[V6,4/9] hw/acpi: Init GED framework with CPU hotplug events

Commit Message

Salil Mehta Oct. 13, 2023, 10:51 a.m. UTC

ACPI GED(as described in the ACPI 6.2 spec) can be used to generate ACPI events
when OSPM/guest receives an interrupt listed in the _CRS object of GED. OSPM
then maps or demultiplexes the event by evaluating _EVT method.

This change adds the support of CPU hotplug event initialization in the
existing GED framework.

Co-developed-by: Keqian Zhu <[e-mail]>
Signed-off-by: Keqian Zhu <[e-mail]>
Signed-off-by: Salil Mehta <[e-mail]>
Reviewed-by: Jonathan Cameron <[e-mail]>
Reviewed-by: Gavin Shan <[e-mail]>
Reviewed-by: David Hildenbrand <[e-mail]>
Tested-by: Vishnu Pajjuri <[e-mail]>
Tested-by: Xianglai Li <[e-mail]>
---
 hw/acpi/generic_event_device.c         | 8 ++++++++
 include/hw/acpi/generic_event_device.h | 5 +++++
 2 files changed, 13 insertions(+)

Comments

Alex Bennée Oct. 19, 2023, 10:16 a.m. UTC | #1

Salil Mehta <[e-mail]> writes:

> ACPI GED(as described in the ACPI 6.2 spec) can be used to generate ACPI events
> when OSPM/guest receives an interrupt listed in the _CRS object of GED. OSPM
> then maps or demultiplexes the event by evaluating _EVT method.
>
> This change adds the support of CPU hotplug event initialization in the
> existing GED framework.

Should we also update the docs here:

  https://qemu.readthedocs.io/en/master/specs/acpi_hw_reduced_hotplug.html

(see docs/specs/acpi_hw_reduced_hotplug.rst)

to add the new bits? Or maybe an update to documentation as the last
commit?

>
> Co-developed-by: Keqian Zhu <[e-mail]>
> Signed-off-by: Keqian Zhu <[e-mail]>
> Signed-off-by: Salil Mehta <[e-mail]>
> Reviewed-by: Jonathan Cameron <[e-mail]>
> Reviewed-by: Gavin Shan <[e-mail]>
> Reviewed-by: David Hildenbrand <[e-mail]>
> Tested-by: Vishnu Pajjuri <[e-mail]>
> Tested-by: Xianglai Li <[e-mail]>
> ---
>  hw/acpi/generic_event_device.c         | 8 ++++++++
>  include/hw/acpi/generic_event_device.h | 5 +++++
>  2 files changed, 13 insertions(+)
>
> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> index a3d31631fe..d2fa1d0e4a 100644
> --- a/hw/acpi/generic_event_device.c
> +++ b/hw/acpi/generic_event_device.c
> @@ -25,6 +25,7 @@ static const uint32_t ged_supported_events[] = {
>      ACPI_GED_MEM_HOTPLUG_EVT,
>      ACPI_GED_PWR_DOWN_EVT,
>      ACPI_GED_NVDIMM_HOTPLUG_EVT,
> +    ACPI_GED_CPU_HOTPLUG_EVT,
>  };
>  
>  /*
> @@ -400,6 +401,13 @@ static void acpi_ged_initfn(Object *obj)
>      memory_region_init_io(&ged_st->regs, obj, &ged_regs_ops, ged_st,
>                            TYPE_ACPI_GED "-regs", ACPI_GED_REG_COUNT);
>      sysbus_init_mmio(sbd, &ged_st->regs);
> +
> +    s->cpuhp.device = OBJECT(s);
> +    memory_region_init(&s->container_cpuhp, OBJECT(dev), "cpuhp container",
> +                       ACPI_CPU_HOTPLUG_REG_LEN);
> +    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->container_cpuhp);
> +    cpu_hotplug_hw_init(&s->container_cpuhp, OBJECT(dev),
> +                        &s->cpuhp_state, 0);
>  }
>  
>  static void acpi_ged_class_init(ObjectClass *class, void *data)
> diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h
> index ba84ce0214..a803ea818e 100644
> --- a/include/hw/acpi/generic_event_device.h
> +++ b/include/hw/acpi/generic_event_device.h
> @@ -60,6 +60,7 @@
>  #define HW_ACPI_GENERIC_EVENT_DEVICE_H
>  
>  #include "hw/sysbus.h"
> +#include "hw/acpi/cpu_hotplug.h"
>  #include "hw/acpi/memory_hotplug.h"
>  #include "hw/acpi/ghes.h"
>  #include "qom/object.h"
> @@ -95,6 +96,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
>  #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
>  #define ACPI_GED_PWR_DOWN_EVT      0x2
>  #define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
> +#define ACPI_GED_CPU_HOTPLUG_EVT    0x8
>  
>  typedef struct GEDState {
>      MemoryRegion evt;
> @@ -106,6 +108,9 @@ struct AcpiGedState {
>      SysBusDevice parent_obj;
>      MemHotplugState memhp_state;
>      MemoryRegion container_memhp;
> +    CPUHotplugState cpuhp_state;
> +    MemoryRegion container_cpuhp;
> +    AcpiCpuHotplug cpuhp;
>      GEDState ged_state;
>      uint32_t ged_event_bitmap;
>      qemu_irq irq;

