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Most current hypervisors that run on Intel hardware use CPUID leaves 0x40000000 et seq. to pass information about the hypervisor from host to guest. KVM, Xen, VMware and Hyper-V all use this method. This is in addition to the hypervisor feature flag set in CPUID leaf 0x1, which indicates that the machine is a virtual machine. It's therefore trivial for a ...

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