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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 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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#ifdef CONFIG_LINUX
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#include <sys/prctl.h> |
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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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#endif /* CONFIG_LINUX */ |
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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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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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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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|
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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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|
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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; |
135 |
if (env->stopped || !vm_running)
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return 0; |
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return 1; |
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} |
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|
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static int cpu_has_work(CPUState *env) |
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{ |
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if (env->stop)
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return 1; |
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if (env->queued_work_first)
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return 1; |
146 |
if (env->stopped || !vm_running)
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return 0; |
148 |
if (!env->halted)
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return 1; |
150 |
if (qemu_cpu_has_work(env))
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return 1; |
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return 0; |
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} |
154 |
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static int any_cpu_has_work(void) |
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{ |
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CPUState *env; |
158 |
|
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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; |
163 |
} |
164 |
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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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#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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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(); |
188 |
} |
189 |
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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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static void qemu_init_sigbus(void) |
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{ |
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struct sigaction action;
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memset(&action, 0, sizeof(action)); |
204 |
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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prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); |
209 |
} |
210 |
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#else /* !CONFIG_LINUX */ |
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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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#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]); |
273 |
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io_thread_fd = fds[1];
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return 0; |
276 |
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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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} |
282 |
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static void dummy_signal(int sig) |
284 |
{ |
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} |
