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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; |
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|
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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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} |
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|
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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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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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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; |
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if (env->stopped || !vm_running)
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return 0; |
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if (!env->halted)
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return 1; |
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if (qemu_cpu_has_work(env))
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return 1; |
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return 0; |
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} |
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static int any_cpu_has_work(void) |
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{ |
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CPUState *env; |
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for (env = first_cpu; env != NULL; env = env->next_cpu) |
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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; |
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vm_stop(EXCP_DEBUG); |
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} |
160 |
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#ifndef _WIN32
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static int io_thread_fd = -1; |
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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; |
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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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} |
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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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} |
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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]; |
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err = qemu_eventfd(fds); |
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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]); |
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io_thread_fd = fds[1];
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return 0; |
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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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} |
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static void dummy_signal(int sig) |
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{ |
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} |
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/* If we have signalfd, we mask out the signals we want to handle and then
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* use signalfd to listen for them. We rely on whatever the current signal
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* handler is to dispatch the signals when we receive them.
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*/
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static void sigfd_handler(void *opaque) |
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{ |
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int fd = (unsigned long) opaque; |
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struct qemu_signalfd_siginfo info;
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struct sigaction action;
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ssize_t len; |
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while (1) { |
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do {
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len = read(fd, &info, sizeof(info));
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} while (len == -1 && errno == EINTR); |
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if (len == -1 && errno == EAGAIN) { |
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break;
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} |
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if (len != sizeof(info)) { |
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printf("read from sigfd returned %zd: %m\n", len);
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return;
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} |
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sigaction(info.ssi_signo, NULL, &action);
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if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
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action.sa_sigaction(info.ssi_signo, |
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(siginfo_t *)&info, NULL);
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} else if (action.sa_handler) { |
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action.sa_handler(info.ssi_signo); |
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} |
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} |
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} |
264 |
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static int qemu_signalfd_init(sigset_t mask) |
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{ |
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int sigfd;
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sigfd = qemu_signalfd(&mask); |
270 |
if (sigfd == -1) { |
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fprintf(stderr, "failed to create signalfd\n");
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return -errno;
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} |
274 |
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fcntl_setfl(sigfd, O_NONBLOCK); |
276 |
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qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
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(void *)(unsigned long) sigfd); |
279 |
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return 0; |
281 |
} |
282 |
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static void sigbus_reraise(void); |
284 |
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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; |
291 |
int r;
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sigemptyset(&waitset); |
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sigaddset(&waitset, SIG_IPI); |
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sigaddset(&waitset, SIGBUS); |
296 |
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do {
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r = sigtimedwait(&waitset, &siginfo, &ts); |
299 |
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { |
300 |
perror("sigtimedwait");
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exit(1);
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} |
303 |
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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(); |
309 |
} |
310 |
break;
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#endif
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default:
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break;
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} |
315 |
|
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r = sigpending(&chkset); |
317 |
if (r == -1) { |
318 |
perror("sigpending");
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exit(1);
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} |
321 |
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
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} |
