x86: efi_loader: Ensure the SMBIOS tables are sent via EFI

The EFI-loader code has not been fully converted to use bloblist, so
relies on the SMBIOS-table address being set in global_data.

Set this up in write_tables() so that the SMBIOS tables are actually
available.

Enable the command for x86 QEMU so that the SMBIOS tests actually run.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 83ce35d6eb ("emulation: Use bloblist to hold tables")
Reported-by: Niklas Sombert <niklas.sombert@uni-duesseldorf.de>

arch/x86/lib/tables.c

@@ -126,6 +126,8 @@ int write_tables(void)
 			use_high = true;
 			if (!gd->arch.table_start_high)
 				gd->arch.table_start_high = rom_addr;
+			if (table->tag == BLOBLISTT_SMBIOS_TABLES)
+				gd_set_smbios_start(rom_addr);
 		}
 		rom_table_end = table->write(rom_addr);
 		if (!rom_table_end) {

board/emulation/qemu-x86/Kconfig

@@ -23,5 +23,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	imply VIRTIO_PCI
 	imply VIRTIO_NET
 	imply VIRTIO_BLK
+	imply CMD_SMBIOS
 
 endif

dts/Kconfig

@@ -190,7 +190,7 @@ config OF_BOARD
 	  earlier stage should enable OF_HAS_PRIOR_STAGE.
 
 config OF_HAS_PRIOR_STAGE
-	bool "Device tree comes from prior-stage firmware"
+	bool
 	help
 	  Indicates that a prior stage of the firmware (before U-Boot proper)
 	  makes use of device tree and this board normally boots with that prior
@@ -205,13 +205,8 @@ config OF_HAS_PRIOR_STAGE
 	  development purposes, but it is not recommended, and likely will not
 	  even work, for production systems.
 
-	  Note: This option can be updated in the board's defconfig file if
-	  needed. E.g. for QEMU to support FIT validation the devicetree must
-	  include a public key.
-
-	  See also this for context:
-
-	  https://patchwork.kernel.org/project/qemu-devel/patch/20210926183410.256484-1-sjg@chromium.org/#24481799
+	  Note: This option must be set in Kconfig and cannot be enabled or
+	  disabled in the board's defconfig file.
 
 config OF_OMIT_DTB
 	bool "Omit the device tree output when building"

lib/efi_loader/efi_smbios.c

@@ -35,6 +35,7 @@ efi_status_t efi_smbios_register(void)
 	void *buf;
 
 	addr = gd_smbios_start();
+	printf("register %lx\n", addr);
 	if (!addr) {
 		log_err("No SMBIOS tables to install\n");
 		return EFI_NOT_FOUND;