Created attachment 1477781 [details]
dmesg log of guest after hotplug

Description of problem:
Guest reboot immediately after hotplug pcie-pci-bridge into pcie-root-port that without "bus-reserver=1" and then also guest can found pcie-pci-bridge

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.12.0-11.el7.x86_64
kernel-3.10.0-933.el7.x86_64

How reproducible:
3/3

Steps to Reproduce:
1.Boot guest with qemu command line [1]

2.Plug pcie-pci-bridge into pcie-root-port
(qemu) device_add pcie-pci-bridge,id=bridge3,bus=pci.8

3.check pcie-pci-bridge through "info qtree"
(qemu) info qtree
bus: main-system-bus
  type System
  dev: kvm-ioapic, id ""
    gpio-in "" 24
    gsi_base = 0 (0x0)
    mmio 00000000fec00000/0000000000001000
  dev: q35-pcihost, id ""
    MCFG = 2952790016 (0xb0000000)
    pci-hole64-size = 34359738368 (32 GiB)
    short_root_bus = 0 (0x0)
    below-4g-mem-size = 2147483648 (2 GiB)
    above-4g-mem-size = 2147483648 (2 GiB)
    x-pci-hole64-fix = true
    bus: pcie.0
      type PCIE
      dev: pcie-root-port, id "pci.8"
        x-migrate-msix = true
        bus-reserve = 4294967295 (0xffffffff)
        io-reserve = 18446744073709551615 (16 EiB)
        mem-reserve = 18446744073709551615 (16 EiB)
        pref32-reserve = 18446744073709551615 (16 EiB)
        pref64-reserve = 18446744073709551615 (16 EiB)
        power_controller_present = true
        chassis = 8 (0x8)
        slot = 0 (0x0)
        port = 23 (0x17)
        aer_log_max = 8 (0x8)
        addr = 09.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        x-pcie-lnksta-dllla = true
        x-pcie-extcap-init = true
        class PCI bridge, addr 00:09.0, pci id 1b36:000c (sub 0000:0000)
        bar 0: mem at 0xfce17000 [0xfce17fff]
        bus: pci.8
          type PCIE
          dev: pcie-pci-bridge, id "bridge3"
            msi = "auto"
            addr = 00.0
            romfile = ""
            rombar = 1 (0x1)
            multifunction = false
            command_serr_enable = true
            x-pcie-lnksta-dllla = true
            x-pcie-extcap-init = true
            class PCI bridge, addr 09:00.0, pci id 1b36:000e (sub 0000:0000)
            bar 0: mem at 0xfc400000 [0xfc4000ff]
            bus: bridge3
              type PCI

4. Check pcie-pci-bridge in the guest
# lspci -vvv -t
-[0000:00]-+-00.0  Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller
           +-01.0  Red Hat, Inc. QXL paravirtual graphic card
           +-03.0-[01]----00.0  Red Hat, Inc. Virtio block device
           +-03.1-[02]----00.0  Red Hat, Inc. Virtio network device
           +-03.2-[03-04]----00.0-[04]--
           +-03.3-[05-06]--
           +-07.0-[07-08]----00.0-[08]----01.0  Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet Adapter
           +-09.0-[09-0a]----00.0-[0a]--
           +-1d.0  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1
           +-1d.1  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2
           +-1d.2  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3
           +-1d.7  Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1
           +-1f.0  Intel Corporation 82801IB (ICH9) LPC Interface Controller
           +-1f.2  Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode]
           \-1f.3  Intel Corporation 82801I (ICH9 Family) SMBus Controller


Actual results:
guest reboot immediately after hotplug pcie-pci-bridge

Expected results:
Guest didn't reboot


Additional info:
[1]
/usr/libexec/qemu-kvm \
-M q35 \
-cpu SandyBridge \
-nodefaults -rtc base=utc \
-m 4G \
-smp 4,sockets=4,cores=1,threads=1 \
-enable-kvm \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-k en-us \
-nodefaults \
-boot menu=on \
-qmp tcp:0:6667,server,nowait \
-usb \
-device usb-tablet \
-vga qxl \
-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x3 \
-device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x3.0x1 \
-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x3.0x2 \
-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x3.0x3,bus-reserve=1 \
-drive file=/home/env/rhel76-64-virtio-scsi.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,drive=drive-virtio-disk0,id=virtio-disk0,bus=pci.1,bootindex=0 \
-device virtio-net-pci,netdev=tap10,mac=00:52:68:26:31:03,id=net0,bus=pci.2 -netdev tap,id=tap10 \
-device pcie-pci-bridge,id=bridge1,bus=pci.3 \
-device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x7 \
-device pcie-pci-bridge,id=bridge2,bus=pci.7 \
-device rtl8139,netdev=tap11,mac=00:52:68:26:31:04,id=net1,bus=bridge2,addr=0x1 -netdev tap,id=tap11 \
-device pcie-root-port,port=0x17,chassis=8,id=pci.8,bus=pcie.0,addr=0x9 \
-monitor stdio \
-vnc :1 \