[PATCH 07/20] virtio: add notifier support

["Michael S. Tsirkin" <mst@xxxxxxxxxx>]

Add binding API to set host/guest notifiers.
Will be used by vhost.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
 hw/virtio.c |   13 ++++++++++---
 hw/virtio.h |    5 ++++-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/hw/virtio.c b/hw/virtio.c
index 7c020a3..b9411e9 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -592,6 +592,12 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
     return &vdev->vq[i];
 }
 
+void virtio_irq(VirtIODevice *vdev, VirtQueue *vq)
+{
+    vdev->isr |= 0x01;
+    virtio_notify_vector(vdev, vq->vector);
+}
+
 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
 {
     /* Always notify when queue is empty (when feature acknowledge) */
@@ -600,8 +606,7 @@ void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
          (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx)))
         return;
 
-    vdev->isr |= 0x01;
-    virtio_notify_vector(vdev, vq->vector);
+    virtio_irq(vdev, vq);
 }
 
 void virtio_notify_config(VirtIODevice *vdev)
@@ -714,8 +719,10 @@ VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
     vdev->queue_sel = 0;
     vdev->config_vector = VIRTIO_NO_VECTOR;
     vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
-    for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++)
+    for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
         vdev->vq[i].vector = VIRTIO_NO_VECTOR;
+        vdev->vq[i].vdev = vdev;
+    }
 
     vdev->name = name;
     vdev->config_len = config_size;
diff --git a/hw/virtio.h b/hw/virtio.h
index 62e882b..2c298a8 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -18,6 +18,7 @@
 #include "net.h"
 #include "qdev.h"
 #include "sysemu.h"
+#include "notifier.h"
 
 /* from Linux's linux/virtio_config.h */
 
@@ -88,6 +89,8 @@ typedef struct {
     int (*load_config)(void * opaque, QEMUFile *f);
     int (*load_queue)(void * opaque, int n, QEMUFile *f);
     unsigned (*get_features)(void * opaque);
+    int (*guest_notifier)(void * opaque, int n, bool assigned);
+    int (*host_notifier)(void * opaque, int n, bool assigned);
 } VirtIOBindings;
 
 #define VIRTIO_PCI_QUEUE_MAX 64
@@ -180,5 +183,5 @@ void virtio_net_exit(VirtIODevice *vdev);
 	DEFINE_PROP_BIT("indirect_desc", _state, _field, \
 			VIRTIO_RING_F_INDIRECT_DESC, true)
 
-
+void virtio_irq(VirtIODevice *vdev, VirtQueue *vq);
 #endif
-- 
1.6.6.144.g5c3af

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