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[Xen-devel] Re: [RFC PATCH 04/33] Add XEN config options and disable uns

To: Chris Wright <chrisw@xxxxxxxxxxxx>
Subject: [Xen-devel] Re: [RFC PATCH 04/33] Add XEN config options and disable unsupported config options.
From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
Date: Tue, 18 Jul 2006 11:59:12 +0200
Cc: Andrew Morton <akpm@xxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andi Kleen <ak@xxxxxxx>, virtualization@xxxxxxxxxxxxxx, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
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> The disabled config options are:
> - DOUBLEFAULT: are trapped by Xen and not virtualized
> - HZ: defaults to 100 in Xen VMs


this makes no real sense with dynamic ticks coming up... HZ=1000 should
be perfectly fine then...

>  config KEXEC
>       bool "kexec system call (EXPERIMENTAL)"
> -     depends on EXPERIMENTAL
> +     depends on EXPERIMENTAL && !X86_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

hmmm why is kexec incompatible with xen? Don't you want to support crash
dumps from guests?

> +     bool
> +     default y
> +     help
> +       Fakes out a shadow mode kernel
> +

this probably wants a better description...

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