[Qemu-discuss] Allow certain CPU cores for VMs

[Martin Snowman]

Hi,

is it possible to configure in qemu or libvirt to exclude certain cores
from VM deployment ?
Let's say we have 24 cores on hypervisor and I want to allocate first four
cores to openvswitch and use next 20 cores for QEMU VMs.

Is this configuration possible ? Whats the best approach.

Example of current Qemu VM:
/usr/bin/qemu-system-x86_64 -name one-76 -S -machine
pc-i440fx-wily,accel=kvm,usb=off -m 12288 -realtime mlock=off -smp
8,sockets=8,cores=1,threads=1 -uuid e1729682-f965-4810-aa3c-c2b7e5e717cb
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-one-76/monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=gluster://XXXX:24007/YYYY/76/disk.0,format=qcow2,if=none,id=drive-virtio-disk0,cache=none
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-drive
file=/ZZZZ/76/disk.1,format=raw,if=none,id=drive-ide0-0-0,readonly=on
-device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev
tap,fd=30,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=02:00:0a:00:65:0b,bus=pci.0,addr=0x3
-netdev tap,fd=44,id=hostnet1 -device
rtl8139,netdev=hostnet1,id=net1,mac=02:00:0a:00:6e:6f,bus=pci.0,addr=0x4
-vnc 0.0.0.0:76 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -msg timestamp=on

Thanks for replies in advance.

BR,
Martin