Re: [PATCH 2/5] hw/arm/aspeed: Do not sysbus-map mmio flash region directly, use alias

[Philippe Mathieu-Daudé]

Incorrect subject prefix, should be "hw/ssi/aspeed_smc"

On 3/12/21 7:28 PM, Philippe Mathieu-Daudé wrote:
> The flash mmio region is exposed as an AddressSpace.
> AddressSpaces must not be sysbus-mapped, therefore map
> the region using an alias.
> 
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  include/hw/ssi/aspeed_smc.h | 1 +
>  hw/ssi/aspeed_smc.c         | 4 +++-
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/include/hw/ssi/aspeed_smc.h b/include/hw/ssi/aspeed_smc.h
> index 16c03fe64f3..e3c96cecbd8 100644
> --- a/include/hw/ssi/aspeed_smc.h
> +++ b/include/hw/ssi/aspeed_smc.h
> @@ -84,6 +84,7 @@ struct AspeedSMCState {
>  
>      MemoryRegion mmio;
>      MemoryRegion mmio_flash;
> +    MemoryRegion mmio_flash_alias;
>  
>      qemu_irq irq;
>      int irqline;
> diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
> index 16addee4dc8..aa26578bdac 100644
> --- a/hw/ssi/aspeed_smc.c
> +++ b/hw/ssi/aspeed_smc.c
> @@ -1386,7 +1386,9 @@ static void aspeed_smc_realize(DeviceState *dev, Error 
> **errp)
>      memory_region_init_io(&s->mmio_flash, OBJECT(s),
>                            &aspeed_smc_flash_default_ops, s, name,
>                            s->ctrl->flash_window_size);
> -    sysbus_init_mmio(sbd, &s->mmio_flash);
> +    memory_region_init_alias(&s->mmio_flash_alias, OBJECT(s), name,
> +                             &s->mmio_flash, 0, s->ctrl->flash_window_size);
> +    sysbus_init_mmio(sbd, &s->mmio_flash_alias);
>  
>      s->flashes = g_new0(AspeedSMCFlash, s->ctrl->max_peripherals);