RE: [PATCH 4/4] x86: properly handle kvm emulation of hyperv

KY Srinivasan
2013-07-23T13:55:17Z

> -----Original Message-----
> From: Jason Wang [mailto:jasowang@redhat.com]
> Sent: Tuesday, July 23, 2013 5:41 AM
> To: tglx@linutronix.de; mingo@redhat.com; hpa@zytor.com; x86@kernel.org;
> gleb@redhat.com; pbonzini@redhat.com; kvm@vger.kernel.org; linux-
> kernel@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