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

[KY Srinivasan]

> -----Original Message-----
> From: Jason Wang [mailto:jasowang@xxxxxxxxxx]
> Sent: Tuesday, July 23, 2013 5:41 AM
> To: tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; hpa@xxxxxxxxx; x86@xxxxxxxxxx;
> gleb@xxxxxxxxxx; pbonzini@xxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> 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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