linux-kernel - Re: [PATCH 1/2] x86 Kconfig: create x86/Kconfig.virt

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Date:	Tue, 14 Jan 2014 09:01:43 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Dave Hansen <dave@...1.net>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org, bp@...e.de,
	dtor@...are.com, kys@...rosoft.com, haiyangz@...rosoft.com,
	agraf@...e.de, gleb@...hat.com
Subject: Re: [PATCH 1/2] x86 Kconfig: create x86/Kconfig.virt

Il 14/01/2014 01:11, Dave Hansen ha scritto:
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> Right now, there is a "Enable paravirtualization code" option in
> the "Processor Features" menu, which means Xen.  There is also a
> group of host-side paravirtualization options specific to KVM
> under the top-level "Virtualization" menu.
> 
> I think it makes a lot of sense to group the host and guest side
> things together, especially since the top-level "Virtualization"
> menu is so sparsely populated.
> 
> This creates a new hypervisor-independent arch/x86/Kconfig.virt
> file, and moves the "Virtualization" menu to be defined in there.
> Currently CONFIG_VIRTUALIZATION really means "host-side", so
> create a new config option which matches the guest-side one, and
> default its value to be what CONFIG_VIRTUALIZATION was set to.
> 
> This also removes the very counterintuitive references to
> lguest/vhost code *from* kvm-specific code and removes the silly:
> 
> 	depends on HAVE_KVM || X86
> 
> dependency.  It makes zero sense to have entries defined in
> arch/x86 depend on x86.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Dmitry Torokhov <dtor@...are.com>
> Cc: K. Y. Srinivasan <kys@...rosoft.com>
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Alexander Graf <agraf@...e.de>
> Cc: Gleb Natapov <gleb@...hat.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> ---
> 
>  linux.git-davehans/arch/x86/Kconfig      |    2 +-
>  linux.git-davehans/arch/x86/Kconfig.virt |   25 +++++++++++++++++++++++++
>  linux.git-davehans/arch/x86/kvm/Kconfig  |   19 -------------------
>  3 files changed, 26 insertions(+), 20 deletions(-)
> 
> diff -puN arch/x86/Kconfig~x86-Kconfig-move-paravirt-under-virtualization arch/x86/Kconfig
> --- linux.git/arch/x86/Kconfig~x86-Kconfig-move-paravirt-under-virtualization	2014-01-13 16:09:29.785875796 -0800
> +++ linux.git-davehans/arch/x86/Kconfig	2014-01-13 16:09:29.793876157 -0800
> @@ -2416,6 +2416,6 @@ source "security/Kconfig"
>  
>  source "crypto/Kconfig"
>  
> -source "arch/x86/kvm/Kconfig"
> +source "arch/x86/Kconfig.virt"
>  
>  source "lib/Kconfig"
> diff -puN /dev/null arch/x86/Kconfig.virt
> --- /dev/null	2013-11-27 17:20:18.337162396 -0800
> +++ linux.git-davehans/arch/x86/Kconfig.virt	2014-01-13 16:09:29.793876157 -0800
> @@ -0,0 +1,25 @@
> +
> +menu "Virtualization"
> +
> +config VIRTUALIZATION
> +	bool
> +
> +config HYPERVISOR_HOST
> +	bool "Host-Side Features (Linux as the Hypervisor)"
> +	default y if VIRTUALIZATION
> +	---help---
> +	  Say Y here to get to see options for using your Linux host to run other
> +	  operating systems inside virtual machines (guests).
> +	  This option alone does not add any kernel code.
> +
> +	  If you say N, all options in this submenu will be skipped and disabled.
> +
> +if HYPERVISOR_HOST
> +
> +source arch/x86/kvm/Kconfig
> +source drivers/vhost/Kconfig
> +source drivers/lguest/Kconfig
> +
> +endif # HYPERVISOR_HOST
> +
> +endmenu # "Virtualization"
> diff -puN arch/x86/kvm/Kconfig~x86-Kconfig-move-paravirt-under-virtualization arch/x86/kvm/Kconfig
> --- linux.git/arch/x86/kvm/Kconfig~x86-Kconfig-move-paravirt-under-virtualization	2014-01-13 16:09:29.787875886 -0800
> +++ linux.git-davehans/arch/x86/kvm/Kconfig	2014-01-13 16:09:29.793876157 -0800
> @@ -4,19 +4,6 @@
>  
>  source "virt/kvm/Kconfig"
>  
> -menuconfig VIRTUALIZATION
> -	bool "Virtualization"
> -	depends on HAVE_KVM || X86
> -	default y
> -	---help---
> -	  Say Y here to get to see options for using your Linux host to run other
> -	  operating systems inside virtual machines (guests).
> -	  This option alone does not add any kernel code.
> -
> -	  If you say N, all options in this submenu will be skipped and disabled.
> -
> -if VIRTUALIZATION
> -
>  config KVM
>  	tristate "Kernel-based Virtual Machine (KVM) support"
>  	depends on HAVE_KVM
> @@ -93,9 +80,3 @@ config KVM_DEVICE_ASSIGNMENT
>  
>  	  If unsure, say Y.
>  
> -# OK, it's a little counter-intuitive to do this, but it puts it neatly under
> -# the virtualization menu.
> -source drivers/vhost/Kconfig
> -source drivers/lguest/Kconfig
> -
> -endif # VIRTUALIZATION
> _
> 

Acked-by: Paolo Bonzini <pbonzini@...hat.com>
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