linux-kernel - RE: [PATCH v9 12/18] vfio: Register/unregister irq_bypass

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Date:	Mon, 21 Sep 2015 11:35:56 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>
CC:	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [PATCH v9 12/18] vfio: Register/unregister irq_bypass_producer



> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@...hat.com]
> Sent: Monday, September 21, 2015 5:32 PM
> To: Wu, Feng; alex.williamson@...hat.com; joro@...tes.org;
> mtosatti@...hat.com
> Cc: eric.auger@...aro.org; kvm@...r.kernel.org;
> iommu@...ts.linux-foundation.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v9 12/18] vfio: Register/unregister irq_bypass_producer
> 
> 
> 
> On 21/09/2015 10:56, Wu, Feng wrote:
> > Hi Paolo & Alex,
> >
> > I find that there is a build error in the following two cases:
> > - KVM is configured as 'M' and VFIO as 'Y'
> > The reason is the build of irqbypass manager is triggered in
> > arch/x86/kvm/Makefile, and VFIO is built before KVM, hence
> > it cannot find the symbols in irqbypass manager.
> >
> > - Disable KVM and enable VFIO in .config
> > The reason is similar with the above one, the irqbypass manager
> > is not built since KVM is not configured.
> >
> > I think the point is that we cannot trigger the build of irqbypass
> > manager inside KVM or VFIO, we need trigger the build at a high
> > level and it should be built before VFIO and KVM. Any ideas?
> 
> We can add virt/Makefile and build virt/lib/ directly, not through
> arch/x86/kvm.

Yes, that can solve the build error. Should I send a new version?

Thanks,
Feng

> 
> Paolo
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