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Subject[RFC PATCH 01/35] Add XEN config options and disable unsupported config options.
The XEN config option is selected from the i386 subarch menu by
choosing the X86_XEN "Xen-compatible" subarch.

The XEN_SHADOW_MODE option defines the memory virtualization mode for
the kernel -- with it enabled, the kernel expects the hypervisor to
perform translation between pseudo-physical and machine addresses on
its behalf.

The disabled config options are:
- DOUBLEFAULT: are trapped by Xen and not virtualized
- HZ: defaults to 100 in Xen VMs
- Power management: not supported in unprivileged VMs
- SMP: not supported in this set of patches
- X86_{UP,LOCAL,IO}_APIC: not supported in unprivileged VMs

Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
arch/i386/Kconfig | 18 ++++++++++++++----
drivers/xen/Kconfig | 21 +++++++++++++++++++++
kernel/Kconfig.hz | 4 ++--
kernel/Kconfig.preempt | 1 +
4 files changed, 38 insertions(+), 6 deletions(-)

--- xen-subarch-2.6.orig/arch/i386/Kconfig
+++ xen-subarch-2.6/arch/i386/Kconfig
@@ -58,6 +58,12 @@ config X86_PC
help
Choose this option if your computer is a standard PC or compatible.

+config X86_XEN
+ bool "Xen-compatible"
+ help
+ Choose this option if you plan to run this kernel on top of the
+ Xen Hypervisor.
+
config X86_ELAN
bool "AMD Elan"
help
@@ -175,6 +181,7 @@ config HPET_EMULATE_RTC

config SMP
bool "Symmetric multi-processing support"
+ depends on !X86_XEN
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
@@ -230,7 +237,7 @@ source "kernel/Kconfig.preempt"

config X86_UP_APIC
bool "Local APIC support on uniprocessors"
- depends on !SMP && !(X86_VISWS || X86_VOYAGER)
+ depends on !SMP && !(X86_VISWS || X86_VOYAGER || X86_XEN)
help
A local APIC (Advanced Programmable Interrupt Controller) is an
integrated interrupt controller in the CPU. If you have a single-CPU
@@ -255,12 +262,12 @@ config X86_UP_IOAPIC

config X86_LOCAL_APIC
bool
- depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
+ depends on X86_UP_APIC || ((X86_VISWS || SMP) && !(X86_VOYAGER || X86_XEN))
default y

config X86_IO_APIC
bool
- depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
+ depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER || X86_XEN))
default y

config X86_VISWS_APIC
@@ -743,6 +750,7 @@ config HOTPLUG_CPU
config DOUBLEFAULT
default y
bool "Enable doublefault exception handler" if EMBEDDED
+ depends on !X86_XEN
help
This option allows trapping of rare doublefault exceptions that
would otherwise cause a system to silently reboot. Disabling this
@@ -753,7 +761,7 @@ endmenu


menu "Power management options (ACPI, APM)"
- depends on !X86_VOYAGER
+ depends on !(X86_VOYAGER || X86_XEN)

source kernel/power/Kconfig

@@ -1075,6 +1083,8 @@ source "security/Kconfig"

source "crypto/Kconfig"

+source "drivers/xen/Kconfig"
+
source "lib/Kconfig"

#
--- xen-subarch-2.6.orig/kernel/Kconfig.hz
+++ xen-subarch-2.6/kernel/Kconfig.hz
@@ -3,7 +3,7 @@
#

choice
- prompt "Timer frequency"
+ prompt "Timer frequency" if !XEN
default HZ_250
help
Allows the configuration of the timer frequency. It is customary
@@ -40,7 +40,7 @@ endchoice

config HZ
int
- default 100 if HZ_100
+ default 100 if HZ_100 || XEN
default 250 if HZ_250
default 1000 if HZ_1000

--- xen-subarch-2.6.orig/kernel/Kconfig.preempt
+++ xen-subarch-2.6/kernel/Kconfig.preempt
@@ -35,6 +35,7 @@ config PREEMPT_VOLUNTARY

config PREEMPT
bool "Preemptible Kernel (Low-Latency Desktop)"
+ depends on !XEN
help
This option reduces the latency of the kernel by making
all kernel code (that is not executing in a critical section)
--- /dev/null
+++ xen-subarch-2.6/drivers/xen/Kconfig
@@ -0,0 +1,21 @@
+#
+# This Kconfig describe xen options
+#
+
+mainmenu "Xen Configuration"
+
+config XEN
+ bool
+ default y if X86_XEN
+ help
+ This is the Linux Xen port.
+
+if XEN
+
+config XEN_SHADOW_MODE
+ bool
+ default y
+ help
+ Fakes out a shadow mode kernel
+
+endif
--
-
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