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Re: [Xen-devel] Re: [PATCH]: Allow tools to map arbitrarily large machp

To: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH]: Allow tools to map arbitrarily large machphys_mfn_list on 32bit dom0
From: Keir Fraser <keir.xen@xxxxxxxxx>
Date: Mon, 14 Mar 2011 16:54:27 +0000
Cc: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
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Thread-topic: [Xen-devel] Re: [PATCH]: Allow tools to map arbitrarily large machphys_mfn_list on 32bit dom0
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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
>>  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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