> -----Original Message-----
> From: Jason Wang [mailto:jasow...@redhat.com]
> Sent: Tuesday, July 23, 2013 5:41 AM
> To: t...@linutronix.de; mi...@redhat.com; h...@zytor.com; x...@kernel.org;
> g...@redhat.com; pbonz...@redhat.com; k...@vger.kernel.org; linux-
> ker...@vger.kernel.org
> Cc: Jason Wang; KY Srinivasan
> Subject: [PATCH 4/4] x86: properly handle kvm emulation of hyperv
> 
> Recent kvm has some basic support of hyperv, this will cause the guest to
> identify itself as running on top of hyperv instead of kvm which will disable
> kvm pv functionality. This is because we try to detect hyperv before kvm. 
> Solve
> this by simply checking kvm in detect_hypervisor() first.
> 

This strategy of hypervisor detection based on some detection order IMHO is not
a robust detection strategy. The current scheme works since the only hypervisor 
emulated
(by other hypervisors happens to be Hyper-V). What if this were to change.

Regards,

K. Y



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