286 |
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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) |
292 |
{ |
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int fd = (unsigned long) opaque; |
294 |
struct qemu_signalfd_siginfo info;
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struct sigaction action;
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ssize_t len; |
297 |
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while (1) { |
299 |
do {
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len = read(fd, &info, sizeof(info));
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} while (len == -1 && errno == EINTR); |
302 |
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if (len == -1 && errno == EAGAIN) { |
304 |
break;
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} |
306 |
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if (len != sizeof(info)) { |
308 |
printf("read from sigfd returned %zd: %m\n", len);
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return;
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} |
311 |
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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, |
315 |
(siginfo_t *)&info, NULL);
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} else if (action.sa_handler) { |
317 |
action.sa_handler(info.ssi_signo); |
318 |
} |
319 |
} |
320 |
} |
321 |
|
322 |
static int qemu_signalfd_init(sigset_t mask) |
323 |
{ |
324 |
int sigfd;
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325 |
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sigfd = qemu_signalfd(&mask); |
327 |
if (sigfd == -1) { |
328 |
fprintf(stderr, "failed to create signalfd\n");
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return -errno;
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330 |
} |
331 |
|
332 |
fcntl_setfl(sigfd, O_NONBLOCK); |
333 |
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334 |
qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
335 |
(void *)(unsigned long) sigfd); |
336 |
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337 |
return 0; |
338 |
} |
339 |
|
340 |
static void qemu_kvm_eat_signals(CPUState *env) |
341 |
{ |
342 |
struct timespec ts = { 0, 0 }; |
343 |
siginfo_t siginfo; |
344 |
sigset_t waitset; |
345 |
sigset_t chkset; |
346 |
int r;
|
347 |
|
348 |
sigemptyset(&waitset); |
349 |
sigaddset(&waitset, SIG_IPI); |
350 |
sigaddset(&waitset, SIGBUS); |
351 |
|
352 |
do {
|
353 |
r = sigtimedwait(&waitset, &siginfo, &ts); |
354 |
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { |
355 |
perror("sigtimedwait");
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356 |
exit(1);
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357 |
} |
358 |
|
359 |
switch (r) {
|
360 |
case SIGBUS:
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361 |
if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) {
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362 |
sigbus_reraise(); |
363 |
} |
364 |
break;
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365 |
default:
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366 |
break;
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367 |
} |
368 |
|
369 |
r = sigpending(&chkset); |
370 |
if (r == -1) { |
371 |
perror("sigpending");
|
372 |
exit(1);
|
373 |
} |
374 |
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
|
375 |
|
376 |
#ifndef CONFIG_IOTHREAD
|
377 |
if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) {
|
378 |
qemu_notify_event(); |
379 |
} |
380 |
#endif
|
381 |
} |
382 |
|
383 |
#else /* _WIN32 */ |
384 |
|
385 |
HANDLE qemu_event_handle; |
386 |
|
387 |
static void dummy_event_handler(void *opaque) |
388 |
{ |
389 |
} |
390 |
|
391 |
static int qemu_event_init(void) |
392 |
{ |
393 |
qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
394 |
if (!qemu_event_handle) {
|
395 |
fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
|
396 |
return -1; |
397 |
} |
398 |
qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
|
399 |
return 0; |
400 |
} |
401 |
|
402 |
static void qemu_event_increment(void) |
403 |
{ |
404 |
if (!SetEvent(qemu_event_handle)) {
|
405 |
fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
|
406 |
GetLastError()); |
407 |
exit (1);
|
408 |
} |
409 |
} |
410 |
