[Qemu-devel] [PATCH 0/5 v2] convert system_powerdown command to notifiers

[Qemu-devel] [PATCH 0/5 v2] convert system_powerdown command to notifiers

[Igor Mammedov]

global variable qemu_system_powerdown in sysemu.h is the only dep for qemu_irq
and qemu_rise_irq is not a generic way to signal guest that it should shutdown.

So replace it by notifiers and allow each implementation to have it's own way
to notify guest.

git repo for testing:
    last 5 commits
    https://github.com/imammedo/qemu/tree/cpu_as_device.WIP

compile tested:
   target-list=x86_64-linux-user,x86_64-softmmu,sparc-softmmu,arm-softmmu
runtime tested:
   x86_64-softmmu + win7 guest

ps:
 reposting because I forgot to add qemu-devel address.
 
Igor Mammedov (5):
  introduce powerdown_notifiers
  acpi: use notifier for signaling guest system_powerdown command
  target-arm: use notifier for signaling guest system_powerdown command
  target-sparc: use notifier for signaling guest system_powerdown
    command
  cleanup unused qemu_system_powerdown

 hw/acpi_piix4.c |  8 +++++---
 hw/nseries.c    | 14 +++++++++++++-
 hw/sun4m.c      | 14 +++++++++++++-
 sysemu.h        |  3 +--
 vl.c            | 18 ++++++++++++++----
 5 files changed, 46 insertions(+), 11 deletions(-)

-- 
1.7.11.4

[Qemu-devel] [PATCH 1/5] introduce powerdown_notifiers

[Igor Mammedov]

notifier will be used for signaling powerdown request to guest in more
general way and intended to replace very specific
qemu_irq_rise(qemu_system_powerdown) and will allow to remove global
variable qemu_system_powerdown.

v2:
  do not make qemu_system_powerdown static,
      spotted-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 sysemu.h |  1 +
 vl.c     | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/sysemu.h b/sysemu.h
index f765821..eb9a750 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -53,6 +53,7 @@ void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
 void qemu_register_wakeup_notifier(Notifier *notifier);
 void qemu_system_shutdown_request(void);
 void qemu_system_powerdown_request(void);
+void qemu_register_powerdown_notifier(Notifier *notifier);
 void qemu_system_debug_request(void);
 void qemu_system_vmstop_request(RunState reason);
 int qemu_shutdown_requested_get(void);
diff --git a/vl.c b/vl.c
index 7c577fa..8dc4b4f 100644
--- a/vl.c
+++ b/vl.c
@@ -1355,6 +1355,8 @@ static int powerdown_requested;
 static int debug_requested;
 static int suspend_requested;
 static int wakeup_requested;
+static NotifierList powerdown_notifiers =
+    NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
 static NotifierList suspend_notifiers =
     NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
 static NotifierList wakeup_notifiers =
@@ -1563,12 +1565,23 @@ void qemu_system_shutdown_request(void)
     qemu_notify_event();
 }
 
+static void qemu_system_powerdown(void)
+{
+    monitor_protocol_event(QEVENT_POWERDOWN, NULL);
+    notifier_list_notify(&powerdown_notifiers, NULL);
+}
+
 void qemu_system_powerdown_request(void)
 {
     powerdown_requested = 1;
     qemu_notify_event();
 }
 
+void qemu_register_powerdown_notifier(Notifier *notifier)
+{
+    notifier_list_add(&powerdown_notifiers, notifier);
+}
+
 void qemu_system_debug_request(void)
 {
     debug_requested = 1;
@@ -1619,7 +1632,7 @@ static bool main_loop_should_exit(void)
         monitor_protocol_event(QEVENT_WAKEUP, NULL);
     }
     if (qemu_powerdown_requested()) {
-        monitor_protocol_event(QEVENT_POWERDOWN, NULL);
+        qemu_system_powerdown();
         qemu_irq_raise(qemu_system_powerdown);
     }
     if (qemu_vmstop_requested(&r)) {
-- 
1.7.11.4

Re: [Qemu-devel] [PATCH 1/5] introduce powerdown_notifiers

[Andreas Färber]

Am 29.08.2012 19:02, schrieb Igor Mammedov:
> notifier will be used for signaling powerdown request to guest in more
> general way and intended to replace very specific
> qemu_irq_rise(qemu_system_powerdown) and will allow to remove global
> variable qemu_system_powerdown.
> 
> v2:
>   do not make qemu_system_powerdown static,
>       spotted-by: Paolo Bonzini <pbonzini@redhat.com>

Is the "not" a typo or did you send the wrong patch? It seems to be
static below.

