Re: [Xen-devel] Reserved-memory node handling in XEN ( WAS Re: [ARM] Handling CMA pool device nodes in Dom0)

[Andrii Anisov <andrii_anisov@xxxxxxxx>]

On 27.07.17 13:56, Julien Grall wrote:
> Let's rephrase it differently. Is the reserved memory always RAM or 
> could it be other things?
I think this have to be checked with the DT spec to have an answer.

> Well, if your region is cacheable it might be possible to have some 
> data left in the cache after the domain destruction.
> If you start a domain afterwards, it may be able to read data that 
> belonged to the previous domain. Hence data leak.
> All region of page allocated by the memory allocator in Xen will be 
> clean and invalidate to prevent such leak. This will not be the case 
> for reserved memory as this will not be managed by the memory allocator.
So that is the question to the reserved-memory support design. And 
should be considered during the choosing the approach (manage it with 
existing allocator, or implement something aside)
--

*Andrii Anisov*


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