On Fri, Apr 08, 2016 at 11:03:46AM +0000, Dexuan Cui wrote: > Hi smokehydration, > I guess your VM config file has something like "viridian = 1" or > "viridian_enlightenment=xxx". > > With this, Xen tries to pretend to be Hyper-V, but obviously Xen can't be 100% Hyper-V. > BTW, I know at least KVM can have the same behavior. > > We have to find a reliable way to distinguish Hyper-V from other hypervisors that > try to pretend to be Hyper-V... At the time when the probe is done, the IDT entries for exceptions are already set. You can use rdmsr_safe() instead of rdmsr() to read Hyper-V timecounter register. Then, a fault definitely indicates that the kernel is not executing on the compatible Hyper-V emulator. Hopefully, a non-fault read is not impossible for undesired cases.Received on Fri Apr 08 2016 - 12:02:18 UTC
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