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

[Alex Shi]

å 2020/6/5 äå8:18, David Hildenbrand åé:
> On 05.06.20 12:46, Alex Shi wrote:
>>
>>
>> å 2020/6/5 äå6:05, David Hildenbrand åé:
>>>> 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@xxxxxxxxxx: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.
>