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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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|
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#include "monitor.h" |
| 29 |
#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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|
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#include "qemu-thread.h" |
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#include "cpus.h" |
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#include "compatfd.h" |
| 38 |
|
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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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#ifdef CONFIG_LINUX
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|
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#include <sys/prctl.h> |
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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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|
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#ifndef PR_MCE_KILL_SET
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#define PR_MCE_KILL_SET 1 |
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#endif
|
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|
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#ifndef PR_MCE_KILL_EARLY
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#define PR_MCE_KILL_EARLY 1 |
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#endif
|
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|
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#endif /* CONFIG_LINUX */ |
| 62 |
|
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static CPUState *next_cpu;
|
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|
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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); |
| 84 |
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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|
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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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|
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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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|
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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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} |
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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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|
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static int cpu_can_run(CPUState *env) |
| 133 |
{
|
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if (env->stop) {
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return 0; |
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} |
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if (env->stopped || !vm_running) {
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return 0; |
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} |
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return 1; |
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} |
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|
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static bool cpu_thread_is_idle(CPUState *env) |
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{
|
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if (env->stop || env->queued_work_first) {
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return false; |
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} |
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if (env->stopped || !vm_running) {
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return true; |
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} |
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if (!env->halted || qemu_cpu_has_work(env)) {
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return false; |
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} |
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return true; |
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} |
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|
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static bool all_cpu_threads_idle(void) |
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{
|
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CPUState *env; |
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|
