Re: [PATCH v6 1/4] memory: prevent dma-reentracy issues

[Peter Maydell]

On Fri, 10 Mar 2023 at 12:32, Alexander Bulekov <alxndr@bu.edu> wrote:
> This MR seems to be "lsi-ram".
>
> From hw/scsi/lsi53c895a.c:
>
> memory_region_init_io(&s->ram_io, OBJECT(s), &lsi_ram_ops, s,
>         "lsi-ram", 0x2000);
>
> So the LSI device is reading an LSI "Script" from its own IO region.. In
> this particular case, I think there was no reason to use
> memory_region_init_io rather than memory_region_init_ram, but this makes
> me worried that there are other devices that use something like this.

This particular device predates the entire MemoryRegion set of
abstractions, so it might have seemed easier at the time.
The endianness handling of the current code is also a bit
confusing and might make it tricky to convert to a RAM MR.

thanks
-- PMM