Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio: revert config interrupt changes

Lots of fallout from config interrupt changes. Author wants to rework
the patches. Let's revert quickly so others don't suffer meanwhile.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon 10 Jan 2022 21:03:44 GMT
# gpg:                using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg:                issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  Revert "virtio: introduce macro IRTIO_CONFIG_IRQ_IDX"
  Revert "virtio-pci: decouple notifier from interrupt process"
  Revert "virtio-pci: decouple the single vector from the interrupt process"
  Revert "vhost: introduce new VhostOps vhost_set_config_call"
  Revert "vhost-vdpa: add support for config interrupt"
  Revert "virtio: add support for configure interrupt"
  Revert "vhost: add support for configure interrupt"
  Revert "virtio-net: add support for configure interrupt"
  Revert "virtio-mmio: add support for configure interrupt"
  Revert "virtio-pci: add support for configure interrupt"

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

18 files changed, 83 insertions, 398 deletions

diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index d4a440e815..09818231bd 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -485,9 +485,6 @@ 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);
 }
 
@@ -496,9 +493,6 @@ 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/vhost_net-stub.c b/hw/net/vhost_net-stub.c
index 126ee35b70..89d71cfb8e 100644
--- a/hw/net/vhost_net-stub.c
+++ b/hw/net/vhost_net-stub.c
@@ -101,12 +101,3 @@ int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
 {
     return 0;
 }
-
-bool vhost_net_config_pending(VHostNetState *net)
-{
-    return false;
-}
-
-void vhost_net_config_mask(VHostNetState *net, VirtIODevice *dev, bool mask)
-{
-}
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 9c9fd0a73f..30379d2ca4 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -457,15 +457,6 @@ void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
     vhost_virtqueue_mask(&net->dev, dev, idx, mask);
 }
 
-bool vhost_net_config_pending(VHostNetState *net)
-{
-    return vhost_config_pending(&net->dev);
-}
-
-void vhost_net_config_mask(VHostNetState *net, VirtIODevice *dev, bool mask)
-{
-    vhost_config_mask(&net->dev, dev, mask);
-}
 VHostNetState *get_vhost_net(NetClientState *nc)
 {
     VHostNetState *vhost_net = 0;
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 5806a50c8d..cf8ab0f8af 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3168,9 +3168,6 @@ 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);
-    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
-        return vhost_net_config_pending(get_vhost_net(nc->peer));
-    }
     return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
 }
 
@@ -3180,11 +3177,8 @@ 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);
-    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
-        vhost_net_config_mask(get_vhost_net(nc->peer), vdev, mask);
-        return;
-    }
-    vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask);
+    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/trace-events b/hw/virtio/trace-events
index 595ce015ff..f7ad6be5fb 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -53,7 +53,6 @@ vhost_vdpa_get_features(void *dev, uint64_t features) "dev: %p features: 0x%"PRI
 vhost_vdpa_set_owner(void *dev) "dev: %p"
 vhost_vdpa_vq_get_addr(void *dev, void *vq, uint64_t desc_user_addr, uint64_t avail_user_addr, uint64_t used_user_addr) "dev: %p vq: %p desc_user_addr: 0x%"PRIx64" avail_user_addr: 0x%"PRIx64" used_user_addr: 0x%"PRIx64
 vhost_vdpa_get_iova_range(void *dev, uint64_t first, uint64_t last) "dev: %p first: 0x%"PRIx64" last: 0x%"PRIx64
-vhost_vdpa_set_config_call(void *dev, int fd)"dev: %p fd: %d"
 
 # virtio.c
 virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned out_num) "elem %p size %zd in_num %u out_num %u"
diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
index 9b0349922e..c595957983 100644
--- a/hw/virtio/vhost-user-fs.c
+++ b/hw/virtio/vhost-user-fs.c
@@ -161,9 +161,6 @@ static void vuf_guest_notifier_mask(VirtIODevice *vdev, int idx,
 {
     VHostUserFS *fs = VHOST_USER_FS(vdev);
 
-    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
-        return;
-    }
     vhost_virtqueue_mask(&fs->vhost_dev, vdev, idx, mask);
 }
 
