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docs/devel: add some clarifying text for aliases 

We do mention the limitation of single parenthood for
memory_region_add_subregion but lets also make it clear how aliases
help solve that conundrum.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220110175104.2908956-7-alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
staging
Alex Bennée 2022-01-10 17:51:04 +00:00 committed by Philippe Mathieu-Daudé
parent f02b664aad
commit 9d696cd504
1 changed files with 9 additions and 5 deletions
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14
docs/devel/memory.rst
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@ -67,11 +67,15 @@ MemoryRegion):
You initialize a pure container with memory_region_init().
- alias: a subsection of another region. Aliases allow a region to be
split apart into discontiguous regions. Examples of uses are memory banks
used when the guest address space is smaller than the amount of RAM
addressed, or a memory controller that splits main memory to expose a "PCI
hole". Aliases may point to any type of region, including other aliases,
- alias: a subsection of another region. Aliases allow a region to be
split apart into discontiguous regions. Examples of uses are memory
banks used when the guest address space is smaller than the amount
of RAM addressed, or a memory controller that splits main memory to
expose a "PCI hole". You can also create aliases to avoid trying to
add the original region to multiple parents via
`memory_region_add_subregion`.
Aliases may point to any type of region, including other aliases,
but an alias may not point back to itself, directly or indirectly.
You initialize these with memory_region_init_alias().