下载安装：
wget http://wiki.qemu-project.org/download/qemu-2.0.0.tar.bz2
tar xjvf qemu-2.0.0.tar.bz2 //git clone git://git.qemu-project.org/qemu.git
cd qemu-2.0.0
./configure --enable-kvm --enable-debug --enable-vnc --enable-werror --target-list="x86_64-softmmu"
make -j8
make install
说明:
--enable-kvm：编译KVM模块，使QEMU可以利用KVM来访问硬件提供的虚拟化服务。
--enable-vnc：启用VNC。
--enalbe-werror：编译时，将所有的警告当作错误处理。
--target-list：选择目标机器的架构。默认是将所有的架构都编译，但为了更快的完成编译，指定需要的架构即可。
[root@server-mysql qemu-2.0.0]# ./configure --help
Usage: configure [options]
Options: [defaults in brackets after descriptions]
Standard options:
--help print this message
--prefix=PREFIX install in PREFIX [/usr/local]
--interp-prefix=PREFIX where to find shared libraries, etc.
use %M for cpu name [/usr/gnemul/qemu-%M]
--target-list=LIST set target list (default: build everything)
Available targets: aarch64-softmmu alpha-softmmu
arm-softmmu cris-softmmu i386-softmmu lm32-softmmu
m68k-softmmu microblazeel-softmmu microblaze-softmmu
mips64el-softmmu mips64-softmmu mipsel-softmmu
mips-softmmu moxie-softmmu or32-softmmu
ppc64-softmmu ppcemb-softmmu ppc-softmmu
s390x-softmmu sh4eb-softmmu sh4-softmmu
sparc64-softmmu sparc-softmmu unicore32-softmmu
x86_64-softmmu xtensaeb-softmmu xtensa-softmmu
aarch64-linux-user alpha-linux-user armeb-linux-user
arm-linux-user cris-linux-user i386-linux-user
m68k-linux-user microblazeel-linux-user
microblaze-linux-user mips64el-linux-user
mips64-linux-user mipsel-linux-user mips-linux-user
mipsn32el-linux-user mipsn32-linux-user
or32-linux-user ppc64abi32-linux-user
ppc64-linux-user ppc-linux-user s390x-linux-user
sh4eb-linux-user sh4-linux-user
sparc32plus-linux-user sparc64-linux-user
sparc-linux-user unicore32-linux-user
x86_64-linux-user
Advanced options (experts only):
--source-path=PATH path of source code [/root/qemu-2.0.0]
--cross-prefix=PREFIX use PREFIX for compile tools []
--cc=CC use C compiler CC [cc]
--iasl=IASL use ACPI compiler IASL [iasl]
--host-cc=CC use C compiler CC [cc] for code run at
build time
--cxx=CXX use C++ compiler CXX [c++]
--objcc=OBJCC use Objective-C compiler OBJCC [cc]
--extra-cflags=CFLAGS append extra C compiler flags QEMU_CFLAGS
--extra-ldflags=LDFLAGS append extra linker flags LDFLAGS
--make=MAKE use specified make [make]
--install=INSTALL use specified install [install]
--python=PYTHON use specified python [python -B]
--smbd=SMBD use specified smbd [/usr/sbin/smbd]
--static enable static build [no]
--mandir=PATH install man pages in PATH
--datadir=PATH install firmware in PATH/qemu
--docdir=PATH install documentation in PATH/qemu
--bindir=PATH install binaries in PATH
--libdir=PATH install libraries in PATH
--sysconfdir=PATH install config in PATH/qemu
--localstatedir=PATH install local state in PATH (set at runtime on win32)
--with-confsuffix=SUFFIX suffix for QEMU data inside datadir/libdir/sysconfdir [/qemu]
--enable-modules enable modules support
--enable-debug-tcg enable TCG debugging
--disable-debug-tcg disable TCG debugging (default)
--enable-debug-info enable debugging information (default)
--disable-debug-info disable debugging information
--enable-debug enable common debug build options
--enable-sparse enable sparse checker
--disable-sparse disable sparse checker (default)
--disable-strip disable stripping binaries
--disable-werror disable compilation abort on warning
--disable-stack-protector disable compiler-provided stack protection
--disable-sdl disable SDL
--enable-sdl enable SDL
