Bug 1776808

Since 8.x !AV is the same code as RHEL7-rhev, clone for the same fix.

Hi Dave,
I test on the rhel8.2-Non-AV hosts(kernel-4.18.0-151.el8.x86_64&qemu-img-2.12.0-90.module+el8.2.0+4652+138f0dc3.x86_64), couldn't hit this issue.
But could reproduce bz on rhel 7.8 hosts(kernel-3.10.0-1111.el7.x86_64&qemu-kvm-rhev-2.12.0-38.el7.x86_64) using same commands as below:
**********************************
/usr/libexec/qemu-kvm  \
-name "mouse-vm" \
-machine q35 \
-cpu Haswell,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff \
-m 8G \
-smp 8 \
-nodefaults  \
-device VGA \
-device pcie-root-port,id=root0,slot=0,addr=0x3 \
-device pcie-root-port,id=root1,slot=1,addr=0x4 \
-device pcie-root-port,id=root2,slot=2,addr=0x5 \
-device virtio-scsi-pci,id=virtio_scsi_pci0,bus=root1 \
-device scsi-hd,id=image1,drive=drive_image1,bus=virtio_scsi_pci0.0,channel=0,scsi-id=0,lun=0,bootindex=0 \
-device virtio-net-pci,mac=9a:8a:8b:8c:8d:8e,id=net0,vectors=4,netdev=tap0,bus=root2,mq=on \
-blockdev driver=file,cache.direct=on,cache.no-flush=off,filename=/mnt/nfs/win10-64-virtio-scsi-tm1120.qcow2,node-name=drive_sys1 \
-blockdev driver=qcow2,node-name=drive_image1,file=drive_sys1 \
-netdev tap,id=tap0,vhost=on,queues=3 \
-vnc :10 \
-rtc base=utc,clock=host \
-boot menu=off,strict=off,order=cdn,once=c \
-enable-kvm  \
-qmp tcp:0:3333,server,nowait \
-serial tcp:0:4444,server,nowait \
-monitor stdio \

test on same rhel8.2-non-AV hosts with qemu-img-2.12.0-91.module+el8.2.0+4916+02633b66.x86_64, didn't reproduce.

Ok, I can reproduce bz on qemu-img-2.12.0-91.module+el8.2.0+4916+02633b66.x86_64 with "-smp 2 -netdev tap,id=tap0,vhost=on,queues=3 \ -device virtio-net-pci,mac=9a:8a:8b:8c:8d:8e,id=net0,vectors=4,netdev=tap0,bus=root2,mq=on"

differ from clone bz 1775251(always reproduce with mq=on&queues=$num), it didn't always reproduce on rhel8.2-non-av, so here do migration by running 100 times base_test_common script with mq=on&queues=$num in command line. 
Will check the result after finishing running.

Ok, found the right reproduction on rhel8.2 hosts: 
1) always hit this issue to start migration when the win guest is starting(just the moment that guest is starting the NIC up)
2) couldn't reproduce bz to start migration after guest has started.

Run base_test_common_win script with mq=on&queues=3:
1)on qemu-kvm-2.12.0-91.module+el8.2.0+4916+02633b66.x86_64, after tried 3 times, all failed with qemu core dump;
2)on qemu-img-2.12.0-92.module+el8.2.0+5014+5115d99d.x86_64, run 30 times, all Pass:
**********************************************************************************************
RESULTS [RHEL7-47114-WIN-Q35-BLOCKDEV]:
==>TOTAL : 30
==>PASS : 30 
   1: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
   2: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
   3: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
   4: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
  ...
   28: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
   29: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
   30: BASE-TEST-COMMON-WIN-Migration basic precopy test without setting downtime and speed (1 min 40 sec)
==>ERROR : 0 
==>RUN TIME : 40 min 3 sec 
==>TEST LOG : /home/ipa/test_logs/rhel7_47114_win_q35_blockdev-2019-12-12-04:17:59 
**********************************************************************************************

So make this bz verified via above tests

QEMU has been recently split into sub-components and as a one-time operation to avoid breakage of tools, we are setting the QEMU sub-component of this BZ to "General". Please review and change the sub-component if necessary the next time you review this BZ. Thanks

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1587