Salil Mehta Oct. 19, 2023, 10:27 a.m. UTC | #2

Hi Alex,

> From: Alex Bennée <[e-mail]>
> Sent: Thursday, October 19, 2023 11:16 AM
> To: Salil Mehta <[e-mail]>
> Cc: [e-mail]; [e-mail]; [e-mail]; jean-
> [e-mail]; Jonathan Cameron <[e-mail]>;
> [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> [e-mail]; [e-mail];
> [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> zhukeqian <[e-mail]>; wangxiongfeng (C)
> <[e-mail]>; wangyanan (Y) <[e-mail]>;
> [e-mail]; [e-mail]; [e-mail]; Linuxarm
> <[e-mail]>
> Subject: Re: [PATCH V6 4/9] hw/acpi: Init GED framework with CPU hotplug
> events
> 
> 
> Salil Mehta <[e-mail]> writes:
> 
> > ACPI GED(as described in the ACPI 6.2 spec) can be used to generate ACPI events
> > when OSPM/guest receives an interrupt listed in the _CRS object of GED. OSPM
> > then maps or demultiplexes the event by evaluating _EVT method.
> >
> > This change adds the support of CPU hotplug event initialization in the
> > existing GED framework.
> 
> Should we also update the docs here:
> 
>   https://qemu.readthedocs.io/en/master/specs/acpi_hw_reduced_hotplug.html
> 
> (see docs/specs/acpi_hw_reduced_hotplug.rst)


Good point. Will do.


> to add the new bits? Or maybe an update to documentation as the last
> commit?

Will add one more patch at the last for this documentation change.

Thanks for identifying this.

Cheers
Salil.


> 
> >
> > Co-developed-by: Keqian Zhu <[e-mail]>
> > Signed-off-by: Keqian Zhu <[e-mail]>
> > Signed-off-by: Salil Mehta <[e-mail]>
> > Reviewed-by: Jonathan Cameron <[e-mail]>
> > Reviewed-by: Gavin Shan <[e-mail]>
> > Reviewed-by: David Hildenbrand <[e-mail]>
> > Tested-by: Vishnu Pajjuri <[e-mail]>
> > Tested-by: Xianglai Li <[e-mail]>
> > ---
> >  hw/acpi/generic_event_device.c         | 8 ++++++++
> >  include/hw/acpi/generic_event_device.h | 5 +++++
> >  2 files changed, 13 insertions(+)
> >
> > diff --git a/hw/acpi/generic_event_device.c
> b/hw/acpi/generic_event_device.c
> > index a3d31631fe..d2fa1d0e4a 100644
> > --- a/hw/acpi/generic_event_device.c
> > +++ b/hw/acpi/generic_event_device.c
> > @@ -25,6 +25,7 @@ static const uint32_t ged_supported_events[] = {
> >      ACPI_GED_MEM_HOTPLUG_EVT,
> >      ACPI_GED_PWR_DOWN_EVT,
> >      ACPI_GED_NVDIMM_HOTPLUG_EVT,
> > +    ACPI_GED_CPU_HOTPLUG_EVT,
> >  };
> >
> >  /*
> > @@ -400,6 +401,13 @@ static void acpi_ged_initfn(Object *obj)
> >      memory_region_init_io(&ged_st->regs, obj, &ged_regs_ops, ged_st,
> >                            TYPE_ACPI_GED "-regs", ACPI_GED_REG_COUNT);
> >      sysbus_init_mmio(sbd, &ged_st->regs);
> > +
> > +    s->cpuhp.device = OBJECT(s);
> > +    memory_region_init(&s->container_cpuhp, OBJECT(dev), "cpuhp
> container",
> > +                       ACPI_CPU_HOTPLUG_REG_LEN);
> > +    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->container_cpuhp);
> > +    cpu_hotplug_hw_init(&s->container_cpuhp, OBJECT(dev),
> > +                        &s->cpuhp_state, 0);
> >  }
> >
> >  static void acpi_ged_class_init(ObjectClass *class, void *data)
> > diff --git a/include/hw/acpi/generic_event_device.h
> b/include/hw/acpi/generic_event_device.h
> > index ba84ce0214..a803ea818e 100644
> > --- a/include/hw/acpi/generic_event_device.h
> > +++ b/include/hw/acpi/generic_event_device.h
> > @@ -60,6 +60,7 @@
> >  #define HW_ACPI_GENERIC_EVENT_DEVICE_H
> >
> >  #include "hw/sysbus.h"
> > +#include "hw/acpi/cpu_hotplug.h"
> >  #include "hw/acpi/memory_hotplug.h"
> >  #include "hw/acpi/ghes.h"
> >  #include "qom/object.h"
> > @@ -95,6 +96,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
> >  #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
> >  #define ACPI_GED_PWR_DOWN_EVT      0x2
> >  #define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
> > +#define ACPI_GED_CPU_HOTPLUG_EVT    0x8
> >
> >  typedef struct GEDState {
> >      MemoryRegion evt;
> > @@ -106,6 +108,9 @@ struct AcpiGedState {
> >      SysBusDevice parent_obj;
> >      MemHotplugState memhp_state;
> >      MemoryRegion container_memhp;
> > +    CPUHotplugState cpuhp_state;
> > +    MemoryRegion container_cpuhp;
> > +    AcpiCpuHotplug cpuhp;
> >      GEDState ged_state;
> >      uint32_t ged_event_bitmap;
> >      qemu_irq irq;
> 
> 
> --
> Alex Bennée
> Virtualisation Tech Lead @ Linaro

