820 lines
18 KiB
C
820 lines
18 KiB
C
/*
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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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#include "qemu/osdep.h"
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#include "monitor/monitor.h"
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#include "qemu/coroutine-tls.h"
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#include "qapi/error.h"
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#include "qapi/qapi-commands-machine.h"
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#include "qapi/qapi-commands-misc.h"
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#include "qapi/qapi-events-run-state.h"
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#include "qapi/qmp/qerror.h"
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#include "exec/gdbstub.h"
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#include "sysemu/hw_accel.h"
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#include "exec/cpu-common.h"
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#include "qemu/thread.h"
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#include "qemu/plugin.h"
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#include "sysemu/cpus.h"
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#include "qemu/guest-random.h"
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#include "hw/nmi.h"
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#include "sysemu/replay.h"
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#include "sysemu/runstate.h"
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#include "sysemu/cpu-timers.h"
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#include "sysemu/whpx.h"
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#include "hw/boards.h"
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#include "hw/hw.h"
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#include "trace.h"
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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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#ifndef PR_MCE_KILL_SET
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#define PR_MCE_KILL_SET 1
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#endif
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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 QemuMutex qemu_global_mutex;
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/*
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* The chosen accelerator is supposed to register this.
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*/
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static const AccelOpsClass *cpus_accel;
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bool cpu_is_stopped(CPUState *cpu)
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{
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return cpu->stopped || !runstate_is_running();
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}
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bool cpu_work_list_empty(CPUState *cpu)
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{
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return QSIMPLEQ_EMPTY_ATOMIC(&cpu->work_list);
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}
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bool cpu_thread_is_idle(CPUState *cpu)
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{
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if (cpu->stop || !cpu_work_list_empty(cpu)) {
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return false;
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}
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if (cpu_is_stopped(cpu)) {
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return true;
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}
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if (!cpu->halted || cpu_has_work(cpu)) {
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return false;
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}
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if (cpus_accel->cpu_thread_is_idle) {
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return cpus_accel->cpu_thread_is_idle(cpu);
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}
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return true;
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}
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bool all_cpu_threads_idle(void)
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{
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CPUState *cpu;
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CPU_FOREACH(cpu) {
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if (!cpu_thread_is_idle(cpu)) {
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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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void hw_error(const char *fmt, ...)
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{
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va_list ap;
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CPUState *cpu;
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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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CPU_FOREACH(cpu) {
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fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
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cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
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}
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va_end(ap);
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abort();
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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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CPU_FOREACH(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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CPU_FOREACH(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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CPU_FOREACH(cpu) {
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cpu_synchronize_post_init(cpu);
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}
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}
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void cpu_synchronize_all_pre_loadvm(void)
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{
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CPUState *cpu;
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CPU_FOREACH(cpu) {
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cpu_synchronize_pre_loadvm(cpu);
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}
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}
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void cpu_synchronize_state(CPUState *cpu)
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{
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if (cpus_accel->synchronize_state) {
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cpus_accel->synchronize_state(cpu);
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}
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}
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void cpu_synchronize_post_reset(CPUState *cpu)
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{
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if (cpus_accel->synchronize_post_reset) {
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cpus_accel->synchronize_post_reset(cpu);
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}
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}
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void cpu_synchronize_post_init(CPUState *cpu)
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{
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if (cpus_accel->synchronize_post_init) {
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cpus_accel->synchronize_post_init(cpu);
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}
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}
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void cpu_synchronize_pre_loadvm(CPUState *cpu)
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{
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if (cpus_accel->synchronize_pre_loadvm) {
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cpus_accel->synchronize_pre_loadvm(cpu);
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}
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}
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bool cpus_are_resettable(void)
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{
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if (cpus_accel->cpus_are_resettable) {
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return cpus_accel->cpus_are_resettable();
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}
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return true;
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}
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int64_t cpus_get_virtual_clock(void)
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{
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/*
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* XXX
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*
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* need to check that cpus_accel is not NULL, because qcow2 calls
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* qemu_get_clock_ns(CLOCK_VIRTUAL) without any accel initialized and
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* with ticks disabled in some io-tests:
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* 030 040 041 060 099 120 127 140 156 161 172 181 191 192 195 203 229 249 256 267
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*
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* is this expected?