|
411 |
static void qemu_kvm_eat_signals(CPUState *env) |
412 |
{ |
413 |
} |
414 |
#endif /* _WIN32 */ |
415 |
|
416 |
#ifndef CONFIG_IOTHREAD
|
417 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
418 |
{ |
419 |
#ifndef _WIN32
|
420 |
int r;
|
421 |
sigset_t set; |
422 |
struct sigaction sigact;
|
423 |
|
424 |
memset(&sigact, 0, sizeof(sigact)); |
425 |
sigact.sa_handler = dummy_signal; |
426 |
sigaction(SIG_IPI, &sigact, NULL);
|
427 |
|
428 |
sigemptyset(&set); |
429 |
sigaddset(&set, SIG_IPI); |
430 |
sigaddset(&set, SIGIO); |
431 |
sigaddset(&set, SIGALRM); |
432 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
433 |
|
434 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
435 |
sigdelset(&set, SIG_IPI); |
436 |
sigdelset(&set, SIGBUS); |
437 |
sigdelset(&set, SIGIO); |
438 |
sigdelset(&set, SIGALRM); |
439 |
r = kvm_set_signal_mask(env, &set); |
440 |
if (r) {
|
441 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
442 |
exit(1);
|
443 |
} |
444 |
#endif
|
445 |
} |
446 |
|
447 |
#ifndef _WIN32
|
448 |
static sigset_t block_synchronous_signals(void) |
449 |
{ |
450 |
sigset_t set; |
451 |
|
452 |
sigemptyset(&set); |
453 |
sigaddset(&set, SIGBUS); |
454 |
if (kvm_enabled()) {
|
455 |
/*
|
456 |
* We need to process timer signals synchronously to avoid a race
|
457 |
* between exit_request check and KVM vcpu entry.
|
458 |
*/
|
459 |
sigaddset(&set, SIGIO); |
460 |
sigaddset(&set, SIGALRM); |
461 |
} |
462 |
|
463 |
return set;
|
464 |
} |
465 |
#endif
|
466 |
|
467 |
int qemu_init_main_loop(void) |
468 |
{ |
469 |
#ifndef _WIN32
|
470 |
sigset_t blocked_signals; |
471 |
int ret;
|
472 |
|
473 |
blocked_signals = block_synchronous_signals(); |
474 |
|
475 |
ret = qemu_signalfd_init(blocked_signals); |
476 |
if (ret) {
|
477 |
return ret;
|
478 |
} |
479 |
#endif
|
480 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
481 |
|
482 |
qemu_init_sigbus(); |
483 |
|
484 |
return qemu_event_init();
|
485 |
} |
486 |
|
487 |
void qemu_main_loop_start(void) |
488 |
{ |
489 |
} |
490 |
|
491 |
void qemu_init_vcpu(void *_env) |
492 |
{ |
493 |
CPUState *env = _env; |
494 |
int r;
|
495 |
|
496 |
env->nr_cores = smp_cores; |
497 |
env->nr_threads = smp_threads; |
498 |
|
499 |
if (kvm_enabled()) {
|
500 |
r = kvm_init_vcpu(env); |
501 |
if (r < 0) { |
502 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
503 |
exit(1);
|
504 |
} |
505 |
qemu_kvm_init_cpu_signals(env); |
506 |
} |
507 |
} |
508 |
|
509 |
int qemu_cpu_self(void *env) |
510 |
{ |
511 |
return 1; |
512 |
} |
513 |
|
514 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
515 |
{ |
516 |
func(data); |
517 |
} |
518 |
|
519 |
void resume_all_vcpus(void) |
520 |
{ |
521 |
} |
522 |
|
523 |
void pause_all_vcpus(void) |
524 |
{ |
525 |
} |
526 |
|
527 |
void qemu_cpu_kick(void *env) |
528 |
{ |
529 |
return;
|
530 |
} |
531 |
|
532 |
void qemu_cpu_kick_self(void) |
533 |
{ |
534 |
#ifndef _WIN32
|
535 |
assert(cpu_single_env); |
536 |
|
537 |
raise(SIG_IPI); |
538 |
#else
|
539 |
abort(); |
540 |
#endif
|
541 |
} |
542 |
|
543 |
void qemu_notify_event(void) |
544 |
{ |
545 |
CPUState *env = cpu_single_env; |
546 |
|
547 |
qemu_event_increment (); |
548 |
if (env) {
|
549 |
cpu_exit(env); |
550 |
} |
551 |
if (next_cpu && env != next_cpu) {
|
552 |
cpu_exit(next_cpu); |
553 |
} |
554 |
exit_request = 1;
|
555 |
} |
556 |
|
557 |
void qemu_mutex_lock_iothread(void) {} |
558 |
void qemu_mutex_unlock_iothread(void) {} |
559 |
|
560 |
void cpu_stop_current(void) |
561 |
{ |
562 |
} |
563 |
|
564 |
void vm_stop(int reason) |
565 |
{ |
566 |
do_vm_stop(reason); |
567 |
} |
568 |
|
569 |
#else /* CONFIG_IOTHREAD */ |
570 |
|
571 |
#include "qemu-thread.h" |
572 |
|
573 |
QemuMutex qemu_global_mutex; |
574 |
static QemuMutex qemu_fair_mutex;
|
575 |
|
576 |
static QemuThread io_thread;
|
577 |
|
578 |
static QemuThread *tcg_cpu_thread;
|
579 |
static QemuCond *tcg_halt_cond;
|
580 |
|
581 |
static int qemu_system_ready; |
582 |
/* cpu creation */
|
583 |
static QemuCond qemu_cpu_cond;
|
584 |
/* system init */
|
585 |
static QemuCond qemu_system_cond;
|
586 |
static QemuCond qemu_pause_cond;
|
587 |
static QemuCond qemu_work_cond;
|
588 |
|
589 |
static void cpu_signal(int sig) |
590 |
{ |
591 |
if (cpu_single_env) {
|
592 |
cpu_exit(cpu_single_env); |
593 |
} |
594 |
exit_request = 1;
