ramblocks: Make use of DeviceState pointer and BusInfo.get_dev_path

With these two pieces in place, we can start naming ramblocks.  When
the device is present and it lives on a bus that provides a device
path, we concatenate the path and the provided name.  Otherwise we
just use name.  The resulting id string must be unique.  For now we
assume an allocation for the same name and size is a device that has
been removed and reinserted and return the same block.  This will go
away once qemu_ram_free() is implemented.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

2 files changed, 28 insertions, 2 deletions

diff --git a/cpu-all.h b/cpu-all.h
index dbb21394d1..5d8342bac6 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -865,6 +865,7 @@ typedef struct RAMBlock {
     uint8_t *host;
     ram_addr_t offset;
     ram_addr_t length;
+    char idstr[256];
     QLIST_ENTRY(RAMBlock) next;
 } RAMBlock;
 
diff --git a/exec.c b/exec.c
index 164ba16131..fd47d5bc9a 100644
--- a/exec.c
+++ b/exec.c
@@ -36,6 +36,7 @@
 #include "qemu-common.h"
 #include "tcg.h"
 #include "hw/hw.h"
+#include "hw/qdev.h"
 #include "osdep.h"
 #include "kvm.h"
 #include "qemu-timer.h"
@@ -2780,10 +2781,34 @@ static ram_addr_t find_ram_offset(ram_addr_t size)
 
 ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
 {
-    RAMBlock *new_block;
+    RAMBlock *new_block, *block;
 
     size = TARGET_PAGE_ALIGN(size);
-    new_block = qemu_malloc(sizeof(*new_block));
+    new_block = qemu_mallocz(sizeof(*new_block));
+
+    if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
+        char *id = dev->parent_bus->info->get_dev_path(dev);
+        if (id) {
+            snprintf(new_block->idstr, sizeof(new_block->idstr), "%s/", id);
+            qemu_free(id);
+        }
+    }
+    pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
+
+    QLIST_FOREACH(block, &ram_list.blocks, next) {
+        if (!strcmp(block->idstr, new_block->idstr)) {
+            if (block->length == new_block->length) {
+                fprintf(stderr, "RAMBlock \"%s\" exists, assuming lack of"
+                        "free.\n", new_block->idstr);
+                qemu_free(new_block);
+                return block->offset;
+            } else {
+                fprintf(stderr, "RAMBlock \"%s\" already registered with"
+                        "different size, abort\n", new_block->idstr);
+                abort();
+            }
+        }
+    }
 
     if (mem_path) {
 #if defined (__linux__) && !defined(TARGET_S390X)