Shared Memory in tz_vmm demo

[Joseph Lee]

Hi,

I used "*dma_alloc_coherent( )"* as described in this thread (
https://sourceforge.net/p/genode/mailman/message/34685275/) to allocate
shared memory between the trustzone worlds in the tz_vmm example on i.mx53
qsb. It works well. But my questions is how do we  prevent the normal world
from modifying this shared buffer while it is being used by the secure
world. Thanks in advance for answers.



Kind regards,
Joseph
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