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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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} |
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|
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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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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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int cpu_is_stopped(CPUState *env)
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{ |
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return !vm_running || env->stopped;
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} |
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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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} |
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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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} |
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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]; |
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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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#else
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HANDLE qemu_event_handle; |
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static void dummy_event_handler(void *opaque) |
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{ |
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} |
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static int qemu_event_init(void) |
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{ |
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qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
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if (!qemu_event_handle) {
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fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
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return -1; |
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} |
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qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
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return 0; |
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} |
242 |
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static void qemu_event_increment(void) |
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{ |
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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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} |
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} |
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#endif
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#ifndef CONFIG_IOTHREAD
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int qemu_init_main_loop(void) |
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{ |
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cpu_set_debug_excp_handler(cpu_debug_handler); |
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return qemu_event_init();
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} |
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void qemu_main_loop_start(void) |
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{ |
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} |
264 |
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void qemu_init_vcpu(void *_env) |
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{ |
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CPUState *env = _env; |
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env->nr_cores = smp_cores; |
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env->nr_threads = smp_threads; |
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if (kvm_enabled())
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kvm_init_vcpu(env); |
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return;
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} |
275 |
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int qemu_cpu_self(void *env) |
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{ |
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return 1; |
279 |
} |
280 |
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void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
282 |
{ |
283 |
func(data); |
284 |
} |
285 |
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void resume_all_vcpus(void) |
287 |
{ |
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} |
289 |
|
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void pause_all_vcpus(void) |
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{ |
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} |
293 |
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void qemu_cpu_kick(void *env) |
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{ |
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return;
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} |
298 |
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void qemu_notify_event(void) |
300 |
{ |
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CPUState *env = cpu_single_env; |
302 |
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qemu_event_increment (); |
304 |
if (env) {
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cpu_exit(env); |
306 |
} |
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if (next_cpu && env != next_cpu) {
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cpu_exit(next_cpu); |
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} |
310 |
} |
311 |
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void qemu_mutex_lock_iothread(void) {} |
313 |
void qemu_mutex_unlock_iothread(void) {} |
314 |
|
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void vm_stop(int reason) |
316 |
{ |
