How do I detect Xen in a Python script? -


i need determine when python script running in xen virtual machine. vm running linux.

i can't find obvious in platform module. closest can appearance of 'xen' in platform.platform()

>>> platform.platform() 'linux-2.6.18-194.el5xen-x86_64-with-redhat-5.5-final'

what best way determine this?

thanks.

fyi, if paravirtual vm, there should /proc/xen/capabilities file. if contents "control_d" then, running under dom0 else , running on domu.
dont rely on kernel version. if vm compiled custom kernel or different kernel version or modern day pv-ops kernel (which has no "xen" string in it, unlike redhat's kernel), code wont work.

on other hand, there other nifty tricks. cpuid instruction 1 such example. dont know how in python, if set eax 1 , call cpuid, bit 31 of ecx have answer. if set, running on hypervisor. else, not. works 64bit platforms.


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