Igor Mammedov Oct. 27, 2023, 2:08 p.m. UTC | #3

On Fri, 13 Oct 2023 11:51:24 +0100
Salil Mehta <[e-mail]> wrote:

> ACPI GED(as described in the ACPI 6.2 spec) can be used to generate ACPI events
> when OSPM/guest receives an interrupt listed in the _CRS object of GED. OSPM
> then maps or demultiplexes the event by evaluating _EVT method.
> 
> This change adds the support of CPU hotplug event initialization in the
> existing GED framework.
> 
> Co-developed-by: Keqian Zhu <[e-mail]>
> Signed-off-by: Keqian Zhu <[e-mail]>
> Signed-off-by: Salil Mehta <[e-mail]>
> Reviewed-by: Jonathan Cameron <[e-mail]>
> Reviewed-by: Gavin Shan <[e-mail]>
> Reviewed-by: David Hildenbrand <[e-mail]>
> Tested-by: Vishnu Pajjuri <[e-mail]>
> Tested-by: Xianglai Li <[e-mail]>
> ---
>  hw/acpi/generic_event_device.c         | 8 ++++++++
>  include/hw/acpi/generic_event_device.h | 5 +++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> index a3d31631fe..d2fa1d0e4a 100644
> --- a/hw/acpi/generic_event_device.c
> +++ b/hw/acpi/generic_event_device.c
> @@ -25,6 +25,7 @@ static const uint32_t ged_supported_events[] = {
>      ACPI_GED_MEM_HOTPLUG_EVT,
>      ACPI_GED_PWR_DOWN_EVT,
>      ACPI_GED_NVDIMM_HOTPLUG_EVT,
> +    ACPI_GED_CPU_HOTPLUG_EVT,
>  };
>  
>  /*
> @@ -400,6 +401,13 @@ static void acpi_ged_initfn(Object *obj)
>      memory_region_init_io(&ged_st->regs, obj, &ged_regs_ops, ged_st,
>                            TYPE_ACPI_GED "-regs", ACPI_GED_REG_COUNT);
>      sysbus_init_mmio(sbd, &ged_st->regs);
> +
> +    s->cpuhp.device = OBJECT(s);
ain't OBJECT(s) == OBJECT(dev)m


> +    memory_region_init(&s->container_cpuhp, OBJECT(dev), "cpuhp container",
> +                       ACPI_CPU_HOTPLUG_REG_LEN);
> +    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->container_cpuhp);
> +    cpu_hotplug_hw_init(&s->container_cpuhp, OBJECT(dev),
> +                        &s->cpuhp_state, 0);

we really should refactor GED to initfn/realizefn pattern.
then at create_acpi_ged() one would enable cpu_hotplug event
and later realizefs would call cpu_hotplug_hw_init() if event is enabled.

