Re: [Xen-devel] hypercall_xlat_continuation()

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 27/05/2009 09:02, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>> You know that all the 'xlat' stuff in Xen is for 32-bit guests running on
>>> 64-bit hypervisor, right? 64-bit dom0 would never execute this logic.
>> 
>> Unless someone like me, in trying to make 32bit apps on 64bit dom0 work,
>> causes it to take compat path if it's 32bit hcall. Yeah, I know whacky :)...
> 
> I don't think that's a good approach - even when dealing with 32-bit apps,
> it's a 64-bit kernel, and hence you should rather translate things to the
> 64-bit format in the kernel layer that sits in between (after all, apps can't
> do hypercalls directly).

Why would you do that when the tedious translation mechanism already exists
in the hypervisor?

 -- Keir



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