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[CXL volatile MEM] - Qemu command to turn on HMAT and NUMA fails with as


From: Samarth Saxena
Subject: [CXL volatile MEM] - Qemu command to turn on HMAT and NUMA fails with assertion
Date: Mon, 9 Aug 2021 16:38:38 +0000

Hi All,

 

I am trying the following command to run Qemu with Kernel 5.14.

 

qemu-system-x86_64 -M q35,accel=kvm,nvdimm=on,cxl=on,hmat=on -m 8448M,slots=2,maxmem=16G -smp 8,sockets=2,cores=2,threads=2 -hda /lan/dscratch/singhabh/shradha/ubuntu-20.10-64_with_orig_driver_backup.qcow2 -enable-kvm -usbdevice tablet -L $VB_ROOT/etc/vm/common/ -object memory-backend-ram,id=cxl-ram,share=on,size=256M -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-ram" -device cxl-rp,id=rp0,bus=cxl.0,addr=0.0,chassis=0,slot=0 -device cxl-type3,bus=rp0,memdev=cxl-ram,id=cxl-vmem0,size=256M -numa node,nodeid=0,memdev=cxl-ram -object memory-backend-ram,id=other-ram,size=8G,prealloc=n,share=off -numa node,nodeid=1,memdev=other-ram,initiator=0 -numa cpu,node-id=0,socket-id=0 -numa cpu,node-id=0,socket-id=1

 

I get the following crash before the machine starts to boot.

 

qemu-system-x86_64: ../softmmu/memory.c:2443: memory_region_add_subregion_common: Assertion `!subregion->container' failed.

 

 

Please help me find what’s wrong here.

 

Regards,

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Samarth Saxena 
Sr Principal Software Engineer
T: +911204308300   

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