Andreas

> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  sysemu.h |  1 +
>  vl.c     | 15 ++++++++++++++-
>  2 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/sysemu.h b/sysemu.h
> index f765821..eb9a750 100644
> --- a/sysemu.h
> +++ b/sysemu.h
> @@ -53,6 +53,7 @@ void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
>  void qemu_register_wakeup_notifier(Notifier *notifier);
>  void qemu_system_shutdown_request(void);
>  void qemu_system_powerdown_request(void);
> +void qemu_register_powerdown_notifier(Notifier *notifier);
>  void qemu_system_debug_request(void);
>  void qemu_system_vmstop_request(RunState reason);
>  int qemu_shutdown_requested_get(void);
> diff --git a/vl.c b/vl.c
> index 7c577fa..8dc4b4f 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1355,6 +1355,8 @@ static int powerdown_requested;
>  static int debug_requested;
>  static int suspend_requested;
>  static int wakeup_requested;
> +static NotifierList powerdown_notifiers =
> +    NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
>  static NotifierList suspend_notifiers =
>      NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
>  static NotifierList wakeup_notifiers =
> @@ -1563,12 +1565,23 @@ void qemu_system_shutdown_request(void)
>      qemu_notify_event();
>  }
>  
> +static void qemu_system_powerdown(void)
> +{
> +    monitor_protocol_event(QEVENT_POWERDOWN, NULL);
> +    notifier_list_notify(&powerdown_notifiers, NULL);
> +}
> +
>  void qemu_system_powerdown_request(void)
>  {
>      powerdown_requested = 1;
>      qemu_notify_event();
>  }
>  
> +void qemu_register_powerdown_notifier(Notifier *notifier)
> +{
> +    notifier_list_add(&powerdown_notifiers, notifier);
> +}
> +
>  void qemu_system_debug_request(void)
>  {
>      debug_requested = 1;
> @@ -1619,7 +1632,7 @@ static bool main_loop_should_exit(void)
>          monitor_protocol_event(QEVENT_WAKEUP, NULL);
>      }
>      if (qemu_powerdown_requested()) {
> -        monitor_protocol_event(QEVENT_POWERDOWN, NULL);
> +        qemu_system_powerdown();
>          qemu_irq_raise(qemu_system_powerdown);
>      }
>      if (qemu_vmstop_requested(&r)) {
> 


-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

Re: [Qemu-devel] [PATCH 1/5] introduce powerdown_notifiers

[Igor Mammedov]

On Wed, 29 Aug 2012 19:06:45 +0200
Andreas Färber <afaerber@suse.de> wrote:

> Am 29.08.2012 19:02, schrieb Igor Mammedov:
> > notifier will be used for signaling powerdown request to guest in more
> > general way and intended to replace very specific
> > qemu_irq_rise(qemu_system_powerdown) and will allow to remove global
> > variable qemu_system_powerdown.
> > 
> > v2:
> >   do not make qemu_system_powerdown static,
> >       spotted-by: Paolo Bonzini <pbonzini@redhat.com>
> 
> Is the "not" a typo or did you send the wrong patch? It seems to be
> static below.

Nope, it's not typo. There is global var qemu_system_powerdown, and in the
first version I've changed it to static for no good reason and that killed
bisectability of series. So I've reverted it to original state.

