virtio-mmio: add support for configure interrupt

Add configure interrupt support for virtio-mmio bus. This
interrupt will be working while the backend is vhost-vdpa

Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20211104164827.21911-10-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index 72da12f..8091320 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -673,7 +673,30 @@ static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
 
     return 0;
 }
+static int virtio_mmio_set_config_guest_notifier(DeviceState *d, bool assign)
+{
+    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
+    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
+    bool with_irqfd = false;
+    EventNotifier *notifier = virtio_config_get_guest_notifier(vdev);
+    int r = 0;
 
+    if (assign) {
+        r = event_notifier_init(notifier, 0);
+        if (r < 0) {
+            return r;
+        }
+        virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
+    } else {
+        virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
+        event_notifier_cleanup(notifier);
+    }
+    if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
+        vdc->guest_notifier_mask(vdev, VIRTIO_CONFIG_IRQ_IDX, !assign);
+    }
+    return r;
+}
 static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
                                            bool assign)
 {
@@ -695,6 +718,10 @@ static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
             goto assign_error;
         }
     }
+    r = virtio_mmio_set_config_guest_notifier(d, assign);
+    if (r < 0) {
+        goto assign_error;
+    }
 
     return 0;