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do_vm_stop(reason); |
318 |
} |
319 |
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#else /* CONFIG_IOTHREAD */ |
321 |
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#include "qemu-thread.h" |
323 |
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QemuMutex qemu_global_mutex; |
325 |
static QemuMutex qemu_fair_mutex;
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static QemuThread io_thread;
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328 |
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static QemuThread *tcg_cpu_thread;
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static QemuCond *tcg_halt_cond;
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|
332 |
static int qemu_system_ready; |
333 |
/* cpu creation */
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static QemuCond qemu_cpu_cond;
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/* system init */
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336 |
static QemuCond qemu_system_cond;
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static QemuCond qemu_pause_cond;
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static QemuCond qemu_work_cond;
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339 |
|
340 |
static void tcg_init_ipi(void); |
341 |
static void kvm_init_ipi(CPUState *env); |
342 |
static sigset_t block_io_signals(void); |
343 |
|
344 |
/* 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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348 |
static void sigfd_handler(void *opaque) |
349 |
{ |
350 |
int fd = (unsigned long) opaque; |
351 |
struct qemu_signalfd_siginfo info;
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352 |
struct sigaction action;
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353 |
ssize_t len; |
354 |
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while (1) { |
356 |
do {
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357 |
len = read(fd, &info, sizeof(info));
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358 |
} while (len == -1 && errno == EINTR); |
359 |
|
360 |
if (len == -1 && errno == EAGAIN) { |
361 |
break;
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362 |
} |
363 |
|
364 |
if (len != sizeof(info)) { |
365 |
printf("read from sigfd returned %zd: %m\n", len);
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366 |
return;
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367 |
} |
368 |
|
369 |
sigaction(info.ssi_signo, NULL, &action);
|
370 |
if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
|
371 |
action.sa_sigaction(info.ssi_signo, |
372 |
(siginfo_t *)&info, NULL);
|
373 |
} else if (action.sa_handler) { |
374 |
action.sa_handler(info.ssi_signo); |
375 |
} |
376 |
} |
377 |
} |
378 |
|
379 |
static int qemu_signalfd_init(sigset_t mask) |
380 |
{ |
381 |
int sigfd;
|
382 |
|
383 |
sigfd = qemu_signalfd(&mask); |
384 |
if (sigfd == -1) { |
385 |
fprintf(stderr, "failed to create signalfd\n");
|
386 |
return -errno;
|
387 |
} |
388 |
|
389 |
fcntl_setfl(sigfd, O_NONBLOCK); |
390 |
|
391 |
qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
392 |
(void *)(unsigned long) sigfd); |
393 |
|
394 |
return 0; |
395 |
} |
396 |
|
397 |
int qemu_init_main_loop(void) |
398 |
{ |
399 |
int ret;
|
400 |
sigset_t blocked_signals; |
401 |
|
402 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
403 |
|
404 |
blocked_signals = block_io_signals(); |
405 |
|
406 |
ret = qemu_signalfd_init(blocked_signals); |
407 |
if (ret)
|
408 |
return ret;
|
409 |
|
410 |
/* Note eventfd must be drained before signalfd handlers run */
|
411 |
ret = qemu_event_init(); |
412 |
if (ret)
|
413 |
return ret;
|
414 |
|
415 |
qemu_cond_init(&qemu_pause_cond); |
416 |
qemu_cond_init(&qemu_system_cond); |
417 |
qemu_mutex_init(&qemu_fair_mutex); |
418 |
qemu_mutex_init(&qemu_global_mutex); |
419 |
qemu_mutex_lock(&qemu_global_mutex); |
420 |
|
421 |
qemu_thread_self(&io_thread); |
422 |
|
423 |
return 0; |
424 |
} |
425 |
|
426 |
void qemu_main_loop_start(void) |
427 |
{ |
428 |
qemu_system_ready = 1;
|
429 |
qemu_cond_broadcast(&qemu_system_cond); |
430 |
} |
431 |
|
432 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
433 |
{ |
434 |
struct qemu_work_item wi;
|
435 |
|
436 |
if (qemu_cpu_self(env)) {
|
437 |
func(data); |
438 |
return;
|
439 |
} |
440 |
|
441 |
wi.func = func; |
442 |
wi.data = data; |
443 |
if (!env->queued_work_first)
|
444 |
env->queued_work_first = &wi; |
445 |
else
|
446 |
env->queued_work_last->next = &wi; |
447 |
env->queued_work_last = &wi; |
448 |
wi.next = NULL;
|
449 |
wi.done = false;
|
450 |
|
451 |
qemu_cpu_kick(env); |
452 |
while (!wi.done) {
|
453 |
CPUState *self_env = cpu_single_env; |
454 |
|
455 |
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); |
456 |
cpu_single_env = self_env; |
457 |
} |
458 |
} |
459 |
|
460 |
static void flush_queued_work(CPUState *env) |
461 |
{ |
462 |
struct qemu_work_item *wi;
|
463 |
|
464 |
if (!env->queued_work_first)
|
465 |
return;
|
466 |
|
467 |
while ((wi = env->queued_work_first)) {
|
468 |
env->queued_work_first = wi->next; |
469 |
wi->func(wi->data); |
470 |
wi->done = true;
|
471 |
} |
472 |
env->queued_work_last = NULL;
|
473 |
qemu_cond_broadcast(&qemu_work_cond); |
474 |
} |
475 |
|
476 |
static void qemu_wait_io_event_common(CPUState *env) |
477 |
{ |
478 |
if (env->stop) {
|
479 |
env->stop = 0;
|
480 |
env->stopped = 1;
|
481 |
qemu_cond_signal(&qemu_pause_cond); |
482 |
} |
483 |
flush_queued_work(env); |
484 |
env->thread_kicked = false;
|
485 |
} |
486 |
|
487 |
static void qemu_tcg_wait_io_event(void) |
488 |
{ |
489 |
CPUState *env; |
490 |
|
491 |
while (!any_cpu_has_work())
|
492 |
qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
|
493 |
|
494 |
qemu_mutex_unlock(&qemu_global_mutex); |
495 |
|
496 |
/*
|
497 |
* Users of qemu_global_mutex can be starved, having no chance
|
498 |
* to acquire it since this path will get to it first.
|
499 |
* So use another lock to provide fairness.