> 
> Andreas
> 
> > 
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ---
> >  sysemu.h |  1 +
> >  vl.c     | 15 ++++++++++++++-
> >  2 files changed, 15 insertions(+), 1 deletion(-)
> > 
> > diff --git a/sysemu.h b/sysemu.h
> > index f765821..eb9a750 100644
> > --- a/sysemu.h
> > +++ b/sysemu.h
> > @@ -53,6 +53,7 @@ void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
> >  void qemu_register_wakeup_notifier(Notifier *notifier);
> >  void qemu_system_shutdown_request(void);
> >  void qemu_system_powerdown_request(void);
> > +void qemu_register_powerdown_notifier(Notifier *notifier);
> >  void qemu_system_debug_request(void);
> >  void qemu_system_vmstop_request(RunState reason);
> >  int qemu_shutdown_requested_get(void);
> > diff --git a/vl.c b/vl.c
> > index 7c577fa..8dc4b4f 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -1355,6 +1355,8 @@ static int powerdown_requested;
> >  static int debug_requested;
> >  static int suspend_requested;
> >  static int wakeup_requested;
> > +static NotifierList powerdown_notifiers =
> > +    NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
> >  static NotifierList suspend_notifiers =
> >      NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
> >  static NotifierList wakeup_notifiers =
> > @@ -1563,12 +1565,23 @@ void qemu_system_shutdown_request(void)
> >      qemu_notify_event();
> >  }
> >  
> > +static void qemu_system_powerdown(void)
> > +{
> > +    monitor_protocol_event(QEVENT_POWERDOWN, NULL);
> > +    notifier_list_notify(&powerdown_notifiers, NULL);
> > +}
> > +
> >  void qemu_system_powerdown_request(void)
> >  {
> >      powerdown_requested = 1;
> >      qemu_notify_event();
> >  }
> >  
> > +void qemu_register_powerdown_notifier(Notifier *notifier)
> > +{
> > +    notifier_list_add(&powerdown_notifiers, notifier);
> > +}
> > +
> >  void qemu_system_debug_request(void)
> >  {
> >      debug_requested = 1;
> > @@ -1619,7 +1632,7 @@ static bool main_loop_should_exit(void)
> >          monitor_protocol_event(QEVENT_WAKEUP, NULL);
> >      }
> >      if (qemu_powerdown_requested()) {
> > -        monitor_protocol_event(QEVENT_POWERDOWN, NULL);
> > +        qemu_system_powerdown();
> >          qemu_irq_raise(qemu_system_powerdown);
> >      }
> >      if (qemu_vmstop_requested(&r)) {
> > 
> 
> 
> -- 
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
> 


-- 
Regards,
  Igor

Re: [Qemu-devel] [PATCH 1/5] introduce powerdown_notifiers

[Igor Mammedov]

On Wed, 29 Aug 2012 19:06:45 +0200
Andreas Färber <afaerber@suse.de> wrote:

> Am 29.08.2012 19:02, schrieb Igor Mammedov:
> > notifier will be used for signaling powerdown request to guest in more
> > general way and intended to replace very specific
> > qemu_irq_rise(qemu_system_powerdown) and will allow to remove global
> > variable qemu_system_powerdown.
> > 
> > v2:
> >   do not make qemu_system_powerdown static,
> >       spotted-by: Paolo Bonzini <pbonzini@redhat.com>
> 
> Is the "not" a typo or did you send the wrong patch? It seems to be
> static below.
> 
> Andreas
> 
> > 
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ---
> >  sysemu.h |  1 +
> >  vl.c     | 15 ++++++++++++++-
> >  2 files changed, 15 insertions(+), 1 deletion(-)
> > 
> > diff --git a/sysemu.h b/sysemu.h
> > index f765821..eb9a750 100644
> > --- a/sysemu.h
> > +++ b/sysemu.h
> > @@ -53,6 +53,7 @@ void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
> >  void qemu_register_wakeup_notifier(Notifier *notifier);
> >  void qemu_system_shutdown_request(void);
> >  void qemu_system_powerdown_request(void);
> > +void qemu_register_powerdown_notifier(Notifier *notifier);
> >  void qemu_system_debug_request(void);
> >  void qemu_system_vmstop_request(RunState reason);
> >  int qemu_shutdown_requested_get(void);
> > diff --git a/vl.c b/vl.c
> > index 7c577fa..8dc4b4f 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -1355,6 +1355,8 @@ static int powerdown_requested;
> >  static int debug_requested;
> >  static int suspend_requested;
> >  static int wakeup_requested;
> > +static NotifierList powerdown_notifiers =
> > +    NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
> >  static NotifierList suspend_notifiers =
> >      NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
> >  static NotifierList wakeup_notifiers =
> > @@ -1563,12 +1565,23 @@ void qemu_system_shutdown_request(void)
> >      qemu_notify_event();
> >  }
> >  
> > +static void qemu_system_powerdown(void)
this is a bad naming that conflicts with global var qemu_system_powerdown, so
bisectability of series is still broken.
perhaps qemu_do_system_powerdown() would be better for function name,
although it doesn't match common name pattern used for this kind of functions.

