[Xen-devel] [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

The XEN config option enables the Xen paravirt_ops interface, which is
installed when the kernel finds itself running under Xen. (By some
as-yet fully defined mechanism, implemented in a future patch.)

Xen is no longer a sub-architecture, so the X86_XEN subarch config
option has gone.

The disabled config options are:
- PREEMPT: Xen doesn't support it
- HZ: set to 100Hz for now, to cut down on VCPU context switch rate.
  This will be adapted to use tickless later.
- kexec: not yet supported

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       |    7 +++++--
 arch/i386/Kconfig.debug |    1 +
 arch/i386/xen/Kconfig   |   10 ++++++++++
 kernel/Kconfig.hz       |    4 ++--
 kernel/Kconfig.preempt  |    1 +
 5 files changed, 19 insertions(+), 4 deletions(-)

===================================================================
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -192,6 +192,8 @@ 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 ACPI_SRAT
        bool
@@ -298,12 +300,12 @@ config X86_UP_IOAPIC
 
 config X86_LOCAL_APIC
        bool
-       depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || 
X86_GENERICARCH
+       depends on X86_UP_APIC || (((X86_VISWS || SMP) && !X86_VOYAGER) || 
X86_GENERICARCH)
        default y
 
 config X86_IO_APIC
        bool
-       depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || 
X86_GENERICARCH
+       depends on X86_UP_IOAPIC || ((SMP && !(X86_VISWS || X86_VOYAGER)) || 
X86_GENERICARCH)
        default y
 
 config X86_VISWS_APIC
@@ -743,6 +745,7 @@ source kernel/Kconfig.hz
 
 config KEXEC
        bool "kexec system call"
+       depends on !XEN
        help
          kexec is a system call that implements the ability to shutdown your
          current kernel, and to start another kernel.  It is like a reboot
===================================================================
--- a/arch/i386/Kconfig.debug
+++ b/arch/i386/Kconfig.debug
@@ -79,6 +79,7 @@ config DOUBLEFAULT
 config DOUBLEFAULT
        default y
        bool "Enable doublefault exception handler" if EMBEDDED
+       depends on !XEN
        help
           This option allows trapping of rare doublefault exceptions that
           would otherwise cause a system to silently reboot. Disabling this
===================================================================
--- /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 PARAVIRT
+       default y
+       help
+         This is the Linux Xen port.
===================================================================
--- a/kernel/Kconfig.hz
+++ b/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
@@ -49,7 +49,7 @@ endchoice
 
 config HZ
        int
-       default 100 if HZ_100
+       default 100 if HZ_100 || XEN
        default 250 if HZ_250
        default 300 if HZ_300
        default 1000 if HZ_1000
===================================================================
--- a/kernel/Kconfig.preempt
+++ b/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)

-- 


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