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for (env = first_cpu; env != NULL; env = env->next_cpu) { |
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if (!cpu_thread_is_idle(env)) {
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return false; |
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} |
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} |
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return true; |
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} |
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|
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static CPUDebugExcpHandler *debug_excp_handler;
|
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|
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CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler) |
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{
|
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CPUDebugExcpHandler *old_handler = debug_excp_handler; |
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|
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debug_excp_handler = handler; |
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return old_handler;
|
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} |
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|
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static void cpu_handle_debug_exception(CPUState *env) |
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{
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CPUWatchpoint *wp; |
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|
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if (!env->watchpoint_hit) {
|
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QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
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wp->flags &= ~BP_WATCHPOINT_HIT; |
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} |
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} |
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if (debug_excp_handler) {
|
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debug_excp_handler(env); |
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} |
| 191 |
|
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gdb_set_stop_cpu(env); |
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qemu_system_debug_request(); |
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#ifdef CONFIG_IOTHREAD
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env->stopped = 1;
|
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#endif
|
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} |
| 198 |
|
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#ifdef CONFIG_IOTHREAD
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static void cpu_signal(int sig) |
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{
|
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if (cpu_single_env) {
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cpu_exit(cpu_single_env); |
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} |
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exit_request = 1;
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} |
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#endif
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|
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#ifdef CONFIG_LINUX
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static void sigbus_reraise(void) |
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{
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sigset_t set; |
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struct sigaction action;
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|
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memset(&action, 0, sizeof(action)); |
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action.sa_handler = SIG_DFL; |
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if (!sigaction(SIGBUS, &action, NULL)) { |
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raise(SIGBUS); |
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sigemptyset(&set); |
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sigaddset(&set, SIGBUS); |
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sigprocmask(SIG_UNBLOCK, &set, NULL);
|
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} |
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perror("Failed to re-raise SIGBUS!\n");
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abort(); |
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} |