> > +{
> > +    monitor_protocol_event(QEVENT_POWERDOWN, NULL);
> > +    notifier_list_notify(&powerdown_notifiers, NULL);
> > +}
> > +
> >  void qemu_system_powerdown_request(void)
> >  {
> >      powerdown_requested = 1;
> >      qemu_notify_event();
> >  }
> >  
> > +void qemu_register_powerdown_notifier(Notifier *notifier)
> > +{
> > +    notifier_list_add(&powerdown_notifiers, notifier);
> > +}
> > +
> >  void qemu_system_debug_request(void)
> >  {
> >      debug_requested = 1;
> > @@ -1619,7 +1632,7 @@ static bool main_loop_should_exit(void)
> >          monitor_protocol_event(QEVENT_WAKEUP, NULL);
> >      }
> >      if (qemu_powerdown_requested()) {
> > -        monitor_protocol_event(QEVENT_POWERDOWN, NULL);
> > +        qemu_system_powerdown();
> >          qemu_irq_raise(qemu_system_powerdown);
> >      }
> >      if (qemu_vmstop_requested(&r)) {
> > 
> 
> 
> -- 
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg


-- 
Regards,
  Igor

Re: [Qemu-devel] [PATCH 1/5] introduce powerdown_notifiers

[Paolo Bonzini]

Il 30/08/2012 08:49, Igor Mammedov ha scritto:
>>> > > +static void qemu_system_powerdown(void)
> this is a bad naming that conflicts with global var qemu_system_powerdown, so
> bisectability of series is still broken.
> perhaps qemu_do_system_powerdown() would be better for function name,
> although it doesn't match common name pattern used for this kind of functions.
> 

Just inline the function in this patch, and uninline it later.

Paolo

Re: [Qemu-devel] [PATCH 1/5] introduce powerdown_notifiers

[Igor Mammedov]

On Thu, 30 Aug 2012 09:41:55 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Il 30/08/2012 08:49, Igor Mammedov ha scritto:
> >>> > > +static void qemu_system_powerdown(void)
> > this is a bad naming that conflicts with global var qemu_system_powerdown, so
> > bisectability of series is still broken.
> > perhaps qemu_do_system_powerdown() would be better for function name,
> > although it doesn't match common name pattern used for this kind of functions.
> > 
> 
> Just inline the function in this patch, and uninline it later.
Thanks, fixed in https://github.com/imammedo/qemu/tree/cpu_as_device.WIP
> 
> Paolo
> 


-- 
Regards,
  Igor

[Qemu-devel] [PATCH 2/5] acpi: use notifier for signaling guest system_powerdown command

[Igor Mammedov]

In addition, there is no need to allocate an extra irq just for
rising SCI in irq handler. Just rise SCI right from notifier
handler instead.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi_piix4.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/acpi_piix4.c b/hw/acpi_piix4.c
index 72d6e5c..4b9d0e8 100644
--- a/hw/acpi_piix4.c
+++ b/hw/acpi_piix4.c
@@ -67,6 +67,7 @@ typedef struct PIIX4PMState {
     qemu_irq smi_irq;
     int kvm_enabled;
     Notifier machine_ready;
+    Notifier powerdown_notifier;
 
     /* for pci hotplug */
     struct pci_status pci0_status;
@@ -359,9 +360,9 @@ static void piix4_reset(void *opaque)
     piix4_update_hotplug(s);
 }
 
-static void piix4_powerdown(void *opaque, int irq, int power_failing)
+static void piix4_pm_powerdown_req(Notifier *n, void *opaque)
 {
-    PIIX4PMState *s = opaque;
+    PIIX4PMState *s = container_of(n, PIIX4PMState, powerdown_notifier);
 
     assert(s != NULL);
     acpi_pm1_evt_power_down(&s->ar);
@@ -415,7 +416,8 @@ static int piix4_pm_initfn(PCIDevice *dev)
     acpi_pm_tmr_init(&s->ar, pm_tmr_timer);
     acpi_gpe_init(&s->ar, GPE_LEN);
 
