linux-kernel - Re: [RFC v2 0/6] IRQ bypass manager and irqfd consumer

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Message-ID: <20150709153458.GX18569@8bytes.org>
Date:	Thu, 9 Jul 2015 17:34:58 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Eric Auger <eric.auger@...aro.org>, eric.auger@...com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, christoffer.dall@...aro.org,
	marc.zyngier@....com, avi.kivity@...il.com, mtosatti@...hat.com,
	feng.wu@...el.com, b.reynal@...tualopensystems.com,
	linux-kernel@...r.kernel.org, patches@...aro.org
Subject: Re: [RFC v2 0/6] IRQ bypass manager and irqfd consumer

On Thu, Jul 09, 2015 at 04:38:41PM +0200, Paolo Bonzini wrote:
> >> On Tue, Jul 07, 2015 at 11:17:48AM -0600, Alex Williamson wrote:
> > If we think that it's *only* a kvm-vfio interaction then we could add it
> > to virt/kvm/vfio.c.  vfio could use symbol_get to avoid a module
> > dependency and effectively disable the code path when not used with kvm.
> > The reverse model of hosting it in vfio and using symbol_get from
> > kvm-vfio would also work.  Do we really want to declare it to be
> > kvm-vfio specific though?  Another option would be to simply host it
> > under virt/lib with module dependencies for both vfio and kvm.
> 
> I wonder if in the future we may have some kind of driver-mediated
> passthrough, e.g. for network drivers.  They might use the bypass
> mechanism too.  So I think drivers/vfio is too restrictive.
> 
> virt/ right now only hosts KVM, but it could for example host lguest
> too.  virt/lib/ is okay with me.

Yeah, virt/lib is probably the best choice.


	Joerg

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