323 |
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#else /* _WIN32 */ |
325 |
|
326 |
HANDLE qemu_event_handle; |
327 |
|
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static void dummy_event_handler(void *opaque) |
329 |
{ |
330 |
} |
331 |
|
332 |
static int qemu_event_init(void) |
333 |
{ |
334 |
qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
335 |
if (!qemu_event_handle) {
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fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
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return -1; |
338 |
} |
339 |
qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
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return 0; |
341 |
} |
342 |
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static void qemu_event_increment(void) |
344 |
{ |
345 |
if (!SetEvent(qemu_event_handle)) {
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fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
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GetLastError()); |
348 |
exit (1);
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349 |
} |
350 |
} |
351 |
|
352 |
static void qemu_kvm_eat_signals(CPUState *env) |
353 |
{ |
354 |
} |
355 |
#endif /* _WIN32 */ |
356 |
|
357 |
#ifndef CONFIG_IOTHREAD
|
358 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
359 |
{ |
360 |
#ifndef _WIN32
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361 |
int r;
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sigset_t set; |
363 |
struct sigaction sigact;
|
364 |
|
365 |
memset(&sigact, 0, sizeof(sigact)); |
366 |
sigact.sa_handler = dummy_signal; |
367 |
sigaction(SIG_IPI, &sigact, NULL);
|
368 |
|
369 |
sigemptyset(&set); |
370 |
sigaddset(&set, SIG_IPI); |
371 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
372 |
|
373 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
374 |
sigdelset(&set, SIG_IPI); |
375 |
sigdelset(&set, SIGBUS); |
376 |
r = kvm_set_signal_mask(env, &set); |
377 |
if (r) {
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378 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
379 |
exit(1);
|
380 |
} |
381 |
#endif
|
382 |
} |
383 |
|
384 |
int qemu_init_main_loop(void) |
385 |
{ |
386 |
#ifndef _WIN32
|
387 |
sigset_t blocked_signals; |
388 |
int ret;
|
389 |
|
390 |
sigemptyset(&blocked_signals); |
391 |
|
392 |
ret = qemu_signalfd_init(blocked_signals); |
393 |
if (ret) {
|
394 |
return ret;
|
395 |
} |
396 |
#endif
|
397 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
398 |
|
399 |
return qemu_event_init();
|
400 |
} |
401 |
|
402 |
void qemu_main_loop_start(void) |
403 |
{ |
404 |
} |
405 |
|
406 |
void qemu_init_vcpu(void *_env) |
407 |
{ |
408 |
CPUState *env = _env; |
409 |
int r;
|
410 |
|
411 |
env->nr_cores = smp_cores; |
412 |
env->nr_threads = smp_threads; |
413 |
|
414 |
if (kvm_enabled()) {
|
415 |
r = kvm_init_vcpu(env); |
416 |
if (r < 0) { |
417 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
418 |
exit(1);
|
419 |
} |
420 |
qemu_kvm_init_cpu_signals(env); |
421 |
} |
422 |
} |
423 |
|
424 |
int qemu_cpu_self(void *env) |
425 |
{ |
426 |
return 1; |
427 |
} |
428 |
|
429 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
430 |
{ |
431 |
func(data); |
432 |
} |
433 |
|
434 |
void resume_all_vcpus(void) |
435 |
{ |
436 |
} |
437 |
|
438 |
void pause_all_vcpus(void) |
439 |
{ |
440 |
} |
441 |
|
442 |
void qemu_cpu_kick(void *env) |
443 |
{ |
444 |
return;
|
445 |
} |
446 |
|
447 |
void qemu_notify_event(void) |
448 |
{ |
449 |
CPUState *env = cpu_single_env; |
450 |
|
451 |
qemu_event_increment (); |
452 |
if (env) {
|
453 |
cpu_exit(env); |
454 |
} |
455 |
if (next_cpu && env != next_cpu) {
|
456 |
cpu_exit(next_cpu); |
457 |
} |
458 |
exit_request = 1;
|
459 |
} |
460 |
|
461 |
void qemu_mutex_lock_iothread(void) {} |
462 |
void qemu_mutex_unlock_iothread(void) {} |
463 |
|
464 |
void cpu_stop_current(void) |
465 |
{ |
466 |
} |
467 |
|
468 |
void vm_stop(int reason) |
469 |
{ |
470 |
do_vm_stop(reason); |
471 |
} |
472 |
|
473 |
#else /* CONFIG_IOTHREAD */ |
474 |
