linux-kernel - Re: [KVM PATCH] KVM: introduce "xinterface" API for external interaction with guests

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Date:	Thu, 16 Jul 2009 17:30:19 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	glommer@...hat.com, aliguori@...ibm.com
Subject: Re: [KVM PATCH] KVM: introduce "xinterface" API for external
	interaction with guests

> diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
> index ad8ec35..9f50cc3 100644
> --- a/arch/x86/Kbuild
> +++ b/arch/x86/Kbuild
> @@ -1,5 +1,7 @@
>  
> -obj-$(CONFIG_KVM) += kvm/
> +ifdef CONFIG_KVM
> +obj-y += kvm/
> +endif

What was wrong with the old version?
If this is because xinterface.o is builtin to the kernel then we should
always visit kvm/ and use:

   obj-y += kvm/

unconditionally.



>  
>  # Xen paravirtualization support
>  obj-$(CONFIG_XEN) += xen/
> diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
> index afaaa76..80d951d 100644
> --- a/arch/x86/kvm/Makefile
> +++ b/arch/x86/kvm/Makefile
> @@ -17,3 +17,7 @@ kvm-amd-y		+= svm.o
>  obj-$(CONFIG_KVM)	+= kvm.o
>  obj-$(CONFIG_KVM_INTEL)	+= kvm-intel.o
>  obj-$(CONFIG_KVM_AMD)	+= kvm-amd.o
> +
> +ifdef CONFIG_KVM
> +obj-y += $(addprefix ../../../virt/kvm/, xinterface.o)
> +endif
And when we always visit kvm/ the above code snippet makes sense.
Before we never visited kvm/ unless CONFIG_KVM was defined.

	Sam
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