Re: [RFC] design: design doc for 1:1 direct-map

[Jan Beulich <jbeulich@xxxxxxxx>]

On 08.12.2020 10:07, Julien Grall wrote:
> On 08/12/2020 05:21, Penny Zheng wrote:
>> --- /dev/null
>> +++ b/docs/designs/1_1_direct-map.md
>> @@ -0,0 +1,87 @@
>> +# Preface
>> +
>> +The document is an early draft for direct-map memory map
>> +(`guest physical == physical`) of domUs. And right now, it constrains to ARM
> 
> s/constrains/limited/
> 
> Aside the interface to the user, you should be able to re-use the same 
> code on x86. Note that because the memory layout on x86 is fixed (always 
> starting at 0), you would only be able to have only one direct-mapped 
> domain.

Even one seems challenging, if it's truly meant to have all of the
domain's memory direct-mapped: The use of space in the first Mb is
different between host and guest.

Jan