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Re: [Qemu-devel] [RFC 08/13] pc: add writeonly 'cpu' property to PCMachi
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [RFC 08/13] pc: add writeonly 'cpu' property to PCMachine |
Date: |
Wed, 18 Jan 2017 16:27:21 -0200 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, Jan 18, 2017 at 06:13:24PM +0100, Igor Mammedov wrote:
> it will allow generic numa code to set cpu to numa node mapping
> in target independent manner in the next patch.
>
> Signed-off-by: Igor Mammedov <address@hidden>
This looks like a creative way to abuse the QOM property system.
What's the problem with using a simple C function like:
void (*set_cpu_affinity)(MachineState *m, CpuInstanceProperties *props, Error
**errp)
?
> ---
> hw/i386/pc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 56 insertions(+)
>
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index f8ea635..1d33a5e 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -2201,6 +2201,56 @@ static void pc_machine_set_pit(Object *obj, bool
> value, Error **errp)
> pcms->pit = value;
> }
>
> +static void pc_machine_set_cpu(Object *obj, Visitor *v, const char *name,
> + void *opaque, Error **errp)
> +{
> + uint32_t apic_id;
> + X86CPUTopoInfo topo;
> + CPUArchId *cpu_slot;
> + Error *local_err = NULL;
> + CpuInstanceProperties *cpu_props = NULL;
> + PCMachineState *pcms = PC_MACHINE(obj);
> + MachineClass *mc = MACHINE_GET_CLASS(obj);
> +
> + visit_type_CpuInstanceProperties(v, name, &cpu_props, &local_err);
> + if (local_err) {
> + goto out;
> + }
> +
> + if (!cpu_props->has_node_id) {
> + error_setg(&local_err, "node-id property is not specified");
> + goto out;
> + }
> +
> + /*
> + * make sure that possible_cpus is initialized
> + * as property setter might be called before machine init is called
> + */
> + mc->possible_cpu_arch_ids(MACHINE(obj));
> +
> + topo.pkg_id = cpu_props->socket_id;
> + topo.core_id = cpu_props->core_id;
> + topo.smt_id = cpu_props->thread_id;
> + apic_id = apicid_from_topo_ids(smp_cores, smp_threads, &topo);
> + cpu_slot = pc_find_cpu_slot(pcms, apic_id, NULL);
> + if (!cpu_slot) {
> + error_setg(&local_err, "unable to find CPU");
> + goto out;
> + }
> +
> + if (cpu_slot->props.has_node_id) {
> + error_setg(&local_err, "CPU has already been assigned to node:
> %"PRId64,
> + cpu_slot->props.node_id);
> + goto out;
> + }
> + cpu_slot->props.has_node_id = true;
> + cpu_slot->props.node_id = cpu_props->node_id;
> +
> + out:
> + error_propagate(errp, local_err);
> + qapi_free_CpuInstanceProperties(cpu_props);
> +}
> +
> static void pc_machine_initfn(Object *obj)
> {
> PCMachineState *pcms = PC_MACHINE(obj);
> @@ -2395,6 +2445,12 @@ static void pc_machine_class_init(ObjectClass *oc,
> void *data)
>
> object_class_property_add_bool(oc, PC_MACHINE_PIT,
> pc_machine_get_pit, pc_machine_set_pit, &error_abort);
> +
> + object_class_property_add(oc, "cpu", "CpuInstanceProperties",
> + NULL, pc_machine_set_cpu,
> + NULL, NULL, &error_abort);
> + object_class_property_set_description(oc, "cpu",
> + "Possible cpu placement", &error_abort);
> }
>
> static const TypeInfo pc_machine_info = {
> --
> 2.7.4
>
--
Eduardo
- [Qemu-devel] [RFC 02/13] pc: cleanup: move smbios_set_cpuid() into pc_build_smbios(), (continued)
- [Qemu-devel] [RFC 02/13] pc: cleanup: move smbios_set_cpuid() into pc_build_smbios(), Igor Mammedov, 2017/01/18
- [Qemu-devel] [RFC 03/13] pc: don't return cpu pointer from pc_new_cpu() as it's not needed anymore, Igor Mammedov, 2017/01/18
- [Qemu-devel] [RFC 04/13] make possible_cpu_arch_ids() return const pointer, Igor Mammedov, 2017/01/18
- [Qemu-devel] [RFC 05/13] pc: move pcms->possible_cpus init out of pc_cpus_init(), Igor Mammedov, 2017/01/18
- [Qemu-devel] [RFC 06/13] pc: calculate topology only once when possible_cpus is initialised, Igor Mammedov, 2017/01/18
- [Qemu-devel] [RFC 08/13] pc: add writeonly 'cpu' property to PCMachine, Igor Mammedov, 2017/01/18
[Qemu-devel] [RFC 07/13] pc: pass apic_id to pc_find_cpu_slot() directly so lookup could be done without CPU object, Igor Mammedov, 2017/01/18
[Qemu-devel] [RFC 09/13] numa: introduce '-numa cpu' cpu option, Igor Mammedov, 2017/01/18