Re: [Xen-devel] Xen hypervisor hangs on booting against c/s 16925

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Does Linux have a permanent mapping, indeed a superpage mapping, of the
bottom megabyte? I think it does. The fact that this persists in the Linux
kernel, which is thoroughly tested on many many platforms, I think indicates
we are over-worrying about mappings of the bottom megabyte.

 -- Keir

On 29/1/08 10:54, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> .. which is bad, and should probably be changed, too. Jan
> 
>>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 29.01.08 11:40 >>>
> Also, bear in mind that dom0 permanently has a WB mapping of the whole
> bottom megabyte.
> 
>  -- Keir
> 
> On 29/1/08 10:36, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> wrote:
> 
>> How about we just map the whole megabyte UC- at start of day? We rarely touch
>> anything down there and when we do it'll mostly be BIOS tables (hence in ROM
>> and hence not marked as RAM in e820 and hence your approach would have them
>> also marked UC-). That at least has the tangible benefit of removing a few
>> lines of (assembly) code. :-)
>> 
>>  -- Keir
> 
> 
> 



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