[PATCH 2/6] hw/riscv: opentitan: Use MachineState::ram and MachineClass::default_ram_id

[Bin Meng <bmeng.cn@gmail.com>]

Using memory_region_init_ram(), which can't possibly handle vhost-user,
and can't work as expected with '-numa node,memdev' options.

Use MachineState::ram instead of manually initializing RAM memory
region, as well as by providing MachineClass::default_ram_id to
opt in to memdev scheme.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
---

 hw/riscv/opentitan.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/hw/riscv/opentitan.c b/hw/riscv/opentitan.c
index 9803ae6d70..c356293d29 100644
--- a/hw/riscv/opentitan.c
+++ b/hw/riscv/opentitan.c
@@ -67,17 +67,14 @@ static void opentitan_board_init(MachineState *machine)
     const MemMapEntry *memmap = ibex_memmap;
     OpenTitanState *s = g_new0(OpenTitanState, 1);
     MemoryRegion *sys_mem = get_system_memory();
-    MemoryRegion *main_mem = g_new(MemoryRegion, 1);
 
     /* Initialize SoC */
     object_initialize_child(OBJECT(machine), "soc", &s->soc,
                             TYPE_RISCV_IBEX_SOC);
     qdev_realize(DEVICE(&s->soc), NULL, &error_abort);
 
-    memory_region_init_ram(main_mem, NULL, "riscv.lowrisc.ibex.ram",
-        memmap[IBEX_DEV_RAM].size, &error_fatal);
     memory_region_add_subregion(sys_mem,
-        memmap[IBEX_DEV_RAM].base, main_mem);
+        memmap[IBEX_DEV_RAM].base, machine->ram);
 
     if (machine->firmware) {
         riscv_load_firmware(machine->firmware, memmap[IBEX_DEV_RAM].base, NULL);
@@ -95,6 +92,7 @@ static void opentitan_machine_init(MachineClass *mc)
     mc->init = opentitan_board_init;
     mc->max_cpus = 1;
     mc->default_cpu_type = TYPE_RISCV_CPU_IBEX;
+    mc->default_ram_id = "riscv.lowrisc.ibex.ram";
 }
 
 DEFINE_MACHINE("opentitan", opentitan_machine_init)
-- 
2.25.1