|
595 |
} |
596 |
|
597 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
598 |
{ |
599 |
int r;
|
600 |
sigset_t set; |
601 |
struct sigaction sigact;
|
602 |
|
603 |
memset(&sigact, 0, sizeof(sigact)); |
604 |
sigact.sa_handler = dummy_signal; |
605 |
sigaction(SIG_IPI, &sigact, NULL);
|
606 |
|
607 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
608 |
sigdelset(&set, SIG_IPI); |
609 |
sigdelset(&set, SIGBUS); |
610 |
r = kvm_set_signal_mask(env, &set); |
611 |
if (r) {
|
612 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
613 |
exit(1);
|
614 |
} |
615 |
} |
616 |
|
617 |
static void qemu_tcg_init_cpu_signals(void) |
618 |
{ |
619 |
sigset_t set; |
620 |
struct sigaction sigact;
|
621 |
|
622 |
memset(&sigact, 0, sizeof(sigact)); |
623 |
sigact.sa_handler = cpu_signal; |
624 |
sigaction(SIG_IPI, &sigact, NULL);
|
625 |
|
626 |
sigemptyset(&set); |
627 |
sigaddset(&set, SIG_IPI); |
628 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
629 |
} |
630 |
|
631 |
static sigset_t block_io_signals(void) |
632 |
{ |
633 |
sigset_t set; |
634 |
|
635 |
/* SIGUSR2 used by posix-aio-compat.c */
|
636 |
sigemptyset(&set); |
637 |
sigaddset(&set, SIGUSR2); |
638 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
639 |
|
640 |
sigemptyset(&set); |
641 |
sigaddset(&set, SIGIO); |
642 |
sigaddset(&set, SIGALRM); |
643 |
sigaddset(&set, SIG_IPI); |
644 |
sigaddset(&set, SIGBUS); |
645 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
646 |
|
647 |
return set;
|
648 |
} |
649 |
|
650 |
int qemu_init_main_loop(void) |
651 |
{ |
652 |
int ret;
|
653 |
sigset_t blocked_signals; |
654 |
|
655 |
cpu_set_debug_excp_handler(cpu_debug_handler); |
656 |
|
657 |
qemu_init_sigbus(); |
658 |
|
659 |
blocked_signals = block_io_signals(); |
660 |
|
661 |
ret = qemu_signalfd_init(blocked_signals); |
662 |
if (ret)
|
663 |
return ret;
|
664 |
|
665 |
/* Note eventfd must be drained before signalfd handlers run */
|
666 |
ret = qemu_event_init(); |
667 |
if (ret)
|
668 |
return ret;
|
669 |
|
670 |
qemu_cond_init(&qemu_pause_cond); |
671 |
qemu_cond_init(&qemu_system_cond); |
672 |
qemu_mutex_init(&qemu_fair_mutex); |
673 |
qemu_mutex_init(&qemu_global_mutex); |
674 |
qemu_mutex_lock(&qemu_global_mutex); |
675 |
|
676 |
qemu_thread_self(&io_thread); |
677 |
|
678 |
return 0; |
679 |
} |
680 |
|
681 |
void qemu_main_loop_start(void) |
682 |
{ |
683 |
qemu_system_ready = 1;
|
684 |
qemu_cond_broadcast(&qemu_system_cond); |
685 |
} |
686 |
|
687 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
688 |
{ |
689 |
struct qemu_work_item wi;
|
690 |
|
691 |
if (qemu_cpu_self(env)) {
|
692 |
func(data); |
693 |
return;
|
694 |
} |
695 |
|
696 |
wi.func = func; |
697 |
wi.data = data; |
698 |
if (!env->queued_work_first)
|
699 |
env->queued_work_first = &wi; |
700 |
else
|
701 |
env->queued_work_last->next = &wi; |
702 |
env->queued_work_last = &wi; |
703 |
wi.next = NULL;
|
704 |
wi.done = false;
|
705 |
|
706 |
qemu_cpu_kick(env); |
707 |
while (!wi.done) {
|
708 |
CPUState *self_env = cpu_single_env; |
709 |
|
710 |
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); |
711 |
cpu_single_env = self_env; |
712 |
} |
713 |
} |
714 |
|
715 |
static void flush_queued_work(CPUState *env) |
716 |
{ |
717 |
struct qemu_work_item *wi;
|
718 |
|
719 |
if (!env->queued_work_first)
|
720 |
return;
|
721 |
|
722 |
while ((wi = env->queued_work_first)) {
|
723 |
env->queued_work_first = wi->next; |
724 |
wi->func(wi->data); |
725 |
wi->done = true;
|
726 |
} |
727 |
env->queued_work_last = NULL;
|
728 |
qemu_cond_broadcast(&qemu_work_cond); |
729 |
} |
730 |
|
731 |
static void qemu_wait_io_event_common(CPUState *env) |
732 |
{ |
733 |
if (env->stop) {
|
734 |
env->stop = 0;
|
735 |
env->stopped = 1;
|
736 |
qemu_cond_signal(&qemu_pause_cond); |
737 |
} |
738 |
flush_queued_work(env); |
739 |
env->thread_kicked = false;
|
740 |
} |
741 |
|
742 |
static void qemu_tcg_wait_io_event(void) |
743 |
{ |
744 |
CPUState *env; |
745 |
|
746 |
while (!any_cpu_has_work())
|
747 |
qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
|
748 |
|
749 |
qemu_mutex_unlock(&qemu_global_mutex); |
750 |
|
751 |
/*
|
752 |
* Users of qemu_global_mutex can be starved, having no chance
|
753 |
* to acquire it since this path will get to it first.
|
754 |
* So use another lock to provide fairness.
