Support fw_cfg dma function for LoongArch virt machine.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
---
 hw/loongarch/Kconfig  | 1 +
 hw/loongarch/fw_cfg.c | 3 ++-
 hw/loongarch/virt.c   | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/loongarch/Kconfig b/hw/loongarch/Kconfig
index 73c52b093e..1deea83626 100644
--- a/hw/loongarch/Kconfig
+++ b/hw/loongarch/Kconfig
@@ -16,3 +16,4 @@ config LOONGARCH_VIRT
     select SMBIOS
     select ACPI_PCI
     select ACPI_HW_REDUCED
+    select FW_CFG_DMA
diff --git a/hw/loongarch/fw_cfg.c b/hw/loongarch/fw_cfg.c
index f6503d5607..f15a17416c 100644
--- a/hw/loongarch/fw_cfg.c
+++ b/hw/loongarch/fw_cfg.c
@@ -23,7 +23,8 @@ FWCfgState *loongarch_fw_cfg_init(ram_addr_t ram_size, MachineState *ms)
     int max_cpus = ms->smp.max_cpus;
     int smp_cpus = ms->smp.cpus;
 
-    fw_cfg = fw_cfg_init_mem_wide(VIRT_FWCFG_BASE + 8, VIRT_FWCFG_BASE, 8, 0, NULL);
+    fw_cfg = fw_cfg_init_mem_wide(VIRT_FWCFG_BASE + 8, VIRT_FWCFG_BASE, 8,
+                                  VIRT_FWCFG_BASE + 16, &address_space_memory);
     fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
     fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);
     fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index b56820ecda..4f833a2044 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -118,7 +118,7 @@ static void fdt_add_fw_cfg_node(const LoongArchMachineState *lams)
     qemu_fdt_setprop_string(ms->fdt, nodename,
                             "compatible", "qemu,fw-cfg-mmio");
     qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg",
-                                 2, base, 2, 0x8);
+                                 2, base, 2, 0x18);
     qemu_fdt_setprop(ms->fdt, nodename, "dma-coherent", NULL, 0);
     g_free(nodename);
 }
-- 
2.31.1