+++ /dev/null
-/*
- * QEMU System Emulator
- *
- * Copyright (c) 2003-2008 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "qemu/osdep.h"
-#include "monitor/monitor.h"
-#include "qemu/coroutine-tls.h"
-#include "qapi/error.h"
-#include "qapi/qapi-commands-machine.h"
-#include "qapi/qapi-commands-misc.h"
-#include "qapi/qapi-events-run-state.h"
-#include "qapi/qmp/qerror.h"
-#include "exec/gdbstub.h"
-#include "sysemu/hw_accel.h"
-#include "exec/cpu-common.h"
-#include "qemu/thread.h"
-#include "qemu/main-loop.h"
-#include "qemu/plugin.h"
-#include "sysemu/cpus.h"
-#include "qemu/guest-random.h"
-#include "hw/nmi.h"
-#include "sysemu/replay.h"
-#include "sysemu/runstate.h"
-#include "sysemu/cpu-timers.h"
-#include "sysemu/whpx.h"
-#include "hw/boards.h"
-#include "hw/hw.h"
-#include "trace.h"
-
-#ifdef CONFIG_LINUX
-
-#include <sys/prctl.h>
-
-#ifndef PR_MCE_KILL
-#define PR_MCE_KILL 33
-#endif
-
-#ifndef PR_MCE_KILL_SET
-#define PR_MCE_KILL_SET 1
-#endif
-
-#ifndef PR_MCE_KILL_EARLY
-#define PR_MCE_KILL_EARLY 1
-#endif
-
-#endif /* CONFIG_LINUX */
-
-static QemuMutex qemu_global_mutex;
-
-/*
- * The chosen accelerator is supposed to register this.
- */
-static const AccelOpsClass *cpus_accel;
-
-bool cpu_is_stopped(CPUState *cpu)
-{
- return cpu->stopped || !runstate_is_running();
-}
-
-bool cpu_work_list_empty(CPUState *cpu)
-{
- return QSIMPLEQ_EMPTY_ATOMIC(&cpu->work_list);
-}
-
-bool cpu_thread_is_idle(CPUState *cpu)
-{
- if (cpu->stop || !cpu_work_list_empty(cpu)) {
- return false;
- }
- if (cpu_is_stopped(cpu)) {
- return true;
- }
- if (!cpu->halted || cpu_has_work(cpu)) {
- return false;
- }
- if (cpus_accel->cpu_thread_is_idle) {
- return cpus_accel->cpu_thread_is_idle(cpu);
- }
- return true;
-}
-
-bool all_cpu_threads_idle(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- if (!cpu_thread_is_idle(cpu)) {
- return false;
- }
- }
- return true;
-}
-
-/***********************************************************/
-void hw_error(const char *fmt, ...)
-{
- va_list ap;
- CPUState *cpu;
-
- va_start(ap, fmt);
- fprintf(stderr, "qemu: hardware error: ");
- vfprintf(stderr, fmt, ap);
- fprintf(stderr, "\n");
- CPU_FOREACH(cpu) {
- fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
- cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
- }
- va_end(ap);
- abort();
-}
-
-void cpu_synchronize_all_states(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- cpu_synchronize_state(cpu);
- }
-}
-
-void cpu_synchronize_all_post_reset(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- cpu_synchronize_post_reset(cpu);
- }
-}
-
-void cpu_synchronize_all_post_init(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- cpu_synchronize_post_init(cpu);
- }
-}
-
-void cpu_synchronize_all_pre_loadvm(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- cpu_synchronize_pre_loadvm(cpu);
- }
-}
-
-void cpu_synchronize_state(CPUState *cpu)
-{
- if (cpus_accel->synchronize_state) {
- cpus_accel->synchronize_state(cpu);
- }
-}
-
-void cpu_synchronize_post_reset(CPUState *cpu)
-{
- if (cpus_accel->synchronize_post_reset) {
- cpus_accel->synchronize_post_reset(cpu);
- }
-}
-
-void cpu_synchronize_post_init(CPUState *cpu)
-{
- if (cpus_accel->synchronize_post_init) {
- cpus_accel->synchronize_post_init(cpu);
- }
-}
-
-void cpu_synchronize_pre_loadvm(CPUState *cpu)
-{
- if (cpus_accel->synchronize_pre_loadvm) {
- cpus_accel->synchronize_pre_loadvm(cpu);
- }
-}
-
-bool cpus_are_resettable(void)
-{
- if (cpus_accel->cpus_are_resettable) {
- return cpus_accel->cpus_are_resettable();
- }
- return true;
-}
-
-int64_t cpus_get_virtual_clock(void)
-{
- /*
- * XXX
- *
- * need to check that cpus_accel is not NULL, because qcow2 calls
- * qemu_get_clock_ns(CLOCK_VIRTUAL) without any accel initialized and
- * with ticks disabled in some io-tests:
- * 030 040 041 060 099 120 127 140 156 161 172 181 191 192 195 203 229 249 256 267
- *
- * is this expected?