|
755 |
*/
|
756 |
qemu_mutex_lock(&qemu_fair_mutex); |
757 |
qemu_mutex_unlock(&qemu_fair_mutex); |
758 |
|
759 |
qemu_mutex_lock(&qemu_global_mutex); |
760 |
|
761 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
762 |
qemu_wait_io_event_common(env); |
763 |
} |
764 |
} |
765 |
|
766 |
static void qemu_kvm_wait_io_event(CPUState *env) |
767 |
{ |
768 |
while (!cpu_has_work(env))
|
769 |
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
|
770 |
|
771 |
qemu_kvm_eat_signals(env); |
772 |
qemu_wait_io_event_common(env); |
773 |
} |
774 |
|
775 |
static int qemu_cpu_exec(CPUState *env); |
776 |
|
777 |
static void *qemu_kvm_cpu_thread_fn(void *arg) |
778 |
{ |
779 |
CPUState *env = arg; |
780 |
int r;
|
781 |
|
782 |
qemu_mutex_lock(&qemu_global_mutex); |
783 |
qemu_thread_self(env->thread); |
784 |
|
785 |
r = kvm_init_vcpu(env); |
786 |
if (r < 0) { |
787 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
788 |
exit(1);
|
789 |
} |
790 |
|
791 |
qemu_kvm_init_cpu_signals(env); |
792 |
|
793 |
/* signal CPU creation */
|
794 |
env->created = 1;
|
795 |
qemu_cond_signal(&qemu_cpu_cond); |
796 |
|
797 |
/* and wait for machine initialization */
|
798 |
while (!qemu_system_ready)
|
799 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
800 |
|
801 |
while (1) { |
802 |
if (cpu_can_run(env))
|
803 |
qemu_cpu_exec(env); |
804 |
qemu_kvm_wait_io_event(env); |
805 |
} |
806 |
|
807 |
return NULL; |
808 |
} |
809 |
|
810 |
static void *qemu_tcg_cpu_thread_fn(void *arg) |
811 |
{ |
812 |
CPUState *env = arg; |
813 |
|
814 |
qemu_tcg_init_cpu_signals(); |
815 |
qemu_thread_self(env->thread); |
816 |
|
817 |
/* signal CPU creation */
|
818 |
qemu_mutex_lock(&qemu_global_mutex); |
819 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
820 |
env->created = 1;
|
821 |
qemu_cond_signal(&qemu_cpu_cond); |
822 |
|
823 |
/* and wait for machine initialization */
|
824 |
while (!qemu_system_ready)
|
825 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
826 |
|
827 |
while (1) { |
828 |
cpu_exec_all(); |
829 |
qemu_tcg_wait_io_event(); |
830 |
} |
831 |
|
832 |
return NULL; |
833 |
} |
834 |
|
835 |
void qemu_cpu_kick(void *_env) |
836 |
{ |
837 |
CPUState *env = _env; |
838 |
qemu_cond_broadcast(env->halt_cond); |
839 |
if (!env->thread_kicked) {
|
840 |
qemu_thread_signal(env->thread, SIG_IPI); |
841 |
env->thread_kicked = true;
|
842 |
} |
843 |
} |
844 |
|
845 |
void qemu_cpu_kick_self(void) |
846 |
{ |
847 |
assert(cpu_single_env); |
848 |
|
849 |
if (!cpu_single_env->thread_kicked) {
|
850 |
qemu_thread_signal(cpu_single_env->thread, SIG_IPI); |
851 |
cpu_single_env->thread_kicked = true;
|
852 |
} |
853 |
} |
854 |
|
855 |
int qemu_cpu_self(void *_env) |
856 |
{ |
857 |
CPUState *env = _env; |
858 |
QemuThread this; |
859 |
|
860 |
qemu_thread_self(&this); |
861 |
|
862 |
return qemu_thread_equal(&this, env->thread);
|
863 |
} |
864 |
|
865 |
void qemu_mutex_lock_iothread(void) |
866 |
{ |
867 |
if (kvm_enabled()) {
|
868 |
qemu_mutex_lock(&qemu_global_mutex); |
869 |
} else {
|
870 |
qemu_mutex_lock(&qemu_fair_mutex); |
871 |
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
872 |
qemu_thread_signal(tcg_cpu_thread, SIG_IPI); |
873 |
qemu_mutex_lock(&qemu_global_mutex); |
874 |
} |
875 |
qemu_mutex_unlock(&qemu_fair_mutex); |
