[Qemu-devel] [PATCH v10 3/8] loader: Allow a custom AddressSpace when loading ROMs

[Alistair Francis]

When loading ROMs allow the caller to specify an AddressSpace to use for
the load.

Signed-off-by: Alistair Francis <address@hidden>
---
V10:
 - Set the rom address space instead of leaving it NULL
 - Cleanup ordering logic
V9:
 - Fixup the ROM ordering
 - Don't allow address space and memory region to be specified
V8:
 - Introduce an RFC version of AddressSpace loading support

 hw/core/loader.c     | 52 ++++++++++++++++++++++++++++++++++++++++------------
 include/hw/elf_ops.h |  2 +-
 include/hw/loader.h  | 10 ++++++----
 3 files changed, 47 insertions(+), 17 deletions(-)

diff --git a/hw/core/loader.c b/hw/core/loader.c
index 6b61f29..aef7bc9 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -777,6 +777,7 @@ struct Rom {
 
     uint8_t *data;
     MemoryRegion *mr;
+    AddressSpace *as;
     int isrom;
     char *fw_dir;
     char *fw_file;
@@ -788,6 +789,11 @@ struct Rom {
 static FWCfgState *fw_cfg;
 static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
 
+static inline bool rom_order_compare(Rom *rom, Rom *item)
+{
+    return rom->addr >= item->addr;
+}
+
 static void rom_insert(Rom *rom)
 {
     Rom *item;
@@ -796,12 +802,22 @@ static void rom_insert(Rom *rom)
         hw_error ("ROM images must be loaded at startup\n");
     }
 
-    /* list is ordered by load address */
+    /* The user didn't specify an address space, this is the default */
+    if (!rom->as) {
+        rom->as = &address_space_memory;
+    }
+
+    /* List is ordered by load address in the same address space */
     QTAILQ_FOREACH(item, &roms, next) {
-        if (rom->addr >= item->addr)
-            continue;
-        QTAILQ_INSERT_BEFORE(item, rom, next);
-        return;
+        if (rom->as == item->as) {
+            if (rom_order_compare(rom, item)) {
+                QTAILQ_INSERT_AFTER(&roms, item, rom, next);
+                return;
+            } else {
+                QTAILQ_INSERT_BEFORE(item, rom, next);
+                return;
+            }
+        }
     }
     QTAILQ_INSERT_TAIL(&roms, rom, next);
 }
@@ -833,16 +849,25 @@ static void *rom_set_mr(Rom *rom, Object *owner, const 
char *name)
 
 int rom_add_file(const char *file, const char *fw_dir,
                  hwaddr addr, int32_t bootindex,
-                 bool option_rom, MemoryRegion *mr)
+                 bool option_rom, MemoryRegion *mr,
+                 AddressSpace *as)
 {
     MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
     Rom *rom;
     int rc, fd = -1;
     char devpath[100];
 
+    if (as && mr) {
+        fprintf(stderr, "Specifying an Address Space and Memory Region is " \
+                "not valid when loading a rom\n");
+        /* We haven't allocated anything so we don't need any cleanup */
+        return -1;
+    }
+
     rom = g_malloc0(sizeof(*rom));
     rom->name = g_strdup(file);
     rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
+    rom->as = as;
     if (rom->path == NULL) {
         rom->path = g_strdup(file);
     }
@@ -969,7 +994,7 @@ MemoryRegion *rom_add_blob(const char *name, const void 
*blob, size_t len,
  * memory ownership of "data", so we don't have to allocate and copy the 
buffer.
  */
 int rom_add_elf_program(const char *name, void *data, size_t datasize,
-                        size_t romsize, hwaddr addr)
+                        size_t romsize, hwaddr addr, AddressSpace *as)
 {
     Rom *rom;
 
