Virtio

Virtio#

qemu-system-x86_64 \
# vda - 存储
-drive file=alpine.qcow2,if=virtio \
# 网络
-netdev user,id=user.0,hostfwd=tcp::4287-:22 \
-device virtio-net,netdev=user.0
# PCI 10 GbE virtio-net-pci
-net nic,model=virtio
# libvirt <memballoon model='virtio' autodeflate='on'>
-device virtio-balloon,deflate-on-oom=on
# Linux AIO
-drive file=disk.qcow2,if=virtio,aio=native,cache.direct=on
# RNG/Random Number Generator
# =========================
# 默认
# 支持限速 例如 512 bytes/s -> max-bytes=512,period=1000
-device virtio-rng-pci
# UNIX 环境
-object rng-random,filename=/dev/random,id=rng0
# 硬件 rng
-object rng-random,filename=/dev/hwrng,id=rng0
# 网络 RNG
-chardev socket,host=10.199.13.151,port=9000,id=chr0 -object rng-egd,chardev=chr0,id=rng0
<domain>
<!-- 单线程 -->
<iothreads>1</iothreads>
<disk type='file' device='disk'>
<!-- 单线程 -->
<driver name='qemu' type='raw' cache='none' iothread='1'/>
<!-- virtio -->
<target dev='vda' bus='virtio'/>
</disk>
<devices>
<controller type='scsi' index='0' model='virtio-scsi'>
<!-- 单线程 -->
<driver iothread='1'/>
</controller>
</devices>
</domain>
# cluster_size 提高性能
qemu-img create -f qcow2 -o cluster_size=2M my.qcow2 100G
# 设置 cache-size 提高性能
qemu-system-x86_64 -drive file=my.qcow2,if=none,id=drive0,aio=native,cache=none,cache-size=16M
# mode
# off - 不预先申请
# falloc - 使用 posix_fallocate() 预留空间
# full - 填 0 预留
qemu-img create -f $fmt -o preallocation=$mode test.img 100G

virtio-fs#

# 启动 daemon
virtiofsd --socket-path=/var/run/vm001-vhost-fs.sock -o source=/var/lib/fs/vm001
# -virtfs local,path=/tank/storage,mount_tag=host0,security_model=passthrough,id=host0
# QEMU
qemu-system-x86_64 \
-chardev socket,id=char0,path=/var/run/vm001-vhost-fs.sock \
-device vhost-user-fs-pci,chardev=char0,tag=myfs \
-object memory-backend-memfd,id=mem,size=4G,share=on \
-numa node,memdev=mem
# Guest 挂载
mount -t virtiofs myfs /mnt
# virtfs-proxy-helper

ref#

https://www.linux-kvm.org/page/9p_virtio https://blog.csdn.net/gatieme/article/details/82912921 https://wiki.libvirt.org/page/Virtio https://www.linux-kvm.org/page/Virtio http://wiki.osdev.org/Virtio https://www.ibm.com/developerworks/library/l-virtio/ https://fedoraproject.org/wiki/Windows_Virtio_Drivers https://en.wikibooks.org/wiki/QEMU/Devices/Virtio https://wiki.qemu.org/Features/VirtioVsock https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win.iso https://cloud.google.com/compute/docs/machine-types#verifying_the_driver_installation https://events19.lfasiallc.com/wp-content/uploads/2017/11/Storage-Performance-Tuning-for-FAST-Virtual-Machines_Fam-Zheng.pdf

Block format 'raw' does not support the option 'boot'#