Re: [Xen-devel] [PATCH,RFC 0/17] 32-on-64 work progress

[Gerd Hoffmann <kraxel@xxxxxxx>]

Keir Fraser wrote:
> On 11/10/06 10:11, "Gerd Hoffmann" <kraxel@xxxxxxx> wrote:
> 
>> Do you have any plans how domU bootup is going to work?  Especially how
>> hypercalls where one domain (typically dom0) changes the state of
>> another domain are supposed to work?  That includes the complete
>> XEN_DOMCTL_* family, also some memory management hypercalls such as
>> mach2phys and pagetable updates, maybe more.  These are used by the
>> domain tools to create a new domain and somehow must handle the case
>> that we want be able to build 32bit guest domains from a 64bit dom0 (and
>> visa versa?).
> 
> The tools are going to have to know that they are building a 32p-on-64
> guest. What problems do you perceive?

Sure, they have to know.  Question is what do you pass in when changing
a 32bit guest from 64bit dom0.  The 32bit struct?  The 64bit struct?  I
think in many cases both will work just fine and we have just have to
pick one way.  XEN_DOMCTL_setvcpucontext is a icky one though, the 64bit
 struct isn't a superset of the 32bit struct, so we probably have to
pass the 32bit version for 32bit guests.

cheers,

  Gerd

-- 
Gerd Hoffmann <kraxel@xxxxxxx>
http://www.suse.de/~kraxel/julika-dora.jpeg

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