|
475 |
#include "qemu-thread.h" |
476 |
|
477 |
QemuMutex qemu_global_mutex; |
478 |
static QemuMutex qemu_fair_mutex;
|
479 |
|
480 |
static QemuThread io_thread;
|
481 |
|
482 |
static QemuThread *tcg_cpu_thread;
|
483 |
static QemuCond *tcg_halt_cond;
|
484 |
|
485 |
static int qemu_system_ready; |
486 |
/* cpu creation */
|
487 |
static QemuCond qemu_cpu_cond;
|
488 |
/* system init */
|
489 |
static QemuCond qemu_system_cond;
|
490 |
static QemuCond qemu_pause_cond;
|
491 |
static QemuCond qemu_work_cond;
|
492 |
|
493 |
static void cpu_signal(int sig) |
494 |
{ |
495 |
if (cpu_single_env) {
|
496 |
cpu_exit(cpu_single_env); |
497 |
} |
498 |
exit_request = 1;
|
499 |
} |
500 |
|
501 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
502 |
{ |
503 |
int r;
|
504 |
sigset_t set; |
505 |
struct sigaction sigact;
|
506 |
|
507 |
memset(&sigact, 0, sizeof(sigact)); |
508 |
sigact.sa_handler = dummy_signal; |
509 |
sigaction(SIG_IPI, &sigact, NULL);
|
510 |
|
511 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
512 |
sigdelset(&set, SIG_IPI); |
513 |
sigdelset(&set, SIGBUS); |
514 |
r = kvm_set_signal_mask(env, &set); |
515 |
if (r) {
|
516 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
517 |
exit(1);
|
518 |
} |
519 |
} |
520 |
|
521 |
static void qemu_tcg_init_cpu_signals(void) |
522 |
{ |
523 |
sigset_t set; |
524 |
struct sigaction sigact;
|
525 |
|
526 |
memset(&sigact, 0, sizeof(sigact)); |
527 |
sigact.sa_handler = cpu_signal; |
528 |
sigaction(SIG_IPI, &sigact, NULL);
|
529 |
|
530 |
sigemptyset(&set); |
531 |
sigaddset(&set, SIG_IPI); |
532 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
533 |
} |
534 |
|
535 |
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
536 |
void *ctx);
|
537 |
|
538 |
static sigset_t block_io_signals(void) |
539 |
{ |
540 |
sigset_t set; |
541 |
struct sigaction action;
|
542 |
|
543 |
/* SIGUSR2 used by posix-aio-compat.c */
|
544 |
sigemptyset(&set); |
545 |
sigaddset(&set, SIGUSR2); |
546 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
547 |
|
548 |
sigemptyset(&set); |
549 |
sigaddset(&set, SIGIO); |
550 |
sigaddset(&set, SIGALRM); |
551 |
sigaddset(&set, SIG_IPI); |
552 |
sigaddset(&set, SIGBUS); |
553 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
554 |
|
555 |
memset(&action, 0, sizeof(action)); |
556 |
action.sa_flags = SA_SIGINFO; |
557 |
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; |
558 |
sigaction(SIGBUS, &action, NULL);
|
559 |
prctl(PR_MCE_KILL, 1, 1, 0, 0); |
560 |
|
561 |
return set;
|
562 |
} |
563 |
|
564 |
int qemu_init_main_loop(void) |
565 |
{ |
566 |
int ret;
|
567 |
sigset_t blocked_signals; |
568 |
|
569 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
570 |
|
571 |
blocked_signals = block_io_signals(); |
572 |
|
573 |
ret = qemu_signalfd_init(blocked_signals); |
574 |
if (ret)
|
575 |
return ret;
|
576 |
|
577 |
/* Note eventfd must be drained before signalfd handlers run */
|
578 |
ret = qemu_event_init(); |
579 |
if (ret)
|
580 |
return ret;
|
581 |
|
582 |
qemu_cond_init(&qemu_pause_cond); |
583 |
qemu_cond_init(&qemu_system_cond); |
584 |
qemu_mutex_init(&qemu_fair_mutex); |
585 |
qemu_mutex_init(&qemu_global_mutex); |
586 |
qemu_mutex_lock(&qemu_global_mutex); |
587 |
|
588 |
qemu_thread_self(&io_thread); |
589 |
|
590 |
return 0; |
591 |
} |
592 |
|
593 |
void qemu_main_loop_start(void) |
594 |
{ |
595 |
qemu_system_ready = 1;
|
596 |
qemu_cond_broadcast(&qemu_system_cond); |
597 |
} |
598 |
|
599 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
600 |
{ |
601 |
struct qemu_work_item wi;
|
602 |
|
603 |
if (qemu_cpu_self(env)) {
|
604 |
func(data); |
605 |
return;
|
606 |
} |
607 |
|
608 |
wi.func = func; |
609 |
wi.data = data; |
610 |
if (!env->queued_work_first)
|
611 |
env->queued_work_first = &wi; |
612 |
else
|
613 |
env->queued_work_last->next = &wi; |
614 |
env->queued_work_last = &wi; |
615 |
wi.next = NULL;
|
616 |
wi.done = false;
|
617 |
|
618 |
qemu_cpu_kick(env); |
619 |
while (!wi.done) {
|
620 |
CPUState *self_env = cpu_single_env; |
621 |
|
622 |
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); |
