Re: [Qemu-arm] aarch64 ivshmem issues

[Meng Xu <xumeng1901@gmail.com>]

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,
Meng

On 01/11/2016 03:07 AM, Pavel Fedin wrote:
>   Hello!
>
>> 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 guest.
>
> Kind regards,
> Pavel Fedin
> Expert Engineer
> Samsung Electronics Research center Russia
>
>