Am 04.08.2017 um 12:23 schrieb Paolo Bonzini: > 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.
You mean the kvm kernel module? Or can I access this register also from Qemu on any call that is handled in userspace? It would be easier to have a cmdline option to Qemu than an option to a kernel module. > Warning, I don't know if UEFI firmware uses CR8. UEFI firmware is not important in this case. Do you know if FreeBSD, OpenBSD or NetBSD use it? Thank for your ideas, Peter