# By Chegu Vinod # Via Juan Quintela * quintela/migration.next: Force auto-convegence of live migration Add 'auto-converge' migration capability Introduce async_run_on_cpu() Message-id: 1373664508-5404-1-git-send-email-quintela@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
1373 lines
34 KiB
C
1373 lines
34 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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/* Needed early for CONFIG_BSD etc. */
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#include "config-host.h"
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#include "monitor/monitor.h"
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#include "sysemu/sysemu.h"
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#include "exec/gdbstub.h"
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#include "sysemu/dma.h"
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#include "sysemu/kvm.h"
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#include "qmp-commands.h"
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#include "qemu/thread.h"
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#include "sysemu/cpus.h"
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#include "sysemu/qtest.h"
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#include "qemu/main-loop.h"
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#include "qemu/bitmap.h"
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#ifndef _WIN32
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#include "qemu/compatfd.h"
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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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#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 CPUState *next_cpu;
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static bool cpu_thread_is_idle(CPUState *cpu)
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{
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if (cpu->stop || cpu->queued_work_first) {
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return false;
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}
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if (cpu->stopped || !runstate_is_running()) {
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return true;
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}
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if (!cpu->halted || qemu_cpu_has_work(cpu) ||
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kvm_halt_in_kernel()) {
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return false;
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}
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return true;
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}
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static bool all_cpu_threads_idle(void)
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{
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CPUState *cpu;
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for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_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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/* guest cycle counter */
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/* Conversion factor from emulated instructions to virtual clock ticks. */
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static int icount_time_shift;
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/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
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#define MAX_ICOUNT_SHIFT 10
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/* Compensate for varying guest execution speed. */
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static int64_t qemu_icount_bias;
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static QEMUTimer *icount_rt_timer;
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static QEMUTimer *icount_vm_timer;
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static QEMUTimer *icount_warp_timer;
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static int64_t vm_clock_warp_start;
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static int64_t qemu_icount;
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typedef struct TimersState {
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int64_t cpu_ticks_prev;
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int64_t cpu_ticks_offset;
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int64_t cpu_clock_offset;
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int32_t cpu_ticks_enabled;
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int64_t dummy;
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} TimersState;
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TimersState timers_state;
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/* Return the virtual CPU time, based on the instruction counter. */
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int64_t cpu_get_icount(void)
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{
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int64_t icount;
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CPUState *cpu = current_cpu;
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icount = qemu_icount;
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if (cpu) {
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CPUArchState *env = cpu->env_ptr;
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if (!can_do_io(env)) {
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fprintf(stderr, "Bad clock read\n");
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}
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icount -= (env->icount_decr.u16.low + env->icount_extra);
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}
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return qemu_icount_bias + (icount << icount_time_shift);
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}
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/* return the host CPU cycle counter and handle stop/restart */
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int64_t cpu_get_ticks(void)
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{
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if (use_icount) {
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return cpu_get_icount();
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}
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_ticks_offset;
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} else {
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int64_t ticks;
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ticks = cpu_get_real_ticks();
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if (timers_state.cpu_ticks_prev > ticks) {
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/* Note: non increasing ticks may happen if the host uses
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software suspend */
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timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks;
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}
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timers_state.cpu_ticks_prev = ticks;
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return ticks + timers_state.cpu_ticks_offset;
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}
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}
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/* return the host CPU monotonic timer and handle stop/restart */
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int64_t cpu_get_clock(void)
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{
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int64_t ti;
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_clock_offset;
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} else {
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ti = get_clock();
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return ti + timers_state.cpu_clock_offset;
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}
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}
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/* enable cpu_get_ticks() */
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void cpu_enable_ticks(void)
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{
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if (!timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset -= cpu_get_real_ticks();
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timers_state.cpu_clock_offset -= get_clock();
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timers_state.cpu_ticks_enabled = 1;
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}
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}
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/* disable cpu_get_ticks() : the clock is stopped. You must not call
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cpu_get_ticks() after that. */
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void cpu_disable_ticks(void)
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{
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if (timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset = cpu_get_ticks();
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timers_state.cpu_clock_offset = cpu_get_clock();
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timers_state.cpu_ticks_enabled = 0;
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}
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}
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/* Correlation between real and virtual time is always going to be
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fairly approximate, so ignore small variation.
