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

On 11/10/06 10:11, "Gerd Hoffmann" <kraxel@xxxxxxx> wrote:

>>>> In an attempt to get some feedback on the ways I'm currently implementing
>>>> this, I'm sending the set of patches as I currently have them. These permit
>>>> a 32-bit PAE Linux dom0 kernel to come up on a 64-bit hypervisor, but
>>>> progress only goes this far currently (very early during invocation of the
>>>> first user mode code page table permissions aren't set correctly yet,
>>>> making
>>>> Xen kill the guest).
> 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?

 -- Keir

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