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Re: [Qemu-arm] aarch64 ivshmem issues

From: Meng Xu
Subject: Re: [Qemu-arm] aarch64 ivshmem issues
Date: Mon, 11 Jan 2016 10:33:53 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

Hi Pavel,

Thanks! That's right, ivshmem works just fine on ARM64 once I switch to the latest kernel and I can see the PCI bridge and devices now.

Thank you for the help,

On 01/11/2016 03:07 AM, Pavel Fedin wrote:

I am using the ivshmem device to create shared memory between an x86_64 host 
and aarch64
guest. The guest has ubuntu server 14.04 installed with kernel version 3.13.0. 
I wrote a kernel
driver to drive the ivshmem device (as a pci driver) however, the driver was 
never registered:
  There should be no problem with ivshmem itself on ARM64. Last year we did 
some tests with it, and it worked fine out of the box.
  Since you are saying that "the driver was never registered", then, perhaps, 
something is wrong with your guest kernel config. For the start, check whether PCI 
subsystem and PCI generic host is enabled. Mainline kernels older than 4.3 do not support 
generic PCI host controller on ARM64, therefore you have no PCI bus. If your distro has 
older kernel, it is likely to suffer from this problem. Check 'lspci' output on your 

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

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