-    qemu_system_powerdown = *qemu_allocate_irqs(piix4_powerdown, s, 1);
+    s->powerdown_notifier.notify = piix4_pm_powerdown_req;
+    qemu_register_powerdown_notifier(&s->powerdown_notifier);
 
     pm_smbus_init(&s->dev.qdev, &s->smb);
     s->machine_ready.notify = piix4_pm_machine_ready;
-- 
1.7.11.4

[Qemu-devel] [PATCH 3/5] target-arm: use notifier for signaling guest system_powerdown command

[Igor Mammedov]

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/nseries.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/hw/nseries.c b/hw/nseries.c
index 4df2670..6df71eb 100644
--- a/hw/nseries.c
+++ b/hw/nseries.c
@@ -189,6 +189,17 @@ static void n8x0_nand_setup(struct n800_s *s)
     /* XXX: in theory should also update the OOB for both pages */
 }
 
+static qemu_irq n8x0_system_powerdown;
+
+static void n8x0_powerdown_req(Notifier *n, void *opaque)
+{
+    qemu_irq_raise(n8x0_system_powerdown);
+}
+
+static Notifier n8x0_system_powerdown_notifier = {
+    .notify = n8x0_powerdown_req
+};
+
 static void n8x0_i2c_setup(struct n800_s *s)
 {
     DeviceState *dev;
@@ -201,7 +212,8 @@ static void n8x0_i2c_setup(struct n800_s *s)
                           qdev_get_gpio_in(s->mpu->ih[0],
                                            OMAP_INT_24XX_SYS_NIRQ));
 
-    qemu_system_powerdown = qdev_get_gpio_in(dev, 3);
+    n8x0_system_powerdown = qdev_get_gpio_in(dev, 3);
+    qemu_register_powerdown_notifier(&n8x0_system_powerdown_notifier);
 
     /* Attach a TMP105 PM chip (A0 wired to ground) */
     dev = i2c_create_slave(i2c, "tmp105", N8X0_TMP105_ADDR);
-- 
1.7.11.4

[Qemu-devel] [PATCH 4/5] target-sparc: use notifier for signaling guest system_powerdown command

[Igor Mammedov]

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/sun4m.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/hw/sun4m.c b/hw/sun4m.c
index 0f909b5..c98cd5e 100644
--- a/hw/sun4m.c
+++ b/hw/sun4m.c
@@ -472,6 +472,17 @@ static void slavio_timer_init_all(target_phys_addr_t addr, qemu_irq master_irq,
     }
 }
 
+static qemu_irq  slavio_system_powerdown;
+
+static void slavio_powerdown_req(Notifier *n, void *opaque)
+{
+    qemu_irq_raise(slavio_system_powerdown);
+}
+
+static Notifier slavio_system_powerdown_notifier = {
+    .notify = slavio_powerdown_req
+};
+
 #define MISC_LEDS 0x01600000
 #define MISC_CFG  0x01800000
 #define MISC_DIAG 0x01a00000
@@ -514,7 +525,8 @@ static void slavio_misc_init(target_phys_addr_t base,
     }
     sysbus_connect_irq(s, 0, irq);
     sysbus_connect_irq(s, 1, fdc_tc);
-    qemu_system_powerdown = qdev_get_gpio_in(dev, 0);
+    slavio_system_powerdown = qdev_get_gpio_in(dev, 0);
+    qemu_register_powerdown_notifier(&slavio_system_powerdown_notifier);
 }
 
 static void ecc_init(target_phys_addr_t base, qemu_irq irq, uint32_t version)
-- 
1.7.11.4

[Qemu-devel] [PATCH 5/5] cleanup unused qemu_system_powerdown

[Igor Mammedov]

all deps that used qemu_system_powerdown are converted to notifiers,
so remove it for have no use anymore

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 sysemu.h | 2 --
 vl.c     | 3 ---
 2 files changed, 5 deletions(-)

diff --git a/sysemu.h b/sysemu.h
index eb9a750..1093046 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -9,7 +9,6 @@
 #include "qapi-types.h"
 #include "notify.h"
 #include "main-loop.h"
-#include "hw/irq.h"
 
