diff --git a/aio-posix.c b/aio-posix.c
index d477033..56f2bce 100644
--- a/aio-posix.c
+++ b/aio-posix.c
@@ -43,6 +43,7 @@ static AioHandler *find_aio_handler(AioContext *ctx, int fd)
 
 void aio_set_fd_handler(AioContext *ctx,
                         int fd,
+                        int type,
                         IOHandler *io_read,
                         IOHandler *io_write,
                         void *opaque)
@@ -92,10 +93,11 @@ void aio_set_fd_handler(AioContext *ctx,
 
 void aio_set_event_notifier(AioContext *ctx,
                             EventNotifier *notifier,
+                            int type,
                             EventNotifierHandler *io_read)
 {
     aio_set_fd_handler(ctx, event_notifier_get_fd(notifier),
-                       (IOHandler *)io_read, NULL, notifier);
+                       type, (IOHandler *)io_read, NULL, notifier);
 }
 
 bool aio_prepare(AioContext *ctx)
diff --git a/aio-win32.c b/aio-win32.c
index 50a6867..90e7a4b 100644
--- a/aio-win32.c
+++ b/aio-win32.c
@@ -33,6 +33,7 @@ struct AioHandler {
 
 void aio_set_fd_handler(AioContext *ctx,
                         int fd,
+                        int type,
                         IOHandler *io_read,
                         IOHandler *io_write,
                         void *opaque)
@@ -98,6 +99,7 @@ void aio_set_fd_handler(AioContext *ctx,
 
 void aio_set_event_notifier(AioContext *ctx,
                             EventNotifier *e,
+                            int type,
                             EventNotifierHandler *io_notify)
 {
     AioHandler *node;
diff --git a/async.c b/async.c
index efce14b..244bf79 100644
--- a/async.c
+++ b/async.c
@@ -247,7 +247,7 @@ aio_ctx_finalize(GSource     *source)
     }
     qemu_mutex_unlock(&ctx->bh_lock);
 
-    aio_set_event_notifier(ctx, &ctx->notifier, NULL);
+    aio_set_event_notifier(ctx, &ctx->notifier, AIO_CLIENT_UNSPECIFIED, NULL);
     event_notifier_cleanup(&ctx->notifier);
     rfifolock_destroy(&ctx->lock);
     qemu_mutex_destroy(&ctx->bh_lock);
@@ -329,6 +329,7 @@ AioContext *aio_context_new(Error **errp)
     }
     g_source_set_can_recurse(&ctx->source, true);
     aio_set_event_notifier(ctx, &ctx->notifier,
+                           AIO_CLIENT_UNSPECIFIED,
                            (EventNotifierHandler *)
                            event_notifier_dummy_cb);
     ctx->thread_pool = NULL;
diff --git a/block/curl.c b/block/curl.c
index 032cc8a..6925672 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -154,18 +154,20 @@ static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
     switch (action) {
         case CURL_POLL_IN:
-            aio_set_fd_handler(s->aio_context, fd, curl_multi_read,
-                               NULL, state);
+            aio_set_fd_handler(s->aio_context, fd, AIO_CLIENT_UNSPECIFIED,
+                               curl_multi_read, NULL, state);
             break;
         case CURL_POLL_OUT:
-            aio_set_fd_handler(s->aio_context, fd, NULL, curl_multi_do, state);
+            aio_set_fd_handler(s->aio_context, fd, AIO_CLIENT_UNSPECIFIED,
+                               NULL, curl_multi_do, state);
             break;
         case CURL_POLL_INOUT:
-            aio_set_fd_handler(s->aio_context, fd, curl_multi_read,
-                               curl_multi_do, state);
+            aio_set_fd_handler(s->aio_context, fd, AIO_CLIENT_UNSPECIFIED,
+                               curl_multi_read, curl_multi_do, state);
             break;
         case CURL_POLL_REMOVE:
-            aio_set_fd_handler(s->aio_context, fd, NULL, NULL, NULL);
+            aio_set_fd_handler(s->aio_context, fd, AIO_CLIENT_UNSPECIFIED,
+                               NULL, NULL, NULL);
             break;
     }
 
