在 2020/6/5 下午8:18, David Hildenbrand 写道: > 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 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. >
