The overhead for the OpenBMC firmware images using the a custom U-Boot
is around 2 seconds, which is fine, but with a U-Boot from mainline,
it takes an extra 50 seconds or so to reach Linux. A quick survey on
the number of reads performed on the flash memory region gives the
following figures :
OpenBMC U-Boot 922478 (~ 3.5 MBytes)
Mainline U-Boot 20569977 (~ 80 MBytes)
QEMU must be trashing the TCG TBs and reloading text very often. Some
addresses are read more than 250.000 times. Until we find a solution
to improve boot time, execution from MMIO is not activated by default.
Setting this option also breaks migration compatibility.
Signed-off-by: Cédric Le Goater <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
---
include/hw/arm/aspeed.h | 2 ++
hw/arm/aspeed.c | 44 ++++++++++++++++++++++++++++++++++++-----
2 files changed, 41 insertions(+), 5 deletions(-)
diff --git a/include/hw/arm/aspeed.h b/include/hw/arm/aspeed.h
index 4423cd0cda71..18521484b90e 100644
--- a/include/hw/arm/aspeed.h
+++ b/include/hw/arm/aspeed.h
@@ -19,6 +19,8 @@ typedef struct AspeedBoardState AspeedBoardState;
typedef struct AspeedMachine {
MachineState parent_obj;
+
+ bool mmio_exec;
} AspeedMachine;
#define ASPEED_MACHINE_CLASS(klass) \
diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index 0a7dfd29868b..bf23579fa53d 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -260,11 +260,18 @@ static void aspeed_machine_init(MachineState *machine)
* SoC and 128MB for the AST2500 SoC, which is twice as big as
* needed by the flash modules of the Aspeed machines.
*/
- memory_region_init_rom(boot_rom, OBJECT(bmc), "aspeed.boot_rom",
- fl->size, &error_abort);
- memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
- boot_rom);
- write_boot_rom(drive0, FIRMWARE_ADDR, fl->size, &error_abort);
+ if (ASPEED_MACHINE(machine)->mmio_exec) {
+ memory_region_init_alias(boot_rom, OBJECT(bmc), "aspeed.boot_rom",
+ &fl->mmio, 0, fl->size);
+ memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
+ boot_rom);
+ } else {
+ memory_region_init_rom(boot_rom, OBJECT(bmc), "aspeed.boot_rom",
+ fl->size, &error_abort);
+ memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
+ boot_rom);
+ write_boot_rom(drive0, FIRMWARE_ADDR, fl->size, &error_abort);
+ }
}
aspeed_board_binfo.ram_size = ram_size;
@@ -398,6 +405,30 @@ static void witherspoon_bmc_i2c_init(AspeedBoardState *bmc)
/* Bus 11: TODO ucd90160@64 */
}
+static bool aspeed_get_mmio_exec(Object *obj, Error **errp)
+{
+ return ASPEED_MACHINE(obj)->mmio_exec;
+}
+
+static void aspeed_set_mmio_exec(Object *obj, bool value, Error **errp)
+{
+ ASPEED_MACHINE(obj)->mmio_exec = value;
+}
+
+static void aspeed_machine_instance_init(Object *obj)
+{
+ ASPEED_MACHINE(obj)->mmio_exec = false;
+}
+
+static void aspeed_machine_class_props_init(ObjectClass *oc)
+{
+ object_class_property_add_bool(oc, "execute-in-place",
+ aspeed_get_mmio_exec,
+ aspeed_set_mmio_exec, &error_abort);
+ object_class_property_set_description(oc, "execute-in-place",
+ "boot directly from CE0 flash device",
&error_abort);
+}
+
static void aspeed_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@@ -407,6 +438,8 @@ static void aspeed_machine_class_init(ObjectClass *oc, void
*data)
mc->no_floppy = 1;
mc->no_cdrom = 1;
mc->no_parallel = 1;
+
+ aspeed_machine_class_props_init(oc);
}
static void aspeed_machine_palmetto_class_init(ObjectClass *oc, void *data)
@@ -549,6 +582,7 @@ static const TypeInfo aspeed_machine_types[] = {
.name = TYPE_ASPEED_MACHINE,
.parent = TYPE_MACHINE,
.instance_size = sizeof(AspeedMachine),
+ .instance_init = aspeed_machine_instance_init,
.class_size = sizeof(AspeedMachineClass),
.class_init = aspeed_machine_class_init,
.abstract = true,