[PULL,03/14] loader: store FW CFG ROM files in RAM

diff --git a/hw/core/loader.c b/hw/core/loader.c
index 6875b7e..7b3d3ee 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -54,6 +54,8 @@ 
 
 #include <zlib.h>
 
+bool rom_file_in_ram = true;
+
 static int roms_loaded;
 
 /* return the size or -1 if error */
@@ -576,6 +578,7 @@  struct Rom {
     size_t datasize;
 
     uint8_t *data;
+    MemoryRegion *mr;
     int isrom;
     char *fw_dir;
     char *fw_file;
@@ -605,6 +608,21 @@  static void rom_insert(Rom *rom)
     QTAILQ_INSERT_TAIL(&roms, rom, next);
 }
 
+static void *rom_set_mr(Rom *rom, Object *owner, const char *name)
+{
+    void *data;
+
+    rom->mr = g_malloc(sizeof(*rom->mr));
+    memory_region_init_ram(rom->mr, owner, name, rom->datasize);
+    memory_region_set_readonly(rom->mr, true);
+    vmstate_register_ram_global(rom->mr);
+
+    data = memory_region_get_ram_ptr(rom->mr);
+    memcpy(data, rom->data, rom->datasize);
+
+    return data;
+}
+
 int rom_add_file(const char *file, const char *fw_dir,
                  hwaddr addr, int32_t bootindex)
 {
@@ -646,6 +664,7 @@  int rom_add_file(const char *file, const char *fw_dir,
     if (rom->fw_file && fw_cfg) {
         const char *basename;
         char fw_file_name[56];
+        void *data;
 
         basename = strrchr(rom->fw_file, '/');
         if (basename) {
@@ -655,8 +674,15 @@  int rom_add_file(const char *file, const char *fw_dir,
         }
         snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
                  basename);
-        fw_cfg_add_file(fw_cfg, fw_file_name, rom->data, rom->romsize);
         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
+
+        if (rom_file_in_ram) {
+            data = rom_set_mr(rom, OBJECT(fw_cfg), devpath);
+        } else {
+            data = rom->data;
+        }
+
+        fw_cfg_add_file(fw_cfg, fw_file_name, data, rom->romsize);
     } else {
         snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
     }
@@ -731,7 +757,12 @@  static void rom_reset(void *unused)
         if (rom->data == NULL) {
             continue;
         }
-        cpu_physical_memory_write_rom(rom->addr, rom->data, rom->datasize);
+        if (rom->mr) {
+            void *host = memory_region_get_ram_ptr(rom->mr);
+            memcpy(host, rom->data, rom->datasize);
+        } else {
+            cpu_physical_memory_write_rom(rom->addr, rom->data, rom->datasize);
+        }
         if (rom->isrom) {
             /* rom needs to be written only once */
             g_free(rom->data);
@@ -781,6 +812,9 @@  static Rom *find_rom(hwaddr addr)
         if (rom->fw_file) {
             continue;
         }
+        if (rom->mr) {
+            continue;
+        }
         if (rom->addr > addr) {
             continue;
         }
@@ -808,6 +842,9 @@  int rom_copy(uint8_t *dest, hwaddr addr, size_t size)
         if (rom->fw_file) {
             continue;
         }
+        if (rom->mr) {
+            continue;
+        }
         if (rom->addr + rom->romsize < addr) {
             continue;
         }
@@ -866,7 +903,13 @@  void do_info_roms(Monitor *mon, const QDict *qdict)
     Rom *rom;
 
     QTAILQ_FOREACH(rom, &roms, next) {
-        if (!rom->fw_file) {
+        if (rom->mr) {
+            monitor_printf(mon, "%s"
+                           " size=0x%06zx name=\"%s\"\n",
+                           rom->mr->name,
+                           rom->romsize,
+                           rom->name);
+        } else if (!rom->fw_file) {
             monitor_printf(mon, "addr=" TARGET_FMT_plx
                            " size=0x%06zx mem=%s name=\"%s\"\n",
                            rom->addr, rom->romsize,
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 46f1fd7..4591027 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -25,6 +25,7 @@ 
 #include <glib.h>
 
 #include "hw/hw.h"
+#include "hw/loader.h"
 #include "hw/i386/pc.h"
 #include "hw/i386/apic.h"
 #include "hw/pci/pci.h"
@@ -252,6 +253,7 @@  static void pc_init_pci(QEMUMachineInitArgs *args)
 static void pc_init_pci_1_6(QEMUMachineInitArgs *args)
 {
     has_pci_info = false;
+    rom_file_in_ram = false;
     pc_init_pci(args);
 }
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index ab0aa70..533a2d6 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -28,6 +28,7 @@ 
  * THE SOFTWARE.
  */
 #include "hw/hw.h"
+#include "hw/loader.h"
 #include "sysemu/arch_init.h"
 #include "hw/i2c/smbus.h"
 #include "hw/boards.h"
@@ -221,6 +222,7 @@  static void pc_q35_init(QEMUMachineInitArgs *args)
 static void pc_q35_init_1_6(QEMUMachineInitArgs *args)
 {
     has_pci_info = false;
+    rom_file_in_ram = false;
     pc_q35_init(args);
 }
 
diff --git a/include/hw/loader.h b/include/hw/loader.h
index eb9c9a3..6145736 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -36,6 +36,7 @@  void pstrcpy_targphys(const char *name,
                       hwaddr dest, int buf_size,
                       const char *source);
 
+extern bool rom_file_in_ram;
 
 int rom_add_file(const char *file, const char *fw_dir,
                  hwaddr addr, int32_t bootindex);