- *
- * XXX
- */
- if (cpus_accel && cpus_accel->get_virtual_clock) {
- return cpus_accel->get_virtual_clock();
- }
- return cpu_get_clock();
-}
-
-/*
- * return the time elapsed in VM between vm_start and vm_stop. Unless
- * icount is active, cpus_get_elapsed_ticks() uses units of the host CPU cycle
- * counter.
- */
-int64_t cpus_get_elapsed_ticks(void)
-{
- if (cpus_accel->get_elapsed_ticks) {
- return cpus_accel->get_elapsed_ticks();
- }
- return cpu_get_ticks();
-}
-
-static void generic_handle_interrupt(CPUState *cpu, int mask)
-{
- cpu->interrupt_request |= mask;
-
- if (!qemu_cpu_is_self(cpu)) {
- qemu_cpu_kick(cpu);
- }
-}
-
-void cpu_interrupt(CPUState *cpu, int mask)
-{
- if (cpus_accel->handle_interrupt) {
- cpus_accel->handle_interrupt(cpu, mask);
- } else {
- generic_handle_interrupt(cpu, mask);
- }
-}
-
-static int do_vm_stop(RunState state, bool send_stop)
-{
- int ret = 0;
-
- if (runstate_is_running()) {
- runstate_set(state);
- cpu_disable_ticks();
- pause_all_vcpus();
- vm_state_notify(0, state);
- if (send_stop) {
- qapi_event_send_stop();
- }
- }
-
- bdrv_drain_all();
- ret = bdrv_flush_all();
- trace_vm_stop_flush_all(ret);
-
- return ret;
-}
-
-/* Special vm_stop() variant for terminating the process. Historically clients
- * did not expect a QMP STOP event and so we need to retain compatibility.
- */
-int vm_shutdown(void)
-{
- return do_vm_stop(RUN_STATE_SHUTDOWN, false);
-}
-
-bool cpu_can_run(CPUState *cpu)
-{
- if (cpu->stop) {
- return false;
- }
- if (cpu_is_stopped(cpu)) {
- return false;
- }
- return true;
-}
-
-void cpu_handle_guest_debug(CPUState *cpu)
-{
- if (replay_running_debug()) {
- if (!cpu->singlestep_enabled) {
- /*
- * Report about the breakpoint and
- * make a single step to skip it
- */
- replay_breakpoint();
- cpu_single_step(cpu, SSTEP_ENABLE);
- } else {
- cpu_single_step(cpu, 0);
- }
- } else {
- gdb_set_stop_cpu(cpu);
- qemu_system_debug_request();
- cpu->stopped = true;
- }
-}
-
-#ifdef CONFIG_LINUX
-static void sigbus_reraise(void)
-{
- sigset_t set;
- struct sigaction action;
-
- memset(&action, 0, sizeof(action));
- action.sa_handler = SIG_DFL;
- if (!sigaction(SIGBUS, &action, NULL)) {
- raise(SIGBUS);
- sigemptyset(&set);
- sigaddset(&set, SIGBUS);
- pthread_sigmask(SIG_UNBLOCK, &set, NULL);
- }
- perror("Failed to re-raise SIGBUS!");
- abort();
-}
-
-static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
-{
- if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
- sigbus_reraise();
- }
-
- if (current_cpu) {
- /* Called asynchronously in VCPU thread. */
- if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) {
- sigbus_reraise();
- }
- } else {
- /* Called synchronously (via signalfd) in main thread. */
- if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
- sigbus_reraise();
- }
- }
-}
-
-static void qemu_init_sigbus(void)
-{
- struct sigaction action;
-
- /*
- * ALERT: when modifying this, take care that SIGBUS forwarding in
- * qemu_prealloc_mem() will continue working as expected.
