Re: [Xen-ia64-devel] [Patch][RFC] allocate all memory to dom0

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 05 Octobre 2006 09:00, Akio Takebe a écrit :
> Hi,
>
> Also in the case of current Xen-ia64-unstable(cset:11721),
> this panic is occured by specified dom0_mem=4G.
> (without my patch)
>
> I think the following error message is hint of this bug.
> (XEN) Warning: UC to WB for mpaddr=f9ff0000
>
> I checked the arch/ia64/xen/mm.c
> Why changing pteval2 from UC to WB is OK?
Mainly because it is harmless.

> If pteval2 is WB and pteval is UC, should pteval2 be changed to UC?
pteval2 (ie, the machine attribute - the name is not clear enough) attribute 
must not be changed.  On some machines (HP) accessing WB space using UC bus 
transaction may generate MCA.

The question is why the kernel tries to map f9ff0000 as UC ?  

Tristan.

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