[Bug 1917394] [NEW] command lspci does not show the IVSHMEM device

[sean kuo]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1917394

Title:
  command lspci does not show the IVSHMEM device

Status in QEMU:
  New

Bug description:
  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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