876 |
} |
877 |
} |
878 |
|
879 |
void qemu_mutex_unlock_iothread(void) |
880 |
{ |
881 |
qemu_mutex_unlock(&qemu_global_mutex); |
882 |
} |
883 |
|
884 |
static int all_vcpus_paused(void) |
885 |
{ |
886 |
CPUState *penv = first_cpu; |
887 |
|
888 |
while (penv) {
|
889 |
if (!penv->stopped)
|
890 |
return 0; |
891 |
penv = (CPUState *)penv->next_cpu; |
892 |
} |
893 |
|
894 |
return 1; |
895 |
} |
896 |
|
897 |
void pause_all_vcpus(void) |
898 |
{ |
899 |
CPUState *penv = first_cpu; |
900 |
|
901 |
while (penv) {
|
902 |
penv->stop = 1;
|
903 |
qemu_cpu_kick(penv); |
904 |
penv = (CPUState *)penv->next_cpu; |
905 |
} |
906 |
|
907 |
while (!all_vcpus_paused()) {
|
908 |
qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
|
909 |
penv = first_cpu; |
910 |
while (penv) {
|
911 |
qemu_cpu_kick(penv); |
912 |
penv = (CPUState *)penv->next_cpu; |
913 |
} |
914 |
} |
915 |
} |
916 |
|
917 |
void resume_all_vcpus(void) |
918 |
{ |
919 |
CPUState *penv = first_cpu; |
920 |
|
921 |
while (penv) {
|
922 |
penv->stop = 0;
|
923 |
penv->stopped = 0;
|
924 |
qemu_cpu_kick(penv); |
925 |
penv = (CPUState *)penv->next_cpu; |
926 |
} |
927 |
} |
928 |
|
929 |
static void qemu_tcg_init_vcpu(void *_env) |
930 |
{ |
931 |
CPUState *env = _env; |
932 |
/* share a single thread for all cpus with TCG */
|
933 |
if (!tcg_cpu_thread) {
|
934 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
935 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
936 |
qemu_cond_init(env->halt_cond); |
937 |
qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env); |
938 |
while (env->created == 0) |
939 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
940 |
tcg_cpu_thread = env->thread; |
941 |
tcg_halt_cond = env->halt_cond; |
942 |
} else {
|
943 |
env->thread = tcg_cpu_thread; |
944 |
env->halt_cond = tcg_halt_cond; |
945 |
} |
946 |
} |
947 |
|
948 |
static void qemu_kvm_start_vcpu(CPUState *env) |
949 |
{ |
950 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
951 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
952 |
qemu_cond_init(env->halt_cond); |
953 |
qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env); |
954 |
while (env->created == 0) |
955 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
956 |
} |
957 |
|
958 |
void qemu_init_vcpu(void *_env) |
959 |
{ |
960 |
CPUState *env = _env; |
961 |
|
962 |
env->nr_cores = smp_cores; |
963 |
env->nr_threads = smp_threads; |
964 |
if (kvm_enabled())
|
965 |
qemu_kvm_start_vcpu(env); |
966 |
else
|
967 |
qemu_tcg_init_vcpu(env); |
968 |
} |
969 |
|
970 |
void qemu_notify_event(void) |
971 |
{ |
972 |
qemu_event_increment(); |
973 |
} |
974 |
|
975 |
static void qemu_system_vmstop_request(int reason) |
976 |
{ |
977 |
vmstop_requested = reason; |
978 |
qemu_notify_event(); |
979 |
} |
980 |
|
981 |
void cpu_stop_current(void) |
982 |
{ |
983 |
if (cpu_single_env) {
|
984 |
cpu_single_env->stopped = 1;
|
985 |
cpu_exit(cpu_single_env); |
986 |
} |
987 |
} |
988 |
|
989 |
void vm_stop(int reason) |
990 |
{ |
991 |
QemuThread me; |
992 |
qemu_thread_self(&me); |
993 |
|
994 |
if (!qemu_thread_equal(&me, &io_thread)) {
|
995 |
qemu_system_vmstop_request(reason); |
996 |
/*
|
997 |
* FIXME: should not return to device code in case
|
998 |
* vm_stop() has been requested.
