Comment 8 for bug 929545

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Mark Baker (markashtonb) wrote : Re: PV Drivers for Ubuntu guests running on Hyper-V unable to control root device

From Microsoft:

Hyper-V detection code has been integrated with the kernel for sometime now:

Look at arch/x86/kernel/cpu/mshyperv.c. You can detect the presence of Hyper-V by examining the exported variable

/Mark