623 |
cpu_single_env = self_env; |
624 |
} |
625 |
} |
626 |
|
627 |
static void flush_queued_work(CPUState *env) |
628 |
{ |
629 |
struct qemu_work_item *wi;
|
630 |
|
631 |
if (!env->queued_work_first)
|
632 |
return;
|
633 |
|
634 |
while ((wi = env->queued_work_first)) {
|
635 |
env->queued_work_first = wi->next; |
636 |
wi->func(wi->data); |
637 |
wi->done = true;
|
638 |
} |
639 |
env->queued_work_last = NULL;
|
640 |
qemu_cond_broadcast(&qemu_work_cond); |
641 |
} |
642 |
|
643 |
static void qemu_wait_io_event_common(CPUState *env) |
644 |
{ |
645 |
if (env->stop) {
|
646 |
env->stop = 0;
|
647 |
env->stopped = 1;
|
648 |
qemu_cond_signal(&qemu_pause_cond); |
649 |
} |
650 |
flush_queued_work(env); |
651 |
env->thread_kicked = false;
|
652 |
} |
653 |
|
654 |
static void qemu_tcg_wait_io_event(void) |
655 |
{ |
656 |
CPUState *env; |
657 |
|
658 |
while (!any_cpu_has_work())
|
659 |
qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
|
660 |
|
661 |
qemu_mutex_unlock(&qemu_global_mutex); |
662 |
|
663 |
/*
|
664 |
* Users of qemu_global_mutex can be starved, having no chance
|
665 |
* to acquire it since this path will get to it first.
|
666 |
* So use another lock to provide fairness.
|
667 |
*/
|
668 |
qemu_mutex_lock(&qemu_fair_mutex); |
669 |
qemu_mutex_unlock(&qemu_fair_mutex); |
670 |
|
671 |
qemu_mutex_lock(&qemu_global_mutex); |
672 |
|
673 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
674 |
qemu_wait_io_event_common(env); |
675 |
} |
676 |
} |
677 |
|
678 |
static void sigbus_reraise(void) |
679 |
{ |
680 |
sigset_t set; |
681 |
struct sigaction action;
|
682 |
|
683 |
memset(&action, 0, sizeof(action)); |
684 |
action.sa_handler = SIG_DFL; |
685 |
if (!sigaction(SIGBUS, &action, NULL)) { |
686 |
raise(SIGBUS); |
687 |
sigemptyset(&set); |
688 |
sigaddset(&set, SIGBUS); |
689 |
sigprocmask(SIG_UNBLOCK, &set, NULL);
|
690 |
} |
691 |
perror("Failed to re-raise SIGBUS!\n");
|
692 |
abort(); |
693 |
} |
694 |
|
695 |
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
696 |
void *ctx)
|
697 |
{ |
698 |
if (kvm_on_sigbus(siginfo->ssi_code, (void *)(intptr_t)siginfo->ssi_addr)) { |
699 |
sigbus_reraise(); |
700 |
} |
701 |
} |
702 |
|
703 |
static void qemu_kvm_wait_io_event(CPUState *env) |
704 |
{ |
705 |
while (!cpu_has_work(env))
|
706 |
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
|
707 |
|
708 |
qemu_kvm_eat_signals(env); |
709 |
qemu_wait_io_event_common(env); |
710 |
} |
711 |
|
712 |
static int qemu_cpu_exec(CPUState *env); |
713 |
|
714 |
static void *kvm_cpu_thread_fn(void *arg) |
715 |
{ |
716 |
CPUState *env = arg; |
717 |
int r;
|
718 |
|
719 |
qemu_mutex_lock(&qemu_global_mutex); |
720 |
qemu_thread_self(env->thread); |
721 |
|
722 |
r = kvm_init_vcpu(env); |
723 |
if (r < 0) { |
724 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
725 |
exit(1);
|
726 |
} |
727 |
|
728 |
qemu_kvm_init_cpu_signals(env); |
729 |
|
730 |
/* signal CPU creation */
|
731 |
env->created = 1;
|
732 |
qemu_cond_signal(&qemu_cpu_cond); |
733 |
|
734 |
/* and wait for machine initialization */
|
735 |
while (!qemu_system_ready)
|
736 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
737 |
|
738 |
while (1) { |
739 |
if (cpu_can_run(env))
|
740 |
qemu_cpu_exec(env); |
741 |
qemu_kvm_wait_io_event(env); |
742 |
} |
743 |
|
744 |
return NULL; |
745 |
} |
746 |
|
747 |
static void *tcg_cpu_thread_fn(void *arg) |
748 |
{ |
749 |
CPUState *env = arg; |
750 |
|
751 |
qemu_tcg_init_cpu_signals(); |
752 |
qemu_thread_self(env->thread); |
753 |
|
754 |
/* signal CPU creation */
|
755 |
qemu_mutex_lock(&qemu_global_mutex); |
756 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
757 |
env->created = 1;
|
758 |
qemu_cond_signal(&qemu_cpu_cond); |
759 |
|
760 |
/* and wait for machine initialization */
|
761 |
while (!qemu_system_ready)
|
762 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
763 |
|
764 |
while (1) { |
765 |
cpu_exec_all(); |
766 |
qemu_tcg_wait_io_event(); |
767 |
} |
768 |
|
769 |
return NULL; |
770 |
} |
771 |
|
772 |
void qemu_cpu_kick(void *_env) |
773 |