diff --git a/block/iscsi.c b/block/iscsi.c
index 93f1ee4..dcb578a 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -291,8 +291,8 @@ iscsi_set_events(IscsiLun *iscsilun)
     int ev = iscsi_which_events(iscsi);
 
     if (ev != iscsilun->events) {
-        aio_set_fd_handler(iscsilun->aio_context,
-                           iscsi_get_fd(iscsi),
+        aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
+                           AIO_CLIENT_UNSPECIFIED,
                            (ev & POLLIN) ? iscsi_process_read : NULL,
                            (ev & POLLOUT) ? iscsi_process_write : NULL,
                            iscsilun);
@@ -1280,9 +1280,8 @@ static void iscsi_detach_aio_context(BlockDriverState *bs)
 {
     IscsiLun *iscsilun = bs->opaque;
 
-    aio_set_fd_handler(iscsilun->aio_context,
-                       iscsi_get_fd(iscsilun->iscsi),
-                       NULL, NULL, NULL);
+    aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
+                       AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
     iscsilun->events = 0;
 
     if (iscsilun->nop_timer) {
diff --git a/block/linux-aio.c b/block/linux-aio.c
index c991443..0921bde 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -287,7 +287,7 @@ void laio_detach_aio_context(void *s_, AioContext *old_context)
 {
     struct qemu_laio_state *s = s_;
 
-    aio_set_event_notifier(old_context, &s->e, NULL);
+    aio_set_event_notifier(old_context, &s->e, AIO_CLIENT_UNSPECIFIED, NULL);
     qemu_bh_delete(s->completion_bh);
 }
 
@@ -296,7 +296,8 @@ void laio_attach_aio_context(void *s_, AioContext *new_context)
     struct qemu_laio_state *s = s_;
 
     s->completion_bh = aio_bh_new(new_context, qemu_laio_completion_bh, s);
-    aio_set_event_notifier(new_context, &s->e, qemu_laio_completion_cb);
+    aio_set_event_notifier(new_context, &s->e, AIO_CLIENT_UNSPECIFIED,
+                           qemu_laio_completion_cb);
 }
 
 void *laio_init(void)
diff --git a/block/nbd-client.c b/block/nbd-client.c
index e1bb919..36c46c5 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -124,7 +124,7 @@ static int nbd_co_send_request(BlockDriverState *bs,
     s->send_coroutine = qemu_coroutine_self();
     aio_context = bdrv_get_aio_context(bs);
 
-    aio_set_fd_handler(aio_context, s->sock,
+    aio_set_fd_handler(aio_context, s->sock, AIO_CLIENT_UNSPECIFIED,
                        nbd_reply_ready, nbd_restart_write, bs);
     if (qiov) {
         if (!s->is_unix) {
@@ -144,7 +144,8 @@ static int nbd_co_send_request(BlockDriverState *bs,
     } else {
         rc = nbd_send_request(s->sock, request);
     }
-    aio_set_fd_handler(aio_context, s->sock, nbd_reply_ready, NULL, bs);
+    aio_set_fd_handler(aio_context, s->sock, AIO_CLIENT_UNSPECIFIED,
+                       nbd_reply_ready, NULL, bs);
     s->send_coroutine = NULL;
     qemu_co_mutex_unlock(&s->send_mutex);
     return rc;
@@ -348,14 +349,15 @@ int nbd_client_co_discard(BlockDriverState *bs, int64_t sector_num,
 void nbd_client_detach_aio_context(BlockDriverState *bs)
 {
     aio_set_fd_handler(bdrv_get_aio_context(bs),
-                       nbd_get_client_session(bs)->sock, NULL, NULL, NULL);
+                       nbd_get_client_session(bs)->sock,
+                       AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
 }
 
 void nbd_client_attach_aio_context(BlockDriverState *bs,
                                    AioContext *new_context)
 {
     aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sock,
-                       nbd_reply_ready, NULL, bs);
+                       AIO_CLIENT_UNSPECIFIED, nbd_reply_ready, NULL, bs);
 }
 
 void nbd_client_close(BlockDriverState *bs)
diff --git a/block/nfs.c b/block/nfs.c
index 887a98e..57a5555 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -63,11 +63,10 @@ static void nfs_set_events(NFSClient *client)
 {
     int ev = nfs_which_events(client->context);
     if (ev != client->events) {
-        aio_set_fd_handler(client->aio_context,
-                           nfs_get_fd(client->context),
+        aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
+                           AIO_CLIENT_UNSPECIFIED,
                            (ev & POLLIN) ? nfs_process_read : NULL,
-                           (ev & POLLOUT) ? nfs_process_write : NULL,
-                           client);
+                           (ev & POLLOUT) ? nfs_process_write : NULL, client);
 