@@ -171,9 +168,6 @@ 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-vdpa.c b/hw/virtio/vhost-vdpa.c
index ac0cb575fb..04ea43704f 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -734,12 +734,6 @@ static int vhost_vdpa_set_vring_call(struct vhost_dev *dev,
     trace_vhost_vdpa_set_vring_call(dev, file->index, file->fd);
     return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file);
 }
-static int vhost_vdpa_set_config_call(struct vhost_dev *dev,
-                                       int fd)
-{
-    trace_vhost_vdpa_set_config_call(dev, fd);
-    return vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG_CALL, &fd);
-}
 
 static int vhost_vdpa_get_features(struct vhost_dev *dev,
                                      uint64_t *features)
@@ -810,5 +804,4 @@ const VhostOps vdpa_ops = {
         .vhost_get_device_id = vhost_vdpa_get_device_id,
         .vhost_vq_get_addr = vhost_vdpa_vq_get_addr,
         .vhost_force_iommu = vhost_vdpa_force_iommu,
-        .vhost_set_config_call = vhost_vdpa_set_config_call,
 };
diff --git a/hw/virtio/vhost-vsock-common.c b/hw/virtio/vhost-vsock-common.c
index d1b9c027b6..3f3771274e 100644
--- a/hw/virtio/vhost-vsock-common.c
+++ b/hw/virtio/vhost-vsock-common.c
@@ -125,9 +125,6 @@ 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);
 }
 
@@ -136,9 +133,6 @@ 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/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;
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index 1d5192f8b4..54f9bbb789 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -948,9 +948,6 @@ 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);
 }
 
@@ -961,9 +958,6 @@ 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/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index 809132018b..72da12fea5 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -673,30 +673,7 @@ 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)
 {
@@ -718,10 +695,6 @@ 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;
 
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 98fb5493ae..750aa47ec1 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -677,6 +677,7 @@ static uint32_t virtio_read_config(PCIDevice *pci_dev,
 }
 
 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
+                                        unsigned int queue_no,
                                         unsigned int vector)
 {
     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
@@ -703,160 +704,112 @@ static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 }
 
 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
-                                 EventNotifier *n,
+                                 unsigned int queue_no,
                                  unsigned int vector)
 {
     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
+    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+    VirtQueue *vq = virtio_get_queue(vdev, queue_no);
+    EventNotifier *n = virtio_queue_get_guest_notifier(vq);
     return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
 }
 
 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
-                                      EventNotifier *n ,
+                                      unsigned int queue_no,
                                       unsigned int vector)
 {
+    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+    VirtQueue *vq = virtio_get_queue(vdev, queue_no);
+    EventNotifier *n = virtio_queue_get_guest_notifier(vq);
     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
     int ret;
 
     ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq);
     assert(ret == 0);
 }
-static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no,
-                                      EventNotifier **n, unsigned int *vector)
-{
-    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
-    VirtQueue *vq;
 
-    if (queue_no == VIRTIO_CONFIG_IRQ_IDX) {
-        *n = virtio_config_get_guest_notifier(vdev);
-        *vector = vdev->config_vector;
-    } else {
-        if (!virtio_queue_get_num(vdev, queue_no)) {
-            return -1;
-        }
-        *vector = virtio_queue_vector(vdev, queue_no);
-        vq = virtio_get_queue(vdev, queue_no);
-        *n = virtio_queue_get_guest_notifier(vq);
-    }
-    return 0;
-}
-
-static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_no)
+static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 {
-    unsigned int vector;
-    int ret;
-    EventNotifier *n;
     PCIDevice *dev = &proxy->pci_dev;
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
+    unsigned int vector;
+    int ret, queue_no;
 