--with-sdlabi select preferred SDL ABI 1.2 or 2.0
--disable-gtk disable gtk UI
--enable-gtk enable gtk UI
--disable-virtfs disable VirtFS
--enable-virtfs enable VirtFS
--disable-vnc disable VNC
--enable-vnc enable VNC
--disable-cocoa disable Cocoa (Mac OS X only)
--enable-cocoa enable Cocoa (default on Mac OS X)
--audio-drv-list=LIST set audio drivers list:
Available drivers: oss alsa sdl esd pa fmod
--block-drv-whitelist=L Same as --block-drv-rw-whitelist=L
--block-drv-rw-whitelist=L
set block driver read-write whitelist
(affects only QEMU, not qemu-img)
--block-drv-ro-whitelist=L
set block driver read-only whitelist
(affects only QEMU, not qemu-img)
--disable-xen disable xen backend driver support
--enable-xen enable xen backend driver support
--disable-xen-pci-passthrough
--enable-xen-pci-passthrough
--disable-brlapi disable BrlAPI
--enable-brlapi enable BrlAPI
--disable-vnc-tls disable TLS encryption for VNC server
--enable-vnc-tls enable TLS encryption for VNC server
--disable-vnc-sasl disable SASL encryption for VNC server
--enable-vnc-sasl enable SASL encryption for VNC server
--disable-vnc-jpeg disable JPEG lossy compression for VNC server
--enable-vnc-jpeg enable JPEG lossy compression for VNC server
--disable-vnc-png disable PNG compression for VNC server (default)
--enable-vnc-png enable PNG compression for VNC server
--disable-vnc-ws disable Websockets support for VNC server
--enable-vnc-ws enable Websockets support for VNC server
--disable-curses disable curses output
--enable-curses enable curses output
--disable-curl disable curl connectivity
--enable-curl enable curl connectivity
--disable-fdt disable fdt device tree
--enable-fdt enable fdt device tree
--disable-bluez disable bluez stack connectivity
--enable-bluez enable bluez stack connectivity
--disable-slirp disable SLIRP userspace network connectivity
--disable-kvm disable KVM acceleration support
--enable-kvm enable KVM acceleration support
--disable-rdma disable RDMA-based migration support
--enable-rdma enable RDMA-based migration support
--enable-tcg-interpreter enable TCG with bytecode interpreter (TCI)
--enable-system enable all system emulation targets
--disable-system disable all system emulation targets
--enable-user enable supported user emulation targets
--disable-user disable all user emulation targets
--enable-linux-user enable all linux usermode emulation targets
--disable-linux-user disable all linux usermode emulation targets
--enable-bsd-user enable all BSD usermode emulation targets
--disable-bsd-user disable all BSD usermode emulation targets
--enable-guest-base enable GUEST_BASE support for usermode
emulation targets
--disable-guest-base disable GUEST_BASE support
--enable-pie build Position Independent Executables
--disable-pie do not build Position Independent Executables
--fmod-lib path to FMOD library
--fmod-inc path to FMOD includes
--oss-lib path to OSS library
--enable-uname-release=R Return R for uname -r in usermode emulation
--cpu=CPU Build for host CPU [x86_64]
--disable-uuid disable uuid support
--enable-uuid enable uuid support
--disable-vde disable support for vde network
--enable-vde enable support for vde network
--disable-netmap disable support for netmap network
--enable-netmap enable support for netmap network
--disable-linux-aio disable Linux AIO support
--enable-linux-aio enable Linux AIO support
--disable-cap-ng disable libcap-ng support
--enable-cap-ng enable libcap-ng support
--disable-attr disables attr and xattr support
