linux 查看cpu是否支持虚拟化
一、Windows平台：
使用cpu-Z即可查看。
二、Linux平台：
在终端执行#cat /proc/cpuinfo（或#grep -E '(vmx|svm)' /proc/cpuinfo）命令，找到flags部分，如果其中输出有VMX或SVM，即表明支持虚拟化技术。
三、 Linux显示的flags部分解释：
fpu Onboard FPU
vme Virtual Mode Extensions
de Debugging Extensions
pse Page Size Extensions
tsc Time Stamp Counter
msr Model-Specific Registers
pae Physical Address Extensions
mce Machine Check Architecture
cx8 CMPXCHG8 instruction
apic Onboard APIC
sep SYSENTER/SYSEXIT
mtrr Memory Type Range Registers
pge Page Global Enable
mca Machine Check Architecture
cmov CMOV instructions (plus FCMOVcc, FCOMI with FPU)
pat Page Attribute Table
pse36 36-bit PSEs
pn Processor serial number
clflush CLFLUSH instruction
dts Debug Store
acpi ACPI via MSR
mmx Multimedia Extensions
fxsr FXSAVE/FXRSTOR, CR4.OSFXSR
sse SSE
sse2 SSE2
ss CPU self snoop
ht Hyper-Threading
tm Automatic clock control
ia64 IA-64 processor
pbe Pending Break Enable
syscall SYSCALL/SYSRET
mp MP Capable
nx Execute Disable
mmxext AMD MMX extensions
fxsr_opt FXSAVE/FXRSTOR optimizations
pdpe1gb GB pages
rdtscp RDTSCP
lm Long Mode (x86-64)
3dnowext AMD 3DNow! extensions
3dnow 3DNow!
k8 Opteron, Athlon64
k7 Athlon
constant_tsc TSC ticks at a constant rate
up smp kernel running on up
pebs Precise-Event Based Sampling
bts Branch Trace Store
nonstop_tsc TSC does not stop in C states
pni SSE-3
pclmulqdq PCLMULQDQ instruction
dtes64 64-bit Debug Store
monitor Monitor/Mwait support
ds_cpl CPL Qual. Debug Store
vmx Hardware virtualization //intel的虚拟化技术VT技术
smx Safer mode
est Enhanced SpeedStep
tm2 Thermal Monitor 2
ssse3 Supplemental SSE-3
cid Context ID
fma Fused multiply-add
cx16 CMPXCHG16B
xptr Send Task Priority Messages
pdcm Performance Capabilities
dca Direct Cache Access
sse4_1 SSE-4.1
sse4_2 SSE-4.2
x2apic x2APIC
aes AES instructions
xsave XSAVE/XRSTOR/XSETBV/XGETBV
avx Advanced Vector Extensions
hypervisor Running on a hypervisor
lahf_lm LAHF/SAHF in long mode
cmp_legacy If yes HyperThreading not valid
svm Secure virtual machine //AMD的虚拟化技术AMD-V
extapic Extended APIC space
cr8legacy CR8 in 32-bit mode
abm Advanced bit manipulation
sse4a SSE-4A
ibs Instruction Based Sampling
sse5 SSE-5
skinit SKINIT/STGI instructions
wdt Watchdog timer
是因为selinux的事
vi /etc/systemconfig/selinux
设置SELINUX=disabled
重启 就好了 2 楼 doloveme 2012-01-31 为了更好的体验KVM，更换了系统Fedora14，进入系统后使用qemu-kvm命令、virt-manager图形化界面以及virt-install命令（后两者依赖libvirt库）创建虚拟机都没有问题。
后来我重新编译安装了 qemu-kvm(qemu-kvm-0.14.0):
①./configure --prefix=/usr/local/kvm --enable-kvm
②make
③make install
④创建链接:
rm -f /usr/bin/qemu-img
rm -f /usr/bin/qemu-io
rm -f /usr/bin/qemu-nbd
rm -f /usr/bin/qemu
rm -f /usr/bin/kvm
rm -f /usr/bin/qemu-kvm
ln -s /usr/local/kvm/bin/qemu-img /usr/bin/qemu-img
ln -s /usr/local/kvm/bin/qemu-io /usr/bin/qemu-io
ln -s /usr/local/kvm/bin/qemu-nbd /usr/bin/qemu-nbd
ln -s /usr/local/kvm/bin/qemu-system-x86_64 /usr/bin/qemu
ln -s /usr/local/kvm/bin/qemu-system-x86_64 /usr/bin/kvm
ln -s /usr/local/kvm/bin/qemu-system-x86_64 /usr/bin/qemu-kvm
ln -s /usr/local/kvm/bin/qemu-system-x86_64 /usr/bin/qemu-system-x86_64
这时再用qemu-kvm命令创建虚拟机时没有问题，但是使用virt-manager&&virt-install创建虚拟机时，就出提示“Unable to complete install '<class 'libvirt.libvirtError'> internal error unable to start guest: libvir: error : cannot execute binary /usr/bin/qemu-kvm: Permission denied”这样的错误。也就是说qemu-kvm命令没有问题，但使用libvirt库的virt-manager及virt-install却有问题，那么问题肯定出在libivrt身上。通过调研（https://bugzilla.redhat.com /show_bug.cgi?format=multiple&id=523956）得知，这跟selinux有关，但具体原因还不太清楚。
解决方法：关闭selinux（/etc/selinux/config中SELINUX项设为disabled），重启系统，搞定～