- */
- memset(&action, 0, sizeof(action));
- action.sa_flags = SA_SIGINFO;
- action.sa_sigaction = sigbus_handler;
- sigaction(SIGBUS, &action, NULL);
-
- prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
-}
-#else /* !CONFIG_LINUX */
-static void qemu_init_sigbus(void)
-{
-}
-#endif /* !CONFIG_LINUX */
-
-static QemuThread io_thread;
-
-/* cpu creation */
-static QemuCond qemu_cpu_cond;
-/* system init */
-static QemuCond qemu_pause_cond;
-
-void qemu_init_cpu_loop(void)
-{
- qemu_init_sigbus();
- qemu_cond_init(&qemu_cpu_cond);
- qemu_cond_init(&qemu_pause_cond);
- qemu_mutex_init(&qemu_global_mutex);
-
- qemu_thread_get_self(&io_thread);
-}
-
-void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data)
-{
- do_run_on_cpu(cpu, func, data, &qemu_global_mutex);
-}
-
-static void qemu_cpu_stop(CPUState *cpu, bool exit)
-{
- g_assert(qemu_cpu_is_self(cpu));
- cpu->stop = false;
- cpu->stopped = true;
- if (exit) {
- cpu_exit(cpu);
- }
- qemu_cond_broadcast(&qemu_pause_cond);
-}
-
-void qemu_wait_io_event_common(CPUState *cpu)
-{
- qatomic_set_mb(&cpu->thread_kicked, false);
- if (cpu->stop) {
- qemu_cpu_stop(cpu, false);
- }
- process_queued_cpu_work(cpu);
-}
-
-void qemu_wait_io_event(CPUState *cpu)
-{
- bool slept = false;
-
- while (cpu_thread_is_idle(cpu)) {
- if (!slept) {
- slept = true;
- qemu_plugin_vcpu_idle_cb(cpu);
- }
- qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
- }
- if (slept) {
- qemu_plugin_vcpu_resume_cb(cpu);
- }
-
- qemu_wait_io_event_common(cpu);
-}
-
-void cpus_kick_thread(CPUState *cpu)
-{
- if (cpu->thread_kicked) {
- return;
- }
- cpu->thread_kicked = true;
-
-#ifndef _WIN32
- int err = pthread_kill(cpu->thread->thread, SIG_IPI);
- if (err && err != ESRCH) {
- fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
- exit(1);
- }
-#else
- qemu_sem_post(&cpu->sem);
-#endif
-}
-
-void qemu_cpu_kick(CPUState *cpu)
-{
- qemu_cond_broadcast(cpu->halt_cond);
- if (cpus_accel->kick_vcpu_thread) {
- cpus_accel->kick_vcpu_thread(cpu);
- } else { /* default */
- cpus_kick_thread(cpu);
- }
-}
-
-void qemu_cpu_kick_self(void)
-{
- assert(current_cpu);
- cpus_kick_thread(current_cpu);
-}
-
-bool qemu_cpu_is_self(CPUState *cpu)
-{
- return qemu_thread_is_self(cpu->thread);
-}
-
-bool qemu_in_vcpu_thread(void)
-{
- return current_cpu && qemu_cpu_is_self(current_cpu);
-}
-
-QEMU_DEFINE_STATIC_CO_TLS(bool, iothread_locked)
-
-bool qemu_mutex_iothread_locked(void)
-{
- return get_iothread_locked();
-}
-
-bool qemu_in_main_thread(void)
-{
- return qemu_mutex_iothread_locked();
-}
-
-/*
- * The BQL is taken from so many places that it is worth profiling the
- * callers directly, instead of funneling them all through a single function.
