From bc85aae4204509420f0a4403ca728801170d9351 Mon Sep 17 00:00:00 2001 From: Haoqian He Date: Tue, 15 Apr 2025 22:47:28 -0400 Subject: vhost-user: return failure if backend crash when live migration Live migration should be terminated if the vhost-user backend crashes before the migration completes. Specifically, since the vhost device will be stopped when VM is stopped before the end of the live migration, in current implementation if the backend crashes, vhost-user device set_status() won't return failure, live migration won't perceive the disconnection between QEMU and the backend. When the VM is migrated to the destination, the inflight IO will be resubmitted, and if the IO was completed out of order before, it will cause IO error. To fix this issue: 1. Add the return value to set_status() for VirtioDeviceClass. a. For the vhost-user device, return failure when the backend crashes. b. For other virtio devices, always return 0. 2. Return failure if vhost_dev_stop() failed for vhost-user device. If QEMU loses connection with the vhost-user backend, virtio set_status() can return failure to the upper layer, migration_completion() can handle the error, terminate the live migration, and restore the VM, so that inflight IO can be completed normally. Signed-off-by: Haoqian He Message-Id: <20250416024729.3289157-4-haoqian.he@smartx.com> Tested-by: Lei Yang Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/net/virtio-net.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'hw/net/virtio-net.c') diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 2de037c273..221252e00a 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -382,7 +382,7 @@ static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) } } -static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) +static int virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) { VirtIONet *n = VIRTIO_NET(vdev); VirtIONetQueue *q; @@ -437,6 +437,7 @@ static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) } } } + return 0; } static void virtio_net_set_link_status(NetClientState *nc) -- cgit 1.4.1