The XEN config option enables the Xen paravirt_ops interface, which is
installed when the kernel finds itself running under Xen.
Xen is no longer a sub-architecture, so the X86_XEN subarch config
option has gone.
Xen is currently incompatible with:
- PREEMPT
- HZ: set to 100Hz for now, to cut down on VCPU context switch rate.
 This will be adapted to use tickless later.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Signed-off-by: Ian Pratt <ian.pratt@xxxxxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 arch/i386/Kconfig | 2 ++
 arch/i386/xen/Kconfig | 10 ++++++++++
 2 files changed, 12 insertions(+)
===================================================================
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -216,6 +216,8 @@ config PARAVIRT
 under a hypervisor, improving performance significantly.
 However, when run without a hypervisor the kernel is
 theoretically slower. If in doubt, say N.
+
+source "arch/i386/xen/Kconfig"
 
 config VMI
 bool "VMI Paravirt-ops support"
===================================================================
--- /dev/null
+++ b/arch/i386/xen/Kconfig
@@ -0,0 +1,10 @@
+#
+# This Kconfig describes xen options
+#
+
+config XEN
+ bool "Enable support for Xen hypervisor"
+ depends on PARAVIRT && HZ_100 && !PREEMPT && !NO_HZ
+ default y
+ help
+ This is the Linux Xen port.
-- 
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