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 <changlm@chinatelecom.cn> 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
Date: 2021-03-02 11:24
To: qemu-devel
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

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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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