scsi-hd驱动热拔出中间磁盘之后，无法迁移

**【缺陷描述】：scsi-hd驱动热拔出中间磁盘之后，无法迁移**

**一、缺陷信息**

**【缺陷所属的os版本】openEuler 22.03 (LTS-SP1)**

**【内核版本】5.10.0-136.82.0.163.oe2203sp1.x86_64**

**【缺陷所属软件及版本号】qemu-6.2.0-100.oe2203sp1.rpm qemu-8.2.0-12.x86_64.rpm  **
https://gitee.com/openeuler/qemu/tree/qemu-8.2.0/
https://gitee.com/openeuler/qemu/tree/qemu-6.2.0/

**【环境信息】**
硬件信息（不影响）

- 提供跟硬件相关的信息，如架构、cpu和内存规格等
- 虚拟机场景，额外补充宿主机os版本类型

软件信息

- 跟缺陷所属软件相关的其它软件版本信息
# gcc --version
gcc (GCC) 10.3.1
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

**【问题复现步骤】：请描述具体的操作步骤**
 **1、启动虚拟机A**  
/usr/libexec/qemu-kvm \
-enable-kvm -cpu host \
-monitor stdio \
-m 16384 \
-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 \
-device virtio-scsi-pci,id=scsi,bus=pci.0,addr=0x07 \
-drive file=rbd:rbdpool/openEuler2203sp1.raw,if=none,format=raw,discard=unmap,detect-zeroes=unmap,cache=none,id=drive_0 \
-device scsi-hd,drive=drive_0,bus=scsi.0,id=drive_0 \
-drive file=rbd:rbdpool/test-1g.raw,if=none,format=raw,discard=unmap,detect-zeroes=unmap,cache=none,id=drive_1 \
-device scsi-hd,drive=drive_1,bus=scsi.0,id=drive_1 \
-drive file=rbd:rbdpool/test-2g.raw,if=none,format=raw,discard=unmap,detect-zeroes=unmap,cache=none,id=drive_2 \
-device scsi-hd,drive=drive_2,bus=scsi.0,id=drive_2 \
-vnc 0.0.0.0:3091

(qemu) info block
drive_0 (#block181): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "openEuler2203sp1.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_0
    Cache mode:       writeback, direct
    Detect zeroes:    unmap

drive_1 (#block383): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "test-1g.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_1
    Cache mode:       writeback, direct
    Detect zeroes:    unmap

drive_2 (#block539): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "test-2g.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_2
    Cache mode:       writeback, direct
    Detect zeroes:    unmap
![启动成功](https://foruda.gitee.com/images/1740728264473285554/56cab382_10294596.png "屏幕截图")

**2、热拔出中间磁盘drive_1  test-1g.raw** 
(qemu) device_del drive_1

(qemu) info block
drive_0 (#block181): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "openEuler2203sp1.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_0
    Cache mode:       writeback, direct
    Detect zeroes:    unmap

drive_2 (#block539): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "test-2g.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_2
    Cache mode:       writeback, direct
    Detect zeroes:    unmap
![成功拔出1g测试盘](https://foruda.gitee.com/images/1740728423936306760/ad0f390b_10294596.png "屏幕截图")

**3、虚拟机迁移 启动目的端虚拟机B命令行中不包含 1g测试盘** 
/usr/libexec/qemu-kvm \
-enable-kvm -cpu host \
-monitor stdio \
-m 16384 \
-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 \
-device virtio-scsi-pci,id=scsi,bus=pci.0,addr=0x07 \
-drive file=rbd:rbdpool/openEuler2203sp1.raw,if=none,format=raw,discard=unmap,detect-zeroes=unmap,cache=none,id=drive_0 \
-device scsi-hd,drive=drive_0,bus=scsi.0,id=drive_0 \
-drive file=rbd:rbdpool/test-2g.raw,if=none,format=raw,discard=unmap,detect-zeroes=unmap,cache=none,id=drive_2 \
-device scsi-hd,drive=drive_2,bus=scsi.0,id=drive_2 \
-vnc 0.0.0.0:3091 \
-incoming tcp:0:4444

(qemu) info block
drive_0 (#block174): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "openEuler2203sp1.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_0
    Cache mode:       writeback, direct
    Detect zeroes:    unmap

drive_2 (#block394): json:{"driver": "raw", "file": {"pool": "rbdpool", "image": "test-2g.raw", "driver": "rbd"}} (raw)
    Attached to:      drive_2
    Cache mode:       writeback, direct
    Detect zeroes:    unmap

**4、虚拟机迁移 A--->B** 
(qemu) migrate -d tcp:B虚拟机ip:4444

**【实际结果】**，请描述出问题的结果和影响
迁移成功

**【期望结果】**，请描述出期望的结果和影响
迁移失败
报错：
(qemu) qemu-kvm: Unknown savevm section or instance '0000:00:07.0/0:2:0/scsi-disk' 0. Make sure that your current VM setup matches your saved VM setup, including any hotplugged devices

**【缺陷参考】**
scsi-hd驱动磁盘，热插拔之后不能自动排序结构体，导致磁盘缺失无法迁移，virtio-blk-pci驱动磁盘不会出现此问题

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