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Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type
From: |
Bharata B Rao |
Subject: |
Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type |
Date: |
Fri, 4 Mar 2016 16:32:53 +0530 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Fri, Mar 04, 2016 at 11:38:45AM +0100, Igor Mammedov wrote:
> On Fri, 4 Mar 2016 12:24:16 +0530
> Bharata B Rao <address@hidden> wrote:
>
> > Add an abstract CPU core type that could be used by machines that want
> > to define and hotplug CPUs in core granularity.
> >
> > Signed-off-by: Bharata B Rao <address@hidden>
> > ---
> > hw/cpu/Makefile.objs | 1 +
> > hw/cpu/core.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
> > include/hw/cpu/core.h | 30 ++++++++++++++++++++++++++++++
> > 3 files changed, 75 insertions(+)
> > create mode 100644 hw/cpu/core.c
> > create mode 100644 include/hw/cpu/core.h
> >
> > diff --git a/hw/cpu/Makefile.objs b/hw/cpu/Makefile.objs
> > index 0954a18..942a4bb 100644
> > --- a/hw/cpu/Makefile.objs
> > +++ b/hw/cpu/Makefile.objs
> > @@ -2,4 +2,5 @@ obj-$(CONFIG_ARM11MPCORE) += arm11mpcore.o
> > obj-$(CONFIG_REALVIEW) += realview_mpcore.o
> > obj-$(CONFIG_A9MPCORE) += a9mpcore.o
> > obj-$(CONFIG_A15MPCORE) += a15mpcore.o
> > +obj-y += core.o
> >
> > diff --git a/hw/cpu/core.c b/hw/cpu/core.c
> > new file mode 100644
> > index 0000000..d8caf37
> > --- /dev/null
> > +++ b/hw/cpu/core.c
> > @@ -0,0 +1,44 @@
> > +/*
> > + * CPU core abstract device
> > + *
> > + * Copyright (C) 2016 Bharata B Rao <address@hidden>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or
> > later.
> > + * See the COPYING file in the top-level directory.
> > + */
> > +#include "hw/cpu/core.h"
> > +
> > +static char *core_prop_get_slot(Object *obj, Error **errp)
> > +{
> > + CPUCore *core = CPU_CORE(obj);
> > +
> > + return g_strdup(core->slot);
> > +}
> > +
> > +static void core_prop_set_slot(Object *obj, const char *val, Error **errp)
> > +{
> > + CPUCore *core = CPU_CORE(obj);
> > +
> > + core->slot = g_strdup(val);
> > +}
> > +
> > +static void cpu_core_instance_init(Object *obj)
> > +{
> > + object_property_add_str(obj, "slot", core_prop_get_slot,
> > core_prop_set_slot,
> > + NULL);
> > +}
> > +
> > +static const TypeInfo cpu_core_type_info = {
> > + .name = TYPE_CPU_CORE,
> > + .parent = TYPE_DEVICE,
> > + .abstract = true,
> > + .instance_size = sizeof(CPUCore),
> > + .instance_init = cpu_core_instance_init,
> > +};
> > +
> > +static void cpu_core_register_types(void)
> > +{
> > + type_register_static(&cpu_core_type_info);
> > +}
> > +
> > +type_init(cpu_core_register_types)
> > diff --git a/include/hw/cpu/core.h b/include/hw/cpu/core.h
> > new file mode 100644
> > index 0000000..2daa724
> > --- /dev/null
> > +++ b/include/hw/cpu/core.h
> > @@ -0,0 +1,30 @@
> > +/*
> > + * CPU core abstract device
> > + *
> > + * Copyright (C) 2016 Bharata B Rao <address@hidden>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or
> > later.
> > + * See the COPYING file in the top-level directory.
> > + */
> > +#ifndef HW_CPU_CORE_H
> > +#define HW_CPU_CORE_H
> > +
> > +#include "qemu/osdep.h"
> > +#include "hw/qdev.h"
> > +
> > +#define TYPE_CPU_CORE "cpu-core"
> > +
> > +#define CPU_CORE(obj) \
> > + OBJECT_CHECK(CPUCore, (obj), TYPE_CPU_CORE)
> > +
> > +typedef struct CPUCore {
> > + /*< private >*/
> > + DeviceState parent_obj;
> > +
> > + /*< public >*/
> > + char *slot;
> > +} CPUCore;
> > +
> > +#define CPU_CORE_SLOT_PROP "slot"
> as it's generic property I'd rename to 'core' so it would fit all users
Ok. Also note that this is a string property which is associated with the
link name (string) that we created from machine object to this core. I think
it would be ideal if this becomes an interger property in which case it
becomes easier to feed the core location into your CPUSlotProperties.core.
> on top of that I'd add numeric 'threads' property to base class so
> all derived cores would inherit it.
>
> Then as easy integration with -smp threads=x, a machine could push
> a global variable 'cpu-core.threads=[smp_threads]' which would
> make every created cpu-core object to have threads set
> at instance_init() time (device_init).
>
> That way user won't have to specify 'threads=y' for every
> device_add spapr-core,core=x
> as it will be taken from global property 'cpu-core.threads'
> but if user wishes he/she still could override global by explicitly
> providing thread property at device_add time:
> device_add spapr-core,core=x,threads=y
>
> wrt this series it would mean, instead of creating threads in property
> setter, delaying threads creation to core.realize() time,
> but since realize is allowed to fail it should be fine do so.
Ok that would suit us as there are two properties on which thread creation
is dependent upon: nr_threads and cpu_model. If thread objects can be
created at core realize time, then we don't have to resort to the ugliness
of creating the threads from either of the property setters. I always
assumed that we shouldn't be creating objects from realize, but if that
is fine, it is good.
Regards,
Bharata.
- Re: [Qemu-devel] [RFC PATCH v1 01/10] exec: Remove cpu from cpus list during cpu_exec_exit(), (continued)
[Qemu-devel] [RFC PATCH v1 02/10] exec: Do vmstate unregistration from cpu_exec_exit(), Bharata B Rao, 2016/03/04
[Qemu-devel] [RFC PATCH v1 03/10] cpu: Reclaim vCPU objects, Bharata B Rao, 2016/03/04
[Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Bharata B Rao, 2016/03/04
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Igor Mammedov, 2016/03/04
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type,
Bharata B Rao <=
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Igor Mammedov, 2016/03/04
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, David Gibson, 2016/03/06
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Bharata B Rao, 2016/03/07
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Igor Mammedov, 2016/03/07
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, David Gibson, 2016/03/07
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Igor Mammedov, 2016/03/08
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, David Gibson, 2016/03/08
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Igor Mammedov, 2016/03/09
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, David Gibson, 2016/03/10
- Re: [Qemu-devel] [RFC PATCH v1 05/10] cpu: Abstract CPU core type, Igor Mammedov, 2016/03/10