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Date:   Tue, 12 Jan 2021 10:19:23 -0600
From:   Bjorn Helgaas <>
To:     刘乐乐(乐了) <>
Cc:     Ben Widawsky <>,,,,, Ira Weiny <>,
        Dan Williams <>,
        Vishal Verma <>,
        "Kelley, Sean V" <>,
        Rafael Wysocki <>,
        Jonathan Cameron <>,
        Jon Masters <>,
        Chris Browy <>,
        Randy Dunlap <>,
        Christoph Hellwig <>,
        "Xu, Di" <>
Subject: 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,
you can see Ben's v3 00/16 email and his response to your response,
but your response is missing.

See for details.

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