Re: [Qemu-devel] [PATCH 05/16] introduce CPU hot-plug notifier

[Igor Mammedov]

On Mon, 22 Apr 2013 14:00:01 +0300
Gleb Natapov <address@hidden> wrote:

> On Tue, Apr 16, 2013 at 12:12:45AM +0200, Igor Mammedov wrote:
> > hot-added CPU will be distributed to acpi_piix4 and rtc_cmos
> > 
> > Signed-off-by: Igor Mammedov <address@hidden>
> > Reviewed-by: Paolo Bonzini <address@hidden>
> > Reviewed-by: Eduardo Habkost <address@hidden>
> > ---
> > v2:
> >   * move notifier to qom/cpu.c and call it from CPUClass.realize() on
> > hotplug
> >   * remove get_firmware_id() since it belong to other patch
> > ---
> >  include/sysemu/sysemu.h |  3 +++
> >  qom/cpu.c               | 12 ++++++++++++
> >  2 files changed, 15 insertions(+)
> > 
> > diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> > index 6578782..a8c3de1 100644
> > --- a/include/sysemu/sysemu.h
> > +++ b/include/sysemu/sysemu.h
> > @@ -152,6 +152,9 @@ 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_added_notifier(Notifier *notifier);
> > +
> >  /* 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/qom/cpu.c b/qom/cpu.c
> > index 40a4259..819986e 100644
> > --- a/qom/cpu.c
> > +++ b/qom/cpu.c
> > @@ -21,6 +21,17 @@
> >  #include "qom/cpu.h"
> >  #include "qemu-common.h"
> >  #include "sysemu/kvm.h"
> > +#include "qemu/notify.h"
> > +#include "sysemu/sysemu.h"
> > +
> > +/* CPU hot-plug notifiers */
> > +static NotifierList cpu_added_notifiers =
> > +    NOTIFIER_LIST_INITIALIZER(cpu_add_notifiers);
> > +
> > +void qemu_register_cpu_added_notifier(Notifier *notifier)
> > +{
> > +    notifier_list_add(&cpu_added_notifiers, notifier);
> > +}
> >  
> >  void cpu_reset_interrupt(CPUState *cpu, int mask)
> >  {
> > @@ -61,6 +72,7 @@ static void cpu_common_realizefn(DeviceState *dev,
> > Error **errp) if (dev->hotplugged) {
> >          cpu_synchronize_post_init(CPU(dev));
> >          resume_vcpu(CPU(dev));
> > +        notifier_list_notify(&cpu_added_notifiers, dev);
> Why do it after vcpu is running? May be notifier want to do something
> that should be done before vcpu is running.
currently there is not need for adding_cpu notifier.
This one signals that there is a new fully functional CPU available.

> >      }
> >  }
> >  
> > -- 
> > 1.8.2
> > 
> > 
> 
> --
>                       Gleb.