Re: [QEMU-devel][RFC PATCH 1/1] backends/hostmem: qapi/qom: Add an ObjectOption for memory-backend-* called HostMemType and its arg 'cxlram'

[David Hildenbrand]

On 01.01.24 08:53, Ho-Ren (Jack) Chuang wrote:
> Introduce a new configuration option 'host-mem-type=' in the
> '-object memory-backend-ram', allowing users to specify
> from which type of memory to allocate.
>
> Users can specify 'cxlram' as an argument, and QEMU will then
> automatically locate CXL RAM NUMA nodes and use them as the backend memory.
> For example:
>         -object memory-backend-ram,id=vmem0,size=19G,host-mem-type=cxlram \
>         -device pxb-cxl,bus_nr=12,bus=pcie.0,id=cxl.1 \
>         -device cxl-rp,port=0,bus=cxl.1,id=root_port13,chassis=0,slot=2 \
>         -device cxl-type3,bus=root_port13,volatile-memdev=vmem0,id=cxl-vmem0 \
>         -M 
> cxl-fmw.0.targets.0=cxl.1,cxl-fmw.0.size=19G,cxl-fmw.0.interleave-granularity=8k
>  \

You can achieve the exact same thing already simply by using memory 
policies and detecting the node(s) before calling QEMU, no?

There has to be a good reason to add such a shortcut into QEMU, and it 
should be spelled out here.

--
Cheers,

David / dhildenb