Description of problem:
rhel7.2 guest can not recognize the disk when hotplug a virtio-1 enabled disk to pci-bridge, if disable virtio-1, works well

Version-Release number of selected component (if applicable):

kernel:3.10.0-294.el7.x86_64
qemu-kvm-rhev-2.3.0-10.el7.x86_64

How reproducible:

100%

Steps to Reproduce:
1.boot a rhel7.2 guest with a pci-bridge:
full command line:
/usr/libexec/qemu-kvm -S -M pc -cpu host -enable-kvm -m 4096 \
-smp 4,sockets=4,cores=1,threads=1 -no-kvm-pit-reinjection -name sluo-test \
-uuid b18fdd6c-a213-4022-9ca4-5d07225e40b0 \
-rtc base=localtime,clock=host,driftfix=slew \
-device virtio-serial-pci,disable-legacy=true,disable-modern=false,id=virtio-serial0,max_ports=16,vectors=0,bus=pci.0,addr=0x3,ioeventfd=on \
-chardev socket,id=channel1,path=/home/testdisk/socketfile4Gqcow2,server,nowait \
-device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port1 \
-chardev socket,id=channel2,path=/home/testdisk/socketfile3Gqcow2,server,nowait \
-device virtserialport,chardev=channel2,name=com.redhat.rhevm.vdsm1,bus=virtio-serial0.0,id=port2 \
-drive file=/home/RHEL-Server-7.2-64-virtio-scsi.qcow2,if=none,id=drive-system-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop,serial=QEMU-DISK1 \
-device virtio-scsi-pci,id=scsi0,bus=pci.0,ioeventfd=off -device scsi-hd,bus=scsi0.0,drive=drive-system-disk,id=system-disk,channel=0,scsi-id=0,lun=0,ver=mike,serial=ababab,bootindex=1 \
-netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup \
-device virtio-net-pci,disable-legacy=true,disable-modern=false,netdev=hostnet0,id=virtio-net-pci0,mac=08:2e:5f:0a:1d:b1,bus=pci.0,addr=0x5,bootindex=2 \
-device virtio-balloon-pci,disable-legacy=true,disable-modern=false,id=ballooning,bus=pci.0,addr=0x6 \
-serial unix:/tmp/ttyS0,server,nowait \
-qmp tcp:0:4444,server,nowait -k en-us -boot menu=on \
-vnc :1 -spice disable-ticketing,port=5931 -vga qxl -monitor stdio \
-device pci-bridge,id=bridge1,bus=pci.0,chassis_nr=1 \
-drive file=/home/testdisk/ide-disk15G.raw,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,readonly=on,werror=stop,rerror=stop,serial=QEMU-DISK2 \
-device virtio-scsi-pci,disable-legacy=true,disable-modern=false,id=scsi1,bus=bridge1,ioeventfd=off,addr=0xb -device scsi-hd,bus=scsi1.0,drive=drive-data-disk,channel=0,ver=mike,serial=cababab,scsi-id=1,lun=1,id=data-disk \
-device scsi-hd,bus=scsi1.0,drive=drive-data-disk1,channel=0,ver=mike,serial=cababab,scsi-id=15,lun=16383,id=data-disk1 \
-drive file=/home/testdisk/bot-disk3-7G.qcow2,if=none,id=drive-data-disk1,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop \

2.hotplug a virtio-1 enabled virtio-scsi disk to pci-bridge

{"execute":"device_add","arguments":{"driver":"virtio-scsi-pci","id":"test36","disable-legacy":"true","disable-modern":"false","bus":"bridge1","addr":"0x3"}}
{"return": {}}
{"execute":"__com.redhat_drive_add", "arguments": {"file":"/tmp/stg0.qcow2","format":"qcow2","id":"test30"}}
{"return": {}}
{"execute":"device_add","arguments":{"driver":"scsi-hd","drive":"test30","id":"test30","bus":"test36.0"}}
{"return": {}}

3.check the disk via "fdisk -l" in guest

Actual results:

after step 3, no the hotplugged disk in guest, the disk can be found via "{"execute": "query-block"}" . If reboot guest, the disk can be found in guest.


Expected results:
guest can recognize the hotplugged disk in guest.

Additional info: