Visible to Intel only — GUID: ldh1628274019070
Ixiasoft
Visible to Intel only — GUID: ldh1628274019070
Ixiasoft
3.5.2.4.4.2. Create Guest VM by using QEMU
Follow the steps needed to create a guest environment and assign VF device to VM by using QEMU.
- Unbind the device from UIO driver:
$./dpdk-devbind.py -u <bdf>
- Install vfio-pci module.
$modprobe vfio-pci
- Bind the device to vfio-pci.
- In case the device is binded to ifc_uio, unbind with the following command:
$ echo "<bdf>" > /sys/bus/pci/devices/\ <bdf>/driver/unbind
For example:echo "0000:01:00.0" > /sys/bus/pci/devices/\ 0000\:01\:00.0/driver/unbind
- Bind the device to vfio-pci.
$ echo <PCI Vendor ID> <PCI Device ID> > /sys/bus/pci/drivers/vfio-pci/new_id
For example:echo 1172 0000 > /sys/bus/pci/drivers/vfio-pci/new_id
- In case the device is binded to ifc_uio, unbind with the following command:
- For CentOS VMs: Use QEMU version 3.0.0 rc0 on Intel machines. Creating a VM with 8 GB RAM is advisable.
./qemu-3.0.0-rc0/x86_64-softmmu/qemu-system-x86_64 -smp 8 -m 10240M -boot c -machine q35,kernel-irqchip=split -cpu host -enable-kvm -nographic -L /home/dev/QEMU/qemu-3.0.0-rc0/pc-bios -name offload1 -hda /home/dev/QEMU/vm1.qcow2 -device vfio-pci,host=01:00.4 -netdev type=tap,id=net6551,script=no,downscript=no,vhost=on,ifname=net6551 -device virtio-net-pci,netdev=net6551 -device intel-iommu,intremap=on,caching-mode=on -serial telnet::5551,server,nowait -object memory-backend-file,id=mem,size=10240M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc -monitor telnet::3331,server,nowait&
On another terminal (vm)telnet localhost 5551 ifconfig eth0 up user:root pass:root Bring up interface. $ifconfig eth0 up Assign the IP address to eth0. $ifconfig eth0 <1.1.1.11>
On Host$ifconfig net6551 up $ifconfig net6551 <1.1.1.12>
Copy the code by using scp.
Example: $scp -r <directory> root@<GuestIP>:/ <path_to_the_directory>/
- For Ubuntu VMs:
Get the qemu 7.0.0 version and compile using below steps
wget https://download.qemu.org/qemu-7.0.0.tar.xz tar xvJf qemu-7.0.0.tar.xz cd qemu-7.0.0 ./configure make -j$nproc cd ..
Get Ubuntu VM imagewget https://cloud-images.ubuntu.com/releases/jammy/release/ubuntu-22.04-server-cloudimg-amd64.img mv ubuntu-22.04-server-cloudimg-amd64.img ubuntu-22.04.qcow2 sudo qemu-img create -f qcow2 -F qcow2 -o backing_file=./ubuntu-22.04.qcow2 mcdma_VM-1.qcow2 50G qemu-img info mcdma_VM-1.qcow2 sudo genisoimage -output VM-1-cidata.iso -volid cidata -joliet -rock user-data meta-data
Command to launch the VM
sudo qemu-7.0.0/build/x86_64-softmmu/qemu-system-x86_64 -smp 8 -machine accel=kvm,type=q35,kernel-irqchip=split -cpu host -enable-kvm -nographic -boot c -L qemu-7.0.0/build/pc-bios -cpu host -m 20G -hda mcdma_VM-1.qcow2 -cdrom VM-1-cidata.iso -device vfio-pci,host=$BDF -serial telnet::5551,server,nowait -monitor telnet::3331,server,nowait&
Note:- On AMD machines, the parameter -device intel-iommu,intremap=on,caching-mode=on is not required.
- If multiple devices are in the same group, check for ACS enablement in root port and bridge.
- Below are the Host and Guest VM configurations used for verification:
Table 43. Host System Configuration Host System Configuration Details Operating System CentOS Linux release 7.8
Ubuntu 22.04 LTS
Linux Kernel CentOS: 3.10.0-1127.10.1.el7.28.x86_64
Ubuntu: 5.15.0-52-generic x86_64
CPU Cores 96 RAM 128 GB (64 GB on single NUMA) Hypervisor KVM Qemu Version QEMU version 3.0.0-rc0 Table 44. Guest System Configuration Guest System Configuration Details Operating System CentOS Linux release 7.8 Linux Kernel 3.10.0-1127.10.1.el7.28.x86_64 CPU Cores 2 RAM 8 GB