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-Illegal instruction when I want to numactl --cpubind=0 --membind=1 to CXL Memory
-Description of problem:
-I ran QEMU for simulating CXL DRAM and when I tried to run `numactl --cpubind=0 --membind=1  ls` , I got `Illegal instruction`
-The numa node 1 was the CXL DRAM simulated by QEMU.
-
-> root@8003:~# numactl -H
-> available: 2 nodes (0-1)
-> node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
-> node 0 size: 32090 MB
-> node 0 free: 31325 MB
-> node 1 cpus:
-> node 1 size: 32768 MB
-> node 1 free: 32768 MB
-> node distances:
-> node 0 1
-> 0: 10 20
-> 1: 20 10
-
-When I ran on numa node 1, no failed
-
-> root@8003:~# numactl --membind=0 ls
-> ndctl
-
-When I ran on numa node 1(CXL DRAM),it failed.
-
-> root@8003:~# numactl --membind=1 ls
-> [ 913.975032] traps: ls[667] trap invalid opcode ip:7fdec255d180 sp:7ffd3c507288 error:0 in ld-linux-x86-64.so.2[7fdec2546000+2a000]
-> **Illegal instruction**
-Steps to reproduce:
-1. start the guest
-2. cxl list  (we could see the simulated CXL DRAM)
-> root@8003:~# cxl list
-> [
->   {
->     "memdev":"mem0",
->     "ram_size":34359738368,
->     "serial":0,
->     "host":"0000:0d:00.0"
->   }
-> ]
-3. cxl create-region -t ram -d decoder0.0 -m mem0
-4. daxctl reconfigure-device dax0.0 --mode=system-ram
-5. numactl -H
-> root@8003:~# numactl -H
-> available: 2 nodes (0-1)
-> node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
-> node 0 size: 32090 MB
-> node 0 fr
-> ee: 31254 MB
-> node 1 cpus:
-> node 1 size: 32768 MB
-> node 1 free: 32768 MB
-> node distances:
-> node   0   1 
->   0:  10  20 
->   1:  20  10 
-6. numactl --membind=1 ls
-> root@8003:~# numactl --membind=1 ls
-> [38441.892140] **traps: ls[861] trap invalid opcode ip:7f15db6ac180 sp:7ffc648755c8 **error:0 in ld-linux-x86-64.so.2[7f15db695000+2a000]
-> **Illegal instruction**
-Additional information:
-When I run dmesg, I found an error.
-> root@8003:~# dmesg|grep error
-> [    2.321130] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
-
-Since my CPU is a Xeon III, not a Xeon IV with CXL support, **I'm wondering if it's because the CPU doesn't support CXL instructions, or if the Xeon III can emulate it, just because my settings don't make sense**. If this is my settings problem, could you help me to deal this? Or it just caused by my Xeon III,I will update it to  Xeon IV.