Re: [PATCH-for-6.0] hw/ppc/mac_newworld: Restrict RAM to 2 GiB

[BALATON Zoltan]

On Tue, 6 Apr 2021, Philippe Mathieu-Daudé wrote:
> On Mac99 and newer machines, the Uninorth PCI host bridge maps
> the PCI hole region at 2GiB, so the RAM area beside 2GiB is not
> accessible by the CPU. Restrict the memory to 2GiB to avoid
> problems such the one reported in the buglink.
>
> Buglink: https://bugs.launchpad.net/qemu/+bug/1922391
> Reported-by: Håvard Eidnes <he@NetBSD.org>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>

> ---
> hw/ppc/mac_newworld.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
> index 21759628466..d88b38e9258 100644
> --- a/hw/ppc/mac_newworld.c
> +++ b/hw/ppc/mac_newworld.c
> @@ -157,6 +157,10 @@ static void ppc_core99_init(MachineState *machine)
>     }
>
>     /* allocate RAM */
> +    if (machine->ram_size > 2 * GiB) {
> +        error_report("RAM size more than 2 GiB is not supported");
> +        exit(1);
> +    }
>     memory_region_add_subregion(get_system_memory(), 0, machine->ram);
>
>     /* allocate and load firmware ROM */