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When the guest is idle real and virtual time will be aligned in
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the IO wait loop. */
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#define ICOUNT_WOBBLE (get_ticks_per_sec() / 10)
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static void icount_adjust(void)
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{
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int64_t cur_time;
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int64_t cur_icount;
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int64_t delta;
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static int64_t last_delta;
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/* If the VM is not running, then do nothing. */
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if (!runstate_is_running()) {
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return;
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}
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cur_time = cpu_get_clock();
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cur_icount = qemu_get_clock_ns(vm_clock);
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delta = cur_icount - cur_time;
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/* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
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if (delta > 0
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&& last_delta + ICOUNT_WOBBLE < delta * 2
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&& icount_time_shift > 0) {
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/* The guest is getting too far ahead. Slow time down. */
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icount_time_shift--;
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}
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if (delta < 0
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&& last_delta - ICOUNT_WOBBLE > delta * 2
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&& icount_time_shift < MAX_ICOUNT_SHIFT) {
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/* The guest is getting too far behind. Speed time up. */
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icount_time_shift++;
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}
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last_delta = delta;
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qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
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}
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static void icount_adjust_rt(void *opaque)
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{
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qemu_mod_timer(icount_rt_timer,
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qemu_get_clock_ms(rt_clock) + 1000);
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icount_adjust();
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}
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static void icount_adjust_vm(void *opaque)
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{
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qemu_mod_timer(icount_vm_timer,
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qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
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icount_adjust();
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}
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static int64_t qemu_icount_round(int64_t count)
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{
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return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
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}
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static void icount_warp_rt(void *opaque)
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{
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if (vm_clock_warp_start == -1) {
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return;
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}
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if (runstate_is_running()) {
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int64_t clock = qemu_get_clock_ns(rt_clock);
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int64_t warp_delta = clock - vm_clock_warp_start;
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if (use_icount == 1) {
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qemu_icount_bias += warp_delta;
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} else {
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/*
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* In adaptive mode, do not let the vm_clock run too
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* far ahead of real time.
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*/
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int64_t cur_time = cpu_get_clock();
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int64_t cur_icount = qemu_get_clock_ns(vm_clock);
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int64_t delta = cur_time - cur_icount;
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qemu_icount_bias += MIN(warp_delta, delta);
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}
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if (qemu_clock_expired(vm_clock)) {
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qemu_notify_event();
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}
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}
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vm_clock_warp_start = -1;
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}
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void qtest_clock_warp(int64_t dest)
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{
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int64_t clock = qemu_get_clock_ns(vm_clock);
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assert(qtest_enabled());
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while (clock < dest) {
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int64_t deadline = qemu_clock_deadline(vm_clock);
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int64_t warp = MIN(dest - clock, deadline);
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qemu_icount_bias += warp;
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qemu_run_timers(vm_clock);
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clock = qemu_get_clock_ns(vm_clock);
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}
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qemu_notify_event();
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}
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void qemu_clock_warp(QEMUClock *clock)
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{
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int64_t deadline;
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/*
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* There are too many global variables to make the "warp" behavior
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* applicable to other clocks. But a clock argument removes the
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* need for if statements all over the place.
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*/
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if (clock != vm_clock || !use_icount) {
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return;
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}
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/*
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* If the CPUs have been sleeping, advance the vm_clock timer now. This
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* ensures that the deadline for the timer is computed correctly below.
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* This also makes sure that the insn counter is synchronized before the
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* CPU starts running, in case the CPU is woken by an event other than
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* the earliest vm_clock timer.
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*/
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icount_warp_rt(NULL);
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if (!all_cpu_threads_idle() || !qemu_clock_has_timers(vm_clock)) {
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qemu_del_timer(icount_warp_timer);
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return;
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}
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if (qtest_enabled()) {
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/* When testing, qtest commands advance icount. */
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return;
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}
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vm_clock_warp_start = qemu_get_clock_ns(rt_clock);
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deadline = qemu_clock_deadline(vm_clock);
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if (deadline > 0) {
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/*
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* Ensure the vm_clock proceeds even when the virtual CPU goes to
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* sleep. Otherwise, the CPU might be waiting for a future timer
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* interrupt to wake it up, but the interrupt never comes because
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* the vCPU isn't running any insns and thus doesn't advance the
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* vm_clock.
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*
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* An extreme solution for this problem would be to never let VCPUs
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* sleep in icount mode if there is a pending vm_clock timer; rather
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* time could just advance to the next vm_clock event. Instead, we
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* do stop VCPUs and only advance vm_clock after some "real" time,
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* (related to the time left until the next event) has passed. This
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* rt_clock timer will do this. This avoids that the warps are too
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* visible externally---for example, you will not be sending network
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* packets continuously instead of every 100ms.
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*/
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qemu_mod_timer(icount_warp_timer, vm_clock_warp_start + deadline);
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} else {
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qemu_notify_event();
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}
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}
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static const VMStateDescription vmstate_timers = {
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.name = "timer",
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.version_id = 2,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_INT64(cpu_ticks_offset, TimersState),
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VMSTATE_INT64(dummy, TimersState),
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VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
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VMSTATE_END_OF_LIST()
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}
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};
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void configure_icount(const char *option)
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{
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vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
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if (!option) {
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return;
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}
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icount_warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL);
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if (strcmp(option, "auto") != 0) {
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icount_time_shift = strtol(option, NULL, 0);
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use_icount = 1;
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return;
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}
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use_icount = 2;
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/* 125MIPS seems a reasonable initial guess at the guest speed.
