Re: [Qemu-devel] [PATCH 0/2] add "nopin" option in the memory-backend-file

[Paolo Bonzini]

On 18/10/2017 07:57, Zhong Yang wrote:
>   Your suggestion can avoid DMA target to nvdimm if the nvdimm memory region
>   was skipped during VFIO hotplug. It is valuable to try this solution. by the
>   way, please share me some clue for PCI address space related with memory 
> region,
>   below address_space_mem is right?  Many thanks!
> 
>   static void pci_bus_init(PCIBus *bus, DeviceState *parent,
>                          MemoryRegion *address_space_mem,
>                          MemoryRegion *address_space_io,
>                          uint8_t devfn_min)  

Yes.  You would have to add the region directly to the CPU address
space, and not to address_space_memory (which is included in both the
CPU and PCI address spaces).

Paolo