@@ -979,18 +1004,19 @@ int rom_add_elf_program(const char *name, void *data, 
size_t datasize,
     rom->datasize = datasize;
     rom->romsize  = romsize;
     rom->data     = data;
+    rom->as       = as;
     rom_insert(rom);
     return 0;
 }
 
 int rom_add_vga(const char *file)
 {
-    return rom_add_file(file, "vgaroms", 0, -1, true, NULL);
+    return rom_add_file(file, "vgaroms", 0, -1, true, NULL, NULL);
 }
 
 int rom_add_option(const char *file, int32_t bootindex)
 {
-    return rom_add_file(file, "genroms", 0, bootindex, true, NULL);
+    return rom_add_file(file, "genroms", 0, bootindex, true, NULL, NULL);
 }
 
 static void rom_reset(void *unused)
@@ -1008,8 +1034,8 @@ static void rom_reset(void *unused)
             void *host = memory_region_get_ram_ptr(rom->mr);
             memcpy(host, rom->data, rom->datasize);
         } else {
-            cpu_physical_memory_write_rom(&address_space_memory,
-                                          rom->addr, rom->data, rom->datasize);
+            cpu_physical_memory_write_rom(rom->as, rom->addr, rom->data,
+                                          rom->datasize);
         }
         if (rom->isrom) {
             /* rom needs to be written only once */
@@ -1031,12 +1057,13 @@ int rom_check_and_register_reset(void)
     hwaddr addr = 0;
     MemoryRegionSection section;
     Rom *rom;
+    AddressSpace *as = NULL;
 
     QTAILQ_FOREACH(rom, &roms, next) {
         if (rom->fw_file) {
             continue;
         }
-        if (addr > rom->addr) {
+        if ((addr > rom->addr) && (as == rom->as)) {
             fprintf(stderr, "rom: requested regions overlap "
                     "(rom %s. free=0x" TARGET_FMT_plx
                     ", addr=0x" TARGET_FMT_plx ")\n",
@@ -1049,6 +1076,7 @@ int rom_check_and_register_reset(void)
                                      rom->addr, 1);
         rom->isrom = int128_nz(section.size) && 
memory_region_is_rom(section.mr);
         memory_region_unref(section.mr);
+        as = rom->as;
     }
     qemu_register_reset(rom_reset, NULL);
     roms_loaded = 1;
diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h
index 5038c7f..4744d11 100644
--- a/include/hw/elf_ops.h
+++ b/include/hw/elf_ops.h
@@ -405,7 +405,7 @@ static int glue(load_elf, SZ)(const char *name, int fd,
             snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
 
             /* rom_add_elf_program() seize the ownership of 'data' */
-            rom_add_elf_program(label, data, file_size, mem_size, addr);
+            rom_add_elf_program(label, data, file_size, mem_size, addr, NULL);
 
             total_size += mem_size;
             if (addr < low)
diff --git a/include/hw/loader.h b/include/hw/loader.h
index c59673d..815a8d6 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -120,14 +120,14 @@ extern bool rom_file_has_mr;
 
 int rom_add_file(const char *file, const char *fw_dir,
                  hwaddr addr, int32_t bootindex,
-                 bool option_rom, MemoryRegion *mr);
+                 bool option_rom, MemoryRegion *mr, AddressSpace *as);
 MemoryRegion *rom_add_blob(const char *name, const void *blob, size_t len,
                            size_t max_len, hwaddr addr,
                            const char *fw_file_name,
                            FWCfgReadCallback fw_callback,
                            void *callback_opaque);
 int rom_add_elf_program(const char *name, void *data, size_t datasize,
-                        size_t romsize, hwaddr addr);
+                        size_t romsize, hwaddr addr, AddressSpace *as);
 int rom_check_and_register_reset(void);
 void rom_set_fw(FWCfgState *f);
 void rom_set_order_override(int order);
@@ -137,11 +137,13 @@ void *rom_ptr(hwaddr addr);
 void hmp_info_roms(Monitor *mon, const QDict *qdict);
 
 #define rom_add_file_fixed(_f, _a, _i)          \
-    rom_add_file(_f, NULL, _a, _i, false, NULL)
+    rom_add_file(_f, NULL, _a, _i, false, NULL, NULL)
 #define rom_add_blob_fixed(_f, _b, _l, _a)      \
     rom_add_blob(_f, _b, _l, _l, _a, NULL, NULL, NULL)
 #define rom_add_file_mr(_f, _mr, _i)            \
-    rom_add_file(_f, NULL, 0, _i, false, _mr)
+    rom_add_file(_f, NULL, 0, _i, false, _mr, NULL)
+#define rom_add_file_as(_f, _as, _i)            \
+    rom_add_file(_f, NULL, 0, _i, false, NULL, _as)
 
 #define PC_ROM_MIN_VGA     0xc0000
 #define PC_ROM_MIN_OPTION  0xc8000
-- 
2.7.4