Re: [Xen-devel] Re: [PATCH]: Allow tools to map arbitrarily large machphys_mfn_list on 32bit dom0

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 14/03/2011 16:33, "Ian Campbell" <Ian.Campbell@xxxxxxxxxxxxx> wrote:

>> But RDWR_COMPAT_MPT_VIRT_END still doesn't necessarily
>> cover all of the memory the machine may have (after all the
>> range is way smaller than RDWR_MPT_VIRT_{START,END}.
> 
> It's 1GB which is enough to cover 1TB of host memory, which AFAIK is all
> we support these days. It certainly buys us time compared with currently
> failing at 160GB.
> 
>> If that's the goal, then the patch as presented isn't suitable,
>> as there's not event a compat table set up for all of the
>> memory.
> 
> paging_init seems to do the right thing and setup the compat M2P up to a
> maximum of RDWR_COMPAT_MPT_VIRT_END.
> 
>>  I'd say the tools then need to have access to the
>> native table, reading 64-bit MFNs from it (since, with MFN
>> compression, we can exceed 32-bits).
> 
> That's another option I guess.

It's not really an option for 4.1.0. Can we at least agree that this is an
improvement for now, and in time for 4.1.0?

 -- Keir



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