On 10/16/2017 04:56 PM, Yang Zhong wrote:
Qemu does not need pin NVDIMM memory for VFIO device during VFIO hotplug, what's more, if there is no NVDIMM hw in the test machine, the VFIO hotplug operation will need at least 10 minutes to pin RAM as the NVDIMM, this time is not accepted. So we add "nopin=on" option in the memory-backed-file, which can avoid to pin RAM memory for NVDIMM.
No. memory-backed-file does not dedicate for nvdimm only, it can be mapped as normal memory as well. Rather more, this is no way to stop guest to use it as DMA.
