On 05.06.20 12:46, Alex Shi wrote: > > > 在 2020/6/5 下午6:05, David Hildenbrand 写道: >>> 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 (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