- */
-void qemu_mutex_lock_iothread_impl(const char *file, int line)
-{
- QemuMutexLockFunc bql_lock = qatomic_read(&qemu_bql_mutex_lock_func);
-
- g_assert(!qemu_mutex_iothread_locked());
- bql_lock(&qemu_global_mutex, file, line);
- set_iothread_locked(true);
-}
-
-void qemu_mutex_unlock_iothread(void)
-{
- g_assert(qemu_mutex_iothread_locked());
- set_iothread_locked(false);
- qemu_mutex_unlock(&qemu_global_mutex);
-}
-
-void qemu_cond_wait_iothread(QemuCond *cond)
-{
- qemu_cond_wait(cond, &qemu_global_mutex);
-}
-
-void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
-{
- qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
-}
-
-/* signal CPU creation */
-void cpu_thread_signal_created(CPUState *cpu)
-{
- cpu->created = true;
- qemu_cond_signal(&qemu_cpu_cond);
-}
-
-/* signal CPU destruction */
-void cpu_thread_signal_destroyed(CPUState *cpu)
-{
- cpu->created = false;
- qemu_cond_signal(&qemu_cpu_cond);
-}
-
-
-static bool all_vcpus_paused(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- if (!cpu->stopped) {
- return false;
- }
- }
-
- return true;
-}
-
-void pause_all_vcpus(void)
-{
- CPUState *cpu;
-
- qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
- CPU_FOREACH(cpu) {
- if (qemu_cpu_is_self(cpu)) {
- qemu_cpu_stop(cpu, true);
- } else {
- cpu->stop = true;
- qemu_cpu_kick(cpu);
- }
- }
-
- /* We need to drop the replay_lock so any vCPU threads woken up
- * can finish their replay tasks
- */
- replay_mutex_unlock();
-
- while (!all_vcpus_paused()) {
- qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
- CPU_FOREACH(cpu) {
- qemu_cpu_kick(cpu);
- }
- }
-
- qemu_mutex_unlock_iothread();
- replay_mutex_lock();
- qemu_mutex_lock_iothread();
-}
-
-void cpu_resume(CPUState *cpu)
-{
- cpu->stop = false;
- cpu->stopped = false;
- qemu_cpu_kick(cpu);
-}
-
-void resume_all_vcpus(void)
-{
- CPUState *cpu;
-
- if (!runstate_is_running()) {
- return;
- }
-
- qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
- CPU_FOREACH(cpu) {
- cpu_resume(cpu);
- }
-}
-
-void cpu_remove_sync(CPUState *cpu)
-{
- cpu->stop = true;
- cpu->unplug = true;
- qemu_cpu_kick(cpu);
- qemu_mutex_unlock_iothread();
- qemu_thread_join(cpu->thread);
- qemu_mutex_lock_iothread();
-}
-
-void cpus_register_accel(const AccelOpsClass *ops)
-{
- assert(ops != NULL);
- assert(ops->create_vcpu_thread != NULL); /* mandatory */
- cpus_accel = ops;
-}
-
-const AccelOpsClass *cpus_get_accel(void)
-{
- /* broken if we call this early */
- assert(cpus_accel);
- return cpus_accel;
-}
-
-void qemu_init_vcpu(CPUState *cpu)
-{
- MachineState *ms = MACHINE(qdev_get_machine());
-
- cpu->nr_cores = ms->smp.cores;
- cpu->nr_threads = ms->smp.threads;
- cpu->stopped = true;
- cpu->random_seed = qemu_guest_random_seed_thread_part1();
-
- if (!cpu->as) {
- /* If the target cpu hasn't set up any address spaces itself,
- * give it the default one.
- */
- cpu->num_ases = 1;
- cpu_address_space_init(cpu, 0, "cpu-memory", cpu->memory);
- }
-
- /* accelerators all implement the AccelOpsClass */
- g_assert(cpus_accel != NULL && cpus_accel->create_vcpu_thread != NULL);
- cpus_accel->create_vcpu_thread(cpu);
-
- while (!cpu->created) {
- qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
- }
-}
-
-void cpu_stop_current(void)
-{
- if (current_cpu) {
- current_cpu->stop = true;
- cpu_exit(current_cpu);
- }
-}
-
-int vm_stop(RunState state)
-{
- if (qemu_in_vcpu_thread()) {
- qemu_system_vmstop_request_prepare();
- qemu_system_vmstop_request(state);
- /*
- * FIXME: should not return to device code in case
- * vm_stop() has been requested.
