Re: [PATCH v2] hw/arm/virt enable support for virtio-mem

[David Hildenbrand <david@redhat.com>]

On 25.11.20 17:11, Jonathan Cameron wrote:
> On Wed, 25 Nov 2020 16:54:53 +0100
> David Hildenbrand <david@redhat.com> wrote:
> 
>>>>>>
>>>>>> 64k guest on 4k host with 512MiB block size seems fine.
>>>>>>
>>>>>> If there are any places anyone thinks need particular poking I'd appreciate a hint :)    
>>>>>
>>>>> If things seem to work for now, that's great :) Thanks!
>>>>>  
>>>> Cool.  I'll run a few more comprehensive tests then send out the
>>>> trivial patch to enable the kernel option + v2 of the qemu support.  
>>>
>>> Perfect, thanks!  
>>
>> Oh, btw, I have no idea what the state of vfio-pci + QEMU on arm64 is.
>> In case it's supposed to work, you could give
>>
>> https://lkml.kernel.org/r/20201119153918.120976-1-david@redhat.com
>>
>> to see what we're missing.
> 
> vfio-pci works in general (and we use it a lot), so sure I'll give
> this a test run.

Cool.

In case you get it to run, please test with both "online_kernel" and
"online_movable" in the guest, and small boot memory (e.g., 2 GiB).

For example, on x86-64 I got my vfio-pci provided GPUs to consume
virtio-mem memory easily when starting with 2-4 GiB boot memory and
using "online_kernel". (I verified that when not creating the mappings,
IO errors can be observed and graphics are messed up).

-- 
Thanks,

David / dhildenb