专题：Qemu/KVM

#!/bin/bash

qemu-system-x86_64 -enable-kvm \

-machine q35,accel=kvm -device intel-iommu \

-cpu host -smp 4,sockets=1,cores=4,threads=1 \

-m 4096 -mem-path=/var/2Mpages -mem-prealloc \

####################网络设备#############################################################

-netdev tap,ifname=T_0,script=TAP.sh,downscript=no,smb=/home/QemuSMB,vhost=on,id=N_0 \

-device virtio-net-pci,mac=00:11:22:33:44:07,netdev=N_0 \

####################磁盘设备#############################################################

-drive file=RHEL.img,if=none,cache=writeback,media=disk,discard=on,id=RHEL 

-device virtio-blk-pci,drive=RHEL \ 

　　 #########################################################################################

-drive file=RHEL.iso,readonly=on,media=cdrom \

-boot order=cdn \

-display none -monitor stdio

／*基于硬件IOMMU支持的硬件直接分配技术：VFIO*/ 
#modprobe vfio-pci
#echo 8086 8c20 > /sys/bus/pci/drivers/vfio-pci/new_id
#echo 0000:00:1b.0 > /sys/bus/pci/devices/0000:00:1b.0/driver/unbind
#echo 0000:00:1b.0 > /sys/bus/pci/drivers/vfio-pci/bind
／*Qemu设置直连物理网卡示例*/
#-device vfio-pci,host=00:1b.0
#-net none

#!/bin/bash
IpAddr="10.4.4.4/8"
GateWay="10.0.0.1"
Switch=br0
If_0=eth0
If_1=eth1
Mem=4096

#All interfaces‘ IPs have been deleted except "lo".
Del_IP() {
    IFs=$(ip addr | grep -oP ‘\w+(?=:\s+<)‘ | grep -v ‘lo‘)
    local I
    for InterFace in $IFs
    do
        ip addr flush dev $InterFace
    done
}

Set_IP() {
　　if [[ ‘0‘ == $(ip link | grep -c $Swith) ]]
　　then
　　　　ip link add $switch type bridge
　　fi
　　ip link set $switch up
　　ip link set $If_0 up
　　ip link set $If_0 master $switch
　　ip link set $If_0 up
　　ip link set $If_0 master $switch
　　ip addr add $IpAddr dev $switch
　　ip route replace default via $GateWay dev $switch
}

2M_hugepages() {
    local Num=$(sysctl vm.nr_hugepages)
    if [[ $Num -lt $Mem ]]
    thenmkdir -p /var/2Mpagesmount -t hugetlbfs hugetlbfs /var/2Mpages #可在 /etc/fstab 中挂载
        sysctl vm.nr_hugepages=$Memfi
}

(2M_hugepages; del_IP; Set_IP) 2>/dev/null

ip link set $1 up
sleep 0.5s
ip link set $1 master br0