     }
     client->events = ev;
@@ -242,9 +241,8 @@ static void nfs_detach_aio_context(BlockDriverState *bs)
 {
     NFSClient *client = bs->opaque;
 
-    aio_set_fd_handler(client->aio_context,
-                       nfs_get_fd(client->context),
-                       NULL, NULL, NULL);
+    aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
+                       AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
     client->events = 0;
 }
 
@@ -263,9 +261,8 @@ static void nfs_client_close(NFSClient *client)
         if (client->fh) {
             nfs_close(client->context, client->fh);
         }
-        aio_set_fd_handler(client->aio_context,
-                           nfs_get_fd(client->context),
-                           NULL, NULL, NULL);
+        aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
+                           AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
         nfs_destroy_context(client->context);
     }
     memset(client, 0, sizeof(NFSClient));
diff --git a/block/sheepdog.c b/block/sheepdog.c
index e7e58b7..e31d091 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -651,14 +651,16 @@ static coroutine_fn void do_co_req(void *opaque)
     unsigned int *rlen = srco->rlen;
 
     co = qemu_coroutine_self();
-    aio_set_fd_handler(srco->aio_context, sockfd, NULL, restart_co_req, co);
+    aio_set_fd_handler(srco->aio_context, sockfd, AIO_CLIENT_UNSPECIFIED,
+                       NULL, restart_co_req, co);
 
     ret = send_co_req(sockfd, hdr, data, wlen);
     if (ret < 0) {
         goto out;
     }
 
-    aio_set_fd_handler(srco->aio_context, sockfd, restart_co_req, NULL, co);
+    aio_set_fd_handler(srco->aio_context, sockfd, AIO_CLIENT_UNSPECIFIED,
+                       restart_co_req, NULL, co);
 
     ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
     if (ret != sizeof(*hdr)) {
@@ -683,7 +685,8 @@ static coroutine_fn void do_co_req(void *opaque)
 out:
     /* there is at most one request for this sockfd, so it is safe to
      * set each handler to NULL. */
-    aio_set_fd_handler(srco->aio_context, sockfd, NULL, NULL, NULL);
+    aio_set_fd_handler(srco->aio_context, sockfd, AIO_CLIENT_UNSPECIFIED,
+                       NULL, NULL, NULL);
 
     srco->ret = ret;
     srco->finished = true;
@@ -735,7 +738,8 @@ static coroutine_fn void reconnect_to_sdog(void *opaque)
     BDRVSheepdogState *s = opaque;
     AIOReq *aio_req, *next;
 
-    aio_set_fd_handler(s->aio_context, s->fd, NULL, NULL, NULL);
+    aio_set_fd_handler(s->aio_context, s->fd, AIO_CLIENT_UNSPECIFIED, NULL,
+                       NULL, NULL);
     close(s->fd);
     s->fd = -1;
 
@@ -938,7 +942,8 @@ static int get_sheep_fd(BDRVSheepdogState *s, Error **errp)
         return fd;
     }
 
-    aio_set_fd_handler(s->aio_context, fd, co_read_response, NULL, s);
+    aio_set_fd_handler(s->aio_context, fd, AIO_CLIENT_UNSPECIFIED,
+                       co_read_response, NULL, s);
     return fd;
 }
 
@@ -1199,7 +1204,7 @@ static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
 
     qemu_co_mutex_lock(&s->lock);
     s->co_send = qemu_coroutine_self();
-    aio_set_fd_handler(s->aio_context, s->fd,
+    aio_set_fd_handler(s->aio_context, s->fd, AIO_CLIENT_UNSPECIFIED,
                        co_read_response, co_write_request, s);
     socket_set_cork(s->fd, 1);
 
@@ -1218,7 +1223,8 @@ static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
     }
 out:
     socket_set_cork(s->fd, 0);
-    aio_set_fd_handler(s->aio_context, s->fd, co_read_response, NULL, s);
+    aio_set_fd_handler(s->aio_context, s->fd, AIO_CLIENT_UNSPECIFIED,
+                       co_read_response, NULL, s);
     s->co_send = NULL;
     qemu_co_mutex_unlock(&s->lock);
 }
@@ -1368,7 +1374,8 @@ static void sd_detach_aio_context(BlockDriverState *bs)
 {
     BDRVSheepdogState *s = bs->opaque;
 
-    aio_set_fd_handler(s->aio_context, s->fd, NULL, NULL, NULL);
+    aio_set_fd_handler(s->aio_context, s->fd, AIO_CLIENT_UNSPECIFIED, NULL,
+                       NULL, NULL);
 }
 
 static void sd_attach_aio_context(BlockDriverState *bs,
@@ -1377,7 +1384,8 @@ static void sd_attach_aio_context(BlockDriverState *bs,
     BDRVSheepdogState *s = bs->opaque;
 
     s->aio_context = new_context;
-    aio_set_fd_handler(new_context, s->fd, co_read_response, NULL, s);
+    aio_set_fd_handler(new_context, s->fd, AIO_CLIENT_UNSPECIFIED,
+                       co_read_response, NULL, s);
 }
 
 /* TODO Convert to fine grained options */
@@ -1490,7 +1498,8 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
     g_free(buf);
     return 0;
 out:
-    aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd, NULL, NULL, NULL);
+    aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd,
+                       AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
     if (s->fd >= 0) {
         closesocket(s->fd);
     }
@@ -1528,7 +1537,8 @@ static void sd_reopen_commit(BDRVReopenState *state)
     BDRVSheepdogState *s = state->bs->opaque;
 
     if (s->fd) {
-        aio_set_fd_handler(s->aio_context, s->fd, NULL, NULL, NULL);
+        aio_set_fd_handler(s->aio_context, s->fd, AIO_CLIENT_UNSPECIFIED,
+                           NULL, NULL, NULL);
         closesocket(s->fd);
     }
 
@@ -1551,7 +1561,8 @@ static void sd_reopen_abort(BDRVReopenState *state)
     }
 
     if (re_s->fd) {
-        aio_set_fd_handler(s->aio_context, re_s->fd, NULL, NULL, NULL);
+        aio_set_fd_handler(s->aio_context, re_s->fd, AIO_CLIENT_UNSPECIFIED,
+                           NULL, NULL, NULL);
         closesocket(re_s->fd);
     }
 
@@ -1935,7 +1946,8 @@ static void sd_close(BlockDriverState *bs)
         error_report("%s, %s", sd_strerror(rsp->result), s->name);
     }
 
-    aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd, NULL, NULL, NULL);
+    aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd,
+                       AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
     closesocket(s->fd);
     g_free(s->host_spec);
 }
diff --git a/block/ssh.c b/block/ssh.c
index 8d06739..a90295e 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -803,14 +803,15 @@ static coroutine_fn void set_fd_handler(BDRVSSHState *s, BlockDriverState *bs)
             rd_handler, wr_handler);
 
     aio_set_fd_handler(bdrv_get_aio_context(bs), s->sock,
-                       rd_handler, wr_handler, co);
+                       AIO_CLIENT_UNSPECIFIED, rd_handler, wr_handler, co);
 }
 
 static coroutine_fn void clear_fd_handler(BDRVSSHState *s,
                                           BlockDriverState *bs)
 {
     DPRINTF("s->sock=%d", s->sock);
-    aio_set_fd_handler(bdrv_get_aio_context(bs), s->sock, NULL, NULL, NULL);
+    aio_set_fd_handler(bdrv_get_aio_context(bs), s->sock,
+                       AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
 }
 
 /* A non-blocking call returned EAGAIN, so yield, ensuring the
diff --git a/block/win32-aio.c b/block/win32-aio.c
index 64e8682..0081886 100644
--- a/block/win32-aio.c
+++ b/block/win32-aio.c
@@ -174,7 +174,7 @@ int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
 void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
                                   AioContext *old_context)
 {
-    aio_set_event_notifier(old_context, &aio->e, NULL);
+    aio_set_event_notifier(old_context, &aio->e, AIO_CLIENT_UNSPECIFIED, NULL);
     aio->is_aio_context_attached = false;
 }
 
@@ -182,7 +182,8 @@ void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
                                   AioContext *new_context)
 {
     aio->is_aio_context_attached = true;
-    aio_set_event_notifier(new_context, &aio->e, win32_aio_completion_cb);
+    aio_set_event_notifier(new_context, &aio->e, AIO_CLIENT_UNSPECIFIED,
+                           win32_aio_completion_cb);
 }
 
 QEMUWin32AIOState *win32_aio_init(void)
diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 6106e46..dc40ba3 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -283,7 +283,8 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
 
     /* Get this show started by hooking up our callbacks */
     aio_context_acquire(s->ctx);
-    aio_set_event_notifier(s->ctx, &s->host_notifier, handle_notify);
+    aio_set_event_notifier(s->ctx, &s->host_notifier, AIO_CLIENT_UNSPECIFIED,
+                           handle_notify);
     aio_context_release(s->ctx);
     return;
 
@@ -319,7 +320,8 @@ void virtio_blk_data_plane_stop(VirtIOBlockDataPlane *s)
     aio_context_acquire(s->ctx);
 
     /* Stop notifications for new requests from guest */
-    aio_set_event_notifier(s->ctx, &s->host_notifier, NULL);
+    aio_set_event_notifier(s->ctx, &s->host_notifier, AIO_CLIENT_UNSPECIFIED,
+                           NULL);
 
     /* Drain and switch bs back to the QEMU main loop */
     blk_set_aio_context(s->conf->conf.blk, qemu_get_aio_context());
diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c
index 5575648..f7bab09 100644
--- a/hw/scsi/virtio-scsi-dataplane.c
+++ b/hw/scsi/virtio-scsi-dataplane.c
@@ -60,7 +60,8 @@ static VirtIOSCSIVring *virtio_scsi_vring_init(VirtIOSCSI *s,
     r = g_slice_new(VirtIOSCSIVring);
     r->host_notifier = *virtio_queue_get_host_notifier(vq);
     r->guest_notifier = *virtio_queue_get_guest_notifier(vq);
-    aio_set_event_notifier(s->ctx, &r->host_notifier, handler);
+    aio_set_event_notifier(s->ctx, &r->host_notifier, AIO_CLIENT_UNSPECIFIED,
+                           handler);
 
     r->parent = s;
 
@@ -71,7 +72,8 @@ static VirtIOSCSIVring *virtio_scsi_vring_init(VirtIOSCSI *s,
     return r;
 
 fail_vring:
-    aio_set_event_notifier(s->ctx, &r->host_notifier, NULL);
+    aio_set_event_notifier(s->ctx, &r->host_notifier, AIO_CLIENT_UNSPECIFIED,
+                           NULL);
     k->set_host_notifier(qbus->parent, n, false);
     g_slice_free(VirtIOSCSIVring, r);
     return NULL;
@@ -162,14 +164,17 @@ static void virtio_scsi_clear_aio(VirtIOSCSI *s)
     int i;
 
     if (s->ctrl_vring) {
-        aio_set_event_notifier(s->ctx, &s->ctrl_vring->host_notifier, NULL);
+        aio_set_event_notifier(s->ctx, &s->ctrl_vring->host_notifier,
+                               AIO_CLIENT_UNSPECIFIED, NULL);
     }
     if (s->event_vring) {
-        aio_set_event_notifier(s->ctx, &s->event_vring->host_notifier, NULL);
+        aio_set_event_notifier(s->ctx, &s->event_vring->host_notifier,
+                               AIO_CLIENT_UNSPECIFIED, NULL);
     }
     if (s->cmd_vrings) {
         for (i = 0; i < vs->conf.num_queues && s->cmd_vrings[i]; i++) {
-            aio_set_event_notifier(s->ctx, &s->cmd_vrings[i]->host_notifier, NULL);
+            aio_set_event_notifier(s->ctx, &s->cmd_vrings[i]->host_notifier,
+                                   AIO_CLIENT_UNSPECIFIED, NULL);
         }
     }
 }
@@ -290,10 +295,13 @@ void virtio_scsi_dataplane_stop(VirtIOSCSI *s)
 
     aio_context_acquire(s->ctx);
 
