linux-kernel - Re: [PATCH] kvm-vfio: do not use module

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Message-ID: <20140924114435.GD28823@arm.com>
Date:	Wed, 24 Sep 2014 12:44:36 +0100
From:	Will Deacon <will.deacon@....com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Gleb Natapov <gleb@...nel.org>,
	Alex Williamson <Alex.Williamson@...hat.com>
Subject: Re: [PATCH] kvm-vfio: do not use module_init

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!

> 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...

Will
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