[Qemu-devel] [PATCH V15 2/5] acpi: add a vm_generation_id_changed method

[Gal Hammer <ghammer@redhat.com>]

Add a new method to the AcpiDeviceIfClass interface. The new
method send an ACPI notfication when the VM generation id is
changed.

Signed-off-by: Gal Hammer <ghammer@redhat.com>
---
 hw/acpi/core.c                       | 8 ++++++++
 hw/acpi/ich9.c                       | 8 ++++++++
 hw/acpi/piix4.c                      | 8 ++++++++
 hw/isa/lpc_ich9.c                    | 1 +
 include/hw/acpi/acpi.h               | 2 ++
 include/hw/acpi/acpi_dev_interface.h | 4 ++++
 include/hw/acpi/ich9.h               | 2 ++
 7 files changed, 33 insertions(+)

diff --git a/hw/acpi/core.c b/hw/acpi/core.c
index 51913d6..d4597c6 100644
--- a/hw/acpi/core.c
+++ b/hw/acpi/core.c
@@ -28,6 +28,8 @@
 #include "qapi-visit.h"
 #include "qapi-event.h"
 
+#define ACPI_VM_GENERATION_ID_CHANGED_STATUS 1
+
 struct acpi_table_header {
     uint16_t _length;         /* our length, not actual part of the hdr */
                               /* allows easier parsing for fw_cfg clients */
@@ -683,3 +685,9 @@ void acpi_update_sci(ACPIREGS *regs, qemu_irq irq)
                        (regs->pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
                        !(pm1a_sts & ACPI_BITMASK_TIMER_STATUS));
 }
+
+void acpi_vm_generation_id_changed(ACPIREGS *acpi_regs, qemu_irq irq)
+{
+    acpi_regs->gpe.sts[0] |= ACPI_VM_GENERATION_ID_CHANGED_STATUS;
+    acpi_update_sci(acpi_regs, irq);
+}
diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 5352e19..613b82e 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -417,3 +417,11 @@ void ich9_pm_ospm_status(AcpiDeviceIf *adev, ACPIOSTInfoList ***list)
 
     acpi_memory_ospm_status(&s->pm.acpi_memory_hotplug, list);
 }
+
+void ich9_vm_generation_id_changed(AcpiDeviceIf *adev)
+{
+    ICH9LPCState *s = ICH9_LPC_DEVICE(adev);
+    ICH9LPCPMRegs *pm = &s->pm;
+
+    acpi_vm_generation_id_changed(&pm->acpi_regs, pm->irq);
+}
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index d1f1179..4708cfc 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -580,6 +580,13 @@ static void piix4_ospm_status(AcpiDeviceIf *adev, ACPIOSTInfoList ***list)
     acpi_memory_ospm_status(&s->acpi_memory_hotplug, list);
 }
 
+static void piix4_vm_generation_id_changed(AcpiDeviceIf *adev)
+{
+    PIIX4PMState *s = PIIX4_PM(adev);
+
+    acpi_vm_generation_id_changed(&s->ar, s->irq);
+}
+
 static Property piix4_pm_properties[] = {
     DEFINE_PROP_UINT32("smb_io_base", PIIX4PMState, smb_io_base, 0),
     DEFINE_PROP_UINT8(ACPI_PM_PROP_S3_DISABLED, PIIX4PMState, disable_s3, 0),
@@ -618,6 +625,7 @@ static void piix4_pm_class_init(ObjectClass *klass, void *data)
     hc->unplug_request = piix4_device_unplug_request_cb;
     hc->unplug = piix4_device_unplug_cb;
     adevc->ospm_status = piix4_ospm_status;
+    adevc->vm_generation_id_changed = piix4_vm_generation_id_changed;
 }
 
 static const TypeInfo piix4_pm_info = {
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index dba7585..2626fd5 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -688,6 +688,7 @@ static void ich9_lpc_class_init(ObjectClass *klass, void *data)
     hc->unplug_request = ich9_device_unplug_request_cb;
     hc->unplug = ich9_device_unplug_cb;
     adevc->ospm_status = ich9_pm_ospm_status;
+    adevc->vm_generation_id_changed = ich9_vm_generation_id_changed;
 }
 
 static const TypeInfo ich9_lpc_info = {
diff --git a/include/hw/acpi/acpi.h b/include/hw/acpi/acpi.h
index 1f678b4..9373b4d 100644
--- a/include/hw/acpi/acpi.h
+++ b/include/hw/acpi/acpi.h
@@ -185,4 +185,6 @@ unsigned acpi_table_len(void *current);
 void acpi_table_add(const QemuOpts *opts, Error **errp);
 void acpi_table_add_builtin(const QemuOpts *opts, Error **errp);
 
+void acpi_vm_generation_id_changed(ACPIREGS *acpi_regs, qemu_irq irq);
+
 #endif /* !QEMU_HW_ACPI_H */
diff --git a/include/hw/acpi/acpi_dev_interface.h b/include/hw/acpi/acpi_dev_interface.h
index f245f8d..757ce60 100644
--- a/include/hw/acpi/acpi_dev_interface.h
+++ b/include/hw/acpi/acpi_dev_interface.h
@@ -28,6 +28,9 @@ typedef struct AcpiDeviceIf {
  * ospm_status: returns status of ACPI device objects, reported
  *              via _OST method if device supports it.
  *
+ * vm_generation_id_changed: notify the guest that it generation
+ *                           id was changed.
+ *
  * Interface is designed for providing unified interface
  * to generic ACPI functionality that could be used without
  * knowledge about internals of actual device that implements
@@ -39,5 +42,6 @@ typedef struct AcpiDeviceIfClass {
 
     /* <public> */
     void (*ospm_status)(AcpiDeviceIf *adev, ACPIOSTInfoList ***list);
+    void (*vm_generation_id_changed)(AcpiDeviceIf *adev);
 } AcpiDeviceIfClass;
 #endif
diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index c2d3dba..255a113 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -69,4 +69,6 @@ void ich9_pm_device_unplug_cb(ICH9LPCPMRegs *pm, DeviceState *dev,
                               Error **errp);
 
 void ich9_pm_ospm_status(AcpiDeviceIf *adev, ACPIOSTInfoList ***list);
+
+void ich9_vm_generation_id_changed(AcpiDeviceIf *adev);
 #endif /* HW_ACPI_ICH9_H */
-- 
2.1.0