virtio: expose for non-virtualization users too

virtio has been so far used only in the context of virtualization,
and the virtio Kconfig was sourced directly by the relevant arch
Kconfigs when VIRTUALIZATION was selected.

Now that we start using virtio for inter-processor communications,
we need to source the virtio Kconfig outside of the virtualization
scope too.

Moreover, some architectures might use virtio for both virtualization
and inter-processor communications, so directly sourcing virtio
might yield unexpected results due to conflicting selections.

The simple solution offered by this patch is to always source virtio's
Kconfig in drivers/Kconfig, and remove it from the appropriate arch
Kconfigs. Additionally, a virtio menu entry has been added so virtio
drivers don't show up in the general drivers menu.

This way anyone can use virtio, though it's arguably less accessible
(and neat!) for virtualization users now.

Note: some architectures (mips and sh) seem to have a VIRTUALIZATION
menu merely for sourcing virtio's Kconfig, so that menu is removed too.
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

arch/ia64/kvm/Kconfig

@@ -49,6 +49,5 @@ config KVM_INTEL
 	  extensions.
 
 source drivers/vhost/Kconfig
-source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION

arch/mips/Kconfig

@@ -2493,20 +2493,4 @@ source "security/Kconfig"
 
 source "crypto/Kconfig"
 
-menuconfig VIRTUALIZATION
-	bool "Virtualization"
-	default n
-	---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
-
-source drivers/virtio/Kconfig
-
-endif # VIRTUALIZATION
-
 source "lib/Kconfig"

arch/powerpc/kvm/Kconfig

@@ -99,6 +99,5 @@ config KVM_E500
 	  If unsure, say N.
 
 source drivers/vhost/Kconfig
-source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION

arch/s390/kvm/Kconfig

@@ -37,6 +37,5 @@ config KVM
 # 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/virtio/Kconfig
 
 endif # VIRTUALIZATION

arch/sh/Kconfig

@@ -897,20 +897,4 @@ source "security/Kconfig"
 
 source "crypto/Kconfig"
 
-menuconfig VIRTUALIZATION
-	bool "Virtualization"
-	default n
-	---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
-
-source drivers/virtio/Kconfig
-
-endif # VIRTUALIZATION
-
 source "lib/Kconfig"

arch/tile/kvm/Kconfig

@@ -33,6 +33,5 @@ config KVM
 	  If unsure, say N.
 
 source drivers/vhost/Kconfig
-source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION

arch/x86/kvm/Kconfig

@@ -76,6 +76,5 @@ config KVM_MMU_AUDIT
 # the virtualization menu.
 source drivers/vhost/Kconfig
 source drivers/lguest/Kconfig
-source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION

drivers/Kconfig

@@ -112,6 +112,8 @@ source "drivers/uio/Kconfig"
 
 source "drivers/vlynq/Kconfig"
 
+source "drivers/virtio/Kconfig"
+
 source "drivers/xen/Kconfig"
 
 source "drivers/staging/Kconfig"

drivers/virtio/Kconfig

@@ -7,6 +7,8 @@ config VIRTIO_RING
 	tristate
 	depends on VIRTIO
 
+menu "Virtio drivers"
+
 config VIRTIO_PCI
 	tristate "PCI driver for virtio devices (EXPERIMENTAL)"
 	depends on PCI && EXPERIMENTAL
@@ -33,3 +35,4 @@ config VIRTIO_BALLOON
 
 	 If unsure, say M.
 
+endmenu