-    ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
-    if (ret < 0) {
-        return ret;
-    }
-    if (vector >= msix_nr_vectors_allocated(dev)) {
-        return 0;
-    }
-    ret = kvm_virtio_pci_vq_vector_use(proxy, vector);
-    if (ret < 0) {
-        goto undo;
-    }
-    /*
-     * If guest supports masking, set up irqfd now.
-     * Otherwise, delay until unmasked in the frontend.
-     */
-    if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
-        ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
+    for (queue_no = 0; queue_no < nvqs; queue_no++) {
+        if (!virtio_queue_get_num(vdev, queue_no)) {
+            break;
+        }
+        vector = virtio_queue_vector(vdev, queue_no);
+        if (vector >= msix_nr_vectors_allocated(dev)) {
+            continue;
+        }
+        ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
         if (ret < 0) {
-            kvm_virtio_pci_vq_vector_release(proxy, vector);
             goto undo;
         }
+        /* If guest supports masking, set up irqfd now.
+         * Otherwise, delay until unmasked in the frontend.
+         */
+        if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+            ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
+            if (ret < 0) {
+                kvm_virtio_pci_vq_vector_release(proxy, vector);
+                goto undo;
+            }
+        }
     }
-
     return 0;
-undo:
 
-    vector = virtio_queue_vector(vdev, queue_no);
-    if (vector >= msix_nr_vectors_allocated(dev)) {
-        return ret;
-    }
-    if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
-        ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
-        if (ret < 0) {
-            return ret;
+undo:
+    while (--queue_no >= 0) {
+        vector = virtio_queue_vector(vdev, queue_no);
+        if (vector >= msix_nr_vectors_allocated(dev)) {
+            continue;
         }
-        kvm_virtio_pci_irqfd_release(proxy, n, vector);
-    }
-    return ret;
-}
-static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
-{
-    int queue_no;
-    int ret = 0;
-    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
-
-    for (queue_no = 0; queue_no < nvqs; queue_no++) {
-        if (!virtio_queue_get_num(vdev, queue_no)) {
-            return -1;
+        if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+            kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
         }
-        ret = kvm_virtio_pci_vector_use_one(proxy, queue_no);
+        kvm_virtio_pci_vq_vector_release(proxy, vector);
     }
     return ret;
 }
 
-static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy)
-{
-    return kvm_virtio_pci_vector_use_one(proxy, VIRTIO_CONFIG_IRQ_IDX);
-}
-
-static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy,
-                                              int queue_no)
+static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
 {
+    PCIDevice *dev = &proxy->pci_dev;
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     unsigned int vector;
-    EventNotifier *n;
-    int ret;
-    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
-    PCIDevice *dev = &proxy->pci_dev;
-
-    ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
-    if (ret < 0) {
-        return;
-    }
-    if (vector >= msix_nr_vectors_allocated(dev)) {
-        return;
-    }
-    if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
-        kvm_virtio_pci_irqfd_release(proxy, n, vector);
-    }
-    kvm_virtio_pci_vq_vector_release(proxy, vector);
-}
-
-static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
-{
     int queue_no;
-    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 
     for (queue_no = 0; queue_no < nvqs; queue_no++) {
         if (!virtio_queue_get_num(vdev, queue_no)) {
             break;
         }
-        kvm_virtio_pci_vector_release_one(proxy, queue_no);
+        vector = virtio_queue_vector(vdev, queue_no);
+        if (vector >= msix_nr_vectors_allocated(dev)) {
+            continue;
+        }
+        /* If guest supports masking, clean up irqfd now.
+         * Otherwise, it was cleaned when masked in the frontend.
+         */
+        if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+            kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
+        }
+        kvm_virtio_pci_vq_vector_release(proxy, vector);
     }
 }
 
-static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy)
-{
-    kvm_virtio_pci_vector_release_one(proxy, VIRTIO_CONFIG_IRQ_IDX);
-}
-
-static int virtio_pci_one_vector_unmask(VirtIOPCIProxy *proxy,
+static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
                                        unsigned int queue_no,
                                        unsigned int vector,
-                                       MSIMessage msg,
-                                       EventNotifier *n)
+                                       MSIMessage msg)
 {
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
+    VirtQueue *vq = virtio_get_queue(vdev, queue_no);
+    EventNotifier *n = virtio_queue_get_guest_notifier(vq);
     VirtIOIRQFD *irqfd;
     int ret = 0;
 
@@ -883,15 +836,14 @@ static int virtio_pci_one_vector_unmask(VirtIOPCIProxy *proxy,
             event_notifier_set(n);
         }
     } else {
-        ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
+        ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
     }
     return ret;
 }
 