|
500 |
*/
|
501 |
qemu_mutex_lock(&qemu_fair_mutex); |
502 |
qemu_mutex_unlock(&qemu_fair_mutex); |
503 |
|
504 |
qemu_mutex_lock(&qemu_global_mutex); |
505 |
|
506 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
507 |
qemu_wait_io_event_common(env); |
508 |
} |
509 |
} |
510 |
|
511 |
static void sigbus_reraise(void) |
512 |
{ |
513 |
sigset_t set; |
514 |
struct sigaction action;
|
515 |
|
516 |
memset(&action, 0, sizeof(action)); |
517 |
action.sa_handler = SIG_DFL; |
518 |
if (!sigaction(SIGBUS, &action, NULL)) { |
519 |
raise(SIGBUS); |
520 |
sigemptyset(&set); |
521 |
sigaddset(&set, SIGBUS); |
522 |
sigprocmask(SIG_UNBLOCK, &set, NULL);
|
523 |
} |
524 |
perror("Failed to re-raise SIGBUS!\n");
|
525 |
abort(); |
526 |
} |
527 |
|
528 |
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
529 |
void *ctx)
|
530 |
{ |
531 |
#if defined(TARGET_I386)
|
532 |
if (kvm_on_sigbus(siginfo->ssi_code, (void *)(intptr_t)siginfo->ssi_addr)) |
533 |
#endif
|
534 |
sigbus_reraise(); |
535 |
} |
536 |
|
537 |
static void qemu_kvm_eat_signal(CPUState *env, int timeout) |
538 |
{ |
539 |
struct timespec ts;
|
540 |
int r, e;
|
541 |
siginfo_t siginfo; |
542 |
sigset_t waitset; |
543 |
sigset_t chkset; |
544 |
|
545 |
ts.tv_sec = timeout / 1000;
|
546 |
ts.tv_nsec = (timeout % 1000) * 1000000; |
547 |
|
548 |
sigemptyset(&waitset); |
549 |
sigaddset(&waitset, SIG_IPI); |
550 |
sigaddset(&waitset, SIGBUS); |
551 |
|
552 |
do {
|
553 |
qemu_mutex_unlock(&qemu_global_mutex); |
554 |
|
555 |
r = sigtimedwait(&waitset, &siginfo, &ts); |
556 |
e = errno; |
557 |
|
558 |
qemu_mutex_lock(&qemu_global_mutex); |
559 |
|
560 |
if (r == -1 && !(e == EAGAIN || e == EINTR)) { |
561 |
fprintf(stderr, "sigtimedwait: %s\n", strerror(e));
|
562 |
exit(1);
|
563 |
} |
564 |
|
565 |
switch (r) {
|
566 |
case SIGBUS:
|
567 |
#ifdef TARGET_I386
|
568 |
if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr))
|
569 |
#endif
|
570 |
sigbus_reraise(); |
571 |
break;
|
572 |
default:
|
573 |
break;
|
574 |
} |
575 |
|
576 |
r = sigpending(&chkset); |
577 |
if (r == -1) { |
578 |
fprintf(stderr, "sigpending: %s\n", strerror(e));
|
579 |
exit(1);
|
580 |
} |
581 |
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
|
582 |
} |
583 |
|
584 |
static void qemu_kvm_wait_io_event(CPUState *env) |
585 |
{ |
586 |
while (!cpu_has_work(env))
|
587 |
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
|
588 |
|
589 |
qemu_kvm_eat_signal(env, 0);
|
590 |
qemu_wait_io_event_common(env); |
591 |
} |
592 |
|
593 |
static int qemu_cpu_exec(CPUState *env); |
594 |
|
595 |
static void *kvm_cpu_thread_fn(void *arg) |
596 |
{ |
597 |
CPUState *env = arg; |
598 |
|
599 |
qemu_mutex_lock(&qemu_global_mutex); |
600 |
qemu_thread_self(env->thread); |
601 |
if (kvm_enabled())
|
602 |
kvm_init_vcpu(env); |
603 |
|
604 |
kvm_init_ipi(env); |
605 |
|
606 |
/* signal CPU creation */
|
607 |
env->created = 1;
|
608 |
qemu_cond_signal(&qemu_cpu_cond); |
609 |
|
610 |
/* and wait for machine initialization */
|
611 |
while (!qemu_system_ready)
|
612 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
613 |
|
614 |
while (1) { |
615 |
if (cpu_can_run(env))
|
616 |
qemu_cpu_exec(env); |
617 |
qemu_kvm_wait_io_event(env); |
618 |
} |
619 |
|
620 |
return NULL; |
621 |
} |
622 |
|
623 |
