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. _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