-static void virtio_pci_one_vector_mask(VirtIOPCIProxy *proxy,
+static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
                                              unsigned int queue_no,
-                                             unsigned int vector,
-                                             EventNotifier *n)
+                                             unsigned int vector)
 {
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
@@ -902,7 +854,7 @@ static void virtio_pci_one_vector_mask(VirtIOPCIProxy *proxy,
     if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
         k->guest_notifier_mask(vdev, queue_no, true);
     } else {
-        kvm_virtio_pci_irqfd_release(proxy, n, vector);
+        kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
     }
 }
 
@@ -912,7 +864,6 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
-    EventNotifier *n;
     int ret, index, unmasked = 0;
 
     while (vq) {
@@ -921,8 +872,7 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
             break;
         }
         if (index < proxy->nvqs_with_notifiers) {
-            n = virtio_queue_get_guest_notifier(vq);
-            ret = virtio_pci_one_vector_unmask(proxy, index, vector, msg, n);
+            ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg);
             if (ret < 0) {
                 goto undo;
             }
@@ -930,24 +880,15 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
         }
         vq = virtio_vector_next_queue(vq);
     }
-    /* unmask config intr */
-    n = virtio_config_get_guest_notifier(vdev);
-    ret = virtio_pci_one_vector_unmask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector,
-                                       msg, n);
-    if (ret < 0) {
-        goto undo_config;
-    }
+
     return 0;
-undo_config:
-    n = virtio_config_get_guest_notifier(vdev);
-    virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n);
+
 undo:
     vq = virtio_vector_first_queue(vdev, vector);
     while (vq && unmasked >= 0) {
         index = virtio_get_queue_index(vq);
         if (index < proxy->nvqs_with_notifiers) {
-            n = virtio_queue_get_guest_notifier(vq);
-            virtio_pci_one_vector_mask(proxy, index, vector, n);
+            virtio_pci_vq_vector_mask(proxy, index, vector);
             --unmasked;
         }
         vq = virtio_vector_next_queue(vq);
@@ -960,22 +901,18 @@ static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
-    EventNotifier *n;
     int index;
 
     while (vq) {
         index = virtio_get_queue_index(vq);
-        n = virtio_queue_get_guest_notifier(vq);
         if (!virtio_queue_get_num(vdev, index)) {
             break;
         }
         if (index < proxy->nvqs_with_notifiers) {
-            virtio_pci_one_vector_mask(proxy, index, vector, n);
+            virtio_pci_vq_vector_mask(proxy, index, vector);
         }
         vq = virtio_vector_next_queue(vq);
     }
-    n = virtio_config_get_guest_notifier(vdev);
-    virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n);
 }
 
 static void virtio_pci_vector_poll(PCIDevice *dev,
@@ -988,17 +925,19 @@ static void virtio_pci_vector_poll(PCIDevice *dev,
     int queue_no;
     unsigned int vector;
     EventNotifier *notifier;
-    int ret;
+    VirtQueue *vq;
 
     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
-        ret = virtio_pci_get_notifier(proxy, queue_no, &notifier, &vector);
-        if (ret < 0) {
+        if (!virtio_queue_get_num(vdev, queue_no)) {
             break;
         }
+        vector = virtio_queue_vector(vdev, queue_no);
         if (vector < vector_start || vector >= vector_end ||
             !msix_is_masked(dev, vector)) {
             continue;
         }
+        vq = virtio_get_queue(vdev, queue_no);
+        notifier = virtio_queue_get_guest_notifier(vq);
         if (k->guest_notifier_pending) {
             if (k->guest_notifier_pending(vdev, queue_no)) {
                 msix_set_pending(dev, vector);
@@ -1007,34 +946,6 @@ static void virtio_pci_vector_poll(PCIDevice *dev,
             msix_set_pending(dev, vector);
         }
     }
-    /* poll the config intr */
-    ret = virtio_pci_get_notifier(proxy, VIRTIO_CONFIG_IRQ_IDX, &notifier,
-                                  &vector);
-    if (ret < 0) {
-        return;
-    }
-    if (vector < vector_start || vector >= vector_end ||
-        !msix_is_masked(dev, vector)) {
-        return;
-    }
-    if (k->guest_notifier_pending) {
-        if (k->guest_notifier_pending(vdev, VIRTIO_CONFIG_IRQ_IDX)) {
-            msix_set_pending(dev, vector);
-        }
-    } else if (event_notifier_test_and_clear(notifier)) {
-        msix_set_pending(dev, vector);
-    }
-}
-
-void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq,
-                                              int n, bool assign,
-                                              bool with_irqfd)
-{
-    if (n == VIRTIO_CONFIG_IRQ_IDX) {
-        virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
-    } else {
-        virtio_queue_set_guest_notifier_fd_handler(vq, assign, with_irqfd);
-    }
 }
 