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It will be corrected fairly quickly anyway. */
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icount_time_shift = 3;
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/* Have both realtime and virtual time triggers for speed adjustment.
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The realtime trigger catches emulated time passing too slowly,
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the virtual time trigger catches emulated time passing too fast.
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Realtime triggers occur even when idle, so use them less frequently
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than VM triggers. */
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icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
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qemu_mod_timer(icount_rt_timer,
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qemu_get_clock_ms(rt_clock) + 1000);
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icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
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qemu_mod_timer(icount_vm_timer,
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qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
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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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for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
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fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
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cpu_dump_state(cpu, stderr, fprintf, 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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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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bool cpu_is_stopped(CPUState *cpu)
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{
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return !runstate_is_running() || cpu->stopped;
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}
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static int do_vm_stop(RunState state)
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{
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int ret = 0;
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if (runstate_is_running()) {
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cpu_disable_ticks();
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pause_all_vcpus();
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runstate_set(state);
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vm_state_notify(0, state);
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bdrv_drain_all();
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ret = bdrv_flush_all();
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monitor_protocol_event(QEVENT_STOP, NULL);
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}
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return ret;
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}
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static 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->stopped || !runstate_is_running()) {
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return false;
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}
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return true;
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}
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static void cpu_handle_guest_debug(CPUState *cpu)
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{
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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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static void cpu_signal(int sig)
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{
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if (current_cpu) {
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cpu_exit(current_cpu);
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}
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exit_request = 1;
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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();
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}
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static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
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void *ctx)
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{
