WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

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

To: Andi Kleen <ak@xxxxxx>
Subject: [Xen-devel] [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 13 Feb 2007 14:17:43 -0800
Cc: Andrew Morton <akpm@xxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Delivery-date: Tue, 13 Feb 2007 14:34:28 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <20070213221729.772002682@xxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: quilt/0.46-1
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)

-- 


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>