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tcg: Add --accel tcg,split-wx property

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Plumb the value through to alloc_code_gen_buffer.  This is not
supported by any os or tcg backend, so for now enabling it will
result in an error.

Reviewed-by: Joelle van Dyne <j@getutm.app>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-10-28 20:50:29 -07:00
parent 6bc144237a
commit a35b3e1415
15 changed files with 72 additions and 12 deletions
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26
accel/tcg/tcg-all.c
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@ -38,6 +38,7 @@ struct TCGState {
AccelState parent_obj;
bool mttcg_enabled;
int splitwx_enabled;
unsigned long tb_size;
};
typedef struct TCGState TCGState;
@ -94,6 +95,13 @@ 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. */
#ifdef CONFIG_DEBUG_TCG
s->splitwx_enabled = -1;
#else
s->splitwx_enabled = 0;
#endif
}
bool mttcg_enabled;
@ -102,7 +110,7 @@ static int tcg_init(MachineState *ms)
{
TCGState *s = TCG_STATE(current_accel());
tcg_exec_init(s->tb_size * 1024 * 1024);
tcg_exec_init(s->tb_size * 1024 * 1024, s->splitwx_enabled);
mttcg_enabled = s->mttcg_enabled;
/*
@ -179,6 +187,18 @@ static void tcg_set_tb_size(Object *obj, Visitor *v,
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 void tcg_accel_class_init(ObjectClass *oc, void *data)
{
AccelClass *ac = ACCEL_CLASS(oc);
@ -196,6 +216,10 @@ static void tcg_accel_class_init(ObjectClass *oc, void *data)
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");
}
static const TypeInfo tcg_accel_type = {