[Xen-devel] Re: [RFC PATCH 01/35] Add XEN config options and disable unsupported config options.

[Daniel Walker <dwalker@xxxxxxxxxx>]

On Tue, 2006-05-09 at 00:00 -0700, Chris Wright wrote:
> plain text document attachment (config-xen)
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
> Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
> ---
>  arch/i386/Kconfig       |   18 ++++++++++++++----
>  arch/i386/Kconfig.debug |    1 +
>  drivers/xen/Kconfig     |   21 +++++++++++++++++++++
>  kernel/Kconfig.hz       |    4 ++--
>  kernel/Kconfig.preempt  |    1 +
>  5 files changed, 39 insertions(+), 6 deletions(-)
> 
> --- linus-2.6.orig/arch/i386/Kconfig
> +++ linus-2.6/arch/i386/Kconfig
> @@ -55,6 +55,7 @@ menu "Processor type and features"
>  
>  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
> @@ -91,6 +92,12 @@ 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.
> +

Couldn't you just add "depends on !SMP && .." to the config X86_XEN
block ? 

Daniel


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