-    aio_set_event_notifier(s->ctx, &s->ctrl_vring->host_notifier, NULL);
-    aio_set_event_notifier(s->ctx, &s->event_vring->host_notifier, NULL);
+    aio_set_event_notifier(s->ctx, &s->ctrl_vring->host_notifier,
+                           AIO_CLIENT_UNSPECIFIED, NULL);
+    aio_set_event_notifier(s->ctx, &s->event_vring->host_notifier,
+                           AIO_CLIENT_UNSPECIFIED, NULL);
     for (i = 0; i < vs->conf.num_queues; i++) {
-        aio_set_event_notifier(s->ctx, &s->cmd_vrings[i]->host_notifier, NULL);
+        aio_set_event_notifier(s->ctx, &s->cmd_vrings[i]->host_notifier,
+                               AIO_CLIENT_UNSPECIFIED, NULL);
     }
 
     blk_drain_all(); /* ensure there are no in-flight requests */
diff --git a/include/block/aio.h b/include/block/aio.h
index 400b1b0..830a0e8 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -275,6 +275,9 @@ bool aio_pending(AioContext *ctx);
  */
 bool aio_dispatch(AioContext *ctx);
 
+#define AIO_CLIENT_UNSPECIFIED    (1 << 0)
+#define AIO_CLIENT_MASK_ALL       -1
+
 /* Progress in completing AIO work to occur.  This can issue new pending
  * aio as a result of executing I/O completion or bh callbacks.
  *
@@ -299,6 +302,7 @@ bool aio_poll(AioContext *ctx, bool blocking);
  */
 void aio_set_fd_handler(AioContext *ctx,
                         int fd,
+                        int type,
                         IOHandler *io_read,
                         IOHandler *io_write,
                         void *opaque);
@@ -312,6 +316,7 @@ void aio_set_fd_handler(AioContext *ctx,
  */
 void aio_set_event_notifier(AioContext *ctx,
                             EventNotifier *notifier,
+                            int type,
                             EventNotifierHandler *io_read);
 
 /* Return a GSource that lets the main loop poll the file descriptors attached
diff --git a/iohandler.c b/iohandler.c
index 55f8501..71bcff3 100644
--- a/iohandler.c
+++ b/iohandler.c
@@ -55,7 +55,8 @@ void qemu_set_fd_handler(int fd,
                          void *opaque)
 {
     iohandler_init();
-    aio_set_fd_handler(iohandler_ctx, fd, fd_read, fd_write, opaque);
+    aio_set_fd_handler(iohandler_ctx, fd, AIO_CLIENT_UNSPECIFIED,
+                       fd_read, fd_write, opaque);
 }
 
 /* reaping of zombies.  right now we're not passing the status to
diff --git a/nbd.c b/nbd.c
index 07240bd..16a4087 100644
--- a/nbd.c
+++ b/nbd.c
@@ -1446,6 +1446,7 @@ static void nbd_set_handlers(NBDClient *client)
 {
     if (client->exp && client->exp->ctx) {
         aio_set_fd_handler(client->exp->ctx, client->sock,
+                           AIO_CLIENT_UNSPECIFIED,
                            client->can_read ? nbd_read : NULL,
                            client->send_coroutine ? nbd_restart_write : NULL,
                            client);
@@ -1455,7 +1456,8 @@ static void nbd_set_handlers(NBDClient *client)
 static void nbd_unset_handlers(NBDClient *client)
 {
     if (client->exp && client->exp->ctx) {
-        aio_set_fd_handler(client->exp->ctx, client->sock, NULL, NULL, NULL);
+        aio_set_fd_handler(client->exp->ctx, client->sock,
+                           AIO_CLIENT_UNSPECIFIED, NULL, NULL, NULL);
     }
 }
 
diff --git a/roms/ipxe b/roms/ipxe
index 4e03af8..35c5379 160000
--- a/roms/ipxe
+++ b/roms/ipxe
@@ -1 +1 @@
-Subproject commit 4e03af8ec2d497e725566a91fd5c19dd604c18a6
+Subproject commit 35c5379760aa1fea5e38f7a78b090f92bb7813ee
diff --git a/tests/test-aio.c b/tests/test-aio.c
index 217e337..770119f 100644
--- a/tests/test-aio.c
+++ b/tests/test-aio.c
@@ -118,6 +118,12 @@ static void *test_acquire_thread(void *opaque)
     return NULL;
 }
 