- */
- cpu_stop_current();
- return 0;
- }
-
- return do_vm_stop(state, true);
-}
-
-/**
- * Prepare for (re)starting the VM.
- * Returns -1 if the vCPUs are not to be restarted (e.g. if they are already
- * running or in case of an error condition), 0 otherwise.
- */
-int vm_prepare_start(bool step_pending)
-{
- RunState requested;
-
- qemu_vmstop_requested(&requested);
- if (runstate_is_running() && requested == RUN_STATE__MAX) {
- return -1;
- }
-
- /* Ensure that a STOP/RESUME pair of events is emitted if a
- * vmstop request was pending. The BLOCK_IO_ERROR event, for
- * example, according to documentation is always followed by
- * the STOP event.
- */
- if (runstate_is_running()) {
- qapi_event_send_stop();
- qapi_event_send_resume();
- return -1;
- }
-
- /*
- * WHPX accelerator needs to know whether we are going to step
- * any CPUs, before starting the first one.
- */
- if (cpus_accel->synchronize_pre_resume) {
- cpus_accel->synchronize_pre_resume(step_pending);
- }
-
- /* We are sending this now, but the CPUs will be resumed shortly later */
- qapi_event_send_resume();
-
- cpu_enable_ticks();
- runstate_set(RUN_STATE_RUNNING);
- vm_state_notify(1, RUN_STATE_RUNNING);
- return 0;
-}
-
-void vm_start(void)
-{
- if (!vm_prepare_start(false)) {
- resume_all_vcpus();
- }
-}
-
-/* does a state transition even if the VM is already stopped,
- current state is forgotten forever */
-int vm_stop_force_state(RunState state)
-{
- if (runstate_is_running()) {
- return vm_stop(state);
- } else {
- int ret;
- runstate_set(state);
-
- bdrv_drain_all();
- /* Make sure to return an error if the flush in a previous vm_stop()
- * failed. */
- ret = bdrv_flush_all();
- trace_vm_stop_flush_all(ret);
- return ret;
- }
-}
-
-void qmp_memsave(int64_t addr, int64_t size, const char *filename,
- bool has_cpu, int64_t cpu_index, Error **errp)
-{
- FILE *f;
- uint32_t l;
- CPUState *cpu;
- uint8_t buf[1024];
- int64_t orig_addr = addr, orig_size = size;
-
- if (!has_cpu) {
- cpu_index = 0;
- }
-
- cpu = qemu_get_cpu(cpu_index);
- if (cpu == NULL) {
- error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
- "a CPU number");
- return;
- }
-
- f = fopen(filename, "wb");
- if (!f) {
- error_setg_file_open(errp, errno, filename);
- return;
- }
-
- while (size != 0) {
- l = sizeof(buf);
- if (l > size)
- l = size;
- if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) {
- error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64
- " specified", orig_addr, orig_size);
- goto exit;
- }
- if (fwrite(buf, 1, l, f) != l) {
- error_setg(errp, QERR_IO_ERROR);
- goto exit;
- }
- addr += l;
- size -= l;
- }
-
-exit:
- fclose(f);
-}
-
-void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
- Error **errp)
-{
- FILE *f;
- uint32_t l;
- uint8_t buf[1024];
-
- f = fopen(filename, "wb");
- if (!f) {
- error_setg_file_open(errp, errno, filename);
- return;
- }
-
- while (size != 0) {
- l = sizeof(buf);
- if (l > size)
- l = size;
- cpu_physical_memory_read(addr, buf, l);
- if (fwrite(buf, 1, l, f) != l) {
- error_setg(errp, QERR_IO_ERROR);
- goto exit;
- }
- addr += l;
- size -= l;
- }
-
-exit:
- fclose(f);
-}
-
-void qmp_inject_nmi(Error **errp)
-{
- nmi_monitor_handle(monitor_get_cpu_index(monitor_cur()), errp);
-}
-
projects / thirdparty / qemu.git / blobdiff