From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: [patch 18/26] Xen-paravirt_ops: Add XEN config options Date: Tue, 27 Feb 2007 00:13:55 -0800 Message-ID: <20070227081636.148748374@goop.org> References: <20070227081337.434798469@goop.org> Return-path: Content-Disposition: inline; filename=xen-config.patch Sender: linux-kernel-owner@vger.kernel.org To: Andi Kleen Cc: Andrew Morton , linux-kernel@vger.kernel.org, virtualization@lists.osdl.org, xen-devel@lists.xensource.com, Chris Wright , Zachary Amsden , Rusty Russell , Ian Pratt , Christian Limpach List-Id: virtualization@lists.linuxfoundation.org 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 Signed-off-by: Ian Pratt Signed-off-by: Christian Limpach Signed-off-by: Chris Wright --- 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. --