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

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 14.03.11 at 17:54, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> 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?

Yes, as long as the tools can handle the extended output.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel