From 28df1417d3ff982298b9068327d3a908d3974249 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Mon, 16 Nov 2015 14:33:22 +0100
Subject: [PATCH 38/44] vhost: send SET_VRING_ENABLE at start/stop
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Message-id: <1447684235-15638-32-git-send-email-mst@redhat.com>
Patchwork-id: 68375
O-Subject: [PATCH RHEV 7.3/7.2.z v2 31/36] vhost: send SET_VRING_ENABLE at start/stop
Bugzilla: 1279388
RH-Acked-by: Xiao Wang <jasowang@redhat.com>
RH-Acked-by: Victor Kaplansky <vkaplans@redhat.com>
RH-Acked-by: Marcel Apfelbaum <marcel@redhat.com>
RH-Acked-by: Marc-André Lureau <mlureau@redhat.com>
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Send SET_VRING_ENABLE at start/stop, to give the backend
an explicit sign of our state.
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry-picked from commit 3a12f32229a046f4d4ab0a3a52fb01d2d5a1ab76)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
hw/virtio/vhost.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 200ec45..7cfb2e0 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1194,6 +1194,11 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
}
}
+ if (hdev->vhost_ops->vhost_backend_set_vring_enable) {
+ /* only enable first vq pair by default */
+ hdev->vhost_ops->vhost_backend_set_vring_enable(hdev, hdev->vq_index == 0);
+ }
+
return 0;
fail_log:
if (hdev->log_size) {
@@ -1226,6 +1231,10 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
hdev->vq_index + i);
}
+ if (hdev->vhost_ops->vhost_backend_set_vring_enable) {
+ hdev->vhost_ops->vhost_backend_set_vring_enable(hdev, 0);
+ }
+
vhost_log_put(hdev, true);
hdev->started = false;
hdev->log = NULL;
--
1.8.3.1