[PULL 04/10] Revert "vhost: add support for configure interrupt"

["Michael S. Tsirkin" <mst@redhat.com>]

This reverts commit f7220a7ce21604a4bc6260ccca4dc9068c1f27f2.
---
 include/hw/virtio/vhost.h |  4 ---
 hw/virtio/vhost.c         | 76 ---------------------------------------
 2 files changed, 80 deletions(-)

diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index b0f3b78987..58a73e7b7a 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -29,7 +29,6 @@ struct vhost_virtqueue {
     unsigned long long used_phys;
     unsigned used_size;
     EventNotifier masked_notifier;
-    EventNotifier masked_config_notifier;
     struct vhost_dev *dev;
 };
 
@@ -38,7 +37,6 @@ typedef unsigned long vhost_log_chunk_t;
 #define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
 #define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
 #define VHOST_INVALID_FEATURE_BIT   (0xff)
-#define VHOST_QUEUE_NUM_CONFIG_INR 0
 
 struct vhost_log {
     unsigned long long size;
@@ -118,8 +116,6 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
-bool vhost_config_pending(struct vhost_dev *hdev);
-void vhost_config_mask(struct vhost_dev *hdev, VirtIODevice *vdev, bool mask);
 
 /* Test and clear masked event pending status.
  * Should be called after unmask to avoid losing events.
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index cbf3b792da..7b03efccec 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1554,67 +1554,6 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
     }
 }
 
-bool vhost_config_pending(struct vhost_dev *hdev)
-{
-    assert(hdev->vhost_ops);
-    if ((hdev->started == false) ||
-        (hdev->vhost_ops->vhost_set_config_call == NULL)) {
-        return false;
-    }
-
-    EventNotifier *notifier =
-        &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier;
-    return event_notifier_test_and_clear(notifier);
-}
-
-void vhost_config_mask(struct vhost_dev *hdev, VirtIODevice *vdev, bool mask)
-{
-    int fd;
-    int r;
-    EventNotifier *notifier =
-        &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier;
-    EventNotifier *config_notifier = &vdev->config_notifier;
-    assert(hdev->vhost_ops);
-
-    if ((hdev->started == false) ||
-        (hdev->vhost_ops->vhost_set_config_call == NULL)) {
-        return;
-    }
-    if (mask) {
-        assert(vdev->use_guest_notifier_mask);
-        fd = event_notifier_get_fd(notifier);
-    } else {
-        fd = event_notifier_get_fd(config_notifier);
-    }
-    r = hdev->vhost_ops->vhost_set_config_call(hdev, fd);
-    if (r < 0) {
-        VHOST_OPS_DEBUG(r, "vhost_set_config_call failed");
-    }
-}
-
-static void vhost_stop_config_intr(struct vhost_dev *dev)
-{
-    int fd = -1;
-    assert(dev->vhost_ops);
-    if (dev->vhost_ops->vhost_set_config_call) {
-        dev->vhost_ops->vhost_set_config_call(dev, fd);
-    }
-}
-
-static void vhost_start_config_intr(struct vhost_dev *dev)
-{
-    int r;
-
-    assert(dev->vhost_ops);
-    int fd = event_notifier_get_fd(&dev->vdev->config_notifier);
-    if (dev->vhost_ops->vhost_set_config_call) {
-        r = dev->vhost_ops->vhost_set_config_call(dev, fd);
-        if (!r) {
-            event_notifier_set(&dev->vdev->config_notifier);
-        }
-    }
-}
-
 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
                             uint64_t features)
 {
@@ -1827,16 +1766,6 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
         }
     }
 
-    r = event_notifier_init(
-        &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier, 0);
-    if (r < 0) {
-        return r;
-    }
-    event_notifier_test_and_clear(
-        &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);
-    if (!vdev->use_guest_notifier_mask) {
-        vhost_config_mask(hdev, vdev, true);
-    }
     if (hdev->log_enabled) {
         uint64_t log_base;
 
@@ -1869,7 +1798,6 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
             vhost_device_iotlb_miss(hdev, vq->used_phys, true);
         }
     }
-    vhost_start_config_intr(hdev);
     return 0;
 fail_log:
     vhost_log_put(hdev, false);
@@ -1895,9 +1823,6 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
 
     /* should only be called after backend is connected */
     assert(hdev->vhost_ops);
-    event_notifier_test_and_clear(
-        &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);
-    event_notifier_test_and_clear(&vdev->config_notifier);
 
     if (hdev->vhost_ops->vhost_dev_start) {
         hdev->vhost_ops->vhost_dev_start(hdev, false);
@@ -1915,7 +1840,6 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
         }
         memory_listener_unregister(&hdev->iommu_listener);
     }
-    vhost_stop_config_intr(hdev);
     vhost_log_put(hdev, true);
     hdev->started = false;
     hdev->vdev = NULL;
-- 
MST