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>

9 files changed, 5 insertions, 37 deletions

diff --git a/arch/ia64/kvm/Kconfig b/arch/ia64/kvm/Kconfig
index fa4d1e59deb0..9806e55f91be 100644
--- a/arch/ia64/kvm/Kconfig
+++ b/arch/ia64/kvm/Kconfig
@@ -49,6 +49,5 @@ config KVM_INTEL
           extensions.
 
 source drivers/vhost/Kconfig
-source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 6cb60adb7b30..177cdaf83564 100644
--- a/arch/mips/Kconfig
+++ b/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"
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index b7baff78f90c..105b6918b23e 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/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
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index f66a1bdbb61d..a21634173a66 100644
--- a/arch/s390/kvm/Kconfig
+++ b/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
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index bbdeb48bbf8e..748ff1920068 100644
--- a/arch/sh/Kconfig
+++ b/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"
diff --git a/arch/tile/kvm/Kconfig b/arch/tile/kvm/Kconfig
index b88f9c047781..669fcdba31ea 100644
--- a/arch/tile/kvm/Kconfig
+++ b/arch/tile/kvm/Kconfig
@@ -33,6 +33,5 @@ config KVM
           If unsure, say N.
 
 source drivers/vhost/Kconfig
-source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 50f63648ce1b..65cf8233d25c 100644
--- a/arch/x86/kvm/Kconfig
+++ b/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
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 52e306dd5010..9e7a4f5b5c2e 100644
--- a/drivers/Kconfig
+++ b/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"
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 3dd6294d10b6..57e493b1bd20 100644
--- a/drivers/virtio/Kconfig
+++ b/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