 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
@@ -1043,25 +954,17 @@ static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
-    VirtQueue *vq = NULL;
-    EventNotifier *notifier = NULL;
-
-    if (n == VIRTIO_CONFIG_IRQ_IDX) {
-        notifier = virtio_config_get_guest_notifier(vdev);
-    } else {
-        vq = virtio_get_queue(vdev, n);
-        notifier = virtio_queue_get_guest_notifier(vq);
-    }
+    VirtQueue *vq = virtio_get_queue(vdev, n);
+    EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 
     if (assign) {
         int r = event_notifier_init(notifier, 0);
         if (r < 0) {
             return r;
         }
-        virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, true, with_irqfd);
+        virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
     } else {
-        virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, false,
-                                                 with_irqfd);
+        virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
         event_notifier_cleanup(notifier);
     }
 
@@ -1103,7 +1006,6 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
         msix_unset_vector_notifiers(&proxy->pci_dev);
         if (proxy->vector_irqfd) {
             kvm_virtio_pci_vector_release(proxy, nvqs);
-            kvm_virtio_pci_vector_config_release(proxy);
             g_free(proxy->vector_irqfd);
             proxy->vector_irqfd = NULL;
         }
@@ -1119,11 +1021,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
             goto assign_error;
         }
     }
-    r = virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, assign,
-                                      with_irqfd);
-    if (r < 0) {
-        goto config_assign_error;
-    }
+
     /* Must set vector notifier after guest notifier has been assigned */
     if ((with_irqfd || k->guest_notifier_mask) && assign) {
         if (with_irqfd) {
@@ -1132,14 +1030,11 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
                           msix_nr_vectors_allocated(&proxy->pci_dev));
             r = kvm_virtio_pci_vector_use(proxy, nvqs);
             if (r < 0) {
-                goto config_assign_error;
+                goto assign_error;
             }
         }
-        r = kvm_virtio_pci_vector_config_use(proxy);
-        if (r < 0) {
-            goto config_error;
-        }
-        r = msix_set_vector_notifiers(&proxy->pci_dev, virtio_pci_vector_unmask,
+        r = msix_set_vector_notifiers(&proxy->pci_dev,
+                                      virtio_pci_vector_unmask,
                                       virtio_pci_vector_mask,
                                       virtio_pci_vector_poll);
         if (r < 0) {
@@ -1154,11 +1049,7 @@ notifiers_error:
         assert(assign);
         kvm_virtio_pci_vector_release(proxy, nvqs);
     }
-config_error:
-    kvm_virtio_pci_vector_config_release(proxy);
-config_assign_error:
-    virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, !assign,
-                                  with_irqfd);
+
 assign_error:
     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
     assert(assign);
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index b704acc5a8..2446dcd9ae 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -251,7 +251,5 @@ void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t);
  * @fixed_queues.
  */
 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues);
-void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq,
-                                              int n, bool assign,
-                                              bool with_irqfd);
+
 #endif
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 971e59a663..5d18868d7d 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -3494,14 +3494,7 @@ static void virtio_queue_guest_notifier_read(EventNotifier *n)
         virtio_irq(vq);
     }
 }
-static void virtio_config_guest_notifier_read(EventNotifier *n)
-{
-    VirtIODevice *vdev = container_of(n, VirtIODevice, config_notifier);
 
