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[PATCH v2 3/4] hw/riscv: virt: Limit RAM size in a 32-bit system
From: |
Bin Meng |
Subject: |
[PATCH v2 3/4] hw/riscv: virt: Limit RAM size in a 32-bit system |
Date: |
Fri, 19 Feb 2021 23:39:14 +0800 |
From: Bin Meng <bin.meng@windriver.com>
RV32 supports 34-bit physical address hence the maximum RAM size
should be limitted. 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>
---
Changes in v2:
- Use a #if size test to only do the size limitation for the 64-bit host
hw/riscv/virt.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 1d05bb3..fc90bc8 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -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("Limitting 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);
--
2.7.4