qemu-4.1.0-88.oe2003sp4 针对qcow2类型虚拟机，在线跨主机迁移异常

**【缺陷描述】：qemu-4.1.0-88.oe2003sp4 针对qcow2类型虚拟机，在线跨主机迁移异常，libvirt日志报错磁盘（vda）input/output error，相同环境不做任何调整，将qemu降级到qemu-4.1.0-83.oe2003sp4，即可以跨主机在线迁移了

**一、缺陷信息**

**【缺陷所属的os版本】：openEuler-20.03-LTS SP4

**【内核版本】：4.19.90-2411.4.0.0304

**【缺陷所属软件及版本号】：qemu-4.1.0-88.oe2003sp4.x86_64.rpm

**【环境信息】**
硬件信息

- intel x86架构的物理品牌机必现，在多套环境复现了该问题
- 在intel x86架构的嵌套虚拟化场景里面是偶现

软件信息

- 软件降级时将qemu-img、qemu-block-iscsi、qemu-block-rbd、qemu-block-curl一并降级了，其它软件及配置没有任何变化

网络信息

- 无

**【问题复现步骤】：
1.先在一台宿主机virsh create创建并运行虚拟机，虚拟机qcow2文件就存放于某个目录(比如：/opt)
2.在线跨主机迁移前准备工作：在目标主机的某个目录创建qcow2文件，然后virsh dumpxml将源虚拟机xml导出至“/etc/libvirt/qemu/”并将“source file=”替换为目标存储路径。
3.执行命令跨主机迁移：virsh migrate --live --p2p --unsafe --copy-storage-all 7ade710f-ad87-400e-bef4-e8a892157e7c  qemu+tcp://目标IP/system tcp://目标IP --xml /etc/libvirt/qemu/7ade710f-ad87-400e-bef4-e8a892157e7c.xml
4.执行上述命令会报错，如下：  
error: internal error: qemu unexpectedly closed the monitor: qmp_cmd_name: migrate-set-parameters, arguments: {"tls-creds": "", "tls-hostname": ""}
qmp_cmd_name: nbd-server-start, arguments: {"addr": {"type": "inet", "data": {"port": "49153", "host": "::"}}}
qmp_cmd_name: nbd-server-add, arguments: {"device": "drive-virtio-disk0", "writable": true}
qmp_cmd_name: migrate-incoming, arguments: {"uri": "tcp:[::]:49152"}
{"timestamp": {"seconds": 1739775431, "microseconds": 710949}, "event": "MIGRATION", "data": {"status": "setup"}}
qmp_cmd_name: query-block, arguments: {}

5.停止虚拟机，将源和目标qemu、qemu-img、qemu-block-iscsi、qemu-block-rbd、qemu-block-curl一并降级至4.1.0-83
6.再启动虚拟机，执行命令迁移，无异常。

**【其他相关附件信息】**
    libvirt.log中报错信息如下：

2025-02-14T09:58:06.941517Z qemu-kvm: Disconnect client, due to: Failed to read request: Unexpected end-of-file before all bytes were read
2025-02-14 09:59:22.353+0000: 3496: error : qemuMigrationNBDReportMirrorError:488 : operation failed: migration of disk vda failed: Input/output error
2025-02-14 09:59:22.739+0000: 3496: error : virNetClientProgramDispatchError:172 : internal error: qemu unexpectedly closed the monitor: qmp_cmd_name: migrate-set-parameters, arguments: {"tls-creds": "", "tls-hostname": ""}
qmp_cmd_name: nbd-server-start, arguments: {"addr": {"type": "inet", "data": {"port": "49153", "host": "::"}}}
qmp_cmd_name: nbd-server-add, arguments: {"device": "drive-virtio-disk0", "writable": true}
qmp_cmd_name: migrate-incoming, arguments: {"uri": "tcp:[::]:49152"}
{"timestamp": {"seconds": 1739527162, "microseconds": 277054}, "event": "MIGRATION", "data": {"status": "setup"}}
qmp_cmd_name: query-block, arguments: {}
2025-02-14T09:59:22.335427Z qemu-kvm: Disconnect client, due to: Failed to read request: Unexpected end-of-file before all bytes were read
2025-02-17 02:58:26.724+0000: 3498: error : qemuMigrationNBDReportMirrorError:488 : operation failed: migration of disk vda failed: Input/output error
2025-02-17 02:58:27.107+0000: 3498: error : virNetClientProgramDispatchError:172 : internal error: qemu unexpectedly closed the monitor: qmp_cmd_name: migrate-set-parameters, arguments: {"tls-creds": "", "tls-hostname": ""}
qmp_cmd_name: nbd-server-start, arguments: {"addr": {"type": "inet", "data": {"port": "49153", "host": "::"}}}
qmp_cmd_name: nbd-server-add, arguments: {"device": "drive-virtio-disk0", "writable": true}
qmp_cmd_name: migrate-incoming, arguments: {"uri": "tcp:[::]:49152"}
{"timestamp": {"seconds": 1739761106, "microseconds": 632089}, "event": "MIGRATION", "data": {"status": "setup"}}
qmp_cmd_name: query-block, arguments: {}
2025-02-17T02:58:26.691413Z qemu-kvm: Disconnect client, due to: Failed to read request: Unexpected end-of-file before all bytes were read

**【缺陷详情及分析指导参考链接】**
无

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