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|
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static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
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void *ctx)
|
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{
|
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if (kvm_on_sigbus(siginfo->ssi_code,
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(void *)(intptr_t)siginfo->ssi_addr)) {
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sigbus_reraise(); |
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} |
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} |
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|
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static void qemu_init_sigbus(void) |
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{
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struct sigaction action;
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|
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memset(&action, 0, sizeof(action)); |
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action.sa_flags = SA_SIGINFO; |
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action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; |
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sigaction(SIGBUS, &action, NULL);
|
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|
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prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); |
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} |
| 247 |
|
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#else /* !CONFIG_LINUX */ |
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|
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static void qemu_init_sigbus(void) |
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{
|
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} |
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#endif /* !CONFIG_LINUX */ |
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|
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#ifndef _WIN32
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static int io_thread_fd = -1; |
| 257 |
|
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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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|
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if (io_thread_fd == -1) { |
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return;
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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err = qemu_eventfd(fds); |
| 297 |
if (err == -1) { |
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return -errno;
|
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} |
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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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} |
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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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} |
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qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, |
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(void *)(unsigned long)fds[0]); |
| 310 |
|
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io_thread_fd = fds[1];
|
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return 0; |
| 313 |
|
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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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} |
| 319 |
|
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static void dummy_signal(int sig) |
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{
|
| 322 |
} |
| 323 |
|
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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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*/
|
| 328 |
static void sigfd_handler(void *opaque) |
| 329 |
{
|
| 330 |
int fd = (unsigned long) opaque; |
| 331 |
struct qemu_signalfd_siginfo info;
|
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struct sigaction action;
|
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ssize_t len; |
| 334 |
|
| 335 |
while (1) { |
| 336 |
do {
|
| 337 |
len = read(fd, &info, sizeof(info));
|
| 338 |
} while (len == -1 && errno == EINTR); |
| 339 |
|
| 340 |
if (len == -1 && errno == EAGAIN) { |
| 341 |
break;
|
| 342 |
} |
| 343 |
|
| 344 |
if (len != sizeof(info)) { |
| 345 |
printf("read from sigfd returned %zd: %m\n", len);
