Add a reset notify function that enables to start the propagation of
interrupts to the guest.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
v10 -> v11:
- comment reword
v8 -> v9:
- handle failure in vfio_irq_starter
---
hw/vfio/platform.c | 64 +++++++++++++++++++++++++++++++++++++++++
include/hw/vfio/vfio-platform.h | 8 ++++++
2 files changed, 72 insertions(+)
diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index 31c2701..361e01b 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -572,6 +572,70 @@ static void vfio_platform_realize(DeviceState *dev, Error **errp)
}
}
+/**
+ * vfio_irq_starter: Start IRQ forwarding for a specific VFIO device
+ * @sbdev: Sysbus device handle
+ * @opaque: DeviceState handle of the interrupt controller the device
+ * is attached to
+ *
+ * The function retrieves the absolute GSI number each VFIO IRQ
+ * corresponds to and start forwarding.
+ */
+static int vfio_irq_starter(SysBusDevice *sbdev, void *opaque)
+{
+ DeviceState *intc = (DeviceState *)opaque;
+ VFIOPlatformDevice *vdev;
+ VFIOINTp *intp;
+ qemu_irq irq;
+ int gsi, ret;
+
+ if (object_dynamic_cast(OBJECT(sbdev), TYPE_VFIO_PLATFORM)) {
+ vdev = VFIO_PLATFORM_DEVICE(sbdev);
+
+ QLIST_FOREACH(intp, &vdev->intp_list, next) {
+ gsi = 0;
+ while (1) {
+ irq = qdev_get_gpio_in(intc, gsi);
+ if (irq == intp->qemuirq) {
+ break;
+ }
+ gsi++;
+ }
+ intp->virtualID = gsi;
+ ret = vdev->start_irq_fn(intp);
+ if (ret) {
+ error_report("%s unable to start propagation of IRQ index %d",
+ vdev->vbasedev.name, intp->pin);
+ exit(1);
+ }
+ }
+ }
+ return 0;
+}
+
+/**
+ * vfio_kick_irqs: start IRQ forwarding for all the VFIO devices
+ * attached to the platform bus
+ * @data: Device state handle of the interrupt controller the VFIO IRQs
+ * must be bound to
+ *
+ * Binding to the platform bus IRQs happens on a machine init done
+ * notifier registered by the platform bus. Only at that time the
+ * absolute virtual IRQ = GSI is known and allows to setup IRQFD.
+ * This function typically can be called in a reset notifier registered
+ * by the machine file.
+ */
+void vfio_kick_irqs(void *data)
+{
+ DeviceState *intc = (DeviceState *)data;
+ DeviceState *dev =
+ qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
+ PlatformBusDevice *pbus = PLATFORM_BUS_DEVICE(dev);
+
+ assert(pbus->done_gathering);
+ foreach_dynamic_sysbus_device(vfio_irq_starter, intc);
+}
+
static const VMStateDescription vfio_platform_vmstate = {
.name = TYPE_VFIO_PLATFORM,
.unmigratable = 1,
diff --git a/include/hw/vfio/vfio-platform.h b/include/hw/vfio/vfio-platform.h
index 31893a3..c9ee898 100644
--- a/include/hw/vfio/vfio-platform.h
+++ b/include/hw/vfio/vfio-platform.h
@@ -77,4 +77,12 @@ typedef struct VFIOPlatformDeviceClass {
#define VFIO_PLATFORM_DEVICE_GET_CLASS(obj) \
OBJECT_GET_CLASS(VFIOPlatformDeviceClass, (obj), TYPE_VFIO_PLATFORM)
+/**
+ * vfio_kick_irqs - reset notifier that starts IRQ injection
+ * for all VFIO dynamic sysbus devices attached to the platform bus.
+ *
+ * @opaque: handle to the interrupt controller DeviceState
+ */
+void vfio_kick_irqs(void *opaque);
+
#endif /*HW_VFIO_VFIO_PLATFORM_H*/
--
1.8.3.2
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