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Date: Fri, 8 Apr 2016 12:42:48 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Sepherosa Ziehau <sephe@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r297699 - head/sys/dev/hyperv/vmbus
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On Fri, Apr 08, 2016 at 09:20:47AM +0000, Sepherosa Ziehau wrote:
> Author: sephe
> Date: Fri Apr  8 09:20:46 2016
> New Revision: 297699
> URL: https://svnweb.freebsd.org/changeset/base/297699
> 
> Log:
>   hyperv: Revert r297481
>   
>   Use vm_guest == VM_GUEST_HV is not enough to determine whether FreeBSD
>   is running on Hyper-V or not.  What a mess.

Can you explain why ?

VM_GUEST_HV is only set in inentify_hypervisor() when the vendor string
explicitely contained 'Microsoft Hv'.  How can this be mis-interpreted
to be a Xen id ?