|
| 346 |
return;
|
| 347 |
} |
| 348 |
|
| 349 |
sigaction(info.ssi_signo, NULL, &action);
|
| 350 |
if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
|
| 351 |
action.sa_sigaction(info.ssi_signo, |
| 352 |
(siginfo_t *)&info, NULL);
|
| 353 |
} else if (action.sa_handler) { |
| 354 |
action.sa_handler(info.ssi_signo); |
| 355 |
} |
| 356 |
} |
| 357 |
} |
| 358 |
|
| 359 |
static int qemu_signal_init(void) |
| 360 |
{
|
| 361 |
int sigfd;
|
| 362 |
sigset_t set; |
| 363 |
|
| 364 |
#ifdef CONFIG_IOTHREAD
|
| 365 |
/* SIGUSR2 used by posix-aio-compat.c */
|
| 366 |
sigemptyset(&set); |
| 367 |
sigaddset(&set, SIGUSR2); |
| 368 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
| 369 |
|
| 370 |
sigemptyset(&set); |
| 371 |
sigaddset(&set, SIGIO); |
| 372 |
sigaddset(&set, SIGALRM); |
| 373 |
sigaddset(&set, SIG_IPI); |
| 374 |
sigaddset(&set, SIGBUS); |
| 375 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
| 376 |
#else
|
| 377 |
sigemptyset(&set); |
| 378 |
sigaddset(&set, SIGBUS); |
| 379 |
if (kvm_enabled()) {
|
| 380 |
/*
|
| 381 |
* We need to process timer signals synchronously to avoid a race
|
| 382 |
* between exit_request check and KVM vcpu entry.
|
| 383 |
*/
|
| 384 |
sigaddset(&set, SIGIO); |
| 385 |
sigaddset(&set, SIGALRM); |
| 386 |
} |
| 387 |
#endif
|
| 388 |
|
| 389 |
sigfd = qemu_signalfd(&set); |
| 390 |
if (sigfd == -1) { |
| 391 |
fprintf(stderr, "failed to create signalfd\n");
|
| 392 |
return -errno;
|
| 393 |
} |
| 394 |
|
| 395 |
fcntl_setfl(sigfd, O_NONBLOCK); |
| 396 |
|
| 397 |
qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
| 398 |
(void *)(unsigned long) sigfd); |
| 399 |
|
| 400 |
return 0; |
| 401 |
} |
| 402 |
|
| 403 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
| 404 |
{
|
| 405 |
int r;
|
| 406 |
sigset_t set; |
| 407 |
struct sigaction sigact;
|
| 408 |
|
| 409 |
memset(&sigact, 0, sizeof(sigact)); |
| 410 |
sigact.sa_handler = dummy_signal; |
| 411 |
sigaction(SIG_IPI, &sigact, NULL);
|
| 412 |
|
| 413 |
#ifdef CONFIG_IOTHREAD
|
| 414 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
| 415 |
sigdelset(&set, SIG_IPI); |
| 416 |
sigdelset(&set, SIGBUS); |
| 417 |
r = kvm_set_signal_mask(env, &set); |
| 418 |
if (r) {
|
| 419 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
| 420 |
exit(1);
|
| 421 |
} |
| 422 |
#else
|
| 423 |
sigemptyset(&set); |
| 424 |
sigaddset(&set, SIG_IPI); |
| 425 |
sigaddset(&set, SIGIO); |
| 426 |
sigaddset(&set, SIGALRM); |
| 427 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
| 428 |
|
| 429 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
| 430 |
sigdelset(&set, SIGIO); |
| 431 |
sigdelset(&set, SIGALRM); |
| 432 |
#endif
|
| 433 |
sigdelset(&set, SIG_IPI); |
| 434 |
sigdelset(&set, SIGBUS); |
| 435 |
r = kvm_set_signal_mask(env, &set); |
| 436 |
if (r) {
|
| 437 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
| 438 |
exit(1);
|
| 439 |
} |
| 440 |
} |
| 441 |
|
| 442 |
static void qemu_tcg_init_cpu_signals(void) |
| 443 |
{
|
| 444 |
#ifdef CONFIG_IOTHREAD
|
| 445 |
sigset_t set; |
| 446 |
struct sigaction sigact;
|
| 447 |
|
| 448 |
memset(&sigact, 0, sizeof(sigact)); |
| 449 |
sigact.sa_handler = cpu_signal; |
| 450 |
sigaction(SIG_IPI, &sigact, NULL);
|
| 451 |
|
| 452 |
sigemptyset(&set); |
| 453 |
sigaddset(&set, SIG_IPI); |
| 454 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
| 455 |
#endif
|
| 456 |
} |
| 457 |
|
| 458 |
static void qemu_kvm_eat_signals(CPUState *env) |
| 459 |
{
|
| 460 |
struct timespec ts = { 0, 0 }; |
| 461 |
siginfo_t siginfo; |
| 462 |
sigset_t waitset; |
| 463 |
sigset_t chkset; |
| 464 |
int r;
|
| 465 |
|
| 466 |
sigemptyset(&waitset); |
| 467 |
sigaddset(&waitset, SIG_IPI); |
| 468 |
sigaddset(&waitset, SIGBUS); |
| 469 |
|
| 470 |
do {
|
| 471 |
r = sigtimedwait(&waitset, &siginfo, &ts); |
| 472 |
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { |
| 473 |
perror("sigtimedwait");
|
| 474 |
exit(1);
|
| 475 |
} |
| 476 |
|
| 477 |
switch (r) {
|
| 478 |
case SIGBUS:
|
| 479 |
if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) {
|
| 480 |
sigbus_reraise(); |
| 481 |
} |
| 482 |
break;
|
| 483 |
default:
|
| 484 |
break;
|
| 485 |
} |
| 486 |
|
| 487 |
r = sigpending(&chkset); |
| 488 |
if (r == -1) { |
| 489 |
perror("sigpending");
|
| 490 |
exit(1);
|
| 491 |
} |
| 492 |
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
|
| 493 |
|
| 494 |
#ifndef CONFIG_IOTHREAD
|
| 495 |
if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) {
|
| 496 |
qemu_notify_event(); |
| 497 |
} |
| 498 |
#endif
|
| 499 |
} |
| 500 |
|
| 501 |
#else /* _WIN32 */ |
| 502 |
|
| 503 |
HANDLE qemu_event_handle; |
