Re: [Xen-devel] allocate_empty_lowmem_region hypervisor function

[Ross McIlroy <ross.mcilroy@xxxxxxxxx>]

> It's only used in the backend drivers, so I guess the build is trying to omit
> that as dead code as far as a domU is concerned.  

Could it be added to DomU, otherwise there is no way to map foreign
pages using the grant tables in unprivileged domains.  I thought the
point of grant tables was to allow inter domain communication between
non-privileged domains?  I could easily supply a patch if people think
this should be possible.

> IIRC the function is pure Linux-isms with no Xen-specifics, so it should be 
> fine to
> build into a domU (or even x86 Linux).

It uses the balloon driver and hypervisor calls, so I don't think it
would work in x86 Linux, but it works fine in DomU.

Thanks,

Ross

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