[PATCH v8 1/9] virtio: introduce macro IRTIO_CONFIG_IRQ_IDX

[Cindy Lu <lulu@redhat.com>]

In order to support configure interrupt for vhost-vdpa
introduce VIRTIO_CONFIG_IRQ_IDX -1 as a queue index,
then we can reuse the function guest_notifier_mask and
guest_notifier_pending.
we add the check of queue index, if the driver
is not support configure interrupt, the function will just return

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/display/vhost-user-gpu.c    |  6 ++++++
 hw/net/virtio-net.c            | 10 +++++++---
 hw/virtio/vhost-user-fs.c      |  9 +++++++--
 hw/virtio/vhost-vsock-common.c |  6 ++++++
 hw/virtio/virtio-crypto.c      |  6 ++++++
 include/hw/virtio/virtio.h     |  2 ++
 6 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index 6cdaa1c73b..c232d55986 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -483,6 +483,9 @@ vhost_user_gpu_guest_notifier_pending(VirtIODevice *vdev, int idx)
 {
     VhostUserGPU *g = VHOST_USER_GPU(vdev);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return false;
+    }
     return vhost_virtqueue_pending(&g->vhost->dev, idx);
 }
 
@@ -491,6 +494,9 @@ vhost_user_gpu_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask)
 {
     VhostUserGPU *g = VHOST_USER_GPU(vdev);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return;
+    }
     vhost_virtqueue_mask(&g->vhost->dev, vdev, idx, mask);
 }
 
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 66b9ff4511..f50235b5d6 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3052,7 +3052,10 @@ static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
     VirtIONet *n = VIRTIO_NET(vdev);
     NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
     assert(n->vhost_started);
-    return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
+    if (idx != VIRTIO_CONFIG_IRQ_IDX) {
+        return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
+    }
+    return false;
 }
 
 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
@@ -3061,8 +3064,9 @@ static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
     VirtIONet *n = VIRTIO_NET(vdev);
     NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
     assert(n->vhost_started);
-    vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
-                             vdev, idx, mask);
+    if (idx != VIRTIO_CONFIG_IRQ_IDX) {
+        vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask);
+    }
 }
 
 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
index 6f7f91533d..7e8ca25f71 100644
--- a/hw/virtio/vhost-user-fs.c
+++ b/hw/virtio/vhost-user-fs.c
@@ -156,11 +156,13 @@ static void vuf_handle_output(VirtIODevice *vdev, VirtQueue *vq)
      */
 }
 
-static void vuf_guest_notifier_mask(VirtIODevice *vdev, int idx,
-                                            bool mask)
+static void vuf_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask)
 {
     VHostUserFS *fs = VHOST_USER_FS(vdev);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return;
+    }
     vhost_virtqueue_mask(&fs->vhost_dev, vdev, idx, mask);
 }
 
@@ -168,6 +170,9 @@ static bool vuf_guest_notifier_pending(VirtIODevice *vdev, int idx)
 {
     VHostUserFS *fs = VHOST_USER_FS(vdev);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return false;
+    }
     return vhost_virtqueue_pending(&fs->vhost_dev, idx);
 }
 
diff --git a/hw/virtio/vhost-vsock-common.c b/hw/virtio/vhost-vsock-common.c
index 4ad6e234ad..2112b44802 100644
--- a/hw/virtio/vhost-vsock-common.c
+++ b/hw/virtio/vhost-vsock-common.c
@@ -101,6 +101,9 @@ static void vhost_vsock_common_guest_notifier_mask(VirtIODevice *vdev, int idx,
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return;
+    }
     vhost_virtqueue_mask(&vvc->vhost_dev, vdev, idx, mask);
 }
 
@@ -109,6 +112,9 @@ static bool vhost_vsock_common_guest_notifier_pending(VirtIODevice *vdev,
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return false;
+    }
     return vhost_virtqueue_pending(&vvc->vhost_dev, idx);
 }
 
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index 54f9bbb789..1d5192f8b4 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -948,6 +948,9 @@ static void virtio_crypto_guest_notifier_mask(VirtIODevice *vdev, int idx,
 
     assert(vcrypto->vhost_started);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return;
+    }
     cryptodev_vhost_virtqueue_mask(vdev, queue, idx, mask);
 }
 
@@ -958,6 +961,9 @@ static bool virtio_crypto_guest_notifier_pending(VirtIODevice *vdev, int idx)
 
     assert(vcrypto->vhost_started);
 
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return false;
+    }
     return cryptodev_vhost_virtqueue_pending(vdev, queue, idx);
 }
 
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index b7ece7a6a8..63cb9455ed 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -67,6 +67,8 @@ typedef struct VirtQueueElement
 
 #define VIRTIO_NO_VECTOR 0xffff
 
+#define VIRTIO_CONFIG_IRQ_IDX -1
+
 #define TYPE_VIRTIO_DEVICE "virtio-device"
 OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE)
 
-- 
2.21.3