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    SubjectRE: [PATCH v9 12/18] vfio: Register/unregister irq_bypass_producer
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    > -----Original Message-----
    > From: Paolo Bonzini [mailto:pbonzini@redhat.com]
    > Sent: Monday, September 21, 2015 5:32 PM
    > To: Wu, Feng; alex.williamson@redhat.com; joro@8bytes.org;
    > mtosatti@redhat.com
    > Cc: eric.auger@linaro.org; kvm@vger.kernel.org;
    > iommu@lists.linux-foundation.org; linux-kernel@vger.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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