KVM: Move common KVM Kconfig items to new file virt/kvm/Kconfig

Reduce Kconfig code duplication.

Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/ia64/kvm/Kconfig b/arch/ia64/kvm/Kconfig
index 64d5209..f922bbb 100644
--- a/arch/ia64/kvm/Kconfig
+++ b/arch/ia64/kvm/Kconfig
@@ -1,12 +1,8 @@
 #
 # KVM configuration
 #
-config HAVE_KVM
-	bool
 
-config HAVE_KVM_IRQCHIP
-       bool
-       default y
+source "virt/kvm/Kconfig"
 
 menuconfig VIRTUALIZATION
 	bool "Virtualization"
@@ -28,6 +24,7 @@
 	depends on PCI
 	select PREEMPT_NOTIFIERS
 	select ANON_INODES
+	select HAVE_KVM_IRQCHIP
 	---help---
 	  Support hosting fully virtualized guest machines using hardware
 	  virtualization extensions.  You will need a fairly recent
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 5a152a5..46019dc 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -2,8 +2,7 @@
 # KVM configuration
 #
 
-config HAVE_KVM_IRQCHIP
-       bool
+source "virt/kvm/Kconfig"
 
 menuconfig VIRTUALIZATION
 	bool "Virtualization"
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 3e260b7..ad75ce3 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -1,11 +1,7 @@
 #
 # KVM configuration
 #
-config HAVE_KVM
-       bool
-
-config HAVE_KVM_IRQCHIP
-       bool
+source "virt/kvm/Kconfig"
 
 menuconfig VIRTUALIZATION
 	bool "Virtualization"
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 8600a09..939b1cb 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -1,12 +1,8 @@
 #
 # KVM configuration
 #
-config HAVE_KVM
-       bool
 
-config HAVE_KVM_IRQCHIP
-       bool
-       default y
+source "virt/kvm/Kconfig"
 
 menuconfig VIRTUALIZATION
 	bool "Virtualization"
@@ -29,6 +25,7 @@
 	select PREEMPT_NOTIFIERS
 	select MMU_NOTIFIER
 	select ANON_INODES
+	select HAVE_KVM_IRQCHIP
 	---help---
 	  Support hosting fully virtualized guest machines using hardware
 	  virtualization extensions.  You will need a fairly recent
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
new file mode 100644
index 0000000..79e83fc
--- /dev/null
+++ b/virt/kvm/Kconfig
@@ -0,0 +1,7 @@
+# KVM common configuration items and defaults
+
+config HAVE_KVM
+       bool
+
+config HAVE_KVM_IRQCHIP
+       bool