| 504 |
|
| 505 |
static void dummy_event_handler(void *opaque) |
| 506 |
{
|
| 507 |
} |
| 508 |
|
| 509 |
static int qemu_event_init(void) |
| 510 |
{
|
| 511 |
qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 512 |
if (!qemu_event_handle) {
|
| 513 |
fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
|
| 514 |
return -1; |
| 515 |
} |
| 516 |
qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
|
| 517 |
return 0; |
| 518 |
} |
| 519 |
|
| 520 |
static void qemu_event_increment(void) |
| 521 |
{
|
| 522 |
if (!SetEvent(qemu_event_handle)) {
|
| 523 |
fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
|
| 524 |
GetLastError()); |
| 525 |
exit (1);
|
| 526 |
} |
| 527 |
} |
| 528 |
|
| 529 |
static void qemu_kvm_eat_signals(CPUState *env) |
| 530 |
{
|
| 531 |
} |
| 532 |
|
| 533 |
static int qemu_signal_init(void) |
| 534 |
{
|
| 535 |
return 0; |
| 536 |
} |
| 537 |
|
| 538 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
| 539 |
{
|
| 540 |
abort(); |
| 541 |
} |
| 542 |
|
| 543 |
static void qemu_tcg_init_cpu_signals(void) |
| 544 |
{
|
| 545 |
} |
| 546 |
#endif /* _WIN32 */ |
| 547 |
|
| 548 |
#ifndef CONFIG_IOTHREAD
|
| 549 |
int qemu_init_main_loop(void) |
| 550 |
{
|
| 551 |
int ret;
|
| 552 |
|
| 553 |
ret = qemu_signal_init(); |
| 554 |
if (ret) {
|
| 555 |
return ret;
|
| 556 |
} |
| 557 |
|
| 558 |
qemu_init_sigbus(); |
| 559 |
|
| 560 |
return qemu_event_init();
|
| 561 |
} |
| 562 |
|
| 563 |
void qemu_main_loop_start(void) |
| 564 |
{
|
| 565 |
} |
| 566 |
|
| 567 |
void qemu_init_vcpu(void *_env) |
| 568 |
{
|
| 569 |
CPUState *env = _env; |
| 570 |
int r;
|
| 571 |
|
| 572 |
env->nr_cores = smp_cores; |
| 573 |
env->nr_threads = smp_threads; |
| 574 |
|
| 575 |
if (kvm_enabled()) {
|
| 576 |
r = kvm_init_vcpu(env); |
| 577 |
if (r < 0) { |
| 578 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
| 579 |
exit(1);
|
| 580 |
} |
| 581 |
qemu_kvm_init_cpu_signals(env); |
| 582 |
} else {
|
| 583 |
qemu_tcg_init_cpu_signals(); |
| 584 |
} |
| 585 |
} |
| 586 |
|
| 587 |
int qemu_cpu_is_self(void *env) |
| 588 |
{
|
| 589 |
return 1; |
| 590 |
} |
| 591 |
|
| 592 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
| 593 |
{
|
| 594 |
func(data); |
| 595 |
} |
| 596 |
|
| 597 |
void resume_all_vcpus(void) |
| 598 |
{
|
| 599 |
} |
| 600 |
|
| 601 |
void pause_all_vcpus(void) |
| 602 |
{
|
| 603 |
} |
| 604 |
|
| 605 |
void qemu_cpu_kick(void *env) |
| 606 |
{
|
| 607 |
} |
| 608 |
|
| 609 |
void qemu_cpu_kick_self(void) |
| 610 |
{
|
| 611 |
#ifndef _WIN32
|
| 612 |
assert(cpu_single_env); |
| 613 |
|
| 614 |
raise(SIG_IPI); |
| 615 |
#else
|
| 616 |
abort(); |
| 617 |
#endif
|
| 618 |
} |
| 619 |
|
| 620 |
void qemu_notify_event(void) |
| 621 |
{
|
| 622 |
CPUState *env = cpu_single_env; |
| 623 |
|
| 624 |
qemu_event_increment (); |
| 625 |
if (env) {
|
| 626 |
cpu_exit(env); |
| 627 |
} |
| 628 |
if (next_cpu && env != next_cpu) {
|
| 629 |
cpu_exit(next_cpu); |
| 630 |
} |
| 631 |
exit_request = 1;
|
| 632 |
} |
| 633 |
|
| 634 |
void qemu_mutex_lock_iothread(void) {} |
| 635 |
void qemu_mutex_unlock_iothread(void) {} |
| 636 |
|
| 637 |
void cpu_stop_current(void) |
| 638 |
{
|
| 639 |
} |
| 640 |
|
| 641 |
void vm_stop(int reason) |
| 642 |
{
|
| 643 |
do_vm_stop(reason); |
| 644 |
} |
| 645 |
|
| 646 |
#else /* CONFIG_IOTHREAD */ |
| 647 |
|
| 648 |
QemuMutex qemu_global_mutex; |
| 649 |
static QemuMutex qemu_fair_mutex;
|
| 650 |
|
| 651 |
static QemuThread io_thread;
|
| 652 |
|
| 653 |
static QemuThread *tcg_cpu_thread;
|
| 654 |
static QemuCond *tcg_halt_cond;
|
| 655 |
|
| 656 |
static int qemu_system_ready; |
| 657 |
/* cpu creation */
|
| 658 |
static QemuCond qemu_cpu_cond;
|
| 659 |
/* system init */
|
| 660 |
static QemuCond qemu_system_cond;
|
| 661 |
static QemuCond qemu_pause_cond;
|
| 662 |
static QemuCond qemu_work_cond;
|
| 663 |
|
| 664 |
int qemu_init_main_loop(void) |
| 665 |
{
|
| 666 |
int ret;
|
| 667 |
|
| 668 |
qemu_init_sigbus(); |
| 669 |
|
| 670 |
ret = qemu_signal_init(); |
| 671 |
if (ret) {
|
| 672 |
return ret;
|
| 673 |
} |
| 674 |
|
| 675 |
/* Note eventfd must be drained before signalfd handlers run */
|
| 676 |
ret = qemu_event_init(); |
| 677 |
if (ret) {
|
| 678 |
return ret;
|
| 679 |
} |
| 680 |
|
| 681 |
qemu_cond_init(&qemu_cpu_cond); |
| 682 |
qemu_cond_init(&qemu_system_cond); |
| 683 |
qemu_cond_init(&qemu_pause_cond); |
| 684 |
qemu_cond_init(&qemu_work_cond); |
| 685 |
qemu_mutex_init(&qemu_fair_mutex); |
| 686 |
qemu_mutex_init(&qemu_global_mutex); |
| 687 |
qemu_mutex_lock(&qemu_global_mutex); |
| 688 |
|
| 689 |
qemu_thread_get_self(&io_thread); |
| 690 |
|
| 691 |