static void *tcg_cpu_thread_fn(void *arg) |
624 |
{ |
625 |
CPUState *env = arg; |
626 |
|
627 |
tcg_init_ipi(); |
628 |
qemu_thread_self(env->thread); |
629 |
|
630 |
/* signal CPU creation */
|
631 |
qemu_mutex_lock(&qemu_global_mutex); |
632 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
633 |
env->created = 1;
|
634 |
qemu_cond_signal(&qemu_cpu_cond); |
635 |
|
636 |
/* and wait for machine initialization */
|
637 |
while (!qemu_system_ready)
|
638 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
639 |
|
640 |
while (1) { |
641 |
cpu_exec_all(); |
642 |
qemu_tcg_wait_io_event(); |
643 |
} |
644 |
|
645 |
return NULL; |
646 |
} |
647 |
|
648 |
void qemu_cpu_kick(void *_env) |
649 |
{ |
650 |
CPUState *env = _env; |
651 |
qemu_cond_broadcast(env->halt_cond); |
652 |
if (!env->thread_kicked) {
|
653 |
qemu_thread_signal(env->thread, SIG_IPI); |
654 |
env->thread_kicked = true;
|
655 |
} |
656 |
} |
657 |
|
658 |
int qemu_cpu_self(void *_env) |
659 |
{ |
660 |
CPUState *env = _env; |
661 |
QemuThread this; |
662 |
|
663 |
qemu_thread_self(&this); |
664 |
|
665 |
return qemu_thread_equal(&this, env->thread);
|
666 |
} |
667 |
|
668 |
static void cpu_signal(int sig) |
669 |
{ |
670 |
if (cpu_single_env)
|
671 |
cpu_exit(cpu_single_env); |
672 |
exit_request = 1;
|
673 |
} |
674 |
|
675 |
static void tcg_init_ipi(void) |
676 |
{ |
677 |
sigset_t set; |
678 |
struct sigaction sigact;
|
679 |
|
680 |
memset(&sigact, 0, sizeof(sigact)); |
681 |
sigact.sa_handler = cpu_signal; |
682 |
sigaction(SIG_IPI, &sigact, NULL);
|
683 |
|
684 |
sigemptyset(&set); |
685 |
sigaddset(&set, SIG_IPI); |
686 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
687 |
} |
688 |
|
689 |
static void dummy_signal(int sig) |
690 |
{ |
691 |
} |
692 |
|
693 |
static void kvm_init_ipi(CPUState *env) |
694 |
{ |
695 |
int r;
|
696 |
sigset_t set; |
697 |
struct sigaction sigact;
|
698 |
|
699 |
memset(&sigact, 0, sizeof(sigact)); |
700 |
sigact.sa_handler = dummy_signal; |
701 |
sigaction(SIG_IPI, &sigact, NULL);
|
702 |
|
703 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
704 |
sigdelset(&set, SIG_IPI); |
705 |
sigdelset(&set, SIGBUS); |
706 |
r = kvm_set_signal_mask(env, &set); |
707 |
if (r) {
|
708 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(r));
|
709 |
exit(1);
|
710 |
} |
711 |
} |
712 |
|
713 |
static sigset_t block_io_signals(void) |
714 |
{ |
715 |
sigset_t set; |
716 |
struct sigaction action;
|
717 |
|
718 |
/* SIGUSR2 used by posix-aio-compat.c */
|
719 |
sigemptyset(&set); |
720 |
sigaddset(&set, SIGUSR2); |
721 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
722 |
|
723 |
sigemptyset(&set); |
724 |
sigaddset(&set, SIGIO); |
725 |
sigaddset(&set, SIGALRM); |
726 |
sigaddset(&set, SIG_IPI); |
727 |
sigaddset(&set, SIGBUS); |
728 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
729 |
|
730 |
memset(&action, 0, sizeof(action)); |
731 |
action.sa_flags = SA_SIGINFO; |
732 |
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; |
733 |
sigaction(SIGBUS, &action, NULL);
|
734 |
prctl(PR_MCE_KILL, 1, 1, 0, 0); |
735 |
|
736 |
return set;
|
737 |
} |
738 |
|
739 |
void qemu_mutex_lock_iothread(void) |
740 |
{ |
741 |
if (kvm_enabled()) {
|
742 |
qemu_mutex_lock(&qemu_global_mutex); |
743 |
} else {
|
744 |
qemu_mutex_lock(&qemu_fair_mutex); |