|
999 |
*/
|
1000 |
cpu_stop_current(); |
1001 |
return;
|
1002 |
} |
1003 |
do_vm_stop(reason); |
1004 |
} |
1005 |
|
1006 |
#endif
|
1007 |
|
1008 |
static int qemu_cpu_exec(CPUState *env) |
1009 |
{ |
1010 |
int ret;
|
1011 |
#ifdef CONFIG_PROFILER
|
1012 |
int64_t ti; |
1013 |
#endif
|
1014 |
|
1015 |
#ifdef CONFIG_PROFILER
|
1016 |
ti = profile_getclock(); |
1017 |
#endif
|
1018 |
if (use_icount) {
|
1019 |
int64_t count; |
1020 |
int decr;
|
1021 |
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
1022 |
env->icount_decr.u16.low = 0;
|
1023 |
env->icount_extra = 0;
|
1024 |
count = qemu_icount_round (qemu_next_deadline()); |
1025 |
qemu_icount += count; |
1026 |
decr = (count > 0xffff) ? 0xffff : count; |
1027 |
count -= decr; |
1028 |
env->icount_decr.u16.low = decr; |
1029 |
env->icount_extra = count; |
1030 |
} |
1031 |
ret = cpu_exec(env); |
1032 |
#ifdef CONFIG_PROFILER
|
1033 |
qemu_time += profile_getclock() - ti; |
1034 |
#endif
|
1035 |
if (use_icount) {
|
1036 |
/* Fold pending instructions back into the
|
1037 |
instruction counter, and clear the interrupt flag. */
|
1038 |
qemu_icount -= (env->icount_decr.u16.low |
1039 |
+ env->icount_extra); |
1040 |
env->icount_decr.u32 = 0;
|
1041 |
env->icount_extra = 0;
|
1042 |
} |
1043 |
return ret;
|
1044 |
} |
1045 |
|
1046 |
bool cpu_exec_all(void) |
1047 |
{ |
1048 |
int r;
|
1049 |
|
1050 |
if (next_cpu == NULL) |
1051 |
next_cpu = first_cpu; |
1052 |
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
1053 |
CPUState *env = next_cpu; |
1054 |
|
1055 |
qemu_clock_enable(vm_clock, |
1056 |
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
1057 |
|
1058 |
if (qemu_alarm_pending())
|
1059 |
break;
|
1060 |
if (cpu_can_run(env)) {
|
1061 |
r = qemu_cpu_exec(env); |
1062 |
if (kvm_enabled()) {
|
1063 |
qemu_kvm_eat_signals(env); |
1064 |
} |
1065 |
if (r == EXCP_DEBUG) {
|
1066 |
break;
|
1067 |
} |
1068 |
} else if (env->stop) { |
1069 |
break;
|
1070 |
} |
1071 |
} |
1072 |
exit_request = 0;
|
1073 |
return any_cpu_has_work();
|
1074 |
} |
1075 |
|
1076 |
void set_numa_modes(void) |
1077 |
{ |
1078 |
CPUState *env; |
1079 |
int i;
|
1080 |
|
1081 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1082 |
for (i = 0; i < nb_numa_nodes; i++) { |
1083 |
if (node_cpumask[i] & (1 << env->cpu_index)) { |
1084 |
env->numa_node = i; |
1085 |
} |
1086 |
} |
1087 |
} |
1088 |
} |
1089 |
|
1090 |
void set_cpu_log(const char *optarg) |
1091 |
{ |
1092 |
int mask;
|
1093 |
const CPULogItem *item;
|
1094 |
|
1095 |
mask = cpu_str_to_log_mask(optarg); |
1096 |
if (!mask) {
|
1097 |
printf("Log items (comma separated):\n");
|
1098 |
for (item = cpu_log_items; item->mask != 0; item++) { |
1099 |
printf("%-10s %s\n", item->name, item->help);
|
1100 |
} |
1101 |
exit(1);
|
1102 |
} |
1103 |
cpu_set_log(mask); |
1104 |
} |
1105 |
|
1106 |
/* Return the virtual CPU time, based on the instruction counter. */
|
1107 |
int64_t cpu_get_icount(void)
|
1108 |
{ |
1109 |
int64_t icount; |
1110 |
CPUState *env = cpu_single_env;; |
1111 |
|
1112 |
icount = qemu_icount; |
1113 |
if (env) {
|
1114 |
if (!can_do_io(env)) {
|
1115 |
fprintf(stderr, "Bad clock read\n");
|
1116 |
} |
1117 |
icount -= (env->icount_decr.u16.low + env->icount_extra); |
1118 |
} |
1119 |
return qemu_icount_bias + (icount << icount_time_shift);
|
1120 |
} |
1121 |
|
1122 |
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
1123 |
{ |
1124 |
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
1125 |
#if defined(cpu_list_id)
|
1126 |
cpu_list_id(f, cpu_fprintf, optarg); |
1127 |
#elif defined(cpu_list)
|
1128 |
cpu_list(f, cpu_fprintf); /* deprecated */
|
1129 |
#endif
|
1130 |
} |