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*
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* XXX
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*/
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if (cpus_accel && cpus_accel->get_virtual_clock) {
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return cpus_accel->get_virtual_clock();
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}
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return cpu_get_clock();
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}
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/*
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* return the time elapsed in VM between vm_start and vm_stop. Unless
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* icount is active, cpus_get_elapsed_ticks() uses units of the host CPU cycle
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* counter.
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*/
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int64_t cpus_get_elapsed_ticks(void)
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{
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if (cpus_accel->get_elapsed_ticks) {
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return cpus_accel->get_elapsed_ticks();
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}
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return cpu_get_ticks();
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}
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static void generic_handle_interrupt(CPUState *cpu, int mask)
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{
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cpu->interrupt_request |= mask;
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if (!qemu_cpu_is_self(cpu)) {
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qemu_cpu_kick(cpu);
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}
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}
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void cpu_interrupt(CPUState *cpu, int mask)
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{
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if (cpus_accel->handle_interrupt) {
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cpus_accel->handle_interrupt(cpu, mask);
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} else {
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generic_handle_interrupt(cpu, mask);
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}
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}
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static int do_vm_stop(RunState state, bool send_stop)
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{
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int ret = 0;
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if (runstate_is_running()) {
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runstate_set(state);
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cpu_disable_ticks();
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pause_all_vcpus();
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vm_state_notify(0, state);
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if (send_stop) {
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qapi_event_send_stop();
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}
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}
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bdrv_drain_all();
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ret = bdrv_flush_all();
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trace_vm_stop_flush_all(ret);
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return ret;
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}
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/* Special vm_stop() variant for terminating the process. Historically clients
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* did not expect a QMP STOP event and so we need to retain compatibility.
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*/
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int vm_shutdown(void)
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{
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return do_vm_stop(RUN_STATE_SHUTDOWN, false);
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}
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bool cpu_can_run(CPUState *cpu)
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{
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if (cpu->stop) {
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return false;
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}
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if (cpu_is_stopped(cpu)) {
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return false;
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}
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return true;
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}
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void cpu_handle_guest_debug(CPUState *cpu)
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{
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if (replay_running_debug()) {
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if (!cpu->singlestep_enabled) {
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/*
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* Report about the breakpoint and
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* make a single step to skip it
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*/
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replay_breakpoint();
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cpu_single_step(cpu, SSTEP_ENABLE);
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} else {
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cpu_single_step(cpu, 0);
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}
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} else {
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gdb_set_stop_cpu(cpu);
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qemu_system_debug_request();
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cpu->stopped = true;
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}
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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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pthread_sigmask(SIG_UNBLOCK, &set, NULL);
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}
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perror("Failed to re-raise SIGBUS!");
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abort();
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}
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static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
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{
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if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
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sigbus_reraise();
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}
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if (current_cpu) {
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/* Called asynchronously in VCPU thread. */
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if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) {
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sigbus_reraise();
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}
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} else {
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/* Called synchronously (via signalfd) in main thread. */
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if (kvm_on_sigbus(siginfo->si_code, siginfo->si_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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* ALERT: when modifying this, take care that SIGBUS forwarding in
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* os_mem_prealloc() will continue working as expected.