745 |
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
746 |
qemu_thread_signal(tcg_cpu_thread, SIG_IPI); |
747 |
qemu_mutex_lock(&qemu_global_mutex); |
748 |
} |
749 |
qemu_mutex_unlock(&qemu_fair_mutex); |
750 |
} |
751 |
} |
752 |
|
753 |
void qemu_mutex_unlock_iothread(void) |
754 |
{ |
755 |
qemu_mutex_unlock(&qemu_global_mutex); |
756 |
} |
757 |
|
758 |
static int all_vcpus_paused(void) |
759 |
{ |
760 |
CPUState *penv = first_cpu; |
761 |
|
762 |
while (penv) {
|
763 |
if (!penv->stopped)
|
764 |
return 0; |
765 |
penv = (CPUState *)penv->next_cpu; |
766 |
} |
767 |
|
768 |
return 1; |
769 |
} |
770 |
|
771 |
void pause_all_vcpus(void) |
772 |
{ |
773 |
CPUState *penv = first_cpu; |
774 |
|
775 |
while (penv) {
|
776 |
penv->stop = 1;
|
777 |
qemu_cpu_kick(penv); |
778 |
penv = (CPUState *)penv->next_cpu; |
779 |
} |
780 |
|
781 |
while (!all_vcpus_paused()) {
|
782 |
qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
|
783 |
penv = first_cpu; |
784 |
while (penv) {
|
785 |
qemu_cpu_kick(penv); |
786 |
penv = (CPUState *)penv->next_cpu; |
787 |
} |
788 |
} |
789 |
} |
790 |
|
791 |
void resume_all_vcpus(void) |
792 |
{ |
793 |
CPUState *penv = first_cpu; |
794 |
|
795 |
while (penv) {
|
796 |
penv->stop = 0;
|
797 |
penv->stopped = 0;
|
798 |
qemu_cpu_kick(penv); |
799 |
penv = (CPUState *)penv->next_cpu; |
800 |
} |
801 |
} |
802 |
|
803 |
static void tcg_init_vcpu(void *_env) |
804 |
{ |
805 |
CPUState *env = _env; |
806 |
/* share a single thread for all cpus with TCG */
|
807 |
if (!tcg_cpu_thread) {
|
808 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
809 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
810 |
qemu_cond_init(env->halt_cond); |
811 |
qemu_thread_create(env->thread, tcg_cpu_thread_fn, env); |
812 |
while (env->created == 0) |
813 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
814 |
tcg_cpu_thread = env->thread; |
815 |
tcg_halt_cond = env->halt_cond; |
816 |
} else {
|
817 |
env->thread = tcg_cpu_thread; |
818 |
env->halt_cond = tcg_halt_cond; |
819 |
} |
820 |
} |
821 |
|
822 |
static void kvm_start_vcpu(CPUState *env) |
823 |
{ |
824 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
825 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
826 |
qemu_cond_init(env->halt_cond); |
827 |
qemu_thread_create(env->thread, kvm_cpu_thread_fn, env); |
828 |
while (env->created == 0) |
829 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
830 |
} |
831 |
|
832 |
void qemu_init_vcpu(void *_env) |
833 |
{ |
834 |
CPUState *env = _env; |
835 |
|
836 |
env->nr_cores = smp_cores; |
837 |
env->nr_threads = smp_threads; |
838 |
if (kvm_enabled())
|
839 |
kvm_start_vcpu(env); |
840 |
else
|
841 |
tcg_init_vcpu(env); |
842 |
} |
843 |
|
844 |
void qemu_notify_event(void) |
845 |
{ |
846 |
qemu_event_increment(); |
847 |
} |
848 |
|
849 |
static void qemu_system_vmstop_request(int reason) |
850 |
{ |
851 |
vmstop_requested = reason; |
852 |
qemu_notify_event(); |
853 |
} |
854 |
|
855 |
void vm_stop(int reason) |
856 |
{ |
857 |
QemuThread me; |
858 |
qemu_thread_self(&me); |
859 |
|
860 |
if (!qemu_thread_equal(&me, &io_thread)) {
|
861 |
qemu_system_vmstop_request(reason); |
862 |
/*
|
863 |
* FIXME: should not return to device code in case
|
864 |
* vm_stop() has been requested.