-    if (event_notifier_test_and_clear(n)) {
-        virtio_notify_config(vdev);
-    }
-}
 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
                                                 bool with_irqfd)
 {
@@ -3518,23 +3511,6 @@ void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
     }
 }
 
-void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev,
-                                                 bool assign, bool with_irqfd)
-{
-    EventNotifier *n;
-    n = &vdev->config_notifier;
-    if (assign && !with_irqfd) {
-        event_notifier_set_handler(n, virtio_config_guest_notifier_read);
-    } else {
-        event_notifier_set_handler(n, NULL);
-    }
-    if (!assign) {
-        /* Test and clear notifier before closing it,*/
-        /* in case poll callback didn't have time to run. */
-        virtio_config_guest_notifier_read(n);
-    }
-}
-
 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq)
 {
     return &vq->guest_notifier;
@@ -3608,11 +3584,6 @@ EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq)
     return &vq->host_notifier;
 }
 
-EventNotifier *virtio_config_get_guest_notifier(VirtIODevice *vdev)
-{
-    return &vdev->config_notifier;
-}
-
 void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled)
 {
     vq->host_notifier_enabled = enabled;
diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h
index ff34eb7c8a..81bf3109f8 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -126,8 +126,6 @@ typedef int (*vhost_get_device_id_op)(struct vhost_dev *dev, uint32_t *dev_id);
 
 typedef bool (*vhost_force_iommu_op)(struct vhost_dev *dev);
 
-typedef int (*vhost_set_config_call_op)(struct vhost_dev *dev,
-                                       int fd);
 typedef struct VhostOps {
     VhostBackendType backend_type;
     vhost_backend_init vhost_backend_init;
@@ -173,7 +171,6 @@ typedef struct VhostOps {
     vhost_vq_get_addr_op  vhost_vq_get_addr;
     vhost_get_device_id_op vhost_get_device_id;
     vhost_force_iommu_op vhost_force_iommu;
-    vhost_set_config_call_op vhost_set_config_call;
 } VhostOps;
 
 int vhost_backend_update_device_iotlb(struct vhost_dev *dev,
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/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index d78088d872..8bab9cfb75 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -67,9 +67,6 @@ typedef struct VirtQueueElement
 
 #define VIRTIO_NO_VECTOR 0xffff
 
-/* special index value used internally for config irqs */
-#define VIRTIO_CONFIG_IRQ_IDX -1
-
 #define TYPE_VIRTIO_DEVICE "virtio-device"
 OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE)
 
@@ -111,7 +108,6 @@ struct VirtIODevice
     bool use_guest_notifier_mask;
     AddressSpace *dma_as;
     QLIST_HEAD(, VirtQueue) *vector_queues;
-    EventNotifier config_notifier;
 };
 
 struct VirtioDeviceClass {
@@ -314,14 +310,11 @@ uint16_t virtio_get_queue_index(VirtQueue *vq);
 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
                                                 bool with_irqfd);
-void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev,
-                                                 bool assign, bool with_irqfd);
 int virtio_device_start_ioeventfd(VirtIODevice *vdev);
 int virtio_device_grab_ioeventfd(VirtIODevice *vdev);
 void virtio_device_release_ioeventfd(VirtIODevice *vdev);
 bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev);
 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
-EventNotifier *virtio_config_get_guest_notifier(VirtIODevice *vdev);
 void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled);
 void virtio_queue_host_notifier_read(EventNotifier *n);
 void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
index fc37498550..387e913e4e 100644
--- a/include/net/vhost_net.h
+++ b/include/net/vhost_net.h
@@ -39,8 +39,6 @@ int vhost_net_set_config(struct vhost_net *net, const uint8_t *data,
 bool vhost_net_virtqueue_pending(VHostNetState *net, int n);
 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
                               int idx, bool mask);
-bool vhost_net_config_pending(VHostNetState *net);
-void vhost_net_config_mask(VHostNetState *net, VirtIODevice *dev, bool mask);
 int vhost_net_notify_migration_done(VHostNetState *net, char* mac_addr);
 VHostNetState *get_vhost_net(NetClientState *nc);