>  }
>  
>  static void acpi_ged_class_init(ObjectClass *class, void *data)
> diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h
> index ba84ce0214..a803ea818e 100644
> --- a/include/hw/acpi/generic_event_device.h
> +++ b/include/hw/acpi/generic_event_device.h
> @@ -60,6 +60,7 @@
>  #define HW_ACPI_GENERIC_EVENT_DEVICE_H
>  
>  #include "hw/sysbus.h"
> +#include "hw/acpi/cpu_hotplug.h"
>  #include "hw/acpi/memory_hotplug.h"
>  #include "hw/acpi/ghes.h"
>  #include "qom/object.h"
> @@ -95,6 +96,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
>  #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
>  #define ACPI_GED_PWR_DOWN_EVT      0x2
>  #define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
> +#define ACPI_GED_CPU_HOTPLUG_EVT    0x8
>  
>  typedef struct GEDState {
>      MemoryRegion evt;
> @@ -106,6 +108,9 @@ struct AcpiGedState {
>      SysBusDevice parent_obj;
>      MemHotplugState memhp_state;
>      MemoryRegion container_memhp;
> +    CPUHotplugState cpuhp_state;
> +    MemoryRegion container_cpuhp;
> +    AcpiCpuHotplug cpuhp;

how about merging CPUHotplugState and AcpiCpuHotplug
and isolating AcpiCpuHotplug::sts to x86 legacy hotplug code only?

then you won't have to pull in 2 states (one of which includes
GPE specific array that's not applicable to GED)

>      GEDState ged_state;
>      uint32_t ged_event_bitmap;
>      qemu_irq irq;

Salil Mehta Nov. 13, 2023, 5:36 p.m. UTC | #4

Hi Igor,
Sorry, I realized I missed to reply this review comment.

> From: Igor Mammedov <[e-mail]>
> Sent: Friday, October 27, 2023 3:08 PM
> To: Salil Mehta <[e-mail]>
> 
> On Fri, 13 Oct 2023 11:51:24 +0100
> Salil Mehta <[e-mail]> wrote:
> 
> > ACPI GED(as described in the ACPI 6.2 spec) can be used to generate ACPI events
> > when OSPM/guest receives an interrupt listed in the _CRS object of GED. OSPM
> > then maps or demultiplexes the event by evaluating _EVT method.
> >
> > This change adds the support of CPU hotplug event initialization in the
> > existing GED framework.
> >
> > Co-developed-by: Keqian Zhu <[e-mail]>
> > Signed-off-by: Keqian Zhu <[e-mail]>
> > Signed-off-by: Salil Mehta <[e-mail]>
> > Reviewed-by: Jonathan Cameron <[e-mail]>
> > Reviewed-by: Gavin Shan <[e-mail]>
> > Reviewed-by: David Hildenbrand <[e-mail]>
> > Tested-by: Vishnu Pajjuri <[e-mail]>
> > Tested-by: Xianglai Li <[e-mail]>
> > ---
> >  hw/acpi/generic_event_device.c         | 8 ++++++++
> >  include/hw/acpi/generic_event_device.h | 5 +++++
> >  2 files changed, 13 insertions(+)
> >
> > diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> > index a3d31631fe..d2fa1d0e4a 100644
> > --- a/hw/acpi/generic_event_device.c
> > +++ b/hw/acpi/generic_event_device.c
> > @@ -25,6 +25,7 @@ static const uint32_t ged_supported_events[] = {
> >      ACPI_GED_MEM_HOTPLUG_EVT,
> >      ACPI_GED_PWR_DOWN_EVT,
> >      ACPI_GED_NVDIMM_HOTPLUG_EVT,
> > +    ACPI_GED_CPU_HOTPLUG_EVT,
> >  };
> >
> >  /*
> > @@ -400,6 +401,13 @@ static void acpi_ged_initfn(Object *obj)
> >      memory_region_init_io(&ged_st->regs, obj, &ged_regs_ops, ged_st,
> >                            TYPE_ACPI_GED "-regs", ACPI_GED_REG_COUNT);
> >      sysbus_init_mmio(sbd, &ged_st->regs);
> > +
> > +    s->cpuhp.device = OBJECT(s);
> ain't OBJECT(s) == OBJECT(dev)m


Thanks for pointing. And going deeper to looks this is *stray* and
surprisingly has been lurking since I first floated the RFC V1
in Jun 2020. Sorry I missed it in earlier context although David
did point to this.

Salil.


> > +    memory_region_init(&s->container_cpuhp, OBJECT(dev), "cpuhp
> container",
> > +                       ACPI_CPU_HOTPLUG_REG_LEN);
> > +    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->container_cpuhp);
> > +    cpu_hotplug_hw_init(&s->container_cpuhp, OBJECT(dev),
> > +                        &s->cpuhp_state, 0);
> 
> we really should refactor GED to initfn/realizefn pattern.
> then at create_acpi_ged() one would enable cpu_hotplug event
> and later realizefs would call cpu_hotplug_hw_init() if event is enabled.


