Bug 2108531

Description of problem:
Win2022 (ovmf) guest reboot after migration with wsl2 installed inside
1.Easy to reproduce bug: 
Installed wsl2 in win2022 guest. Boot win2022 guest with vtpm devides, then start postcopy migration, after postcopy migration completed, win2022 guest would reboot automatically.
2.When reproduce bug following 1 scenario, then retest, boot win2022 without vtpm device, do plain migration, after migration, win2022 guest would reboot too. But it's hard to reproduce this bug when try with 2 scenario.


Version-Release number of selected component (if applicable):
hosts info: kernel-5.14.0-121.el9.x86_64 & qemu-kvm-7.0.0-8.el9.x86_64
cpu model: Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz
guest info: win2022 ovmf guest


How reproducible:
1. Easy to reproduce with wsl2 installed and vtpm device in Win2022 guest, postcopy migration
2. Hard to reproduce with wsl2 installed but without vtpm device in Win2022 guest, plain migration


Steps to Reproduce:
1.Setup tpm on source and destination hosts;
# rm -rf /tmp/mytpm && mkdir /tmp/mytpm
# /usr/bin/swtpm_setup --tpm2 --tpmstate /tmp/mytpm --create-ek-cert --create-platform-cert --overwrite
# /usr/bin/swtpm socket --daemon --ctrl type=unixio,path=/tmp/guest-swtpm.sock,mode=0600 --tpmstate dir=/tmp/mytpm,mode=0600 --tpm2
2.Boot a guest on source host with qemu command [1];
3.Boot a guest on destination host with same qemu command as source host but appending with "-incoming defer"
4.Enable postcopy capability on source and destination host;
5.Start migration, during migration is active, switch to postcopy mode;


Actual results:
After postcopy migration completed, win2022 guest would reboot automatically


Expected results:
win2022 guest works well after postcopy migration, won't reboot


Additional info:
1. without wsl2 installed, didn't reproduce this bug with testing several times
2. For wsl2 install in win2022 guest, refer to https://docs.microsoft.com/en-us/windows/wsl/install-on-server

Qemu command [1]:
/usr/libexec/qemu-kvm  \
-name "mouse-vm" \
-sandbox on \
-machine q35,memory-backend=pc.ram,pflash0=drive_ovmf_code,pflash1=drive_ovmf_vars \
-cpu Cascadelake-Server-v5,ss=on,vmx=on,pdcm=on,hypervisor=on,tsc-adjust=on,umip=on,pku=on,md-clear=on,stibp=on,arch-capabilities=on,xsaves=on,ibpb=on,ibrs=on,amd-stibp=on,amd-ssbd=on,rdctl-no=on,ibrs-all=on,skip-l1dfl-vmentry=on,mds-no=on,pschange-mc-no=on,tsx-ctrl=on,hle=off,rtm=off,hv_stimer,hv_synic,hv_vpindex,hv_relaxed,hv_spinlocks=0xfff,hv_crash,hv_vapic,hv_time,hv_frequencies,hv_runtime,hv_tlbflush,hv_reenlightenment,hv_stimer_direct,hv_ipi,hv_evmcs \
-nodefaults  \
-chardev socket,id=qmp_id_qmpmonitor1,path=/var/tmp/monitor-qmpmonitor1,server=on,wait=off \
-chardev socket,id=qmp_id_catch_monitor,path=/var/tmp/monitor-catch_monitor,server=on,wait=off \
-chardev socket,id=chrtpm,path=/tmp/guest-swtpm.sock \
-mon chardev=qmp_id_qmpmonitor1,mode=control \
-mon chardev=qmp_id_catch_monitor,mode=control \
-device pcie-root-port,port=0x10,chassis=1,id=root0,bus=pcie.0,multifunction=on,addr=0x2 \
-device pcie-root-port,port=0x11,chassis=2,id=root1,bus=pcie.0,addr=0x2.0x1 \
-device pcie-root-port,port=0x12,chassis=3,id=root2,bus=pcie.0,addr=0x2.0x2 \
-device pcie-root-port,port=0x13,chassis=4,id=root3,bus=pcie.0,addr=0x2.0x3 \
-device pcie-root-port,port=0x14,chassis=5,id=root4,bus=pcie.0,addr=0x2.0x4 \
-device pcie-root-port,port=0x15,chassis=6,id=root5,bus=pcie.0,addr=0x2.0x5 \
-device pcie-root-port,port=0x16,chassis=7,id=root6,bus=pcie.0,addr=0x2.0x6 \
-device pcie-root-port,port=0x17,chassis=8,id=root7,bus=pcie.0,addr=0x2.0x7 \
-device pcie-root-port,port=0x20,chassis=21,id=extra_root0,bus=pcie.0,multifunction=on,addr=0x3 \
-device pcie-root-port,port=0x21,chassis=22,id=extra_root1,bus=pcie.0,addr=0x3.0x1 \
-device pcie-root-port,port=0x22,chassis=23,id=extra_root2,bus=pcie.0,addr=0x3.0x2 \
-device nec-usb-xhci,id=usb1,bus=root0,addr=0x0 \
-device virtio-scsi-pci,id=virtio_scsi_pci0,bus=root1,addr=0x0 \
-device scsi-hd,id=image1,drive=drive_image1,bus=virtio_scsi_pci0.0,channel=0,scsi-id=0,lun=0,bootindex=0,write-cache=on \
-device virtio-net-pci,mac=9a:8a:8b:8c:8d:8e,id=net0,netdev=tap0,bus=root2,addr=0x0 \
-device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
-device virtio-balloon-pci,id=balloon0,bus=root3,addr=0x0 \
-device VGA,id=video0,vgamem_mb=16,bus=pcie.0,addr=0x1 \
-device tpm-crb,tpmdev=tpm-tpm0,id=tpm0 \
-blockdev driver=file,auto-read-only=on,discard=unmap,aio=threads,cache.direct=on,cache.no-flush=off,filename=/mnt/xiaohli/win2022.qcow2,node-name=drive_sys1 \
-blockdev driver=qcow2,node-name=drive_image1,read-only=off,cache.direct=on,cache.no-flush=off,file=drive_sys1 \
-blockdev node-name=file_ovmf_code,driver=file,filename=/usr/share/OVMF/OVMF_CODE.secboot.fd,auto-read-only=on,discard=unmap \
-blockdev node-name=drive_ovmf_code,driver=raw,read-only=on,file=file_ovmf_code \
-blockdev node-name=file_ovmf_vars,driver=file,filename=/mnt/xiaohli/win2022-64-virtio-scsi.qcow2_VARS.fd,auto-read-only=on,discard=unmap \
-blockdev node-name=drive_ovmf_vars,driver=raw,read-only=off,file=file_ovmf_vars \
-netdev tap,id=tap0,vhost=on \
-m 4096 \
-object memory-backend-ram,id=pc.ram,size=4096M \
-smp 4,maxcpus=4,cores=2,threads=1,sockets=2 \
-vnc :10 \
-rtc base=utc,clock=host \
-boot menu=off,strict=off,order=cdn,once=c \
-enable-kvm  \
-qmp tcp:0:3333,server=on,wait=off \
-qmp tcp:0:9999,server=on,wait=off \
-qmp tcp:0:9888,server=on,wait=off \
-serial tcp:0:4444,server=on,wait=off \
-monitor stdio \
-msg timestamp=on \
-tpmdev emulator,id=tpm-tpm0,chardev=chrtpm \