qemu/qemu-kvm/qemu-system-x86_64/qemu-x86_64命令的区别?

刚想玩玩kvm,结果分不清这几个命令。。搜了一下,记录下来,希望对大家有帮助。

摘抄

1

在老版本中有单独的qemu-kvm模块存在,结合qemu一起做虚拟机工作。在后续新版本中,已经将qemu-kvm模块完全合并到qemu中去。因此当需要使用kvm特性时候,只需要qemu-system-x86_64 启动命令中增加参数 –enable-kvm参数使能即可。

(http://blog.csdn.net/tantexian/article/details/41281171)

2

I asked the mailing list, here’s what I got:

qemu-arch like /usr/local/bin/qemu-x86_64 is for running a program of that arch on the host machine of what ever arch, but not a virtual machine
qemu-system-arch like /usr/local/bin/qemu-system-x86_64 is for running a system of that arch on the host machine to enable kvm support, qemu parameter -enable-kvm is needed, libvirt should have taken care of this if right xml is configured

Thanks Jakob for the answer in the mailing list.

(http://serverfault.com/questions/767212/difference-between-qemu-kvm-qemu-system-x86-64-qemu-x86-64)

意思是,类似qemu-x86_64这种命令是运行某种架构的程序的,qemu-system-x86_64是运行某种架构系统的(虚拟机),如果需要kvm支持,需要加上参数 -enable-kvm, 如果使用libvirt可以配置相应的xml来实现kvm支持。

3

Actually, qemu-kvm is a simple wrapper of qemu-system-x86_64.

In my x86_64 gentoo OS, the content of qemu-kvm script is

#!/bin/sh$ exec /usr/bin/qemu-system-x86_64 –enable-kvm “$@”

(https://lists.nongnu.org/archive/html/qemu-discuss/2012-02/msg00018.html)

意思是,gentoo里面的qemu-kvm就是运行“qemu-system-x86_64 –enable-kvm”, 是一个脚本。

4

The KVM project used to maintain a fork of QEMU called qemu-kvm. All feature differences have been merged into QEMU upstream and the development of the fork suspended.

To use KVM pass –enable-kvm to QEMU.

(http://wiki.qemu.org/Features/KVM)

官方文档,意思是KVM项目以前fork了一个QEMU的镜像并称为qemu-kvm。现在所有不同的特征都被merge到QEMU的upstream了,称为qemu-kvm的fork版本暂停开发了。

暂时的结论

现在的qemu已经整合qemu-kvm,不再有qemu-kvm的说法了。一般创建x86的虚拟机需要用到qemu-system-x86_64这个命令,并需要加上–enable-kvm来支持kvm加速。有些Linux发行版的qemu-kvm命令仅仅是qemu-system-x86_64的软链接或者简单包装。

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