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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 = 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);
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}
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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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static QemuThread io_thread;
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/* cpu creation */
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static QemuCond qemu_cpu_cond;
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/* system init */
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static QemuCond qemu_pause_cond;
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void qemu_init_cpu_loop(void)
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{
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qemu_init_sigbus();
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qemu_cond_init(&qemu_cpu_cond);
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qemu_cond_init(&qemu_pause_cond);
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qemu_mutex_init(&qemu_global_mutex);
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qemu_thread_get_self(&io_thread);
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}
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void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data)
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{
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do_run_on_cpu(cpu, func, data, &qemu_global_mutex);
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}
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static void qemu_cpu_stop(CPUState *cpu, bool exit)
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{
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g_assert(qemu_cpu_is_self(cpu));
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cpu->stop = false;
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cpu->stopped = true;
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if (exit) {
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cpu_exit(cpu);
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}
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qemu_cond_broadcast(&qemu_pause_cond);
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}
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void qemu_wait_io_event_common(CPUState *cpu)
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{
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qatomic_mb_set(&cpu->thread_kicked, false);
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if (cpu->stop) {
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qemu_cpu_stop(cpu, false);
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}
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process_queued_cpu_work(cpu);
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}
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void qemu_wait_io_event(CPUState *cpu)
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{
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bool slept = false;
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while (cpu_thread_is_idle(cpu)) {
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if (!slept) {
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slept = true;
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qemu_plugin_vcpu_idle_cb(cpu);
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}
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qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
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}
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if (slept) {
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qemu_plugin_vcpu_resume_cb(cpu);
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}
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#ifdef _WIN32
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/* Eat dummy APC queued by cpus_kick_thread. */
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if (hax_enabled()) {
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SleepEx(0, TRUE);
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}
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#endif
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qemu_wait_io_event_common(cpu);
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}
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void cpus_kick_thread(CPUState *cpu)
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{
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#ifndef _WIN32
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int err;
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if (cpu->thread_kicked) {
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return;
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}
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cpu->thread_kicked = true;
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err = pthread_kill(cpu->thread->thread, SIG_IPI);
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if (err && err != ESRCH) {
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fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
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exit(1);
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}
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#endif
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}
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void qemu_cpu_kick(CPUState *cpu)
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{
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qemu_cond_broadcast(cpu->halt_cond);
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if (cpus_accel->kick_vcpu_thread) {
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cpus_accel->kick_vcpu_thread(cpu);
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} else { /* default */
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cpus_kick_thread(cpu);
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}
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}
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void qemu_cpu_kick_self(void)
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{
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assert(current_cpu);
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cpus_kick_thread(current_cpu);
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}
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bool qemu_cpu_is_self(CPUState *cpu)
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{
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return qemu_thread_is_self(cpu->thread);
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}
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bool qemu_in_vcpu_thread(void)
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{
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return current_cpu && qemu_cpu_is_self(current_cpu);
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}
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QEMU_DEFINE_STATIC_CO_TLS(bool, iothread_locked)
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bool qemu_mutex_iothread_locked(void)
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{
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return get_iothread_locked();
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}
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bool qemu_in_main_thread(void)
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{
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return qemu_mutex_iothread_locked();
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}
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/*
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* The BQL is taken from so many places that it is worth profiling the
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* callers directly, instead of funneling them all through a single function.
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*/
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void qemu_mutex_lock_iothread_impl(const char *file, int line)
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{
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QemuMutexLockFunc bql_lock = qatomic_read(&qemu_bql_mutex_lock_func);
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g_assert(!qemu_mutex_iothread_locked());
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bql_lock(&qemu_global_mutex, file, line);
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set_iothread_locked(true);
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}
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void qemu_mutex_unlock_iothread(void)
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{
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g_assert(qemu_mutex_iothread_locked());
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set_iothread_locked(false);
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qemu_mutex_unlock(&qemu_global_mutex);
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}
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void qemu_cond_wait_iothread(QemuCond *cond)
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{
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qemu_cond_wait(cond, &qemu_global_mutex);
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}
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void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
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{
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qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
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}
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/* signal CPU creation */
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void cpu_thread_signal_created(CPUState *cpu)
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{
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cpu->created = true;
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qemu_cond_signal(&qemu_cpu_cond);
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}
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/* signal CPU destruction */
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void cpu_thread_signal_destroyed(CPUState *cpu)
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{
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cpu->created = false;
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qemu_cond_signal(&qemu_cpu_cond);
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}
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static bool all_vcpus_paused(void)
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{
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CPUState *cpu;
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CPU_FOREACH(cpu) {
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if (!cpu->stopped) {
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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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void pause_all_vcpus(void)
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{
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CPUState *cpu;
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qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
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CPU_FOREACH(cpu) {
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if (qemu_cpu_is_self(cpu)) {
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qemu_cpu_stop(cpu, true);
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} else {
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|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|