[Xen-devel] Re: [RFC PATCH 08/35] Add Xen-specific memory management definitions

[Pete Zaitcev <zaitcev@xxxxxxxxxx>]

On Tue, 09 May 2006 00:00:08 -0700, Chris Wright <chrisw@xxxxxxxxxxxx> wrote:

> +static inline unsigned long pfn_to_mfn(unsigned long pfn)
> +{
> +#ifndef CONFIG_XEN_SHADOW_MODE
> +     if (xen_feature(XENFEAT_auto_translated_physmap))
> +             return pfn;
> +     return phys_to_machine_mapping[(unsigned int)(pfn)] &
> +             ~FOREIGN_FRAME_BIT;
> +#else
> +     return pfn;
> +#endif
> +}

Why do we need several modes in Linux guests?

If a significant tradeoff exists (for example, between performance
and maximum addressable memory), then we need to think about the
real issue instead of throwing config options into the pot.

-- Pete

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