Re: [PATCH] docs/devel: memory: Document MemoryRegionOps requirement

[David Hildenbrand]

On 06.09.21 14:20, Bin Meng wrote:
> It's been a requirement that at least one function pointer for read
> and one for write are provided ever since the MemoryRegion APIs were
> introduced in 2012.
>
> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
> ---
>
>   docs/devel/memory.rst | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/docs/devel/memory.rst b/docs/devel/memory.rst
> index 5dc8a12682..7b589b21d2 100644
> --- a/docs/devel/memory.rst
> +++ b/docs/devel/memory.rst
> @@ -344,6 +344,11 @@ based on the attributes used for the memory transaction, 
> or need
>   to be able to respond that the access should provoke a bus error
>   rather than completing successfully; those devices can use the
>   ->read_with_attrs() and ->write_with_attrs() callbacks instead.
> +The requirement for a device's MemoryRegionOps is that at least
> +one callback for read and one for write are provided. If both
> +->read() and ->read_with_attrs() are provided, the plain ->read()
> +version takes precedence over the with_attrs() version. So does
> +the write callback.

Reviewed-by: David Hildenbrand <david@redhat.com>

--
Thanks,

David / dhildenb