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if (kvm_on_sigbus(siginfo->ssi_code,
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(void *)(intptr_t)siginfo->ssi_addr)) {
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sigbus_reraise();
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}
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}
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|
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static void qemu_init_sigbus(void)
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{
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_flags = SA_SIGINFO;
|
|
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
|
|
sigaction(SIGBUS, &action, NULL);
|
|
|
|
prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
|
|
}
|
|
|
|
static void qemu_kvm_eat_signals(CPUState *cpu)
|
|
{
|
|
struct timespec ts = { 0, 0 };
|
|
siginfo_t siginfo;
|
|
sigset_t waitset;
|
|
sigset_t chkset;
|
|
int r;
|
|
|
|
sigemptyset(&waitset);
|
|
sigaddset(&waitset, SIG_IPI);
|
|
sigaddset(&waitset, SIGBUS);
|
|
|
|
do {
|
|
r = sigtimedwait(&waitset, &siginfo, &ts);
|
|
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
|
|
perror("sigtimedwait");
|
|
exit(1);
|
|
}
|
|
|
|
switch (r) {
|
|
case SIGBUS:
|
|
if (kvm_on_sigbus_vcpu(cpu, siginfo.si_code, siginfo.si_addr)) {
|
|
sigbus_reraise();
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
r = sigpending(&chkset);
|
|
if (r == -1) {
|
|
perror("sigpending");
|
|
exit(1);
|
|
}
|
|
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
|
|
}
|
|
|
|
#else /* !CONFIG_LINUX */
|
|
|
|
static void qemu_init_sigbus(void)
|
|
{
|
|
}
|
|
|
|
static void qemu_kvm_eat_signals(CPUState *cpu)
|
|
{
|
|
}
|
|
#endif /* !CONFIG_LINUX */
|
|
|
|
#ifndef _WIN32
|
|
static void dummy_signal(int sig)
|
|
{
|
|
}
|
|
|
|
static void qemu_kvm_init_cpu_signals(CPUState *cpu)
|
|
{
|
|
int r;
|
|
sigset_t set;
|
|
struct sigaction sigact;
|
|
|
|
memset(&sigact, 0, sizeof(sigact));
|
|
sigact.sa_handler = dummy_signal;
|
|
sigaction(SIG_IPI, &sigact, NULL);
|
|
|
|
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
|
sigdelset(&set, SIG_IPI);
|
|
sigdelset(&set, SIGBUS);
|
|
r = kvm_set_signal_mask(cpu, &set);
|
|
if (r) {
|
|
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void qemu_tcg_init_cpu_signals(void)
|
|
{
|
|
sigset_t set;
|
|
struct sigaction sigact;
|
|
|
|
memset(&sigact, 0, sizeof(sigact));
|
|
sigact.sa_handler = cpu_signal;
|
|
sigaction(SIG_IPI, &sigact, NULL);
|
|
|
|
sigemptyset(&set);
|
|
sigaddset(&set, SIG_IPI);
|
|
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
|
}
|
|
|
|
#else /* _WIN32 */
|
|
static void qemu_kvm_init_cpu_signals(CPUState *cpu)
|
|
{
|
|
abort();
|
|
}
|
|
|
|
static void qemu_tcg_init_cpu_signals(void)
|
|
{
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
static QemuMutex qemu_global_mutex;
|
|
static QemuCond qemu_io_proceeded_cond;
|
|
static bool iothread_requesting_mutex;
|
|
|
|
static QemuThread io_thread;
|
|
|
|
static QemuThread *tcg_cpu_thread;
|
|
static QemuCond *tcg_halt_cond;
|
|
|
|
/* cpu creation */
|
|
static QemuCond qemu_cpu_cond;
|
|
/* system init */
|
|
static QemuCond qemu_pause_cond;
|
|
static QemuCond qemu_work_cond;
|
|
|
|
void qemu_init_cpu_loop(void)
|
|
{
|
|
qemu_init_sigbus();
|
|
qemu_cond_init(&qemu_cpu_cond);
|
|
qemu_cond_init(&qemu_pause_cond);
|
|
qemu_cond_init(&qemu_work_cond);
|
|
qemu_cond_init(&qemu_io_proceeded_cond);
|
|
qemu_mutex_init(&qemu_global_mutex);
|
|
|
|
qemu_thread_get_self(&io_thread);
|
|
}
|
|
|
|
void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
|
|
{
|
|
struct qemu_work_item wi;
|
|
|
|
if (qemu_cpu_is_self(cpu)) {
|
|
func(data);
|
|
return;
|
|
}
|
|
|
|
wi.func = func;
|
|
wi.data = data;
|
|
wi.free = false;
|
|
if (cpu->queued_work_first == NULL) {
|
|
cpu->queued_work_first = &wi;
|
|
} else {
|
|
cpu->queued_work_last->next = &wi;
|
|
}
|
|
cpu->queued_work_last = &wi;
|
|
wi.next = NULL;
|
|
wi.done = false;
|
|
|
|
qemu_cpu_kick(cpu);
|
|
while (!wi.done) {
|
|
CPUState *self_cpu = current_cpu;
|
|
|
|
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
|
|
current_cpu = self_cpu;
|
|
}
|
|
}
|
|
|
|
void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
|
|
{
|
|
struct qemu_work_item *wi;
|
|
|
|
if (qemu_cpu_is_self(cpu)) {
|
|
func(data);
|
|
return;
|
|
}
|
|
|
|
wi = g_malloc0(sizeof(struct qemu_work_item));
|
|
wi->func = func;
|
|
wi->data = data;
|
|
wi->free = true;
|
|
if (cpu->queued_work_first == NULL) {
|
|
cpu->queued_work_first = wi;
|
|
} else {
|
|
cpu->queued_work_last->next = wi;
|
|
}
|
|
cpu->queued_work_last = wi;
|
|
wi->next = NULL;
|
|
wi->done = false;
|
|
|
|
