tap 模式

qemu-system-x86_64 -M q35,accel=kvm,kernel-irqchip=split \
    -smp cores=4 -m 4G -hda ./test.raw -device intel-iommu,intremap=on \
    -device pxb-pcie,id=pcie.1,bus_nr=8,bus=pcie.0    \
    -device ioh3420,id=pcie_port1,bus=pcie.1,chassis=1 \
    -device pcie-root-port,bus=pcie.0,id=rp1,slot=1 \
    -device pcie-root-port,bus=pcie.0,id=rp2,slot=2 \
    -device pcie-root-port,bus=pcie.0,id=rp3,slot=3,bus-reserve=3 \
    -netdev tap,id=tap_dev0,ifname=tap_dev0,vhost=off,script=/etc/qemu-ifup,downscript=no,queues=6,br=docker0 \
    -device virtio-net-pci,netdev=tap_dev0,bus=rp2,multifunction=on,host_mtu=3500,mrg_rxbuf=off \
    -device e1000e,netdev=tap_dev1,bus=pcie.0 \
    -netdev tap,ifname=tap_dev1,id=tap_dev1,vhost=off,script=/etc/qemu-ifup,downscript=no,queues=6,br=docker0 \
    -monitor telnet:127.0.0.1:6666,server,nowait \
    -qmp unix:/tmp/qmp-sock,server,nowait \
    -serial mon:stdio -nographic

vhost-user vdpa 模式

#dpdk vhost-user:
echo 7 > /sys/bus/pci/devices/0000\:02\:00.0/sriov_numvfs
echo 4096 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
modprobe  vfio-pci
bdf=00:0a.0
./usertools/dpdk-devbind.py -b vfio-pci ${bdf} --force
build/examples/dpdk-vdpa -c 0x2 -n 4 --socket-mem 128 -a ${bdf},vdpa=1,sw-live-migration=1 --iova-mode=va --log-level=.,8 -- --iface /tmp/vdpa-socket --client

#vm:
qemu-system-x86_64 -machine q35,accel=kvm,usb=off,vmport=off,dump-guest-core=off,kernel_irqchip=split -cpu host -m 1G \
                                        -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/dpdk-vdpa,share=yes,size=1G \
                                        -numa node,nodeid=0,memdev=ram-node0 \
                                        -smp 2 ./test.raw \
                                        -enable-kvm \
                                        -netdev vhost-user,chardev=charnet0,id=hostnet0,queues=6 \
                                        -chardev socket,id=charnet0,path=/tmp/vdpa-socket0,server=on \
                                        -device pcie-root-port,port=0x10,chassis=1,id=pci.4,bus=pcie.0,multifunction=on,addr=0x2 \
                                        -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:00:34:56,bus=pci.4,mq=on,host_mtu=3500,mrg_rxbuf=off \
                                        -nographic -serial mon:stdio -monitor tcp:127.0.0.1:3333,server,nowait

vhost-user ovs 模式

qemu-system-x86_64 -machine q35,accel=kvm,usb=off,vmport=off,dump-guest-core=off,kernel_irqchip=split -cpu host -m 1G \
                                        -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages,share=yes,size=1G \
                                        -numa node,nodeid=0,memdev=ram-node0 \
                                        -smp 2 ./test.raw \
                                        -enable-kvm \
                                        -chardev socket,id=charnet0,path=/usr/local/var/run/openvswitch/vhost-user1 \
                                        -netdev vhost-user,chardev=charnet0,id=hostnet0,queues=6 \
                                        -device pcie-root-port,port=0x10,chassis=1,id=pci.4,bus=pcie.0,multifunction=on,addr=0x2 \
                                        -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:00:34:56,bus=pci.4,mq=on,host_mtu=3500,mrg_rxbuf=off \
                                        -chardev socket,id=charnet1,path=/usr/local/var/run/openvswitch/vhost-user2 \
                                        -netdev vhost-user,chardev=charnet1,id=hostnet1,queues=6 \
                                        -device pcie-root-port,port=0x11,chassis=0,id=pci.5,bus=pcie.0,multifunction=on,addr=0x3 \
                                        -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:00:34:57,bus=pci.5,mq=on,host_mtu=3500,mrg_rxbuf=off \
                                        -device e1000e,netdev=tap_dev1,bus=pcie.0 \
                                        -netdev tap,ifname=tap_dev1,id=tap_dev1,vhost=off,script=/etc/qemu-ifup,downscript=no,queues=6,br=docker0 \
                                        -nographic -serial mon:stdio -monitor tcp:127.0.0.1:3333,server,nowait

qemu-ifup

cat << 'EOF' > ./qemu-ifup
#!/bin/sh
set -e

TAP_DEVICE="$1"

echo $TAP_DEVICE
BRIDGE=${br}

# Check if the bridge exists
if ! [ -d "/sys/class/net/${BRIDGE}/bridge" ]; then
    echo "Error: ${BRIDGE} does not exist or is not a bridge."
    exit 1
fi

# Set the TAP device up
ip link set dev "${TAP_DEVICE}" up

# Add the TAP device to the bridge
ip link set "${TAP_DEVICE}" master "${BRIDGE}"

exit 0
EOF
chmod  0777   ./qemu-ifup