linux-kernel - Re: [PATCH RFC 0/4] Paravirt-spinlock implementation for KVM guests (Version 0)

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Message-ID: <20100728224229.GA1693@phenom.dumpdata.com>
Date:	Wed, 28 Jul 2010 18:42:29 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	avi@...hat.com, Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, linux-kernel@...r.kernel.org,
	npiggin@...e.de, Jeremy Fitzhardinge <jeremy@...p.org>,
	kvm@...r.kernel.org, bharata@...ibm.com,
	Balbir Singh <balbir@...ibm.com>,
	Jan Beulich <JBeulich@...ell.com>
Subject: Re: [PATCH RFC 0/4] Paravirt-spinlock implementation for KVM guests
 (Version 0)

On Wed, Jul 28, 2010 at 06:10:59PM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Jul 26, 2010 at 11:41:50AM +0530, Srivatsa Vaddagiri wrote:
> > This patch-series implements paravirt-spinlock implementation for KVM guests,
> > based heavily on Xen's implementation. I tried to refactor Xen's spinlock
> > implementation to make it common for both Xen and KVM - but found that 
> > few differences between Xen and KVM (Xen has the ability to block on a
> > particular event/irq for example) _and_ the fact that the guest kernel 
> > can be compiled to support both Xen and KVM hypervisors (CONFIG_XEN and
> > CONFIG_KVM_GUEST can both be turned on) makes the "common" code a eye-sore.
> > There will have to be:
> > 
> > 	if (xen) {
> > 		...
> > 	} else if (kvm) {
> > 		..
> > 	}
> > 
> > or possibly:
> > 
> > 	alternative(NOP, some_xen_specific_call, ....)
> 
> Why not utilize the pvops path?

Duh. You did use it. Sorry about the noise.
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