qemu_cpu_kick(cpu);
|
|
}
|
|
|
|
static void flush_queued_work(CPUState *cpu)
|
|
{
|
|
struct qemu_work_item *wi;
|
|
|
|
if (cpu->queued_work_first == NULL) {
|
|
return;
|
|
}
|
|
|
|
while ((wi = cpu->queued_work_first)) {
|
|
cpu->queued_work_first = wi->next;
|
|
wi->func(wi->data);
|
|
wi->done = true;
|
|
if (wi->free) {
|
|
g_free(wi);
|
|
}
|
|
}
|
|
cpu->queued_work_last = NULL;
|
|
qemu_cond_broadcast(&qemu_work_cond);
|
|
}
|
|
|
|
static void qemu_wait_io_event_common(CPUState *cpu)
|
|
{
|
|
if (cpu->stop) {
|
|
cpu->stop = false;
|
|
cpu->stopped = true;
|
|
qemu_cond_signal(&qemu_pause_cond);
|
|
}
|
|
flush_queued_work(cpu);
|
|
cpu->thread_kicked = false;
|
|
}
|
|
|
|
static void qemu_tcg_wait_io_event(void)
|
|
{
|
|
CPUState *cpu;
|
|
|
|
while (all_cpu_threads_idle()) {
|
|
/* Start accounting real time to the virtual clock if the CPUs
|
|
are idle. */
|
|
qemu_clock_warp(vm_clock);
|
|
qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
|
|
}
|
|
|
|
while (iothread_requesting_mutex) {
|
|
qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex);
|
|
}
|
|
|
|
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
|
|
qemu_wait_io_event_common(cpu);
|
|
}
|
|
}
|
|
|
|
static void qemu_kvm_wait_io_event(CPUState *cpu)
|
|
{
|
|
while (cpu_thread_is_idle(cpu)) {
|
|
qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
|
|
}
|
|
|
|
qemu_kvm_eat_signals(cpu);
|
|
qemu_wait_io_event_common(cpu);
|
|
}
|
|
|
|
static void *qemu_kvm_cpu_thread_fn(void *arg)
|
|
{
|
|
CPUState *cpu = arg;
|
|
int r;
|
|
|
|
qemu_mutex_lock(&qemu_global_mutex);
|
|
qemu_thread_get_self(cpu->thread);
|
|
cpu->thread_id = qemu_get_thread_id();
|
|
current_cpu = cpu;
|
|
|
|
r = kvm_init_vcpu(cpu);
|
|
if (r < 0) {
|
|
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
|
exit(1);
|
|
}
|
|
|
|
qemu_kvm_init_cpu_signals(cpu);
|
|
|
|
/* signal CPU creation */
|
|
cpu->created = true;
|
|
qemu_cond_signal(&qemu_cpu_cond);
|
|
|
|
while (1) {
|
|
if (cpu_can_run(cpu)) {
|
|
r = kvm_cpu_exec(cpu);
|
|
if (r == EXCP_DEBUG) {
|
|
cpu_handle_guest_debug(cpu);
|
|
}
|
|
}
|
|
qemu_kvm_wait_io_event(cpu);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void *qemu_dummy_cpu_thread_fn(void *arg)
|
|
{
|
|
#ifdef _WIN32
|
|
fprintf(stderr, "qtest is not supported under Windows\n");
|
|
exit(1);
|
|
#else
|
|
CPUState *cpu = arg;
|
|
sigset_t waitset;
|
|
int r;
|
|
|
|
qemu_mutex_lock_iothread();
|
|
qemu_thread_get_self(cpu->thread);
|
|
cpu->thread_id = qemu_get_thread_id();
|
|
|
|
sigemptyset(&waitset);
|
|
sigaddset(&waitset, SIG_IPI);
|
|
|
|
/* signal CPU creation */
|
|
cpu->created = true;
|
|
qemu_cond_signal(&qemu_cpu_cond);
|
|
|
|
current_cpu = cpu;
|
|
while (1) {
|
|
current_cpu = NULL;
|
|
qemu_mutex_unlock_iothread();
|
|
do {
|
|
int sig;
|
|
r = sigwait(&waitset, &sig);
|
|
} while (r == -1 && (errno == EAGAIN || errno == EINTR));
|
|
if (r == -1) {
|
|
perror("sigwait");
|
|
exit(1);
|
|
}
|
|
qemu_mutex_lock_iothread();
|
|
current_cpu = cpu;
|
|
qemu_wait_io_event_common(cpu);
|
|
}
|
|
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
static void tcg_exec_all(void);
|
|
|
|
static void tcg_signal_cpu_creation(CPUState *cpu, void *data)
|
|
{
|
|
cpu->thread_id = qemu_get_thread_id();
|
|
cpu->created = true;
|
|
}
|
|
|
|
static void *qemu_tcg_cpu_thread_fn(void *arg)
|
|
{
|
|
CPUState *cpu = arg;
|
|
|
|
qemu_tcg_init_cpu_signals();
|
|
qemu_thread_get_self(cpu->thread);
|
|
|
|
qemu_mutex_lock(&qemu_global_mutex);
|
|
qemu_for_each_cpu(tcg_signal_cpu_creation, NULL);
|
|
qemu_cond_signal(&qemu_cpu_cond);
|
|
|
|
/* wait for initial kick-off after machine start */
|
|
while (first_cpu->stopped) {
|
|
qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
|
|
|
|
/* process any pending work */
|
|
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
|
|
qemu_wait_io_event_common(cpu);
|
|
}
|
|
}
|
|
|
|
while (1) {
|
|
tcg_exec_all();
|
|
if (use_icount && qemu_clock_deadline(vm_clock) <= 0) {
|
|
qemu_notify_event();
|
|
}
|
|
qemu_tcg_wait_io_event();
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void qemu_cpu_kick_thread(CPUState *cpu)
|
|
{
|
|
#ifndef _WIN32
|
|
int err;
|
|
|
|
err = pthread_kill(cpu->thread->thread, SIG_IPI);
|
|
if (err) {
|
|
fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
|
|
exit(1);
|
|
}
|
|
#else /* _WIN32 */
|
|
if (!qemu_cpu_is_self(cpu)) {
|
|
CONTEXT tcgContext;
|
|
|
|
if (SuspendThread(cpu->hThread) == (DWORD)-1) {
|
|
fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
|
|
GetLastError());
|
|
exit(1);
|
|
}
|
|
|
|
/* On multi-core systems, we are not sure that the thread is actually
|
|
* suspended until we can get the context.