{ |
774 |
CPUState *env = _env; |
775 |
qemu_cond_broadcast(env->halt_cond); |
776 |
if (!env->thread_kicked) {
|
777 |
qemu_thread_signal(env->thread, SIG_IPI); |
778 |
env->thread_kicked = true;
|
779 |
} |
780 |
} |
781 |
|
782 |
int qemu_cpu_self(void *_env) |
783 |
{ |
784 |
CPUState *env = _env; |
785 |
QemuThread this; |
786 |
|
787 |
qemu_thread_self(&this); |
788 |
|
789 |
return qemu_thread_equal(&this, env->thread);
|
790 |
} |
791 |
|
792 |
void qemu_mutex_lock_iothread(void) |
793 |
{ |
794 |
if (kvm_enabled()) {
|
795 |
qemu_mutex_lock(&qemu_global_mutex); |
796 |
} else {
|
797 |
qemu_mutex_lock(&qemu_fair_mutex); |
798 |
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
799 |
qemu_thread_signal(tcg_cpu_thread, SIG_IPI); |
800 |
qemu_mutex_lock(&qemu_global_mutex); |
801 |
} |
802 |
qemu_mutex_unlock(&qemu_fair_mutex); |
803 |
} |
804 |
} |
805 |
|
806 |
void qemu_mutex_unlock_iothread(void) |
807 |
{ |
808 |
qemu_mutex_unlock(&qemu_global_mutex); |
809 |
} |
810 |
|
811 |
static int all_vcpus_paused(void) |
812 |
{ |
813 |
CPUState *penv = first_cpu; |
814 |
|
815 |
while (penv) {
|
816 |
if (!penv->stopped)
|
817 |
return 0; |
818 |
penv = (CPUState *)penv->next_cpu; |
819 |
} |
820 |
|
821 |
return 1; |
822 |
} |
823 |
|
824 |
void pause_all_vcpus(void) |
825 |
{ |
826 |
CPUState *penv = first_cpu; |
827 |
|
828 |
while (penv) {
|
829 |
penv->stop = 1;
|
830 |
qemu_cpu_kick(penv); |
831 |
penv = (CPUState *)penv->next_cpu; |
832 |
} |
833 |
|
834 |
while (!all_vcpus_paused()) {
|
835 |
qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
|
836 |
penv = first_cpu; |
837 |
while (penv) {
|
838 |
qemu_cpu_kick(penv); |
839 |
penv = (CPUState *)penv->next_cpu; |
840 |
} |
841 |
} |
842 |
} |
843 |
|
844 |
void resume_all_vcpus(void) |
845 |
{ |
846 |
CPUState *penv = first_cpu; |
847 |
|
848 |
while (penv) {
|
849 |
penv->stop = 0;
|
850 |
penv->stopped = 0;
|
851 |
qemu_cpu_kick(penv); |
852 |
penv = (CPUState *)penv->next_cpu; |
853 |
} |
854 |
} |
855 |
|
856 |
static void tcg_init_vcpu(void *_env) |
857 |
{ |
858 |
CPUState *env = _env; |
859 |
/* share a single thread for all cpus with TCG */
|
860 |
if (!tcg_cpu_thread) {
|
861 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
862 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
863 |
qemu_cond_init(env->halt_cond); |
864 |
qemu_thread_create(env->thread, tcg_cpu_thread_fn, env); |
865 |
while (env->created == 0) |
866 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
867 |
tcg_cpu_thread = env->thread; |
868 |
tcg_halt_cond = env->halt_cond; |
869 |
} else {
|
870 |
env->thread = tcg_cpu_thread; |
871 |
env->halt_cond = tcg_halt_cond; |
872 |
} |
873 |
} |
874 |
|
875 |
static void kvm_start_vcpu(CPUState *env) |
876 |
{ |
877 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
878 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
879 |
qemu_cond_init(env->halt_cond); |
880 |
qemu_thread_create(env->thread, kvm_cpu_thread_fn, env); |
881 |
while (env->created == 0) |
882 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
883 |
} |
884 |
|
885 |
void qemu_init_vcpu(void *_env) |
886 |
{ |
887 |
CPUState *env = _env; |
888 |
|
889 |
env->nr_cores = smp_cores; |
890 |
env->nr_threads = smp_threads; |
891 |
if (kvm_enabled())
|
892 |
kvm_start_vcpu(env); |
893 |
else
|
894 |
tcg_init_vcpu(env); |
895 |
} |
896 |
|
897 |
void qemu_notify_event(void) |
898 |
{ |
899 |
qemu_event_increment(); |
900 |
} |
901 |
|
902 |
static void qemu_system_vmstop_request(int reason) |
903 |
{ |
904 |
vmstop_requested = reason; |
905 |
qemu_notify_event(); |
906 |
} |
907 |
|
908 |
void cpu_stop_current(void) |
909 |
{ |
910 |
if (cpu_single_env) {
|
911 |
cpu_single_env->stopped = 1;
|
912 |
cpu_exit(cpu_single_env); |
913 |
} |
914 |
} |
915 |
|
916 |
void vm_stop(int reason) |
917 |
{ |
918 |
QemuThread me; |
919 |
qemu_thread_self(&me); |
920 |
|
921 |
if (!qemu_thread_equal(&me, &io_thread)) {
|
922 |
qemu_system_vmstop_request(reason); |
923 |
/*
|
924 |
* FIXME: should not return to device code in case
|
925 |
* vm_stop() has been requested.
