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+command lspci does not show the IVSHMEM device
+
+qeum version:
+QEMU emulator version 4.2.1
+
+I met a problem when I tried to use IVSHMEM. Command lspci does not show the IVSHMEM device.
+Below is the configuration from my side:
+
+1.  guest vm xml configuration.
+  <shmem name='ivshmem'>
+      <model type='ivshmem-plain'/>
+      <size unit='M'>2</size>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x10' function='0x0'/>
+    </shmem>
+
+2. after the booting up and I found the qemu commandline ideedly  have the device option:
+ps aux | grep ivshmem
+ /usr/bin/qemu-system-x86_64 
+      .......(ignore other options)
+-object memory-backend-file,id=shmmem-shmem0,mem-path=/dev/shm/hostmem,size=4194304,share=yes -device ivshmem-plain,id=shmem0,memdev=shmmem-shmem0,bus=pcie.0,addr=0x10
+
+3. lspci command  not shown the device.
+
+4. lshw command indeedly show the device:
+
+*-memory UNCLAIMED
+             description: RAM memory
+             product: Inter-VM shared memory
+             vendor: Red Hat, Inc.
+             physical id: 10
+             bus info: pci@0000:00:10.0
+             version: 01
+             width: 64 bits
+             clock: 33MHz (30.3ns)
+             configuration: latency=0
+             resources: memory:fcc1c000-fcc1c0ff memory:fdc00000-fdffffff
+
+My host and vm os is ubuntu 20.04 and version is:
+#49~20.04.1-Ubuntu SMP Fri Feb 5 09:57:56 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
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