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

Hi ChangLimin,

Thanks for your reply. I checked again to find the device... I thought the
name was ivshmem.
I don't find any driver code for IVSHMEM in the linux and qemu repo. Can
you give me some help?

00:10.0 RAM memory: Red Hat, Inc. Inter-VM shared memory (rev 01)
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: fast devsel
Memory at fcc1c000 (32-bit, non-prefetchable) [size=256]
Memory at fdc00000 (64-bit, prefetchable) [size=4M]

Thanks,
Sean






On Tue, Mar 2, 2021 at 3:31 PM ChangLimin <email address hidden> wrote:

> Can you give the lspci messages? The below is my output.  There is a RAM
> memory device.
>
> $ lspci
> 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev
> 02)
> 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
> 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton
> II]
> 00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton
> II] (rev 01)
> 00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
> 00:02.0 VGA compatible controller: Device 1234:1111 (rev 02)
> 00:03.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
> 00:04.0 Ethernet controller: Red Hat, Inc. Virtio network device
> 00:05.0 SCSI storage controller: Red Hat, Inc. Virtio SCSI
> 00:06.0 Communication controller: Red Hat, Inc. Virtio console
> 00:10.0 RAM memory: Red Hat, Inc. Inter-VM shared memory (rev 01)
> 01:07.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
>
>
> *From:* sean kuo <email address hidden>
> *Date:* 2021-03-02 11:24
> *To:* qemu-devel <email address hidden>
> *Subject:* [Bug 1917394] [NEW] command lspci does not show the IVSHMEM
> device
> 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
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> 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
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1917394/+subscriptions
>
>
>


Thanks so much ChangLimin! You saved me a lot of time.


Thanks,
Sean

On Tue, Mar 2, 2021 at 4:15 PM ChangLimin <email address hidden> wrote:

> There is no driver for it. You should write it by youself. Maybe you can
> refer to
> http://doc.dpdk.org/guides-1.8/prog_guide/ivshmem_lib.html and dpdk
> source.
>
> Gool luck!
>
>
> *From:* Sean Kuo <email address hidden>
> *Date:* 2021-03-02 15:59
> *To:* ChangLimin <email address hidden>
> *CC:* Bug 1917394 <email address hidden>; qemu-devel
> <email address hidden>
> *Subject:* Re: [Bug 1917394] [NEW] command lspci does not show the
> IVSHMEM device
> Hi ChangLimin,
>
> Thanks for your reply. I checked again to find the device... I thought the
> name was ivshmem.
> I don't find any driver code for IVSHMEM in the linux and qemu repo. Can
> you give me some help?
>
> 00:10.0 RAM memory: Red Hat, Inc. Inter-VM shared memory (rev 01)
> Subsystem: Red Hat, Inc. QEMU Virtual Machine
> Flags: fast devsel
> Memory at fcc1c000 (32-bit, non-prefetchable) [size=256]
> Memory at fdc00000 (64-bit, prefetchable) [size=4M]
>
> Thanks,
> Sean
>
>
>
>
>
>
> On Tue, Mar 2, 2021 at 3:31 PM ChangLimin <email address hidden> wrote:
>
>> Can you give the lspci messages? The below is my output.  There is a RAM
>> memory device.
>>
>> $ lspci
>> 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev
>> 02)
>> 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
>> 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton
>> II]
>> 00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB
>> [Natoma/Triton II] (rev 01)
>> 00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
>> 00:02.0 VGA compatible controller: Device 1234:1111 (rev 02)
>> 00:03.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
>> 00:04.0 Ethernet controller: Red Hat, Inc. Virtio network device
>> 00:05.0 SCSI storage controller: Red Hat, Inc. Virtio SCSI
>> 00:06.0 Communication controller: Red Hat, Inc. Virtio console
>> 00:10.0 RAM memory: Red Hat, Inc. Inter-VM shared memory (rev 01)
>> 01:07.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
>>
>>
>> *From:* sean kuo <email address hidden>
>> *Date:* 2021-03-02 11:24
>> *To:* qemu-devel <email address hidden>
>> *Subject:* [Bug 1917394] [NEW] command lspci does not show the IVSHMEM
>> device
>> 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
>>
>> --
>> You received this bug notification because you are a member of qemu-
>> devel-ml, which is subscribed to QEMU.
>> 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
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/qemu/+bug/1917394/+subscriptions
>>
>>
>>


Sounds like this question has been solved, thus I'm closing this ticket now.