Re: [Xen-devel] Map NVRAM to domU kernels

[ayush ruia <ayushruia@xxxxxxxxx>]

That is what I am planning to do for my thesis. Thus any advice and pointers would be really helpful.

Thanks for the quick reply Jan. Appreciate your help.

Regards,

Ayush Ruia.

On Fri, Aug 29, 2014 at 5:05 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:

>>> On 28.08.14 at 22:03, <ayushruia@xxxxxxxxx> wrote:
> I am trying to get Xen to work with Non-volatile RAM across multiple domU
> kernels. Thus any help and pointers on ways to achieve this would be really
> helpful. My question is summarized below.
>
> How does Xen handle the e820 memory map for domU kernels. The test machine
> e820 memory map that I am working on, returns the following ( Just showing
> the relevant parts) corrosponding the NVRAM.
>
> 100000000-17fffffff : System RAM
> 180000000-37fffffff : reserved
>
> The second line corrosponds to the NVRAM which is a region from 6GB to 14GB
> in the dom0 kernel. This is the region that I am trying to share across
> multiple DomU kernels just like a malloc pool.

The range being marked as reserved, Xen will treat it as such
and not touch it at all. If you know that this an NVRAM region,
you'll have to write code driving its use.

Jan

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