Re: [Qemu-devel] [PATCH 08/12] introduce CPU hot-plug notifier

[Paolo Bonzini <pbonzini@redhat.com>]

Il 21/03/2013 15:28, Igor Mammedov ha scritto:
> hot-added CPU id (APIC ID) will be distributed to acpi_piix4 and rtc_cmos
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  include/sysemu/sysemu.h                 |    4 ++++
>  stubs/Makefile.objs                     |    1 +
>  stubs/qemu_system_cpu_hotplug_request.c |    5 +++++
>  vl.c                                    |   14 ++++++++++++++
>  4 files changed, 24 insertions(+), 0 deletions(-)
>  create mode 100644 stubs/qemu_system_cpu_hotplug_request.c
> 
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index 6578782..4b8f721 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -152,6 +152,10 @@ void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict);
>  /* generic hotplug */
>  void drive_hot_add(Monitor *mon, const QDict *qdict);
>  
> +/* CPU hotplug */
> +void qemu_register_cpu_add_notifier(Notifier *notifier);
> +void qemu_system_cpu_hotplug_request(uint32_t id);
> +
>  /* pcie aer error injection */
>  void pcie_aer_inject_error_print(Monitor *mon, const QObject *data);
>  int do_pcie_aer_inject_error(Monitor *mon,
> diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
> index 9741e16..6a492f5 100644
> --- a/stubs/Makefile.objs
> +++ b/stubs/Makefile.objs
> @@ -25,3 +25,4 @@ stub-obj-y += vmstate.o
>  stub-obj-$(CONFIG_WIN32) += fd-register.o
>  stub-obj-y += resume_vcpu.o
>  stub-obj-y += get_icc_bus.o
> +stub-obj-y += qemu_system_cpu_hotplug_request.o

You're adding one stub per patch.  I think this is a sign that something
can be abstracted at a higher level (e.g. put something in cpus.c if it
is softmmu-specific), or that it is added at the wrong place.

For example, this notifier can go in qom/cpu.c.

(Besides, I noticed now the get_icc_bus stub.  I didn't understand why
it's used, but anyway adding CPU-specific stuff to libqemustub is
absolutely a no-no).

Paolo

> diff --git a/stubs/qemu_system_cpu_hotplug_request.c b/stubs/qemu_system_cpu_hotplug_request.c
> new file mode 100644
> index 0000000..ad4f394
> --- /dev/null
> +++ b/stubs/qemu_system_cpu_hotplug_request.c
> @@ -0,0 +1,5 @@
> +#include <sysemu/sysemu.h>
> +
> +void qemu_system_cpu_hotplug_request(uint32_t id)
> +{
> +}
> diff --git a/vl.c b/vl.c
> index aeed7f4..fd95e43 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1723,6 +1723,20 @@ void vm_start(void)
>      }
>  }
>  
> +/* CPU hot-plug notifiers */
> +static NotifierList cpu_add_notifiers =
> +    NOTIFIER_LIST_INITIALIZER(cpu_add_notifiers);
> +
> +void qemu_register_cpu_add_notifier(Notifier *notifier)
> +{
> +    notifier_list_add(&cpu_add_notifiers, notifier);
> +}
> +
> +void qemu_system_cpu_hotplug_request(uint32_t id)
> +{
> +    notifier_list_notify(&cpu_add_notifiers, &id);
> +}
> +
>  /* reset/shutdown handler */
>  
>  typedef struct QEMUResetEntry {
>