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Re: [Qemu-devel] [PATCH 13/19] target-i386: cpu: attach ICC bus to CPU o


From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH 13/19] target-i386: cpu: attach ICC bus to CPU on its creation
Date: Mon, 15 Apr 2013 17:38:51 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5

Am 11.04.2013 16:51, schrieb Igor Mammedov:
> ... during startup,  so it would be possible to uplug it later

unplug?

> and set bus_type to TYPE_ICC_BUS for X86CPU type to make device_add
> attach hotplugged CPU to ICC bus.
> 
> Signed-off-by: Igor Mammedov <address@hidden>
> ---
>  target-i386/cpu.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> index 4ddc18a..2bb38d6 100644
> --- a/target-i386/cpu.c
> +++ b/target-i386/cpu.c
> @@ -41,6 +41,7 @@
>  #endif
>  
>  #include "sysemu/sysemu.h"
> +#include "hw/i386/icc_bus.h"
>  #ifndef CONFIG_USER_ONLY
>  #include "hw/xen/xen.h"
>  #include "hw/sysbus.h"
> @@ -1610,6 +1611,7 @@ X86CPU *cpu_x86_create(const char *cpu_model, Error 
> **errp)
>      gchar **model_pieces;
>      char *name, *features;
>      Error *error = NULL;
> +    Object *icc_bus = object_resolve_path_type("icc-bus", TYPE_ICC_BUS, 
> NULL);
>  
>      model_pieces = g_strsplit(cpu_model, ",", 2);
>      if (!model_pieces[0]) {
> @@ -1620,6 +1622,10 @@ X86CPU *cpu_x86_create(const char *cpu_model, Error 
> **errp)
>      features = model_pieces[1];
>  
>      cpu = X86_CPU(object_new(TYPE_X86_CPU));
> +    if (icc_bus) {
> +        qdev_set_parent_bus(DEVICE(cpu), BUS(icc_bus));
> +        object_unref(OBJECT(cpu));

Why are you unref'ing here? (Paolo?)

> +    }
>      env = &cpu->env;
>      env->cpu_model_str = cpu_model;
>  

> @@ -2330,6 +2336,7 @@ static void x86_cpu_common_class_init(ObjectClass *oc, 
> void *data)
>  
>      xcc->parent_realize = dc->realize;
>      dc->realize = x86_cpu_realizefn;
> +    dc->bus_type = TYPE_ICC_BUS;
>  
>      xcc->parent_reset = cc->reset;
>      cc->reset = x86_cpu_reset;

I was relieved when I recently saw this was all the magic required to
put it onto the new ICC bus. I thought we'd need to mess with ICCDevice
base classes, but that seems to be used for APIC and IOAPIC only.

Andreas

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