Re: [Xen-devel] Design doc of adding ACPI support for arm64 on Xen - version 5

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.08.15 at 03:00, <shannon.zhao@xxxxxxxxxx> wrote:
> On 2015/8/28 20:55, Julien Grall wrote:
>> On 28/08/15 10:45, Shannon Zhao wrote:
>>> All above tables will be mapped to Dom0 non-RAM space(e.g. the space
>>> after Dom0 RAM).
>> 
>> If I understand correctly what you are saying, you plan to put the
>> tables just after the Dom0 RAM bank. Although, there can be multiple
>> banks and how can you be so sure that there will be no MMIO at this place?
> 
> Currently I use the last RAM bank(kinfo->mem.bank[nr_banks - 1]) to
> calculate the start address of non-RAM place. I'm not sure there will be
> no MMIO at that place. Do you have any good idea to find such sure and
> safe non-ram place?

Assuming that MMIO ranges get mapped 1:1 to Dom0, and taking for
granted that not all of the RAM in the system can possible be handed
to Dom0, there should be ample host RAM address ranges void of any
RAM from Dom0's perspective where the tables could be put.

Jan


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