From: Bibo Mao <maobibo@loongson.cn>

One LoongArch virt machine platform, there is limitation for memory
map information. The minimum memory size is 256M and minimum memory
size for numa node0 is 256M also. With qemu numa qtest, it is possible
that memory size of numa node0 is 128M.

Limitations for minimum memory size for both total memory and numa
node0 is removed for acpi srat table creation.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240515093927.3453674-2-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/loongarch/acpi-build.c | 58 +++++++++++++++++++++++----------------
 1 file changed, 34 insertions(+), 24 deletions(-)

diff --git a/hw/loongarch/acpi-build.c b/hw/loongarch/acpi-build.c
index 5ef010d4da..af45ce526d 100644
--- a/hw/loongarch/acpi-build.c
+++ b/hw/loongarch/acpi-build.c
@@ -166,8 +166,9 @@ static void
 build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
 {
     int i, arch_id, node_id;
-    uint64_t mem_len, mem_base;
-    int nb_numa_nodes = machine->numa_state->num_nodes;
+    hwaddr len, base, gap;
+    NodeInfo *numa_info;
+    int nodes, nb_numa_nodes = machine->numa_state->num_nodes;
     LoongArchVirtMachineState *lvms = LOONGARCH_VIRT_MACHINE(machine);
     MachineClass *mc = MACHINE_GET_CLASS(lvms);
     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
@@ -196,35 +197,44 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
         build_append_int_noprefix(table_data, 0, 4); /* Reserved */
     }
 
-    /* Node0 */
-    build_srat_memory(table_data, VIRT_LOWMEM_BASE, VIRT_LOWMEM_SIZE,
-                      0, MEM_AFFINITY_ENABLED);
-    mem_base = VIRT_HIGHMEM_BASE;
-    if (!nb_numa_nodes) {
-        mem_len = machine->ram_size - VIRT_LOWMEM_SIZE;
-    } else {
-        mem_len = machine->numa_state->nodes[0].node_mem - VIRT_LOWMEM_SIZE;
+    base = VIRT_LOWMEM_BASE;
+    gap = VIRT_LOWMEM_SIZE;
+    numa_info = machine->numa_state->nodes;
+    nodes = nb_numa_nodes;
+    if (!nodes) {
+        nodes = 1;
     }
-    if (mem_len)
-        build_srat_memory(table_data, mem_base, mem_len, 0, MEM_AFFINITY_ENABLED);
-
-    /* Node1 - Nodemax */
-    if (nb_numa_nodes) {
-        mem_base += mem_len;
-        for (i = 1; i < nb_numa_nodes; ++i) {
-            if (machine->numa_state->nodes[i].node_mem > 0) {
-                build_srat_memory(table_data, mem_base,
-                                  machine->numa_state->nodes[i].node_mem, i,
-                                  MEM_AFFINITY_ENABLED);
-                mem_base += machine->numa_state->nodes[i].node_mem;
-            }
+
+    for (i = 0; i < nodes; i++) {
+        if (nb_numa_nodes) {
+            len = numa_info[i].node_mem;
+        } else {
+            len = machine->ram_size;
+        }
+
+        /*
+         * memory for the node splited into two part
+         *   lowram:  [base, +gap)
+         *   highram: [VIRT_HIGHMEM_BASE, +(len - gap))
+         */
+        if (len >= gap) {
+            build_srat_memory(table_data, base, len, i, MEM_AFFINITY_ENABLED);
+            len -= gap;
+            base = VIRT_HIGHMEM_BASE;
+            gap = machine->ram_size - VIRT_LOWMEM_SIZE;
+        }
+
+        if (len) {
+            build_srat_memory(table_data, base, len, i, MEM_AFFINITY_ENABLED);
+            base += len;
+            gap  -= len;
         }
     }
 
     if (machine->device_memory) {
         build_srat_memory(table_data, machine->device_memory->base,
                           memory_region_size(&machine->device_memory->mr),
-                          nb_numa_nodes - 1,
+                          nodes - 1,
                           MEM_AFFINITY_HOTPLUGGABLE | MEM_AFFINITY_ENABLED);
     }
 
-- 
2.34.1