 /* vl.c */
 
@@ -63,7 +62,6 @@ int qemu_reset_requested(void);
 int qemu_powerdown_requested(void);
 void qemu_system_killed(int signal, pid_t pid);
 void qemu_kill_report(void);
-extern qemu_irq qemu_system_powerdown;
 void qemu_devices_reset(void);
 void qemu_system_reset(bool report);
 
diff --git a/vl.c b/vl.c
index 8dc4b4f..e0d1295 100644
--- a/vl.c
+++ b/vl.c
@@ -1594,8 +1594,6 @@ void qemu_system_vmstop_request(RunState state)
     qemu_notify_event();
 }
 
-qemu_irq qemu_system_powerdown;
-
 static bool main_loop_should_exit(void)
 {
     RunState r;
@@ -1633,7 +1631,6 @@ static bool main_loop_should_exit(void)
     }
     if (qemu_powerdown_requested()) {
         qemu_system_powerdown();
-        qemu_irq_raise(qemu_system_powerdown);
     }
     if (qemu_vmstop_requested(&r)) {
         vm_stop(r);
-- 
1.7.11.4

[Qemu-devel] [PATCH 0/5 v3] convert system_powerdown command to notifiers

[Igor Mammedov]

global variable qemu_system_powerdown in sysemu.h is the only dep for qemu_irq
and qemu_rise_irq is not a generic way to signal guest that it should shutdown.

replace it by notifiers and allow each implementation to have it's own way
to notify guest.

git repo for testing:
    https://github.com/imammedo/qemu/tree/shutdown_notifier.v3

compile tested:
   target-list=x86_64-linux-user,x86_64-softmmu,sparc-softmmu,arm-softmmu
runtime tested:
   x86_64-softmmu + win7 guest

v3-v2:
    - fixed bisectably issues of series
    - make series independed of cpu_as_device series
 
Igor Mammedov (5):
  Introduce powerdown_notifiers
  acpi: use notifier for signaling guest system_powerdown command
  target-arm: use notifier for signaling guest system_powerdown command
  target-sparc: use notifier for signaling guest system_powerdown
    command
  Cleanup unused global var qemu_system_powerdown

 hw/acpi_piix4.c |  8 +++++---
 hw/nseries.c    | 14 +++++++++++++-
 hw/sun4m.c      | 14 +++++++++++++-
 sysemu.h        |  2 +-
 vl.c            | 18 ++++++++++++++----
 5 files changed, 46 insertions(+), 10 deletions(-)

-- 
1.7.11.4

[Qemu-devel] [PATCH 1/5] Introduce powerdown_notifiers

[Igor Mammedov]

Notifier will be used for signaling powerdown request to guest in
a more general way and intended to replace very specific
qemu_irq_rise(qemu_system_powerdown) and will allow to remove global
variable qemu_system_powerdown.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 sysemu.h | 1 +
 vl.c     | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/sysemu.h b/sysemu.h
index 65552ac..803c858 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -52,6 +52,7 @@ void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
 void qemu_register_wakeup_notifier(Notifier *notifier);
 void qemu_system_shutdown_request(void);
 void qemu_system_powerdown_request(void);
+void qemu_register_powerdown_notifier(Notifier *notifier);
 void qemu_system_debug_request(void);
 void qemu_system_vmstop_request(RunState reason);
 int qemu_shutdown_requested_get(void);
diff --git a/vl.c b/vl.c
index 7c577fa..4893192 100644
--- a/vl.c
+++ b/vl.c
@@ -1355,6 +1355,8 @@ static int powerdown_requested;
 static int debug_requested;
 static int suspend_requested;
 static int wakeup_requested;
+static NotifierList powerdown_notifiers =
+    NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
 static NotifierList suspend_notifiers =
     NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
 static NotifierList wakeup_notifiers =
@@ -1569,6 +1571,11 @@ void qemu_system_powerdown_request(void)
     qemu_notify_event();
 }
 
+void qemu_register_powerdown_notifier(Notifier *notifier)
+{
+    notifier_list_add(&powerdown_notifiers, notifier);
+}
+
 void qemu_system_debug_request(void)
 {
     debug_requested = 1;
@@ -1620,6 +1627,7 @@ static bool main_loop_should_exit(void)
     }
     if (qemu_powerdown_requested()) {
         monitor_protocol_event(QEVENT_POWERDOWN, NULL);
+        notifier_list_notify(&powerdown_notifiers, NULL);
         qemu_irq_raise(qemu_system_powerdown);
     }
     if (qemu_vmstop_requested(&r)) {
-- 
1.7.11.4