efi/libstub: consolidate initrd handling across architectures

Before adding TPM measurement of the initrd contents, refactor the
initrd handling slightly to be more self-contained and consistent.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Link: https://lore.kernel.org/r/20211119114745.1560453-4-ilias.apalodimas@linaro.orgSigned-off-by: Ard Biesheuvel <ardb@kernel.org>

drivers/firmware/efi/libstub/efi-stub-helper.c

@@ -20,10 +20,10 @@
 
 bool efi_nochunk;
 bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
-bool efi_noinitrd;
 int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
 bool efi_novamap;
 
+static bool efi_noinitrd;
 static bool efi_nosoftreserve;
 static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA);
 
@@ -643,8 +643,10 @@ efi_status_t efi_load_initrd(efi_loaded_image_t *image,
 {
 	efi_status_t status;
 
-	if (!load_addr || !load_size)
-		return EFI_INVALID_PARAMETER;
+	if (efi_noinitrd) {
+		*load_addr = *load_size = 0;
+		return EFI_SUCCESS;
+	}
 
 	status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit);
 	if (status == EFI_SUCCESS) {
@@ -655,7 +657,10 @@ efi_status_t efi_load_initrd(efi_loaded_image_t *image,
 		if (status == EFI_SUCCESS && *load_size > 0)
 			efi_info("Loaded initrd from command line option\n");
 	}
-
+	if (status != EFI_SUCCESS) {
+		efi_err("Failed to load initrd: 0x%lx\n", status);
+		*load_addr = *load_size = 0;
+	}
 	return status;
 }
 

drivers/firmware/efi/libstub/efi-stub.c

@@ -134,7 +134,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 	enum efi_secureboot_mode secure_boot;
 	struct screen_info *si;
 	efi_properties_table_t *prop_tbl;
-	unsigned long max_addr;
 
 	efi_system_table = sys_table_arg;
 
@@ -240,13 +239,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 	if (!fdt_addr)
 		efi_info("Generating empty DTB\n");
 
-	if (!efi_noinitrd) {
-		max_addr = efi_get_max_initrd_addr(image_addr);
-		status = efi_load_initrd(image, &initrd_addr, &initrd_size,
-					 ULONG_MAX, max_addr);
-		if (status != EFI_SUCCESS)
-			efi_err("Failed to load initrd!\n");
-	}
+	efi_load_initrd(image, &initrd_addr, &initrd_size, ULONG_MAX,
+			efi_get_max_initrd_addr(image_addr));
 
 	efi_random_get_seed();
 

drivers/firmware/efi/libstub/efistub.h

@@ -31,7 +31,6 @@
 
 extern bool efi_nochunk;
 extern bool efi_nokaslr;
-extern bool efi_noinitrd;
 extern int efi_loglevel;
 extern bool efi_novamap;
 

drivers/firmware/efi/libstub/x86-stub.c

@@ -673,6 +673,7 @@ unsigned long efi_main(efi_handle_t handle,
 	unsigned long bzimage_addr = (unsigned long)startup_32;
 	unsigned long buffer_start, buffer_end;
 	struct setup_header *hdr = &boot_params->hdr;
+	unsigned long addr, size;
 	efi_status_t status;
 
 	efi_system_table = sys_table_arg;
@@ -761,23 +762,16 @@ unsigned long efi_main(efi_handle_t handle,
 	 * arguments will be processed only if image is not NULL, which will be
 	 * the case only if we were loaded via the PE entry point.
 	 */
-	if (!efi_noinitrd) {
-		unsigned long addr, size;
-
-		status = efi_load_initrd(image, &addr, &size,
-					 hdr->initrd_addr_max, ULONG_MAX);
-
-		if (status != EFI_SUCCESS) {
-			efi_err("Failed to load initrd!\n");
+	status = efi_load_initrd(image, &addr, &size, hdr->initrd_addr_max,
+				 ULONG_MAX);
+	if (status != EFI_SUCCESS)
 		goto fail;
-		}
 	if (size > 0) {
 		efi_set_u64_split(addr, &hdr->ramdisk_image,
 				  &boot_params->ext_ramdisk_image);
 		efi_set_u64_split(size, &hdr->ramdisk_size,
 				  &boot_params->ext_ramdisk_size);
 	}
-	}
 
 	/*
 	 * If the boot loader gave us a value for secure_boot then we use that,