return 0; |
| 692 |
} |
| 693 |
|
| 694 |
void qemu_main_loop_start(void) |
| 695 |
{
|
| 696 |
qemu_system_ready = 1;
|
| 697 |
qemu_cond_broadcast(&qemu_system_cond); |
| 698 |
} |
| 699 |
|
| 700 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
| 701 |
{
|
| 702 |
struct qemu_work_item wi;
|
| 703 |
|
| 704 |
if (qemu_cpu_is_self(env)) {
|
| 705 |
func(data); |
| 706 |
return;
|
| 707 |
} |
| 708 |
|
| 709 |
wi.func = func; |
| 710 |
wi.data = data; |
| 711 |
if (!env->queued_work_first) {
|
| 712 |
env->queued_work_first = &wi; |
| 713 |
} else {
|
| 714 |
env->queued_work_last->next = &wi; |
| 715 |
} |
| 716 |
env->queued_work_last = &wi; |
| 717 |
wi.next = NULL;
|
| 718 |
wi.done = false;
|
| 719 |
|
| 720 |
qemu_cpu_kick(env); |
| 721 |
while (!wi.done) {
|
| 722 |
CPUState *self_env = cpu_single_env; |
| 723 |
|
| 724 |
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); |
| 725 |
cpu_single_env = self_env; |
| 726 |
} |
| 727 |
} |
| 728 |
|
| 729 |
static void flush_queued_work(CPUState *env) |
| 730 |
{
|
| 731 |
struct qemu_work_item *wi;
|
| 732 |
|
| 733 |
if (!env->queued_work_first) {
|
| 734 |
return;
|
| 735 |
} |
| 736 |
|
| 737 |
while ((wi = env->queued_work_first)) {
|
| 738 |
env->queued_work_first = wi->next; |
| 739 |
wi->func(wi->data); |
| 740 |
wi->done = true;
|
| 741 |
} |
| 742 |
env->queued_work_last = NULL;
|
| 743 |
qemu_cond_broadcast(&qemu_work_cond); |
| 744 |
} |
| 745 |
|
| 746 |
static void qemu_wait_io_event_common(CPUState *env) |
| 747 |
{
|
| 748 |
if (env->stop) {
|
| 749 |
env->stop = 0;
|
| 750 |
env->stopped = 1;
|
| 751 |
qemu_cond_signal(&qemu_pause_cond); |
| 752 |
} |
| 753 |
flush_queued_work(env); |
| 754 |
env->thread_kicked = false;
|
| 755 |
} |
| 756 |
|
| 757 |
static void qemu_tcg_wait_io_event(void) |
| 758 |
{
|
| 759 |
CPUState *env; |
| 760 |
|
| 761 |
while (all_cpu_threads_idle()) {
|
| 762 |
qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex); |
| 763 |
} |
| 764 |
|
| 765 |
qemu_mutex_unlock(&qemu_global_mutex); |
| 766 |
|
| 767 |
/*
|
| 768 |
* Users of qemu_global_mutex can be starved, having no chance
|
| 769 |
* to acquire it since this path will get to it first.
|
| 770 |
* So use another lock to provide fairness.
|
| 771 |
*/
|
| 772 |
qemu_mutex_lock(&qemu_fair_mutex); |
| 773 |
qemu_mutex_unlock(&qemu_fair_mutex); |
| 774 |
|
| 775 |
qemu_mutex_lock(&qemu_global_mutex); |
| 776 |
|
| 777 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 778 |
qemu_wait_io_event_common(env); |
| 779 |
} |
| 780 |
} |
| 781 |
|
| 782 |
static void qemu_kvm_wait_io_event(CPUState *env) |
| 783 |
{
|
| 784 |
while (cpu_thread_is_idle(env)) {
|
| 785 |
qemu_cond_wait(env->halt_cond, &qemu_global_mutex); |
| 786 |
} |
| 787 |
|
| 788 |
qemu_kvm_eat_signals(env); |
| 789 |
qemu_wait_io_event_common(env); |
| 790 |
} |
| 791 |
|
| 792 |
static void *qemu_kvm_cpu_thread_fn(void *arg) |
| 793 |
{
|
| 794 |
CPUState *env = arg; |
| 795 |
int r;
|
| 796 |
|
| 797 |
qemu_mutex_lock(&qemu_global_mutex); |
| 798 |
qemu_thread_get_self(env->thread); |
| 799 |
|
| 800 |
r = kvm_init_vcpu(env); |
| 801 |
if (r < 0) { |
| 802 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
| 803 |
exit(1);
|
| 804 |
} |
| 805 |
|
| 806 |
qemu_kvm_init_cpu_signals(env); |
| 807 |
|
| 808 |
/* signal CPU creation */
|
| 809 |
env->created = 1;
|
| 810 |
qemu_cond_signal(&qemu_cpu_cond); |
| 811 |
|
| 812 |
/* and wait for machine initialization */
|
| 813 |
while (!qemu_system_ready) {
|
| 814 |
qemu_cond_wait(&qemu_system_cond, &qemu_global_mutex); |
| 815 |
} |
| 816 |
|
| 817 |
while (1) { |
| 818 |
if (cpu_can_run(env)) {
|
| 819 |
r = kvm_cpu_exec(env); |
| 820 |
if (r == EXCP_DEBUG) {
|
| 821 |
cpu_handle_debug_exception(env); |
| 822 |
} |
| 823 |
} |
| 824 |
qemu_kvm_wait_io_event(env); |
| 825 |
} |
| 826 |
|
| 827 |
return NULL; |
| 828 |
} |
| 829 |
|
| 830 |
static void *qemu_tcg_cpu_thread_fn(void *arg) |
| 831 |
{
|
| 832 |
CPUState *env = arg; |
| 833 |
|
| 834 |
qemu_tcg_init_cpu_signals(); |
| 835 |
qemu_thread_get_self(env->thread); |
| 836 |
|
| 837 |
/* signal CPU creation */
|
| 838 |
qemu_mutex_lock(&qemu_global_mutex); |
| 839 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 840 |
env->created = 1;
|
| 841 |
} |
| 842 |
qemu_cond_signal(&qemu_cpu_cond); |
| 843 |
|
| 844 |
/* and wait for machine initialization */
|
| 845 |
while (!qemu_system_ready) {
|
| 846 |
qemu_cond_wait(&qemu_system_cond, &qemu_global_mutex); |
| 847 |
} |
| 848 |
|
| 849 |
while (1) { |
| 850 |
cpu_exec_all(); |
| 851 |
qemu_tcg_wait_io_event(); |
| 852 |
} |
| 853 |
|
| 854 |
return NULL; |
| 855 |
} |
| 856 |
|
