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hw/riscv: virt: Limit RAM size in a 32-bit system

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RV32 supports 34-bit physical address hence the maximum RAM size
should be limited. Limit the RAM size to 10 GiB, which leaves
some room for PCIe high mmio space.

For 32-bit host, this is not needed as machine->ram_size cannot
represent a RAM size that big. Use a #if size test to only do
the size limitation for the 64-bit host.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210220144807.819-4-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Bin Meng 2021-02-20 22:48:06 +08:00 committed by Alistair Francis
parent 2fa3c7b6ee
commit cfeb8a17c8
1 changed files with 10 additions and 0 deletions
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10
hw/riscv/virt.c
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@ -590,6 +590,16 @@ static void virt_machine_init(MachineState *machine)
}
}
if (riscv_is_32bit(&s->soc[0])) {
#if HOST_LONG_BITS == 64
/* limit RAM size in a 32-bit system */
if (machine->ram_size > 10 * GiB) {
machine->ram_size = 10 * GiB;
error_report("Limiting RAM size to 10 GiB");
}
#endif
}
/* register system main memory (actual RAM) */
memory_region_init_ram(main_mem, NULL, "riscv_virt_board.ram",
machine->ram_size, &error_fatal);