acpi: Move maximum size logic into acpi_add_rom_blob()

We want to have safety margins for all tables based on the table type.
Let's move the maximum size logic into acpi_add_rom_blob() and make it
dependent on the table name, so we don't have to replicate for each and
every instance that creates such tables.

Suggested-by: Laszlo Ersek <lersek@redhat.com>
Cc: Alistair Francis <alistair.francis@xilinx.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Shannon Zhao <shannon.zhaosl@gmail.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210304105554.121674-4-david@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/utils.c

@@ -27,9 +27,17 @@
 #include "hw/loader.h"
 
 MemoryRegion *acpi_add_rom_blob(FWCfgCallback update, void *opaque,
-                                GArray *blob, const char *name,
-                                uint64_t max_size)
+                                GArray *blob, const char *name)
 {
+    uint64_t max_size = 0;
+
+    /* Reserve RAM space for tables: add another order of magnitude. */
+    if (!strcmp(name, ACPI_BUILD_TABLE_FILE)) {
+        max_size = 0x200000;
+    } else if (!strcmp(name, ACPI_BUILD_LOADER_FILE)) {
+        max_size = 0x10000;
+    }
+
     return rom_add_blob(name, blob->data, acpi_data_len(blob), max_size, -1,
                         name, update, opaque, NULL, true);
 }

hw/arm/virt-acpi-build.c

@@ -859,14 +859,13 @@ void virt_acpi_setup(VirtMachineState *vms)
     /* Now expose it all to Guest */
     build_state->table_mr = acpi_add_rom_blob(virt_acpi_build_update,
                                               build_state, tables.table_data,
-                                              ACPI_BUILD_TABLE_FILE,
-                                              ACPI_BUILD_TABLE_MAX_SIZE);
+                                              ACPI_BUILD_TABLE_FILE);
     assert(build_state->table_mr != NULL);
 
-    build_state->linker_mr =
-        acpi_add_rom_blob(virt_acpi_build_update, build_state,
-                          tables.linker->cmd_blob, ACPI_BUILD_LOADER_FILE,
-                          ACPI_BUILD_LOADER_MAX_SIZE);
+    build_state->linker_mr = acpi_add_rom_blob(virt_acpi_build_update,
+                                               build_state,
+                                               tables.linker->cmd_blob,
+                                               ACPI_BUILD_LOADER_FILE);
 
     fw_cfg_add_file(vms->fw_cfg, ACPI_BUILD_TPMLOG_FILE, tables.tcpalog->data,
                     acpi_data_len(tables.tcpalog));
@@ -880,7 +879,7 @@ void virt_acpi_setup(VirtMachineState *vms)
 
     build_state->rsdp_mr = acpi_add_rom_blob(virt_acpi_build_update,
                                              build_state, tables.rsdp,
-                                             ACPI_BUILD_RSDP_FILE, 0);
+                                             ACPI_BUILD_RSDP_FILE);
 
     qemu_register_reset(virt_acpi_build_reset, build_state);
     virt_acpi_build_reset(build_state);

hw/i386/acpi-build.c

@@ -2628,14 +2628,12 @@ void acpi_setup(void)
     /* Now expose it all to Guest */
     build_state->table_mr = acpi_add_rom_blob(acpi_build_update,
                                               build_state, tables.table_data,
-                                              ACPI_BUILD_TABLE_FILE,
-                                              ACPI_BUILD_TABLE_MAX_SIZE);
+                                              ACPI_BUILD_TABLE_FILE);
     assert(build_state->table_mr != NULL);
 
     build_state->linker_mr =
         acpi_add_rom_blob(acpi_build_update, build_state,
-                          tables.linker->cmd_blob, ACPI_BUILD_LOADER_FILE,
-                          ACPI_BUILD_LOADER_MAX_SIZE);
+                          tables.linker->cmd_blob, ACPI_BUILD_LOADER_FILE);
 
     fw_cfg_add_file(x86ms->fw_cfg, ACPI_BUILD_TPMLOG_FILE,
                     tables.tcpalog->data, acpi_data_len(tables.tcpalog));
@@ -2674,7 +2672,7 @@ void acpi_setup(void)
         build_state->rsdp = NULL;
         build_state->rsdp_mr = acpi_add_rom_blob(acpi_build_update,
                                                  build_state, tables.rsdp,
-                                                 ACPI_BUILD_RSDP_FILE, 0);
+                                                 ACPI_BUILD_RSDP_FILE);
     }
 
     qemu_register_reset(acpi_build_reset, build_state);

hw/i386/acpi-microvm.c

@@ -249,16 +249,12 @@ void acpi_setup_microvm(MicrovmMachineState *mms)
     acpi_build_microvm(&tables, mms);
 
     /* Now expose it all to Guest */
-    acpi_add_rom_blob(acpi_build_no_update, NULL,
-                      tables.table_data,
-                      ACPI_BUILD_TABLE_FILE,
-                      ACPI_BUILD_TABLE_MAX_SIZE);
-    acpi_add_rom_blob(acpi_build_no_update, NULL,
-                      tables.linker->cmd_blob,
-                      ACPI_BUILD_LOADER_FILE, ACPI_BUILD_LOADER_MAX_SIZE);
-    acpi_add_rom_blob(acpi_build_no_update, NULL,
-                      tables.rsdp,
-                      ACPI_BUILD_RSDP_FILE, 0);
+    acpi_add_rom_blob(acpi_build_no_update, NULL, tables.table_data,
+                      ACPI_BUILD_TABLE_FILE);
+    acpi_add_rom_blob(acpi_build_no_update, NULL, tables.linker->cmd_blob,
+                      ACPI_BUILD_LOADER_FILE);
+    acpi_add_rom_blob(acpi_build_no_update, NULL, tables.rsdp,
+                      ACPI_BUILD_RSDP_FILE);
 
     acpi_build_tables_cleanup(&tables, false);
 }

include/hw/acpi/aml-build.h

@@ -4,10 +4,6 @@
 #include "hw/acpi/acpi-defs.h"
 #include "hw/acpi/bios-linker-loader.h"
 
-/* Reserve RAM space for tables: add another order of magnitude. */
-#define ACPI_BUILD_TABLE_MAX_SIZE         0x200000
-#define ACPI_BUILD_LOADER_MAX_SIZE        0x10000
-
 #define ACPI_BUILD_APPNAME6 "BOCHS "
 #define ACPI_BUILD_APPNAME8 "BXPC    "
 

include/hw/acpi/utils.h

@@ -4,6 +4,5 @@
 #include "hw/nvram/fw_cfg.h"
 
 MemoryRegion *acpi_add_rom_blob(FWCfgCallback update, void *opaque,
-                                GArray *blob, const char *name,
-                                uint64_t max_size);
+                                GArray *blob, const char *name);
 #endif