[PATCH RFC v4 00/13] virtio-mem: paravirtualized memory

Alex Shi
Tue, 09 Jun 2020 03:05:50 -0000

? 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.
>