|
|
*/
|
|
tcgContext.ContextFlags = CONTEXT_CONTROL;
|
|
while (GetThreadContext(cpu->hThread, &tcgContext) != 0) {
|
|
continue;
|
|
}
|
|
|
|
cpu_signal(0);
|
|
|
|
if (ResumeThread(cpu->hThread) == (DWORD)-1) {
|
|
fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
|
|
GetLastError());
|
|
exit(1);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void qemu_cpu_kick(CPUState *cpu)
|
|
{
|
|
qemu_cond_broadcast(cpu->halt_cond);
|
|
if (!tcg_enabled() && !cpu->thread_kicked) {
|
|
qemu_cpu_kick_thread(cpu);
|
|
cpu->thread_kicked = true;
|
|
}
|
|
}
|
|
|
|
void qemu_cpu_kick_self(void)
|
|
{
|
|
#ifndef _WIN32
|
|
assert(current_cpu);
|
|
|
|
if (!current_cpu->thread_kicked) {
|
|
qemu_cpu_kick_thread(current_cpu);
|
|
current_cpu->thread_kicked = true;
|
|
}
|
|
#else
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
bool qemu_cpu_is_self(CPUState *cpu)
|
|
{
|
|
return qemu_thread_is_self(cpu->thread);
|
|
}
|
|
|
|
static bool qemu_in_vcpu_thread(void)
|
|
{
|
|
return current_cpu && qemu_cpu_is_self(current_cpu);
|
|
}
|
|
|
|
void qemu_mutex_lock_iothread(void)
|
|
{
|
|
if (!tcg_enabled()) {
|
|
qemu_mutex_lock(&qemu_global_mutex);
|
|
} else {
|
|
iothread_requesting_mutex = true;
|
|
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
|
qemu_cpu_kick_thread(first_cpu);
|
|
qemu_mutex_lock(&qemu_global_mutex);
|
|
}
|
|
iothread_requesting_mutex = false;
|
|
qemu_cond_broadcast(&qemu_io_proceeded_cond);
|
|
}
|
|
}
|
|
|
|
void qemu_mutex_unlock_iothread(void)
|
|
{
|
|
qemu_mutex_unlock(&qemu_global_mutex);
|
|
}
|
|
|
|
static int all_vcpus_paused(void)
|
|
{
|
|
CPUState *cpu = first_cpu;
|
|
|
|
while (cpu) {
|
|
if (!cpu->stopped) {
|
|
return 0;
|
|
}
|
|
cpu = cpu->next_cpu;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
void pause_all_vcpus(void)
|
|
{
|
|
CPUState *cpu = first_cpu;
|
|
|
|
qemu_clock_enable(vm_clock, false);
|
|
while (cpu) {
|
|
cpu->stop = true;
|
|
qemu_cpu_kick(cpu);
|
|
cpu = cpu->next_cpu;
|
|
}
|
|
|
|
if (qemu_in_vcpu_thread()) {
|
|
cpu_stop_current();
|
|
if (!kvm_enabled()) {
|
|
cpu = first_cpu;
|
|
while (cpu) {
|
|
cpu->stop = false;
|
|
cpu->stopped = true;
|
|
cpu = cpu->next_cpu;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
while (!all_vcpus_paused()) {
|
|
qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
|
|
cpu = first_cpu;
|
|
while (cpu) {
|
|
qemu_cpu_kick(cpu);
|
|
cpu = cpu->next_cpu;
|
|
}
|
|
}
|
|
}
|
|
|
|
void cpu_resume(CPUState *cpu)
|
|
{
|
|
cpu->stop = false;
|
|
cpu->stopped = false;
|
|
qemu_cpu_kick(cpu);
|
|
}
|
|
|
|
void resume_all_vcpus(void)
|
|
{
|
|
CPUState *cpu = first_cpu;
|
|
|
|
qemu_clock_enable(vm_clock, true);
|
|
while (cpu) {
|
|
cpu_resume(cpu);
|
|
cpu = cpu->next_cpu;
|
|
}
|
|
}
|
|
|
|
static void qemu_tcg_init_vcpu(CPUState *cpu)
|
|
{
|
|
/* share a single thread for all cpus with TCG */
|
|
if (!tcg_cpu_thread) {
|
|
cpu->thread = g_malloc0(sizeof(QemuThread));
|
|
cpu->halt_cond = g_malloc0(sizeof(QemuCond));
|
|
qemu_cond_init(cpu->halt_cond);
|
|
tcg_halt_cond = cpu->halt_cond;
|
|
qemu_thread_create(cpu->thread, qemu_tcg_cpu_thread_fn, cpu,
|
|
QEMU_THREAD_JOINABLE);
|
|
#ifdef _WIN32
|
|
cpu->hThread = qemu_thread_get_handle(cpu->thread);
|
|
#endif
|
|
while (!cpu->created) {
|
|
qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
