KVM: s390: add kvm to kconfig on s390

This patch adds the virtualization submenu and the kvm option to the kernel
config. It also defines HAVE_KVM for 64bit kernels.

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

2 files changed, 46 insertions, 0 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 513a0589e81d..9a742ce9cc92 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -73,6 +73,7 @@ config S390
         select HAVE_OPROFILE
         select HAVE_KPROBES
         select HAVE_KRETPROBES
+        select HAVE_KVM if 64BIT
 
 source "init/Kconfig"
 
@@ -540,3 +541,5 @@ source "security/Kconfig"
 source "crypto/Kconfig"
 
 source "lib/Kconfig"
+
+source "arch/s390/kvm/Kconfig"
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
new file mode 100644
index 000000000000..2489b341a00b
--- /dev/null
+++ b/arch/s390/kvm/Kconfig
@@ -0,0 +1,43 @@
+#
+# KVM configuration
+#
+config HAVE_KVM
+       bool
+
+menuconfig VIRTUALIZATION
+        bool "Virtualization"
+        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 && EXPERIMENTAL
+        select PREEMPT_NOTIFIERS
+        select ANON_INODES
+        select S390_SWITCH_AMODE
+        select PREEMPT
+        ---help---
+          Support hosting paravirtualized guest machines using the SIE
+          virtualization capability on the mainframe. This should work
+          on any 64bit machine.
+
+          This module provides access to the hardware capabilities through
+          a character device node named /dev/kvm.
+
+          To compile this as a module, choose M here: the module
+          will be called kvm.
+
+          If unsure, say N.
+
+# OK, it's a little counter-intuitive to do this, but it puts it neatly under
+# the virtualization menu.
+source drivers/virtio/Kconfig
+
+endif # VIRTUALIZATION