Linux Virtualization - Jun 2020 - [PATCH RFC v4 00/13] virtio-mem: paravirtualized memory

? 2020/6/5 ??6:05, David Hildenbrand ??:
>> I guess I know what's happening here. In case we only have DMA
memory
>> when booting, we don't reserve swiotlb buffers. Once we hotplug
memory
>> and online ZONE_NORMAL, we don't have any swiotlb DMA bounce
buffers to
>> map such PFNs (total 0 (slots), used 0 (slots)).
>>
>> Can you try with "swiotlb=force" on the kernel cmdline?
> Alternative, looks like you can specify "-m
2G,maxmem=16G,slots=1", to
> create proper ACPI tables that indicate hotpluggable memory. (I'll have
> to look into QEMU to figure out to always indicate hotpluggable memory
> that way).
> 

That works too. Yes, better resolved in qemu, maybe. :)

Thanks!

On 05.06.20 12:46, Alex Shi wrote:
> 
> 
> ? 2020/6/5 ??6:05, David Hildenbrand ??:
>>> I guess I know what's happening here. In case we only have DMA
memory
>>> when booting, we don't reserve swiotlb buffers. Once we hotplug
memory
>>> and online ZONE_NORMAL, we don't have any swiotlb DMA bounce
buffers to
>>> map such PFNs (total 0 (slots), used 0 (slots)).
>>>
>>> Can you try with "swiotlb=force" on the kernel cmdline?
>> Alternative, looks like you can specify "-m
2G,maxmem=16G,slots=1", to
>> create proper ACPI tables that indicate hotpluggable memory. (I'll
have
>> to look into QEMU to figure out to always indicate hotpluggable memory
>> that way).
>>
> 
> 
> That works too. Yes, better resolved in qemu, maybe. :)
> 
You can checkout

git at github.com:davidhildenbrand/qemu.git virtio-mem-v4

(prone to change before officially sent), which will create srat tables
also if no "slots" parameter was defined (and no -numa config was
specified).

Your original example should work with that.

-- 
Thanks,

David / dhildenb

? 2020/6/5 ??8:18, David Hildenbrand ??:
> On 05.06.20 12:46, Alex Shi wrote:
>>
>>
>> ? 2020/6/5 ??6:05, David Hildenbrand ??:
>>>> I guess I know what's happening here. In case we only have
DMA memory
>>>> when booting, we don't reserve swiotlb buffers. Once we
hotplug memory
>>>> and online ZONE_NORMAL, we don't have any swiotlb DMA
bounce buffers to
>>>> map such PFNs (total 0 (slots), used 0 (slots)).
>>>>
>>>> Can you try with "swiotlb=force" on the kernel
cmdline?
>>> Alternative, looks like you can specify "-m
2G,maxmem=16G,slots=1", to
>>> create proper ACPI tables that indicate hotpluggable memory.
(I'll have
>>> to look into QEMU to figure out to always indicate hotpluggable
memory
>>> that way).
>>>
>>
>>
>> That works too. Yes, better resolved in qemu, maybe. :)
>>
> 
> You can checkout
> 
> git at github.com:davidhildenbrand/qemu.git virtio-mem-v4
yes, it works for me. Thanks!
> 
> (prone to change before officially sent), which will create srat tables
> also if no "slots" parameter was defined (and no -numa config was
> specified).
> 
> Your original example should work with that.
>