Maybe. Why not instance_init() ?


> >  }
> >
> >  static void acpi_ged_class_init(ObjectClass *class, void *data)
> > diff --git a/include/hw/acpi/generic_event_device.h
> b/include/hw/acpi/generic_event_device.h
> > index ba84ce0214..a803ea818e 100644
> > --- a/include/hw/acpi/generic_event_device.h
> > +++ b/include/hw/acpi/generic_event_device.h
> > @@ -60,6 +60,7 @@
> >  #define HW_ACPI_GENERIC_EVENT_DEVICE_H
> >
> >  #include "hw/sysbus.h"
> > +#include "hw/acpi/cpu_hotplug.h"
> >  #include "hw/acpi/memory_hotplug.h"
> >  #include "hw/acpi/ghes.h"
> >  #include "qom/object.h"
> > @@ -95,6 +96,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
> >  #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
> >  #define ACPI_GED_PWR_DOWN_EVT      0x2
> >  #define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
> > +#define ACPI_GED_CPU_HOTPLUG_EVT    0x8
> >
> >  typedef struct GEDState {
> >      MemoryRegion evt;
> > @@ -106,6 +108,9 @@ struct AcpiGedState {
> >      SysBusDevice parent_obj;
> >      MemHotplugState memhp_state;
> >      MemoryRegion container_memhp;
> > +    CPUHotplugState cpuhp_state;
> > +    MemoryRegion container_cpuhp;
> > +    AcpiCpuHotplug cpuhp;
> 
> how about merging CPUHotplugState and AcpiCpuHotplug
> and isolating AcpiCpuHotplug::sts to x86 legacy hotplug code only?
> 
> then you won't have to pull in 2 states (one of which includes
> GPE specific array that's not applicable to GED)

To be frank, I do not remember the context what I was trying to do
4 years back. But above looks stray and will remove it.


Thanks
Salil.

Patch

diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index a3d31631fe..d2fa1d0e4a 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -25,6 +25,7 @@  static const uint32_t ged_supported_events[] = {
     ACPI_GED_MEM_HOTPLUG_EVT,
     ACPI_GED_PWR_DOWN_EVT,
     ACPI_GED_NVDIMM_HOTPLUG_EVT,
+    ACPI_GED_CPU_HOTPLUG_EVT,
 };
 
 /*
@@ -400,6 +401,13 @@  static void acpi_ged_initfn(Object *obj)
     memory_region_init_io(&ged_st->regs, obj, &ged_regs_ops, ged_st,
                           TYPE_ACPI_GED "-regs", ACPI_GED_REG_COUNT);
     sysbus_init_mmio(sbd, &ged_st->regs);
+
+    s->cpuhp.device = OBJECT(s);
+    memory_region_init(&s->container_cpuhp, OBJECT(dev), "cpuhp container",
+                       ACPI_CPU_HOTPLUG_REG_LEN);
+    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->container_cpuhp);
+    cpu_hotplug_hw_init(&s->container_cpuhp, OBJECT(dev),
+                        &s->cpuhp_state, 0);
 }
 
 static void acpi_ged_class_init(ObjectClass *class, void *data)
diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h
index ba84ce0214..a803ea818e 100644
--- a/include/hw/acpi/generic_event_device.h
+++ b/include/hw/acpi/generic_event_device.h
@@ -60,6 +60,7 @@ 
 #define HW_ACPI_GENERIC_EVENT_DEVICE_H
 
 #include "hw/sysbus.h"
+#include "hw/acpi/cpu_hotplug.h"
 #include "hw/acpi/memory_hotplug.h"
 #include "hw/acpi/ghes.h"
 #include "qom/object.h"
@@ -95,6 +96,7 @@  OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
 #define ACPI_GED_MEM_HOTPLUG_EVT   0x1
 #define ACPI_GED_PWR_DOWN_EVT      0x2
 #define ACPI_GED_NVDIMM_HOTPLUG_EVT 0x4
+#define ACPI_GED_CPU_HOTPLUG_EVT    0x8
 
 typedef struct GEDState {
     MemoryRegion evt;
@@ -106,6 +108,9 @@  struct AcpiGedState {
     SysBusDevice parent_obj;
     MemHotplugState memhp_state;
     MemoryRegion container_memhp;
+    CPUHotplugState cpuhp_state;
+    MemoryRegion container_cpuhp;
+    AcpiCpuHotplug cpuhp;
     GEDState ged_state;
     uint32_t ged_event_bitmap;
     qemu_irq irq;