Re: [PATCH v2] QEMU fw_cfg DMA interface documentation

From: Laszlo Ersek
Date: Mon Sep 07 2015 - 07:25:29 EST

On 09/07/15 13:08, Gerd Hoffmann wrote:
> Hi,
>> It's just simplicity. If you want to read a few times from the same
>> field (like in ACPI tables, read the data size and then the data), you
>> need a way to enable and disable the selector and manage the current
>> offset for that entry. This is already provided with the "old"
>> interface.
> Could be handled with a 'select' control bit. Only when set select
> entry and reset offset to zero.
> Also: would it make sense to allow an *array* of FWCfgDmaAccess structs?
> With a 'more' bit in control we could indicate that there are more
> entries. I'm not sure firmware would actually use that though ...

Seems far-fetched.


> cheers,
> Gerd

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