Re: [Xen-devel] 32bit xen and "claim"

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.11.12 at 21:55, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:
>> >when prototyping the "claim" hypercall/subop, can I assume
>> >that the CONFIG_X86 code in the hypervisor and, specifically
>> >any separation of the concepts of xen_heap from dom_heap,
>> >can be ignored?
>> 
>> No, you shouldn't. Once adding support for memory amounts beyond 5Tb
>> I expect the separation to become meaningful even for x86-64.
> 
> On quick scan, I don't see anything obvious in the archives
> that explains why 5Tb is the limit (rather than, say, 4Tb
> or 8Tb, or some other power of two).  Could you provide a
> pointer to this info or, if you agree it is non-obvious and
> undocumented, say a few words of explanation?

xen/include/asm-x86/config.h:DIRECTMAP_* (and the comment
preceding all those #define-s).

> Also, just wondering, should exceeding 5Tb be on the 4.3
> features list or is >5Tb physical memory still too far away?

It _is_ on the feature list. So far I just had way too many other
issues to deal with, preventing me to get started with that work.

Jan


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