+static void set_event_notifier(AioContext *ctx, EventNotifier *notifier,
+                               EventNotifierHandler *handler)
+{
+    aio_set_event_notifier(ctx, notifier, AIO_CLIENT_UNSPECIFIED, handler);
+}
+
 static void dummy_notifier_read(EventNotifier *unused)
 {
     g_assert(false); /* should never be invoked */
@@ -131,7 +137,7 @@ static void test_acquire(void)
 
     /* Dummy event notifier ensures aio_poll() will block */
     event_notifier_init(&notifier, false);
-    aio_set_event_notifier(ctx, &notifier, dummy_notifier_read);
+    set_event_notifier(ctx, &notifier, dummy_notifier_read);
     g_assert(!aio_poll(ctx, false)); /* consume aio_notify() */
 
     qemu_mutex_init(&data.start_lock);
@@ -149,7 +155,7 @@ static void test_acquire(void)
     aio_context_release(ctx);
 
     qemu_thread_join(&thread);
-    aio_set_event_notifier(ctx, &notifier, NULL);
+    set_event_notifier(ctx, &notifier, NULL);
     event_notifier_cleanup(&notifier);
 
     g_assert(data.thread_acquired);
@@ -308,11 +314,11 @@ static void test_set_event_notifier(void)
 {
     EventNotifierTestData data = { .n = 0, .active = 0 };
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
     g_assert(!aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 0);
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     g_assert(!aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 0);
     event_notifier_cleanup(&data.e);
@@ -322,7 +328,7 @@ static void test_wait_event_notifier(void)
 {
     EventNotifierTestData data = { .n = 0, .active = 1 };
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
     while (aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 0);
     g_assert_cmpint(data.active, ==, 1);
@@ -336,7 +342,7 @@ static void test_wait_event_notifier(void)
     g_assert_cmpint(data.n, ==, 1);
     g_assert_cmpint(data.active, ==, 0);
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     g_assert(!aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 1);
 
@@ -347,7 +353,7 @@ static void test_flush_event_notifier(void)
 {
     EventNotifierTestData data = { .n = 0, .active = 10, .auto_set = true };
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
     while (aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 0);
     g_assert_cmpint(data.active, ==, 10);
@@ -363,7 +369,7 @@ static void test_flush_event_notifier(void)
     g_assert_cmpint(data.active, ==, 0);
     g_assert(!aio_poll(ctx, false));
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     g_assert(!aio_poll(ctx, false));
     event_notifier_cleanup(&data.e);
 }
@@ -374,7 +380,7 @@ static void test_wait_event_notifier_noflush(void)
     EventNotifierTestData dummy = { .n = 0, .active = 1 };
 
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
 
     g_assert(!aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 0);
@@ -387,7 +393,7 @@ static void test_wait_event_notifier_noflush(void)
 
     /* An active event notifier forces aio_poll to look at EventNotifiers.  */
     event_notifier_init(&dummy.e, false);
-    aio_set_event_notifier(ctx, &dummy.e, event_ready_cb);
+    set_event_notifier(ctx, &dummy.e, event_ready_cb);
 
     event_notifier_set(&data.e);
     g_assert(aio_poll(ctx, false));
@@ -407,10 +413,10 @@ static void test_wait_event_notifier_noflush(void)
     g_assert_cmpint(dummy.n, ==, 1);
     g_assert_cmpint(dummy.active, ==, 0);
 
-    aio_set_event_notifier(ctx, &dummy.e, NULL);
+    set_event_notifier(ctx, &dummy.e, NULL);
     event_notifier_cleanup(&dummy.e);
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     g_assert(!aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 2);
 
