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accel: add init_accel_cpu for adapting accel behavior to CPU type

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while on x86 all CPU classes can use the same set of TCGCPUOps,
on ARM the right accel behavior depends on the type of the CPU.

So we need a way to specialize the accel behavior according to
the CPU. Therefore, add a second initialization, after the
accel_cpu->cpu_class_init, that allows to do this.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210322132800.7470-24-cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Claudio Fontana 2021-03-22 14:27:59 +01:00 committed by Paolo Bonzini
parent 92242f34ab
commit cc3f2be6b7
3 changed files with 26 additions and 1 deletions
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13
accel/accel-common.c
View file

@ -54,10 +54,23 @@ static void accel_init_cpu_int_aux(ObjectClass *klass, void *opaque)
CPUClass *cc = CPU_CLASS(klass);
AccelCPUClass *accel_cpu = opaque;
/*
* The first callback allows accel-cpu to run initializations
* for the CPU, customizing CPU behavior according to the accelerator.
*
* The second one allows the CPU to customize the accel-cpu
* behavior according to the CPU.
*
* The second is currently only used by TCG, to specialize the
* TCGCPUOps depending on the CPU type.
*/
cc->accel_cpu = accel_cpu;
if (accel_cpu->cpu_class_init) {
accel_cpu->cpu_class_init(cc);
}
if (cc->init_accel_cpu) {
cc->init_accel_cpu(accel_cpu, cc);
}
}
/* initialize the arch-specific accel CpuClass interfaces */

6
include/hw/core/cpu.h
View file

@ -192,6 +192,12 @@ struct CPUClass {
/* when TCG is not available, this pointer is NULL */
struct TCGCPUOps *tcg_ops;
/*
* if not NULL, this is called in order for the CPUClass to initialize
* class data that depends on the accelerator, see accel/accel-common.c.
*/
void (*init_accel_cpu)(struct AccelCPUClass *accel_cpu, CPUClass *cc);
};
/*

8
target/i386/tcg/tcg-cpu.c
View file

@ -69,9 +69,15 @@ static struct TCGCPUOps x86_tcg_ops = {
#endif /* !CONFIG_USER_ONLY */
};
static void tcg_cpu_init_ops(AccelCPUClass *accel_cpu, CPUClass *cc)
{
/* for x86, all cpus use the same set of operations */
cc->tcg_ops = &x86_tcg_ops;
}
static void tcg_cpu_class_init(CPUClass *cc)
{
cc->tcg_ops = &x86_tcg_ops;
cc->init_accel_cpu = tcg_cpu_init_ops;
}
/*