Re: [RFC PATCH v3 00/16] CXL 2.0 Support

On Tue, Jan 12, 2021 at 10:55:50PM +0800, 刘乐乐(乐了) wrote:

Ben,

Thanks for your hard work. I have compiled this patch(aff2b059786d ,
cxl-2.0v3) together qemu emulator v3, this is the first time I see a CXL
device in linux.

Still I have problems, I can saw the CXL device with `lspci -vvv`  and a
device /dev/cxl/mem0 . But I can't see the memory in system and lsmem
command.

Qemu command line is :

sudo ./qemu-cxl/build/qemu-system-x86_64 -enable-kvm -smp 8 -drive
file=/mnt/lele/vm/cxl-centos8-uefi.qcow2,format=qcow2,cache=none -drive if=pflash,format=raw,unit=0,file=/mnt/lele/edk2/usr/share/edk2-ovmf/x64/OVMF_CODE.fd,readonly=on
-drive if=pflash,format=raw,readonly,unit=1,file=/mnt/lele/edk2/usr/share/edk2-ovmf/x64/OVMF_VARS.fd
-m 32G -vnc :12 -machine type=pc-q35-4.0,hmat=on,accel=kvm -net nic -net
tap,ifname=tap1,script=/mnt/lele/vm/qemu-ifup,downscript=no -object memory-backend-file,id=cxl-mem1,share,mem-path=/mnt/lele/cxl-mem.dat,size=512M
-device pxb-cxl,id=cxl.0,bus=pcie.0,bus_nr=52,uid=0,len-window-base=1,window-base[0]=0x4c0000000,memdev[0]=cxl-mem1
-device cxl-rp,id=rp0,bus=cxl.0,addr=0.0,chassis=0,slot=0 -device
cxl-type3,bus=rp0,memdev=cxl-mem1,id=cxl-pmem0,size=256M

So, what's the further step to show the memory in system memory?

Please use plain text email only.  Your response is valuable, but I
think the linux-kernel and linux-pci mailing lists rejected it because
it was a multi-part message with images and other non-text elements.

If you look at https://lore.kernel.org/linux-cxl/20210112151735.w45qbi37pc3zuucw@intel.com/T/#t (local),
you can see Ben's v3 00/16 email and his response to your response,
but your response is missing.

See http://vger.kernel.org/majordomo-info.html for details.