add patch fixing fd leak for vhost

Each pause+resume operation (which is also done as part of taking a VM
snapshot) would increase the number of open file descriptors by the
number of vhost devices (e.g. network devices by default). This could
lead to crashes during backup and surely other issues once the system
limit (default 1024) was reached [0].

[0]: https://forum.proxmox.com/threads/131603/

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

debian/patches/extra/0011-vhost-fix-the-fd-leak.patch

@@ -0,0 +1,29 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Li Feng <fengli@smartx.com>
+Date: Mon, 31 Jul 2023 20:10:06 +0800
+Subject: [PATCH] vhost: fix the fd leak
+
+When the vhost-user reconnect to the backend, the notifer should be
+cleanup. Otherwise, the fd resource will be exhausted.
+
+Fixes: f9a09ca3ea ("vhost: add support for configure interrupt")
+
+Signed-off-by: Li Feng <fengli@smartx.com>
+Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
+---
+ hw/virtio/vhost.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
+index a266396576..8e3311781f 100644
+--- a/hw/virtio/vhost.c
++++ b/hw/virtio/vhost.c
+@@ -2034,6 +2034,8 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
+     event_notifier_test_and_clear(
+         &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);
+     event_notifier_test_and_clear(&vdev->config_notifier);
++    event_notifier_cleanup(
++        &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);
+ 
+     trace_vhost_dev_stop(hdev, vdev->name, vrings);
+ 

debian/patches/series

@@ -8,6 +8,7 @@ extra/0007-bcm2835_property-disable-reentrancy-detection-for-io.patch
 extra/0008-raven-disable-reentrancy-detection-for-iomem.patch
 extra/0009-apic-disable-reentrancy-detection-for-apic-msi.patch
 extra/0010-migration-block-dirty-bitmap-fix-loading-bitmap-when.patch
+extra/0011-vhost-fix-the-fd-leak.patch
 bitmap-mirror/0001-drive-mirror-add-support-for-sync-bitmap-mode-never.patch
 bitmap-mirror/0002-drive-mirror-add-support-for-conditional-and-always-.patch
 bitmap-mirror/0003-mirror-add-check-for-bitmap-mode-without-bitmap.patch