|
|
}
|
|
tcg_cpu_thread = cpu->thread;
|
|
} else {
|
|
cpu->thread = tcg_cpu_thread;
|
|
cpu->halt_cond = tcg_halt_cond;
|
|
}
|
|
}
|
|
|
|
static void qemu_kvm_start_vcpu(CPUState *cpu)
|
|
{
|
|
cpu->thread = g_malloc0(sizeof(QemuThread));
|
|
cpu->halt_cond = g_malloc0(sizeof(QemuCond));
|
|
qemu_cond_init(cpu->halt_cond);
|
|
qemu_thread_create(cpu->thread, qemu_kvm_cpu_thread_fn, cpu,
|
|
QEMU_THREAD_JOINABLE);
|
|
while (!cpu->created) {
|
|
qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
|
|
}
|
|
}
|
|
|
|
static void qemu_dummy_start_vcpu(CPUState *cpu)
|
|
{
|
|
cpu->thread = g_malloc0(sizeof(QemuThread));
|
|
cpu->halt_cond = g_malloc0(sizeof(QemuCond));
|
|
qemu_cond_init(cpu->halt_cond);
|
|
qemu_thread_create(cpu->thread, qemu_dummy_cpu_thread_fn, cpu,
|
|
QEMU_THREAD_JOINABLE);
|
|
while (!cpu->created) {
|
|
qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
|
|
}
|
|
}
|
|
|
|
void qemu_init_vcpu(CPUState *cpu)
|
|
{
|
|
cpu->nr_cores = smp_cores;
|
|
cpu->nr_threads = smp_threads;
|
|
cpu->stopped = true;
|
|
if (kvm_enabled()) {
|
|
qemu_kvm_start_vcpu(cpu);
|
|
} else if (tcg_enabled()) {
|
|
qemu_tcg_init_vcpu(cpu);
|
|
} else {
|
|
qemu_dummy_start_vcpu(cpu);
|
|
}
|
|
}
|
|
|
|
void cpu_stop_current(void)
|
|
{
|
|
if (current_cpu) {
|
|
current_cpu->stop = false;
|
|
current_cpu->stopped = true;
|
|
cpu_exit(current_cpu);
|
|
qemu_cond_signal(&qemu_pause_cond);
|
|
}
|
|
}
|
|
|
|
int vm_stop(RunState state)
|
|
{
|
|
if (qemu_in_vcpu_thread()) {
|
|
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);
|
|
}
|
|
|
|
/* 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 {
|
|
runstate_set(state);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int tcg_cpu_exec(CPUArchState *env)
|
|
{
|
|
int ret;
|
|
#ifdef CONFIG_PROFILER
|
|
int64_t ti;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PROFILER
|
|
ti = profile_getclock();
|
|
#endif
|
|
if (use_icount) {
|
|
int64_t count;
|
|
int decr;
|
|
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
|
|
env->icount_decr.u16.low = 0;
|
|
env->icount_extra = 0;
|
|
count = qemu_icount_round(qemu_clock_deadline(vm_clock));
|
|
qemu_icount += count;
|
|
decr = (count > 0xffff) ? 0xffff : count;
|
|
count -= decr;
|
|
env->icount_decr.u16.low = decr;
|
|
env->icount_extra = count;
|
|
}
|
|
ret = cpu_exec(env);
|
|
#ifdef CONFIG_PROFILER
|
|
qemu_time += profile_getclock() - ti;
|
|
#endif
|
|
if (use_icount) {
|
|
/* Fold pending instructions back into the
|
|
instruction counter, and clear the interrupt flag. */
|
|
qemu_icount -= (env->icount_decr.u16.low
|
|
+ env->icount_extra);
|
|
env->icount_decr.u32 = 0;
|
|
env->icount_extra = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void tcg_exec_all(void)
|
|
{
|
|
int r;
|
|
|
|
/* Account partial waits to the vm_clock. */
|
|
qemu_clock_warp(vm_clock);
|
|
|
|
if (next_cpu == NULL) {
|
|
next_cpu = first_cpu;
|
|
}
|
|
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
|
|
CPUState *cpu = next_cpu;
|
|
CPUArchState *env = cpu->env_ptr;
|
|
|
|
qemu_clock_enable(vm_clock,
|
|
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
|
|
|
if (cpu_can_run(cpu)) {
|
|
r = tcg_cpu_exec(env);
|
|
if (r == EXCP_DEBUG) {
|
|
cpu_handle_guest_debug(cpu);
|
|
break;
|
|
}
|
|
} else if (cpu->stop || cpu->stopped) {
|
|
break;