|
865 |
*/
|
866 |
if (cpu_single_env) {
|
867 |
cpu_exit(cpu_single_env); |
868 |
cpu_single_env->stop = 1;
|
869 |
} |
870 |
return;
|
871 |
} |
872 |
do_vm_stop(reason); |
873 |
} |
874 |
|
875 |
#endif
|
876 |
|
877 |
static int qemu_cpu_exec(CPUState *env) |
878 |
{ |
879 |
int ret;
|
880 |
#ifdef CONFIG_PROFILER
|
881 |
int64_t ti; |
882 |
#endif
|
883 |
|
884 |
#ifdef CONFIG_PROFILER
|
885 |
ti = profile_getclock(); |
886 |
#endif
|
887 |
if (use_icount) {
|
888 |
int64_t count; |
889 |
int decr;
|
890 |
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
891 |
env->icount_decr.u16.low = 0;
|
892 |
env->icount_extra = 0;
|
893 |
count = qemu_icount_round (qemu_next_deadline()); |
894 |
qemu_icount += count; |
895 |
decr = (count > 0xffff) ? 0xffff : count; |
896 |
count -= decr; |
897 |
env->icount_decr.u16.low = decr; |
898 |
env->icount_extra = count; |
899 |
} |
900 |
ret = cpu_exec(env); |
901 |
#ifdef CONFIG_PROFILER
|
902 |
qemu_time += profile_getclock() - ti; |
903 |
#endif
|
904 |
if (use_icount) {
|
905 |
/* Fold pending instructions back into the
|
906 |
instruction counter, and clear the interrupt flag. */
|
907 |
qemu_icount -= (env->icount_decr.u16.low |
908 |
+ env->icount_extra); |
909 |
env->icount_decr.u32 = 0;
|
910 |
env->icount_extra = 0;
|
911 |
} |
912 |
return ret;
|
913 |
} |
914 |
|
915 |
bool cpu_exec_all(void) |
916 |
{ |
917 |
if (next_cpu == NULL) |
918 |
next_cpu = first_cpu; |
919 |
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
920 |
CPUState *env = next_cpu; |
921 |
|
922 |
qemu_clock_enable(vm_clock, |
923 |
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
924 |
|
925 |
if (qemu_alarm_pending())
|
926 |
break;
|
927 |
if (cpu_can_run(env)) {
|
928 |
if (qemu_cpu_exec(env) == EXCP_DEBUG) {
|
929 |
break;
|
930 |
} |
931 |
} else if (env->stop) { |
932 |
break;
|
933 |
} |
934 |
} |
935 |
exit_request = 0;
|
936 |
return any_cpu_has_work();
|
937 |
} |
938 |
|
939 |
void set_numa_modes(void) |
940 |
{ |
941 |
CPUState *env; |
942 |
int i;
|
943 |
|
944 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
945 |
for (i = 0; i < nb_numa_nodes; i++) { |
946 |
if (node_cpumask[i] & (1 << env->cpu_index)) { |
947 |
env->numa_node = i; |
948 |
} |
949 |
} |
950 |
} |
951 |
} |
952 |
|
953 |
void set_cpu_log(const char *optarg) |
954 |
{ |
955 |
int mask;
|
956 |
const CPULogItem *item;
|
957 |
|
958 |
mask = cpu_str_to_log_mask(optarg); |
959 |
if (!mask) {
|
960 |
printf("Log items (comma separated):\n");
|
961 |
for (item = cpu_log_items; item->mask != 0; item++) { |
962 |
printf("%-10s %s\n", item->name, item->help);
|
963 |
} |
964 |
exit(1);
|
965 |
} |
966 |
cpu_set_log(mask); |
967 |
} |
968 |
|
969 |
/* Return the virtual CPU time, based on the instruction counter. */
|
970 |
int64_t cpu_get_icount(void)
|
971 |
{ |
972 |
int64_t icount; |
973 |
CPUState *env = cpu_single_env;; |
974 |
|
975 |
icount = qemu_icount; |
976 |
if (env) {
|
977 |
if (!can_do_io(env)) {
|
978 |
fprintf(stderr, "Bad clock read\n");
|
979 |
} |
980 |
icount -= (env->icount_decr.u16.low + env->icount_extra); |
981 |
} |
982 |
return qemu_icount_bias + (icount << icount_time_shift);
|
983 |
} |
984 |
|
985 |
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
986 |
{ |
987 |
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
988 |
#if defined(cpu_list_id)
|
989 |
cpu_list_id(f, cpu_fprintf, optarg); |
990 |
#elif defined(cpu_list)
|
991 |
cpu_list(f, cpu_fprintf); /* deprecated */
|
992 |
#endif
|
993 |
} |