#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/config-file.h"
+#include "qemu/cutils.h"
#include "migration/vmstate.h"
#include "monitor/monitor.h"
#include "qapi/error.h"
#include "qemu/bitmap.h"
#include "qemu/seqlock.h"
#include "qemu/guest-random.h"
-#include "tcg.h"
+#include "tcg/tcg.h"
#include "hw/nmi.h"
#include "sysemu/replay.h"
#include "sysemu/runstate.h"
static TimersState timers_state;
bool mttcg_enabled;
-/*
- * We default to false if we know other options have been enabled
- * which are currently incompatible with MTTCG. Otherwise when each
- * guest (target) has been updated to support:
- * - atomic instructions
- * - memory ordering primitives (barriers)
- * they can set the appropriate CONFIG flags in ${target}-softmmu.mak
- *
- * Once a guest architecture has been converted to the new primitives
- * there are two remaining limitations to check.
- *
- * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host)
- * - The host must have a stronger memory order than the guest
- *
- * It may be possible in future to support strong guests on weak hosts
- * but that will require tagging all load/stores in a guest with their
- * implicit memory order requirements which would likely slow things
- * down a lot.
- */
-
-static bool check_tcg_memory_orders_compatible(void)
-{
-#if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO)
- return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0;
-#else
- return false;
-#endif
-}
-
-static bool default_mttcg_enabled(void)
-{
- if (use_icount || TCG_OVERSIZED_GUEST) {
- return false;
- } else {
-#ifdef TARGET_SUPPORTS_MTTCG
- return check_tcg_memory_orders_compatible();
-#else
- return false;
-#endif
- }
-}
-
-void qemu_tcg_configure(QemuOpts *opts, Error **errp)
-{
- const char *t = qemu_opt_get(opts, "thread");
- if (t) {
- if (strcmp(t, "multi") == 0) {
- if (TCG_OVERSIZED_GUEST) {
- error_setg(errp, "No MTTCG when guest word size > hosts");
- } else if (use_icount) {
- error_setg(errp, "No MTTCG when icount is enabled");
- } else {
-#ifndef TARGET_SUPPORTS_MTTCG
- warn_report("Guest not yet converted to MTTCG - "
- "you may get unexpected results");
-#endif
- if (!check_tcg_memory_orders_compatible()) {
- warn_report("Guest expects a stronger memory ordering "
- "than the host provides");
- error_printf("This may cause strange/hard to debug errors\n");
- }
- mttcg_enabled = true;
- }
- } else if (strcmp(t, "single") == 0) {
- mttcg_enabled = false;
- } else {
- error_setg(errp, "Invalid 'thread' setting %s", t);
- }
- } else {
- mttcg_enabled = default_mttcg_enabled();
- }
-}
/* The current number of executed instructions is based on what we
* originally budgeted minus the current state of the decrementing
void configure_icount(QemuOpts *opts, Error **errp)
{
- const char *option;
- char *rem_str = NULL;
+ const char *option = qemu_opt_get(opts, "shift");
+ bool sleep = qemu_opt_get_bool(opts, "sleep", true);
+ bool align = qemu_opt_get_bool(opts, "align", false);
+ long time_shift = -1;
- option = qemu_opt_get(opts, "shift");
- if (!option) {
- if (qemu_opt_get(opts, "align") != NULL) {
- error_setg(errp, "Please specify shift option when using align");
- }
+ if (!option && qemu_opt_get(opts, "align")) {
+ error_setg(errp, "Please specify shift option when using align");
return;
}
- icount_sleep = qemu_opt_get_bool(opts, "sleep", true);
- if (icount_sleep) {
- timers_state.icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
- icount_timer_cb, NULL);
- }
-
- icount_align_option = qemu_opt_get_bool(opts, "align", false);
-
- if (icount_align_option && !icount_sleep) {
+ if (align && !sleep) {
error_setg(errp, "align=on and sleep=off are incompatible");
+ return;
}
+
if (strcmp(option, "auto") != 0) {
- errno = 0;
- timers_state.icount_time_shift = strtol(option, &rem_str, 0);
- if (errno != 0 || *rem_str != '\0' || !strlen(option)) {
+ if (qemu_strtol(option, NULL, 0, &time_shift) < 0
+ || time_shift < 0 || time_shift > MAX_ICOUNT_SHIFT) {
error_setg(errp, "icount: Invalid shift value");
+ return;
}
- use_icount = 1;
- return;
} else if (icount_align_option) {
error_setg(errp, "shift=auto and align=on are incompatible");
+ return;
} else if (!icount_sleep) {
error_setg(errp, "shift=auto and sleep=off are incompatible");
+ return;
+ }
+
+ icount_sleep = sleep;
+ if (icount_sleep) {
+ timers_state.icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
+ icount_timer_cb, NULL);
+ }
+
+ icount_align_option = align;
+
+ if (time_shift >= 0) {
+ timers_state.icount_time_shift = time_shift;
+ use_icount = 1;
+ return;
}
use_icount = 2;
int ret = 0;
if (runstate_is_running()) {
+ runstate_set(state);
cpu_disable_ticks();
pause_all_vcpus();
- runstate_set(state);
vm_state_notify(0, state);
if (send_stop) {
qapi_event_send_stop();
*/
deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
QEMU_TIMER_ATTR_ALL);
+ /* Check realtime timers, because they help with input processing */
+ deadline = qemu_soonest_timeout(deadline,
+ qemu_clock_deadline_ns_all(QEMU_CLOCK_REALTIME,
+ QEMU_TIMER_ATTR_ALL));
/* Maintain prior (possibly buggy) behaviour where if no deadline
* was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
qemu_mutex_unlock(&qemu_global_mutex);
}
+void qemu_cond_wait_iothread(QemuCond *cond)
+{
+ qemu_cond_wait(cond, &qemu_global_mutex);
+}
+
static bool all_vcpus_paused(void)
{
CPUState *cpu;
{
CPUState *cpu;
+ if (!runstate_is_running()) {
+ return;
+ }
+
qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
CPU_FOREACH(cpu) {
cpu_resume(cpu);
projects / qemu.git / blobdiff