|
|
}
|
|
}
|
|
exit_request = 0;
|
|
}
|
|
|
|
void set_numa_modes(void)
|
|
{
|
|
CPUState *cpu;
|
|
int i;
|
|
|
|
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
|
|
for (i = 0; i < nb_numa_nodes; i++) {
|
|
if (test_bit(cpu->cpu_index, node_cpumask[i])) {
|
|
cpu->numa_node = i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
|
|
{
|
|
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
|
#if defined(cpu_list)
|
|
cpu_list(f, cpu_fprintf);
|
|
#endif
|
|
}
|
|
|
|
CpuInfoList *qmp_query_cpus(Error **errp)
|
|
{
|
|
CpuInfoList *head = NULL, *cur_item = NULL;
|
|
CPUState *cpu;
|
|
|
|
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
|
|
CpuInfoList *info;
|
|
#if defined(TARGET_I386)
|
|
X86CPU *x86_cpu = X86_CPU(cpu);
|
|
CPUX86State *env = &x86_cpu->env;
|
|
#elif defined(TARGET_PPC)
|
|
PowerPCCPU *ppc_cpu = POWERPC_CPU(cpu);
|
|
CPUPPCState *env = &ppc_cpu->env;
|
|
#elif defined(TARGET_SPARC)
|
|
SPARCCPU *sparc_cpu = SPARC_CPU(cpu);
|
|
CPUSPARCState *env = &sparc_cpu->env;
|
|
#elif defined(TARGET_MIPS)
|
|
MIPSCPU *mips_cpu = MIPS_CPU(cpu);
|
|
CPUMIPSState *env = &mips_cpu->env;
|
|
#endif
|
|
|
|
cpu_synchronize_state(cpu);
|
|
|
|
info = g_malloc0(sizeof(*info));
|
|
info->value = g_malloc0(sizeof(*info->value));
|
|
info->value->CPU = cpu->cpu_index;
|
|
info->value->current = (cpu == first_cpu);
|
|
info->value->halted = cpu->halted;
|
|
info->value->thread_id = cpu->thread_id;
|
|
#if defined(TARGET_I386)
|
|
info->value->has_pc = true;
|
|
info->value->pc = env->eip + env->segs[R_CS].base;
|
|
#elif defined(TARGET_PPC)
|
|
info->value->has_nip = true;
|
|
info->value->nip = env->nip;
|
|
#elif defined(TARGET_SPARC)
|
|
info->value->has_pc = true;
|
|
info->value->pc = env->pc;
|
|
info->value->has_npc = true;
|
|
info->value->npc = env->npc;
|
|
#elif defined(TARGET_MIPS)
|
|
info->value->has_PC = true;
|
|
info->value->PC = env->active_tc.PC;
|
|
#endif
|
|
|
|
/* XXX: waiting for the qapi to support GSList */
|
|
if (!cur_item) {
|
|
head = cur_item = info;
|
|
} else {
|
|
cur_item->next = info;
|
|
cur_item = info;
|
|
}
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
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;
|
|
CPUArchState *env;
|
|
CPUState *cpu;
|
|
uint8_t buf[1024];
|
|
|
|
if (!has_cpu) {
|
|
cpu_index = 0;
|
|
}
|
|
|
|
cpu = qemu_get_cpu(cpu_index);
|
|
if (cpu == NULL) {
|
|
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
|
|
"a CPU number");
|
|
return;
|
|
}
|
|
env = cpu->env_ptr;
|
|
|
|
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_memory_rw_debug(env, addr, buf, l, 0);
|
|
if (fwrite(buf, 1, l, f) != l) {
|
|
error_set(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_rw(addr, buf, l, 0);
|
|
if (fwrite(buf, 1, l, f) != l) {
|
|
error_set(errp, QERR_IO_ERROR);
|
|
goto exit;
|
|
}
|
|
addr += l;
|
|
size -= l;
|
|
}
|
|
|
|
exit:
|
|
fclose(f);
|
|
}
|
|
|
|
void qmp_inject_nmi(Error **errp)
|
|
{
|
|
#if defined(TARGET_I386)
|
|
CPUState *cs;
|
|
|
|
for (cs = first_cpu; cs != NULL; cs = cs->next_cpu) {
|
|
X86CPU *cpu = X86_CPU(cs);
|
|
CPUX86State *env = &cpu->env;
|
|
|
|
if (!env->apic_state) {
|
|
cpu_interrupt(cs, CPU_INTERRUPT_NMI);
|
|
} else {
|
|
apic_deliver_nmi(env->apic_state);
|
|
}
|
|
}
|
|
#else
|
|
error_set(errp, QERR_UNSUPPORTED);
|
|
#endif
|
|
}
|