Re: [Xen-devel] pickle_domptr and unpickle_domptr issue with >4GB

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 Jun 2005, at 16:56, Nakajima, Jun wrote:

> __pa(domain) will be truncated (and be set to that pfn as the owner)
> when we have physical pages >4GB, and unpickle_domptr will return a
> wrong address. Then get_page(), for example, checks if the domain is 
> the
> ownwer for the page like (=>), and it fails...:
The Xen heap allocator (from which domain structs are taken) is limited 
to the bottom few megabytes of physmem. So you will never have a domain 
struct whose phys address overflows 32 bits.
Longer term I'd like to relax the restriction on Xen heap allocations 
on x86/64 so that most of physmem can be shared between Xen and domain 
heap allocators. At that point we'll just have to ensure that Xen 
allocations, or at least domain-struct allocations, only occur from 
bottom 4GB of memory map. Not very onerous I believe. :-)
 -- Keir


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