how to find out if running inside KVM guest

Question

Is there a way to find out if OS(linux) is running inside KVM guest..

Answer 1

Grep dmesg, there should be at least one line containing kvm. On my machines:

[    0.000000] kvm-clock: cpu 0, msr 0:5dd801, boot clock
[    0.000000] kvm-clock: cpu 0, msr 0:1023801, primary cpu clock

Alternativly check /proc/cpuinfo, it contains a line:

model name : QEMU Virtual CPU version 0.9.1

But, the problem is: You can't be sure you are an KVM guest (on top of QEMU) or only a QEMU-Guest.

Answer 2

You can check if imvirt or virt-what which are available for several Linux distros, including Ubuntu, can help you.