--enable-attr enable attr and xattr support
--disable-blobs disable installing provided firmware blobs
--enable-docs enable documentation build
--disable-docs disable documentation build
--disable-vhost-net disable vhost-net acceleration support
--enable-vhost-net enable vhost-net acceleration support
--enable-trace-backend=B Set trace backend
Available backends: nop, stderr, dtrace, simple, ust, ftrace
--with-trace-file=NAME Full PATH,NAME of file to store traces
Default:trace-<pid>
--disable-spice disable spice
--enable-spice enable spice
--enable-rbd enable building the rados block device (rbd)
--disable-libiscsi disable iscsi support
--enable-libiscsi enable iscsi support
--disable-libnfs disable nfs support
--enable-libnfs enable nfs support
--disable-smartcard-nss disable smartcard nss support
--enable-smartcard-nss enable smartcard nss support
--disable-libusb disable libusb (for usb passthrough)
--enable-libusb enable libusb (for usb passthrough)
--disable-usb-redir disable usb network redirection support
--enable-usb-redir enable usb network redirection support
--enable-lzo enable the support of lzo compression library
--enable-snappy enable the support of snappy compression library
--disable-guest-agent disable building of the QEMU Guest Agent
--enable-guest-agent enable building of the QEMU Guest Agent
--with-vss-sdk=SDK-path enable Windows VSS support in QEMU Guest Agent
--with-win-sdk=SDK-path path to Windows Platform SDK (to build VSS .tlb)
--disable-seccomp disable seccomp support
--enable-seccomp enables seccomp support
--with-coroutine=BACKEND coroutine backend. Supported options:
gthread, ucontext, sigaltstack, windows
--disable-coroutine-pool disable coroutine freelist (worse performance)
--enable-coroutine-pool enable coroutine freelist (better performance)
--enable-glusterfs enable GlusterFS backend
--disable-glusterfs disable GlusterFS backend
--enable-gcov enable test coverage analysis with gcov
--gcov=GCOV use specified gcov [gcov]
--enable-tpm enable TPM support
--disable-libssh2 disable ssh block device support
--enable-libssh2 enable ssh block device support
--disable-vhdx disables support for the Microsoft VHDX image format
--enable-vhdx enable support for the Microsoft VHDX image format
--disable-quorum disable quorum block filter support
--enable-quorum enable quorum block filter support
命令行创建及启动虚拟机
1.使用qemu-img创建虚拟机镜像。虚拟机镜像用来模拟虚拟机的硬盘，在启动虚拟机之前需要创建镜像文件。
qemu-img create -f qcow2 fedora.img 1G
fedora.img
-f选项用于指定镜像的格式，qcow2格式是QEMU最常用的镜像格式，采用来写时复制技术来优化性能。fedora.img是镜像文件的名字，10G是镜像文件大小。镜像文件创建完成后，可使用qemu-system-x86来启动x86架构的虚拟机
安装KVM模块.加速虚拟机
检查KVM是否可用：
QEMU使用KVM来提升虚拟机性能，如果不启用KVM会导致性能损失。要使用KVM，首先要检查硬件是否有虚拟化支持：
grep -E 'vmx|svm' /proc/cpuinfo
如果有输出则表示硬件有虚拟化支持。其次要检查kvm模块是否已经加载：
[root@server]lsmod | grep kvm
kvm_intel 142999 0
kvm 444314 1 kvm_intel
如果kvm_intel/kvm_amd、kvm模块被显示出来，则kvm模块已经加载。
最好要确保qemu在编译的时候使能了KVM，即在执行configure脚本的时候加入了–enable-kvm选项。
启动虚拟机安装操作系统
执行下面的命令启动带有cdrom的虚拟机：
[root@server-mysql ~]# qemu-system-x86_64 -m 50 fedora.img -cdrom ./ReactOS-LiveCD.iso
-m 指定虚拟机内存大小，默认单位是MB，
-enable-kvm使用KVM进行加速，
-cdrom添加fedora的安装镜像。可在弹出的窗口中操作虚拟机，安装操作系统，安装完成后重起虚拟机便会从硬盘(fedora.img)启动。
之后再启动虚拟机只需要执行：
[root@server-mysql ~]#qemu-system-x86_64 -m 50m fedora.img
图形官理界面:virt-manager
Minimum version requirements of major components:
python >= 2.7
gtk3 >= 3.14
libvirt-python >= 0.6.0
pygobject3 >= 3.14
libosinfo >= 0.2.10
安装：
python setup.py install
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