Re: [Xen-devel] [PATCH v2] xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests.

From: David Vrabel
Date: Wed Jul 09 2014 - 08:10:27 EST

On 08/07/14 21:52, konrad@xxxxxxxxxx wrote:
> From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> By default when CONFIG_XEN and CONFIG_XEN_PVHVM kernels are
> run, they will enable the PV extensions (drivers, interrupts, timers,
> etc) - which is perfect.

If it's "perfect" what's this option for? ;)

I think you mean to say "which is the best option for the majority of
use cases".

> However, in some cases (kexec not fully wokring, benchmarking)
> we want to disable Xen PV extensions. As such introduce the
> 'xen_nopv' parameter that will do it.


I'm unconvinced about the utility of this option. The resulting kernel
will go like molasses and I'm not sure what the use of being any to
benchmark a configuration no one will use in practice. But it's a small
patch so

Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>


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