Re: [PATCH] kvm-vfio: do not use module_init

From: Will Deacon
Date: Wed Sep 24 2014 - 07:48:17 EST

On Wed, Sep 24, 2014 at 12:45:53PM +0100, Paolo Bonzini wrote:
> Il 24/09/2014 13:44, Will Deacon ha scritto:
> > On Wed, Sep 24, 2014 at 12:29:09PM +0100, Paolo Bonzini wrote:
> >> /me got confused between the kernel and QEMU. In the kernel, you can
> >> only have one module_init function, and it will prevent unloading the
> >> module unless you also have the corresponding module_exit function.
> >
> > Happy for you to take the blame, but I think this one's my fault!
> That's why you were CCed! ;)
> >> So, commit 80ce1639727e (KVM: VFIO: register kvm_device_ops dynamically,
> >> 2014-09-02) broke unloading of the kvm module, by adding a module_init
> >> function and no module_exit.
> >
> > I forget kvm builds as a module for other architectures (ie. not arm/arm64).
> >
> >> Repair it by making kvm_vfio_ops_init weak, and checking it in
> >> kvm_init.
> >
> > Hehe, if only there was a kconfig option for kvm-vfio.c...
> Yeah, I was tempted to put it back. What do you think?

I think it's nicer than the __weak symbol and I don't see a downside to
having the option (the reason for removing it was lack of users, which
lasted a couple of hours).

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