@@ -428,7 +434,7 @@ static void test_timer_schedule(void)
      * an fd to wait on. Fixing this breaks other tests. So create a dummy one.
      */
     event_notifier_init(&e, false);
-    aio_set_event_notifier(ctx, &e, dummy_io_handler_read);
+    set_event_notifier(ctx, &e, dummy_io_handler_read);
     aio_poll(ctx, false);
 
     aio_timer_init(ctx, &data.timer, data.clock_type,
@@ -467,7 +473,7 @@ static void test_timer_schedule(void)
     g_assert(!aio_poll(ctx, false));
     g_assert_cmpint(data.n, ==, 2);
 
-    aio_set_event_notifier(ctx, &e, NULL);
+    set_event_notifier(ctx, &e, NULL);
     event_notifier_cleanup(&e);
 
     timer_del(&data.timer);
@@ -638,11 +644,11 @@ static void test_source_set_event_notifier(void)
 {
     EventNotifierTestData data = { .n = 0, .active = 0 };
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 0);
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 0);
     event_notifier_cleanup(&data.e);
@@ -652,7 +658,7 @@ static void test_source_wait_event_notifier(void)
 {
     EventNotifierTestData data = { .n = 0, .active = 1 };
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 0);
     g_assert_cmpint(data.active, ==, 1);
@@ -666,7 +672,7 @@ static void test_source_wait_event_notifier(void)
     g_assert_cmpint(data.n, ==, 1);
     g_assert_cmpint(data.active, ==, 0);
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 1);
 
@@ -677,7 +683,7 @@ static void test_source_flush_event_notifier(void)
 {
     EventNotifierTestData data = { .n = 0, .active = 10, .auto_set = true };
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 0);
     g_assert_cmpint(data.active, ==, 10);
@@ -693,7 +699,7 @@ static void test_source_flush_event_notifier(void)
     g_assert_cmpint(data.active, ==, 0);
     g_assert(!g_main_context_iteration(NULL, false));
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     while (g_main_context_iteration(NULL, false));
     event_notifier_cleanup(&data.e);
 }
@@ -704,7 +710,7 @@ static void test_source_wait_event_notifier_noflush(void)
     EventNotifierTestData dummy = { .n = 0, .active = 1 };
 
     event_notifier_init(&data.e, false);
-    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
+    set_event_notifier(ctx, &data.e, event_ready_cb);
 
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 0);
@@ -717,7 +723,7 @@ static void test_source_wait_event_notifier_noflush(void)
 
     /* An active event notifier forces aio_poll to look at EventNotifiers.  */
     event_notifier_init(&dummy.e, false);
-    aio_set_event_notifier(ctx, &dummy.e, event_ready_cb);
+    set_event_notifier(ctx, &dummy.e, event_ready_cb);
 
     event_notifier_set(&data.e);
     g_assert(g_main_context_iteration(NULL, false));
@@ -737,10 +743,10 @@ static void test_source_wait_event_notifier_noflush(void)
     g_assert_cmpint(dummy.n, ==, 1);
     g_assert_cmpint(dummy.active, ==, 0);
 
-    aio_set_event_notifier(ctx, &dummy.e, NULL);
+    set_event_notifier(ctx, &dummy.e, NULL);
     event_notifier_cleanup(&dummy.e);
 
-    aio_set_event_notifier(ctx, &data.e, NULL);
+    set_event_notifier(ctx, &data.e, NULL);
     while (g_main_context_iteration(NULL, false));
     g_assert_cmpint(data.n, ==, 2);
 
@@ -759,7 +765,7 @@ static void test_source_timer_schedule(void)
      * an fd to wait on. Fixing this breaks other tests. So create a dummy one.
      */
     event_notifier_init(&e, false);
-    aio_set_event_notifier(ctx, &e, dummy_io_handler_read);
+    set_event_notifier(ctx, &e, dummy_io_handler_read);
     do {} while (g_main_context_iteration(NULL, false));
 
     aio_timer_init(ctx, &data.timer, data.clock_type,
@@ -784,7 +790,7 @@ static void test_source_timer_schedule(void)
     g_assert_cmpint(data.n, ==, 2);
     g_assert(qemu_clock_get_ns(data.clock_type) > expiry);
 
-    aio_set_event_notifier(ctx, &e, NULL);
+    set_event_notifier(ctx, &e, NULL);
     event_notifier_cleanup(&e);
 
     timer_del(&data.timer);
