qemu/accel/tcg/tcg-all.c
Richard Henderson d7ec12f83c tcg: Split out tcg init functions to tcg/startup.h
The tcg/tcg.h header is a big bucket, containing stuff related to
the translators and the JIT backend.  The places that initialize
tcg or create new threads do not need all of that, so split out
these three functions to a new header.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-04 11:03:54 -07:00

272 lines
7.8 KiB
C

/*
* QEMU System Emulator, accelerator interfaces
*
* Copyright (c) 2003-2008 Fabrice Bellard
* Copyright (c) 2014 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "sysemu/tcg.h"
#include "exec/replay-core.h"
#include "sysemu/cpu-timers.h"
#include "tcg/startup.h"
#include "tcg/oversized-guest.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/accel.h"
#include "qemu/atomic.h"
#include "qapi/qapi-builtin-visit.h"
#include "qemu/units.h"
#if !defined(CONFIG_USER_ONLY)
#include "hw/boards.h"
#endif
#include "internal-target.h"
struct TCGState {
AccelState parent_obj;
bool mttcg_enabled;
bool one_insn_per_tb;
int splitwx_enabled;
unsigned long tb_size;
};
typedef struct TCGState TCGState;
#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
DECLARE_INSTANCE_CHECKER(TCGState, TCG_STATE,
TYPE_TCG_ACCEL)
/*
* 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 is one remaining limitation to check:
* - The guest can't be oversized (e.g. 64 bit guest on 32 bit host)
*/
static bool default_mttcg_enabled(void)
{
if (icount_enabled() || TCG_OVERSIZED_GUEST) {
return false;
}
#ifdef TARGET_SUPPORTS_MTTCG
# ifndef TCG_GUEST_DEFAULT_MO
# error "TARGET_SUPPORTS_MTTCG without TCG_GUEST_DEFAULT_MO"
# endif
return true;
#else
return false;
#endif
}
static void tcg_accel_instance_init(Object *obj)
{
TCGState *s = TCG_STATE(obj);
s->mttcg_enabled = default_mttcg_enabled();
/* If debugging enabled, default "auto on", otherwise off. */
#if defined(CONFIG_DEBUG_TCG) && !defined(CONFIG_USER_ONLY)
s->splitwx_enabled = -1;
#else
s->splitwx_enabled = 0;
#endif
}
bool mttcg_enabled;
bool one_insn_per_tb;
static int tcg_init_machine(MachineState *ms)
{
TCGState *s = TCG_STATE(current_accel());
#ifdef CONFIG_USER_ONLY
unsigned max_cpus = 1;
#else
unsigned max_cpus = ms->smp.max_cpus;
#endif
tcg_allowed = true;
mttcg_enabled = s->mttcg_enabled;
page_init();
tb_htable_init();
tcg_init(s->tb_size * MiB, s->splitwx_enabled, max_cpus);
#if defined(CONFIG_SOFTMMU)
/*
* There's no guest base to take into account, so go ahead and
* initialize the prologue now.
*/
tcg_prologue_init();
#endif
return 0;
}
static char *tcg_get_thread(Object *obj, Error **errp)
{
TCGState *s = TCG_STATE(obj);
return g_strdup(s->mttcg_enabled ? "multi" : "single");
}
static void tcg_set_thread(Object *obj, const char *value, Error **errp)
{
TCGState *s = TCG_STATE(obj);
if (strcmp(value, "multi") == 0) {
if (TCG_OVERSIZED_GUEST) {
error_setg(errp, "No MTTCG when guest word size > hosts");
} else if (icount_enabled()) {
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
s->mttcg_enabled = true;
}
} else if (strcmp(value, "single") == 0) {
s->mttcg_enabled = false;
} else {
error_setg(errp, "Invalid 'thread' setting %s", value);
}
}
static void tcg_get_tb_size(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
TCGState *s = TCG_STATE(obj);
uint32_t value = s->tb_size;
visit_type_uint32(v, name, &value, errp);
}
static void tcg_set_tb_size(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
TCGState *s = TCG_STATE(obj);
uint32_t value;
if (!visit_type_uint32(v, name, &value, errp)) {
return;
}
s->tb_size = value;
}
static bool tcg_get_splitwx(Object *obj, Error **errp)
{
TCGState *s = TCG_STATE(obj);
return s->splitwx_enabled;
}
static void tcg_set_splitwx(Object *obj, bool value, Error **errp)
{
TCGState *s = TCG_STATE(obj);
s->splitwx_enabled = value;
}
static bool tcg_get_one_insn_per_tb(Object *obj, Error **errp)
{
TCGState *s = TCG_STATE(obj);
return s->one_insn_per_tb;
}
static void tcg_set_one_insn_per_tb(Object *obj, bool value, Error **errp)
{
TCGState *s = TCG_STATE(obj);
s->one_insn_per_tb = value;
/* Set the global also: this changes the behaviour */
qatomic_set(&one_insn_per_tb, value);
}
static int tcg_gdbstub_supported_sstep_flags(void)
{
/*
* In replay mode all events will come from the log and can't be
* suppressed otherwise we would break determinism. However as those
* events are tied to the number of executed instructions we won't see
* them occurring every time we single step.
*/
if (replay_mode != REPLAY_MODE_NONE) {
return SSTEP_ENABLE;
} else {
return SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER;
}
}
static void tcg_accel_class_init(ObjectClass *oc, void *data)
{
AccelClass *ac = ACCEL_CLASS(oc);
ac->name = "tcg";
ac->init_machine = tcg_init_machine;
ac->cpu_common_realize = tcg_exec_realizefn;
ac->cpu_common_unrealize = tcg_exec_unrealizefn;
ac->allowed = &tcg_allowed;
ac->gdbstub_supported_sstep_flags = tcg_gdbstub_supported_sstep_flags;
object_class_property_add_str(oc, "thread",
tcg_get_thread,
tcg_set_thread);
object_class_property_add(oc, "tb-size", "int",
tcg_get_tb_size, tcg_set_tb_size,
NULL, NULL);
object_class_property_set_description(oc, "tb-size",
"TCG translation block cache size");
object_class_property_add_bool(oc, "split-wx",
tcg_get_splitwx, tcg_set_splitwx);
object_class_property_set_description(oc, "split-wx",
"Map jit pages into separate RW and RX regions");
object_class_property_add_bool(oc, "one-insn-per-tb",
tcg_get_one_insn_per_tb,
tcg_set_one_insn_per_tb);
object_class_property_set_description(oc, "one-insn-per-tb",
"Only put one guest insn in each translation block");
}
static const TypeInfo tcg_accel_type = {
.name = TYPE_TCG_ACCEL,
.parent = TYPE_ACCEL,
.instance_init = tcg_accel_instance_init,
.class_init = tcg_accel_class_init,
.instance_size = sizeof(TCGState),
};
module_obj(TYPE_TCG_ACCEL);
static void register_accel_types(void)
{
type_register_static(&tcg_accel_type);
}
type_init(register_accel_types);