ms3: fix skeleton

ms3/app/driver.c

@@ -43,6 +43,9 @@ static size_t dma_mem_size = 16 * 1024 * 1024;
 static uint8_t *dma_mem;
 static uintptr_t dma_mem_phys;
 
+static uint8_t *dma_mem_w;
+static uintptr_t dma_mem_phys_w;
+
 int accelerator_init(bool dma) {
   struct vfio_dev dev;
   size_t reg_len;
@@ -69,6 +72,9 @@ int accelerator_init(bool dma) {
       return -1;
     }
 
+    dma_mem_w = (uint8_t *) dma_mem + (matrix_size * matrix_size);
+    dma_mem_phys_w = dma_mem_phys + (matrix_size * matrix_size);
+
     if (vfio_busmaster_enable(&dev)) {
       fprintf(stderr, "Enabling busmastering failed\n");
       return -1;