927 |
#ifdef CONFIG_PROFILER
|
928 |
int64_t ti; |
929 |
#endif
|
930 |
|
931 |
#ifdef CONFIG_PROFILER
|
932 |
ti = profile_getclock(); |
933 |
#endif
|
934 |
if (use_icount) {
|
935 |
int64_t count; |
936 |
int decr;
|
937 |
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
938 |
env->icount_decr.u16.low = 0;
|
939 |
env->icount_extra = 0;
|
940 |
count = qemu_icount_round (qemu_next_deadline()); |
941 |
qemu_icount += count; |
942 |
decr = (count > 0xffff) ? 0xffff : count; |
943 |
count -= decr; |
944 |
env->icount_decr.u16.low = decr; |
945 |
env->icount_extra = count; |
946 |
} |
947 |
ret = cpu_exec(env); |
948 |
#ifdef CONFIG_PROFILER
|
949 |
qemu_time += profile_getclock() - ti; |
950 |
#endif
|
951 |
if (use_icount) {
|
952 |
/* Fold pending instructions back into the
|
953 |
instruction counter, and clear the interrupt flag. */
|
954 |
qemu_icount -= (env->icount_decr.u16.low |
955 |
+ env->icount_extra); |
956 |
env->icount_decr.u32 = 0;
|
957 |
env->icount_extra = 0;
|
958 |
} |
959 |
return ret;
|
960 |
} |
961 |
|
962 |
bool cpu_exec_all(void) |
963 |
{ |
964 |
int r;
|
965 |
|
966 |
if (next_cpu == NULL) |
967 |
next_cpu = first_cpu; |
968 |
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
969 |
CPUState *env = next_cpu; |
970 |
|
971 |
qemu_clock_enable(vm_clock, |
972 |
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
973 |
|
974 |
if (qemu_alarm_pending())
|
975 |
break;
|
976 |
if (cpu_can_run(env)) {
|
977 |
r = qemu_cpu_exec(env); |
978 |
if (kvm_enabled()) {
|
979 |
qemu_kvm_eat_signals(env); |
980 |
} |
981 |
if (r == EXCP_DEBUG) {
|
982 |
break;
|
983 |
} |
984 |
} else if (env->stop) { |
985 |
break;
|
986 |
} |
987 |
} |
988 |
exit_request = 0;
|
989 |
return any_cpu_has_work();
|
990 |
} |
991 |
|
992 |
void set_numa_modes(void) |
993 |
{ |
994 |
CPUState *env; |
995 |
int i;
|
996 |
|
997 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
998 |
for (i = 0; i < nb_numa_nodes; i++) { |
999 |
if (node_cpumask[i] & (1 << env->cpu_index)) { |
1000 |
env->numa_node = i; |
1001 |
} |
1002 |
} |
1003 |
} |
1004 |
} |
1005 |
|
1006 |
void set_cpu_log(const char *optarg) |
1007 |
{ |
1008 |
int mask;
|
1009 |
const CPULogItem *item;
|
1010 |
|
1011 |
mask = cpu_str_to_log_mask(optarg); |
1012 |
if (!mask) {
|
1013 |
printf("Log items (comma separated):\n");
|
1014 |
for (item = cpu_log_items; item->mask != 0; item++) { |
1015 |
printf("%-10s %s\n", item->name, item->help);
|
1016 |
} |
1017 |
exit(1);
|
1018 |
} |
1019 |
cpu_set_log(mask); |
1020 |
} |
1021 |
|
1022 |
/* Return the virtual CPU time, based on the instruction counter. */
|
1023 |
int64_t cpu_get_icount(void)
|
1024 |
{ |
1025 |
int64_t icount; |
1026 |
CPUState *env = cpu_single_env;; |
1027 |
|
1028 |
icount = qemu_icount; |
1029 |
if (env) {
|
1030 |
if (!can_do_io(env)) {
|
1031 |
fprintf(stderr, "Bad clock read\n");
|
1032 |
} |
1033 |
icount -= (env->icount_decr.u16.low + env->icount_extra); |
1034 |
} |
1035 |
return qemu_icount_bias + (icount << icount_time_shift);
|
1036 |
} |
1037 |
|
1038 |
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
1039 |
{ |
1040 |
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
1041 |
#if defined(cpu_list_id)
|
1042 |
cpu_list_id(f, cpu_fprintf, optarg); |
1043 |
#elif defined(cpu_list)
|
1044 |
cpu_list(f, cpu_fprintf); /* deprecated */
|
1045 |
#endif
|
1046 |
} |