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+id = 935
+title = "insert ivshmem device into pci-bridge, but vm network disconnects"
+state = "opened"
+created_at = "2022-03-25T09:00:05.289Z"
+closed_at = "n/a"
+labels = []
+url = "https://gitlab.com/qemu-project/qemu/-/issues/935"
+host-os = "Ubuntu"
+host-arch = "x64"
+qemu-version = "qemu-x86_64 version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.39)"
+guest-os = "Win10 19043.1586"
+guest-arch = "x64"
+description = """To extend PCI slot number in Windows vm, a new pci-bridge is created in Windows vm as bus.1. But when I insert a ivshmem file in host to this pci-bridge(bus.1), the Windows vm disconnects(lose remote desktop connection)."""
+reproduce = """1. add new pci-bridge into windows vm, add windows vm xml configuration like this:
+```xml
+<devices>
+  <controller type='pci' index='0' model='pci-root'/>
+  <controller type='pci' index='1' model='pci-bridge'>
+    <address type='pci' domain='0' bus='0' slot='0x0d' function='0' multifunction='off'/>
+  </controller>
+</devices>
+```
+
+2.restart this Windows vm, new pci-bridge has been created, its name is pci.1 and bus is bus.1:
+```sh
+$ virsh qemu-monitor-command --hmp --domain 56 --cmd info pci
+  Bus  0, device  13, function 0:
+    PCI bridge: PCI device 1b36:0001
+      IRQ 10.
+      BUS 0.
+      secondary bus 1.
+      subordinate bus 1.
+      IO range [0xc000, 0xcfff]
+      memory range [0xfe000000, 0xfe1fffff]
+      prefetchable memory range [0xe4000000, 0xe41fffff]
+      BAR0: 64 bit memory at 0xfe422000 [0xfe4220ff].
+      id "pci.1"
+```
+3. create a shm file `/dev/shm/test1` in host using `shm_open()`, size is 32M
+
+4. create new object: 
+```sh
+virsh qemu-monitor-command --hmp --domain 56 --cmd object_add memory-backend-file,share=on,id=objtest1,size=32M,mem-path=/dev/shm/test1
+```
+
+5. insert this ivshmem file into new pci-bridge and use bus.1 slot number(1:1.0):
+```sh
+virsh qemu-monitor-command --hmp --domain 56 --cmd device_add ivshmem-plain,memdev=objtest1,id=test1,bus=pci.1,addr=0x01.0x00
+```
+
+6. After inserting this ivshmem file into new pci-bridge, the remote desktop connection of this windows vm disconnects.
+
+7. New ivshmem file has been created:
+```
+$ virsh qemu-monitor-command --hmp --domain 57 --cmd info pci
+  Bus  1, device   1, function 0:
+    RAM controller: PCI device 1af4:1110
+      BAR0: 32 bit memory at 0xfe1fff00 [0xfe1fffff].
+      BAR2: 64 bit prefetchable memory at 0x4bc000000 [0x4bfffffff].
+      id "test1"
+
+```"""
+additional = """When insert ivshmem file into bus.1(pci-bridge), the remote desktop connection of Windows vm is sometimes disconnected, and sometimes it is normal.
+
+The newly added ivshmem device can be found in the device manager of the Windows vm, but sometimes it cannot be found.
+
+Thanks for your help!"""