| 857 |
void qemu_cpu_kick(void *_env) |
| 858 |
{
|
| 859 |
CPUState *env = _env; |
| 860 |
|
| 861 |
qemu_cond_broadcast(env->halt_cond); |
| 862 |
if (!env->thread_kicked) {
|
| 863 |
qemu_thread_signal(env->thread, SIG_IPI); |
| 864 |
env->thread_kicked = true;
|
| 865 |
} |
| 866 |
} |
| 867 |
|
| 868 |
void qemu_cpu_kick_self(void) |
| 869 |
{
|
| 870 |
assert(cpu_single_env); |
| 871 |
|
| 872 |
if (!cpu_single_env->thread_kicked) {
|
| 873 |
qemu_thread_signal(cpu_single_env->thread, SIG_IPI); |
| 874 |
cpu_single_env->thread_kicked = true;
|
| 875 |
} |
| 876 |
} |
| 877 |
|
| 878 |
int qemu_cpu_is_self(void *_env) |
| 879 |
{
|
| 880 |
CPUState *env = _env; |
| 881 |
|
| 882 |
return qemu_thread_is_self(env->thread);
|
| 883 |
} |
| 884 |
|
| 885 |
void qemu_mutex_lock_iothread(void) |
| 886 |
{
|
| 887 |
if (kvm_enabled()) {
|
| 888 |
qemu_mutex_lock(&qemu_global_mutex); |
| 889 |
} else {
|
| 890 |
qemu_mutex_lock(&qemu_fair_mutex); |
| 891 |
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
| 892 |
qemu_thread_signal(tcg_cpu_thread, SIG_IPI); |
| 893 |
qemu_mutex_lock(&qemu_global_mutex); |
| 894 |
} |
| 895 |
qemu_mutex_unlock(&qemu_fair_mutex); |
| 896 |
} |
| 897 |
} |
| 898 |
|
| 899 |
void qemu_mutex_unlock_iothread(void) |
| 900 |
{
|
| 901 |
qemu_mutex_unlock(&qemu_global_mutex); |
| 902 |
} |
| 903 |
|
| 904 |
static int all_vcpus_paused(void) |
| 905 |
{
|
| 906 |
CPUState *penv = first_cpu; |
| 907 |
|
| 908 |
while (penv) {
|
| 909 |
if (!penv->stopped) {
|
| 910 |
return 0; |
| 911 |
} |
| 912 |
penv = (CPUState *)penv->next_cpu; |
| 913 |
} |
| 914 |
|
| 915 |
return 1; |
| 916 |
} |
| 917 |
|
| 918 |
void pause_all_vcpus(void) |
| 919 |
{
|
| 920 |
CPUState *penv = first_cpu; |
| 921 |
|
| 922 |
while (penv) {
|
| 923 |
penv->stop = 1;
|
| 924 |
qemu_cpu_kick(penv); |
| 925 |
penv = (CPUState *)penv->next_cpu; |
| 926 |
} |
| 927 |
|
| 928 |
while (!all_vcpus_paused()) {
|
| 929 |
qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex); |
| 930 |
penv = first_cpu; |
| 931 |
while (penv) {
|
| 932 |
qemu_cpu_kick(penv); |
| 933 |
penv = (CPUState *)penv->next_cpu; |
| 934 |
} |
| 935 |
} |
| 936 |
} |
| 937 |
|
| 938 |
void resume_all_vcpus(void) |
| 939 |
{
|
| 940 |
CPUState *penv = first_cpu; |
| 941 |
|
| 942 |
while (penv) {
|
| 943 |
penv->stop = 0;
|
| 944 |
penv->stopped = 0;
|
| 945 |
qemu_cpu_kick(penv); |
| 946 |
penv = (CPUState *)penv->next_cpu; |
| 947 |
} |
| 948 |
} |
| 949 |
|
| 950 |
static void qemu_tcg_init_vcpu(void *_env) |
| 951 |
{
|
| 952 |
CPUState *env = _env; |
| 953 |
|
| 954 |
/* share a single thread for all cpus with TCG */
|
| 955 |
if (!tcg_cpu_thread) {
|
| 956 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
| 957 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
| 958 |
qemu_cond_init(env->halt_cond); |
| 959 |
qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env); |
| 960 |
while (env->created == 0) { |
| 961 |
qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); |
| 962 |
} |
| 963 |
tcg_cpu_thread = env->thread; |
| 964 |
tcg_halt_cond = env->halt_cond; |
| 965 |
} else {
|
| 966 |
env->thread = tcg_cpu_thread; |
| 967 |
env->halt_cond = tcg_halt_cond; |
| 968 |
} |
| 969 |
} |
| 970 |
|
| 971 |
static void qemu_kvm_start_vcpu(CPUState *env) |
| 972 |
{
|
| 973 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
| 974 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
| 975 |
qemu_cond_init(env->halt_cond); |
| 976 |
qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env); |
| 977 |
while (env->created == 0) { |
| 978 |
qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); |
| 979 |
} |
| 980 |
} |
| 981 |
|
| 982 |
void qemu_init_vcpu(void *_env) |
| 983 |
{
|
| 984 |
CPUState *env = _env; |
| 985 |
|
| 986 |
env->nr_cores = smp_cores; |
| 987 |
env->nr_threads = smp_threads; |
| 988 |
if (kvm_enabled()) {
|
| 989 |
qemu_kvm_start_vcpu(env); |
| 990 |
} else {
|
| 991 |
qemu_tcg_init_vcpu(env); |
| 992 |
} |
| 993 |
} |
| 994 |
|
| 995 |
void qemu_notify_event(void) |
| 996 |
{
|
| 997 |
qemu_event_increment(); |
| 998 |
} |
| 999 |
|
| 1000 |
void cpu_stop_current(void) |
| 1001 |
{
|
| 1002 |
if (cpu_single_env) {
|
| 1003 |
cpu_single_env->stop = 0;
|
| 1004 |
cpu_single_env->stopped = 1;
|
| 1005 |
cpu_exit(cpu_single_env); |
| 1006 |
qemu_cond_signal(&qemu_pause_cond); |
| 1007 |
} |
| 1008 |
} |
| 1009 |
|
| 1010 |
void vm_stop(int reason) |
| 1011 |
{
|
| 1012 |
if (!qemu_thread_is_self(&io_thread)) {
|
| 1013 |
qemu_system_vmstop_request(reason); |
| 1014 |
/*
|
| 1015 |
* FIXME: should not return to device code in case
|
| 1016 |
* vm_stop() has been requested.
|
| 1017 |
*/
|
| 1018 |
cpu_stop_current(); |
| 1019 |
return;
|
| 1020 |
} |
| 1021 |
do_vm_stop(reason); |
| 1022 |
} |
| 1023 |
|
| 1024 |
#endif
|
| 1025 |
|
| 1026 |
static int tcg_cpu_exec(CPUState *env) |
| 1027 |
{
|
| 1028 |
int ret;
|
| 1029 |
#ifdef CONFIG_PROFILER
|
| 1030 |
int64_t ti; |
| 1031 |
#endif
|
| 1032 |
|
| 1033 |
#ifdef CONFIG_PROFILER
|
| 1034 |
ti = profile_getclock(); |
| 1035 |
#endif
|
| 1036 |
if (use_icount) {
|
| 1037 |
int64_t count; |
| 1038 |
int decr;
|
| 1039 |
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
| 1040 |
env->icount_decr.u16.low = 0;
|
| 1041 |
env->icount_extra = 0;
|
| 1042 |
count = qemu_icount_round (qemu_next_deadline()); |
| 1043 |
qemu_icount += count; |
| 1044 |
decr = (count > 0xffff) ? 0xffff : count; |
| 1045 |
count -= decr; |
| 1046 |
env->icount_decr.u16.low = decr; |
| 1047 |
env->icount_extra = count; |
| 1048 |
} |
| 1049 |
ret = cpu_exec(env); |
| 1050 |
#ifdef CONFIG_PROFILER
|
| 1051 |
qemu_time += profile_getclock() - ti; |
| 1052 |
#endif
|
| 1053 |
if (use_icount) {
|
| 1054 |
/* Fold pending instructions back into the
|
| 1055 |
instruction counter, and clear the interrupt flag. */
|
| 1056 |
qemu_icount -= (env->icount_decr.u16.low |
| 1057 |
+ env->icount_extra); |
| 1058 |
env->icount_decr.u32 = 0;
|
| 1059 |
env->icount_extra = 0;
|
| 1060 |
} |
| 1061 |
return ret;
|
| 1062 |
} |
| 1063 |
|
| 1064 |
bool cpu_exec_all(void) |
| 1065 |
{
|
| 1066 |
int r;
|
| 1067 |
|
| 1068 |
if (next_cpu == NULL) { |
| 1069 |
next_cpu = first_cpu; |
| 1070 |
} |
| 1071 |
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
| 1072 |
CPUState *env = next_cpu; |
| 1073 |
|
| 1074 |
qemu_clock_enable(vm_clock, |
| 1075 |
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
| 1076 |
|
| 1077 |
#ifndef CONFIG_IOTHREAD
|
| 1078 |
if (qemu_alarm_pending()) {
|
| 1079 |
break;
|
| 1080 |
} |
| 1081 |
#endif
|
| 1082 |
if (cpu_can_run(env)) {
|
| 1083 |
if (kvm_enabled()) {
|
| 1084 |
r = kvm_cpu_exec(env); |
| 1085 |
qemu_kvm_eat_signals(env); |
| 1086 |
} else {
|
| 1087 |
r = tcg_cpu_exec(env); |
| 1088 |
} |
| 1089 |
if (r == EXCP_DEBUG) {
|
| 1090 |
cpu_handle_debug_exception(env); |
| 1091 |
break;
|
| 1092 |
} |
| 1093 |
} else if (env->stop || env->stopped) { |
| 1094 |
break;
|
| 1095 |
} |
| 1096 |
} |
| 1097 |
exit_request = 0;
|
| 1098 |
return !all_cpu_threads_idle();
|
| 1099 |
} |
| 1100 |
|
| 1101 |
void set_numa_modes(void) |
| 1102 |
{
|
| 1103 |
CPUState *env; |
| 1104 |
int i;
|
| 1105 |
|
| 1106 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
| 1107 |
for (i = 0; i < nb_numa_nodes; i++) { |
| 1108 |
if (node_cpumask[i] & (1 << env->cpu_index)) { |
| 1109 |
env->numa_node = i; |
| 1110 |
} |
| 1111 |
} |
| 1112 |
} |
| 1113 |
} |
| 1114 |
|
| 1115 |
void set_cpu_log(const char *optarg) |
| 1116 |
{
|
| 1117 |
int mask;
|
| 1118 |
const CPULogItem *item;
|
| 1119 |
|
| 1120 |
mask = cpu_str_to_log_mask(optarg); |
| 1121 |
if (!mask) {
|
| 1122 |
printf("Log items (comma separated):\n");
|
| 1123 |
for (item = cpu_log_items; item->mask != 0; item++) { |
| 1124 |
printf("%-10s %s\n", item->name, item->help);
|
| 1125 |
} |
| 1126 |
exit(1);
|
| 1127 |
} |
| 1128 |
cpu_set_log(mask); |
| 1129 |
} |
| 1130 |
|
| 1131 |
/* Return the virtual CPU time, based on the instruction counter. */
|
| 1132 |
int64_t cpu_get_icount(void)
|
| 1133 |
{
|
| 1134 |
int64_t icount; |
| 1135 |
CPUState *env = cpu_single_env;; |
| 1136 |
|
| 1137 |
icount = qemu_icount; |
| 1138 |
if (env) {
|
| 1139 |
if (!can_do_io(env)) {
|
| 1140 |
fprintf(stderr, "Bad clock read\n");
|
| 1141 |
} |
| 1142 |
icount -= (env->icount_decr.u16.low + env->icount_extra); |
| 1143 |
} |
| 1144 |
return qemu_icount_bias + (icount << icount_time_shift);
|
| 1145 |
} |
| 1146 |
|
| 1147 |
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
| 1148 |
{
|
| 1149 |
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
| 1150 |
#if defined(cpu_list_id)
|
| 1151 |
cpu_list_id(f, cpu_fprintf, optarg); |
| 1152 |
#elif defined(cpu_list)
|
| 1153 |
cpu_list(f, cpu_fprintf); /* deprecated */
|
| 1154 |
#endif
|
| 1155 |
} |