ppc: fix -mem-path failure

commit e938ba0c tried to enable -mem-path for ppc but breaked some ppc
boards.

The problems are:

1. it fails when allocating memory for rom, sram whose sizes are less
   than huge page size:

   ./ppc-softmmu/qemu-system-ppc  -m 512 -mem-path /hugepages/ \
   -kernel /home/hutao/Downloads/vmlinux-ppc -initrd \
   /home/hutao/Downloads/initrd-ppc.gz
   qemu-system-ppc: /mnt/data/projects/qemu/exec.c:1184: qemu_ram_set_idstr: Assertion `new_block' failed.

2. if there is a numa node backed by memory backend object, qemu fails
   with message:

   ./ppc-softmmu/qemu-system-ppc  -m 512 \
   -object memory-backend-file,size=512M,mem-path=/hugepages,id=f0 \
   -numa node,nodeid=0,memdev=f0 \
   -kernel /home/hutao/Downloads/vmlinux-ppc \
   -initrd /home/hutao/Downloads/initrd-ppc.gz
   qemu-system-ppc: memory backend f0 is used multiple times. Each -numa option must use a different memdev value.

This patch does following:

1. replaces memory_region_allocate_system_memory() with
   memory_region_init_ram() for rom, sram. Then only system memory
   is backed by hugepages when specifying mem-path.

2. for memory banks, allocates all ram with
   one memory_region_allocate_system_memory(), and use
   memory_region_init_alias() to initialize memory banks.

Tested machines: default(g3beige), mac99, taihu, bamboo, ref405ep.

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 26 insertions, 12 deletions

diff --git a/hw/ppc/ppc4xx_devs.c b/hw/ppc/ppc4xx_devs.c
index 07f9d00ea7..2b5d2cd6c3 100644
--- a/hw/ppc/ppc4xx_devs.c
+++ b/hw/ppc/ppc4xx_devs.c
@@ -683,28 +683,20 @@ ram_addr_t ppc4xx_sdram_adjust(ram_addr_t ram_size, int nr_banks,
                                hwaddr ram_sizes[],
                                const unsigned int sdram_bank_sizes[])
 {
+    MemoryRegion *ram = g_malloc0(sizeof(*ram));
     ram_addr_t size_left = ram_size;
     ram_addr_t base = 0;
+    unsigned int bank_size;
     int i;
     int j;
 
     for (i = 0; i < nr_banks; i++) {
         for (j = 0; sdram_bank_sizes[j] != 0; j++) {
-            unsigned int bank_size = sdram_bank_sizes[j];
-
+            bank_size = sdram_bank_sizes[j];
             if (bank_size <= size_left) {
-                char name[32];
-                snprintf(name, sizeof(name), "ppc4xx.sdram%d", i);
-                memory_region_allocate_system_memory(&ram_memories[i], NULL,
-                                                     name, bank_size);
-                ram_bases[i] = base;
-                ram_sizes[i] = bank_size;
-                base += bank_size;
                 size_left -= bank_size;
-                break;
             }
         }
-
         if (!size_left) {
             /* No need to use the remaining banks. */
             break;
@@ -712,9 +704,31 @@ ram_addr_t ppc4xx_sdram_adjust(ram_addr_t ram_size, int nr_banks,
     }
 
     ram_size -= size_left;
-    if (size_left)
+    if (size_left) {
         printf("Truncating memory to %d MiB to fit SDRAM controller limits.\n",
                (int)(ram_size >> 20));
+    }
+
+    memory_region_allocate_system_memory(ram, NULL, "ppc4xx.sdram", ram_size);
+
+    size_left = ram_size;
+    for (i = 0; i < nr_banks && size_left; i++) {
+        for (j = 0; sdram_bank_sizes[j] != 0; j++) {
+            bank_size = sdram_bank_sizes[j];
+
+            if (bank_size <= size_left) {
+                char name[32];
+                snprintf(name, sizeof(name), "ppc4xx.sdram%d", i);
+                memory_region_init_alias(&ram_memories[i], NULL, name, ram,
+                                         base, bank_size);
+                ram_bases[i] = base;
+                ram_sizes[i] = bank_size;
+                base += bank_size;
+                size_left -= bank_size;
+                break;
+            }
+        }
+    }
 
     return ram_size;
 }