|
926 |
*/
|
927 |
cpu_stop_current(); |
928 |
return;
|
929 |
} |
930 |
do_vm_stop(reason); |
931 |
} |
932 |
|
933 |
#endif
|
934 |
|
935 |
static int qemu_cpu_exec(CPUState *env) |
936 |
{ |
937 |
int ret;
|
938 |
#ifdef CONFIG_PROFILER
|
939 |
int64_t ti; |
940 |
#endif
|
941 |
|
942 |
#ifdef CONFIG_PROFILER
|
943 |
ti = profile_getclock(); |
944 |
#endif
|
945 |
if (use_icount) {
|
946 |
int64_t count; |
947 |
int decr;
|
948 |
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
949 |
env->icount_decr.u16.low = 0;
|
950 |
env->icount_extra = 0;
|
951 |
count = qemu_icount_round (qemu_next_deadline()); |
952 |
qemu_icount += count; |
953 |
decr = (count > 0xffff) ? 0xffff : count; |
954 |
count -= decr; |
955 |
env->icount_decr.u16.low = decr; |
956 |
env->icount_extra = count; |
957 |
} |
958 |
ret = cpu_exec(env); |
959 |
#ifdef CONFIG_PROFILER
|
960 |
qemu_time += profile_getclock() - ti; |
961 |
#endif
|
962 |
if (use_icount) {
|
963 |
/* Fold pending instructions back into the
|
964 |
instruction counter, and clear the interrupt flag. */
|
965 |
qemu_icount -= (env->icount_decr.u16.low |
966 |
+ env->icount_extra); |
967 |
env->icount_decr.u32 = 0;
|
968 |
env->icount_extra = 0;
|
969 |
} |
970 |
return ret;
|
971 |
} |
972 |
|
973 |
bool cpu_exec_all(void) |
974 |
{ |
975 |
int r;
|
976 |
|
977 |
if (next_cpu == NULL) |
978 |
next_cpu = first_cpu; |
979 |
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
980 |
CPUState *env = next_cpu; |
981 |
|
982 |
qemu_clock_enable(vm_clock, |
983 |
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
984 |
|
985 |
if (qemu_alarm_pending())
|
986 |
break;
|
987 |
if (cpu_can_run(env)) {
|
988 |
r = qemu_cpu_exec(env); |
989 |
if (kvm_enabled()) {
|
990 |
qemu_kvm_eat_signals(env); |
991 |
} |
992 |
if (r == EXCP_DEBUG) {
|
993 |
break;
|
994 |
} |
995 |
} else if (env->stop) { |
996 |
break;
|
997 |
} |
998 |
} |
999 |
exit_request = 0;
|
1000 |
return any_cpu_has_work();
|
1001 |
} |
1002 |
|
1003 |
void set_numa_modes(void) |
1004 |
{ |
1005 |
CPUState *env; |
1006 |
int i;
|
1007 |
|
1008 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1009 |
for (i = 0; i < nb_numa_nodes; i++) { |
1010 |
if (node_cpumask[i] & (1 << env->cpu_index)) { |
1011 |
env->numa_node = i; |
1012 |
} |
1013 |
} |
1014 |
} |
1015 |
} |
1016 |
|
1017 |
void set_cpu_log(const char *optarg) |
1018 |
{ |
1019 |
int mask;
|
1020 |
const CPULogItem *item;
|
1021 |
|
1022 |
mask = cpu_str_to_log_mask(optarg); |
1023 |
if (!mask) {
|
1024 |
printf("Log items (comma separated):\n");
|
1025 |
for (item = cpu_log_items; item->mask != 0; item++) { |
1026 |
printf("%-10s %s\n", item->name, item->help);
|
1027 |
} |
1028 |
exit(1);
|
1029 |
} |
1030 |
cpu_set_log(mask); |
1031 |
} |
1032 |
|
1033 |
/* Return the virtual CPU time, based on the instruction counter. */
|
1034 |
int64_t cpu_get_icount(void)
|
1035 |
{ |
1036 |
int64_t icount; |
1037 |
CPUState *env = cpu_single_env;; |
1038 |
|
1039 |
icount = qemu_icount; |
1040 |
if (env) {
|
1041 |
if (!can_do_io(env)) {
|
1042 |
fprintf(stderr, "Bad clock read\n");
|
1043 |
} |
1044 |
icount -= (env->icount_decr.u16.low + env->icount_extra); |
1045 |
} |
1046 |
return qemu_icount_bias + (icount << icount_time_shift);
|
1047 |
} |
1048 |
|
1049 |
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
1050 |
{ |
1051 |
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
1052 |
#if defined(cpu_list_id)
|
1053 |
cpu_list_id(f, cpu_fprintf, optarg); |
1054 |
#elif defined(cpu_list)
|
1055 |
cpu_list(f, cpu_fprintf); /* deprecated */
|
1056 |
#endif
|
1057 |
} |