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cpu-timers, icount: new modules

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refactoring of cpus.c continues with cpu timer state extraction.

cpu-timers: responsible for the softmmu cpu timers state,
            including cpu clocks and ticks.

icount: counts the TCG instructions executed. As such it is specific to
the TCG accelerator. Therefore, it is built only under CONFIG_TCG.

One complication is due to qtest, which uses an icount field to warp time
as part of qtest (qtest_clock_warp).

In order to solve this problem, provide a separate counter for qtest.

This requires fixing assumptions scattered in the code that
qtest_enabled() implies icount_enabled(), checking each specific case.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[remove redundant initialization with qemu_spice_init]
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
[fix lingering calls to icount_get]
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Claudio Fontana 2020-08-19 13:17:19 +02:00 • committed by Paolo Bonzini
parent 0ac0b47c44
commit 740b175973
37 changed files with 1128 additions and 843 deletions
Download patch file Download diff file Expand all files Collapse all files

12
util/main-loop.c
View file

@ -27,7 +27,7 @@
#include "qemu/cutils.h"
#include "qemu/timer.h"
#include "sysemu/qtest.h"
#include "sysemu/cpus.h"
#include "sysemu/cpu-timers.h"
#include "sysemu/replay.h"
#include "qemu/main-loop.h"
#include "block/aio.h"
@ -521,9 +521,13 @@ void main_loop_wait(int nonblocking)
mlpoll.state = ret < 0 ? MAIN_LOOP_POLL_ERR : MAIN_LOOP_POLL_OK;
notifier_list_notify(&main_loop_poll_notifiers, &mlpoll);
/* CPU thread can infinitely wait for event after
missing the warp */
qemu_start_warp_timer();
if (icount_enabled()) {
/*
* CPU thread can infinitely wait for event after
* missing the warp
*/
qemu_start_warp_timer();
}
qemu_clock_run_all_timers();
}

10
util/qemu-timer.c
View file

@ -26,8 +26,10 @@
#include "qemu/main-loop.h"
#include "qemu/timer.h"
#include "qemu/lockable.h"
#include "sysemu/cpu-timers.h"
#include "sysemu/replay.h"
#include "sysemu/cpus.h"
#include "sysemu/qtest.h"
#ifdef CONFIG_POSIX
#include <pthread.h>
@ -134,7 +136,7 @@ static void qemu_clock_init(QEMUClockType type, QEMUTimerListNotifyCB *notify_cb
bool qemu_clock_use_for_deadline(QEMUClockType type)
{
return !(use_icount && (type == QEMU_CLOCK_VIRTUAL));
return !(icount_enabled() && (type == QEMU_CLOCK_VIRTUAL));
}
void qemu_clock_notify(QEMUClockType type)
@ -416,7 +418,7 @@ static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
static void timerlist_rearm(QEMUTimerList *timer_list)
{
/* Interrupt execution to force deadline recalculation. */
if (timer_list->clock->type == QEMU_CLOCK_VIRTUAL) {
if (icount_enabled() && timer_list->clock->type == QEMU_CLOCK_VIRTUAL) {
qemu_start_warp_timer();
}
timerlist_notify(timer_list);
@ -633,8 +635,10 @@ int64_t qemu_clock_get_ns(QEMUClockType type)
return get_clock();
default:
case QEMU_CLOCK_VIRTUAL:
if (use_icount) {
if (icount_enabled()) {
return cpu_get_icount();
} else if (qtest_enabled()) { /* for qtest_clock_warp */
return qtest_get_virtual_clock();
} else {
return cpu_get_clock();
}