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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
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7
accel/tcg/tcg-all.c
View file

@ -29,6 +29,7 @@
#include "qom/object.h"
#include "cpu.h"
#include "sysemu/cpus.h"
#include "sysemu/cpu-timers.h"
#include "qemu/main-loop.h"
#include "tcg/tcg.h"
#include "qapi/error.h"
@ -66,7 +67,7 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask)
qemu_cpu_kick(cpu);
} else {
qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
if (use_icount &&
if (icount_enabled() &&
!cpu->can_do_io
&& (mask & ~old_mask) != 0) {
cpu_abort(cpu, "Raised interrupt while not in I/O function");
@ -105,7 +106,7 @@ static bool check_tcg_memory_orders_compatible(void)
static bool default_mttcg_enabled(void)
{
if (use_icount || TCG_OVERSIZED_GUEST) {
if (icount_enabled() || TCG_OVERSIZED_GUEST) {
return false;
} else {
#ifdef TARGET_SUPPORTS_MTTCG
@ -147,7 +148,7 @@ static void tcg_set_thread(Object *obj, const char *value, Error **errp)
if (strcmp(value, "multi") == 0) {
if (TCG_OVERSIZED_GUEST) {
error_setg(errp, "No MTTCG when guest word size > hosts");
} else if (use_icount) {
} else if (icount_enabled()) {
error_setg(errp, "No MTTCG when icount is enabled");
} else {
#ifndef TARGET_SUPPORTS_MTTCG