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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 4 Aug 2017 12:23:38 +0200
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Subject: Re: [Qemu-devel] Prohibit Windows from running in QEMU
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To: Peter Lieven <pl@kamp.de>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On 04/08/2017 11:58, Peter Lieven wrote:
> Am 29.10.2013 um 10:59 schrieb Paolo Bonzini:
>> Il 29/10/2013 10:48, Peter Lieven ha scritto:
>>> Hi all,
>>>
>>> this question might seem a bit weird, but does anyone see a good way to
>>> avoid
>>> that Windows is able to boot inside qemu?
>>>
>>> We have defined several profiles for different operation systems and I want
>>> to avoid that someone chooses Linux and then installs Windows within
>>> a VM. Reason is licensing.
>> Patch QEMU to crash when Hyper-V extensions are enabled...
> 
> Hi all,
> 
> this is an old topic that has become important for me again recently.
> Now all Linux versions should be able to detect KVM even if Hyper-V is enabled.
> 
> But how do I detect from Qemu userspace that Hyper-V is enabled?

Maybe a better one: make KVM crash the guest if CR8 is nonzero on a
vmexit.  Linux doesn't use it, Windows should not survive long.
Warning, I don't know if UEFI firmware uses CR8.

Paolo