Merge tag 'efi-2020-07-rc3' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-07-rc3

A series of patches introduces the possibility to manage UEFI variables
via an OP-TEE module. CONFIG_EFI_MM_COMM_TEE enables this. If this
option is not specified the U-Boot behavior remains unchanged. A defconfig
is provided for compile testing (lx2160ardb_tfa_stmm_defconfig).

An incorrect UEFI memory allocation for fsl-layerscape is fixed

22 files changed, 1117 insertions, 55 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index d671124797..8add9d4c2a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -635,6 +635,12 @@ F:	cmd/efidebug.c
 F:	cmd/nvedit_efi.c
 F:	tools/file2include.c
 
+EFI VARIABLES VIA OP-TEE
+M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>
+S:	Maintained
+F:	lib/efi_loader/efi_variable_tee.c
+F:	include/mm_communication.h
+
 ENVIRONMENT
 M:	Joe Hershberger <joe.hershberger@ni.com>
 R:	Wolfgang Denk <wd@denx.de>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index b3f5c2f641..2cf3f4bb98 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -1529,9 +1529,8 @@ int dram_init_banksize(void)
 void efi_add_known_memory(void)
 {
 	int i;
-	phys_addr_t ram_start, start;
+	phys_addr_t ram_start;
 	phys_size_t ram_size;
-	u64 pages;
 
 	/* Add RAM */
 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
@@ -1549,11 +1548,8 @@ void efi_add_known_memory(void)
 		    gd->arch.resv_ram < ram_start + ram_size)
 			ram_size = gd->arch.resv_ram - ram_start;
 #endif
-		start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
-		pages = (ram_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
-
-		efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
-				   false);
+		efi_add_memory_map(ram_start, ram_size,
+				   EFI_CONVENTIONAL_MEMORY);
 	}
 }
 #endif
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
index 3bbad827cb..0696ea6d35 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
@@ -146,9 +146,8 @@ remove_psci_node:
 	fdt_add_mem_rsv(blob, (uintptr_t)&secondary_boot_code,
 			*boot_code_size);
 #if CONFIG_IS_ENABLED(EFI_LOADER)
-	efi_add_memory_map((uintptr_t)&secondary_boot_code,
-			   ALIGN(*boot_code_size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
-			   EFI_RESERVED_MEMORY_TYPE, false);
+	efi_add_memory_map((uintptr_t)&secondary_boot_code, *boot_code_size,
+			   EFI_RESERVED_MEMORY_TYPE);
 #endif
 }
 #endif
diff --git a/arch/arm/dts/fsl-lx2160a.dtsi b/arch/arm/dts/fsl-lx2160a.dtsi
index 17ecdc569b..73d04db7e4 100644
--- a/arch/arm/dts/fsl-lx2160a.dtsi
+++ b/arch/arm/dts/fsl-lx2160a.dtsi
@@ -428,4 +428,10 @@
 		#size-cells = <0>;
 		status = "disabled";
 	};
+	firmware {
+		optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+		};
+	};
 };
diff --git a/arch/arm/mach-meson/board-common.c b/arch/arm/mach-meson/board-common.c
index bc4c92074c..747791b10e 100644
--- a/arch/arm/mach-meson/board-common.c
+++ b/arch/arm/mach-meson/board-common.c
@@ -69,11 +69,8 @@ void meson_board_add_reserved_memory(void *fdt, u64 start, u64 size)
 	if (ret)
 		printf("Could not reserve zone @ 0x%llx\n", start);
 
-	if (IS_ENABLED(CONFIG_EFI_LOADER)) {
-		efi_add_memory_map(start,
-				   ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
-				   EFI_RESERVED_MEMORY_TYPE, false);
-	}
+	if (IS_ENABLED(CONFIG_EFI_LOADER))
+		efi_add_memory_map(start, size, EFI_RESERVED_MEMORY_TYPE);
 }
 
 int meson_generate_serial_ethaddr(void)
diff --git a/arch/x86/lib/e820.c b/arch/x86/lib/e820.c
index 26da4d2f27..1f20c5c8c6 100644
--- a/arch/x86/lib/e820.c
+++ b/arch/x86/lib/e820.c
@@ -41,7 +41,7 @@ void efi_add_known_memory(void)
 {
 	struct e820_entry e820[E820MAX];
 	unsigned int i, num;
-	u64 start, pages, ram_top;
+	u64 start, ram_top;
 	int type;
 
 	num = install_e820_map(ARRAY_SIZE(e820), e820);
@@ -77,9 +77,7 @@ void efi_add_known_memory(void)
 							start + e820[i].size,
 							ram_top);
 		} else {
-			pages = ALIGN(e820[i].size, EFI_PAGE_SIZE)
-				>> EFI_PAGE_SHIFT;
-			efi_add_memory_map(start, pages, type, false);
+			efi_add_memory_map(start, e820[i].size, type);
 		}
 	}
 }
diff --git a/board/freescale/lx2160a/MAINTAINERS b/board/freescale/lx2160a/MAINTAINERS
index 47ae04c91a..9fe79c0ef7 100644
--- a/board/freescale/lx2160a/MAINTAINERS
+++ b/board/freescale/lx2160a/MAINTAINERS
@@ -5,6 +5,7 @@ F:	board/freescale/lx2160a/
 F:	include/configs/lx2160a_common.h
 F:	include/configs/lx2160ardb.h
 F:	configs/lx2160ardb_tfa_defconfig
+F:	configs/lx2160ardb_tfa_stmm_defconfig
 F:	arch/arm/dts/fsl-lx2160a-rdb.dts
 
 LX2160ARDB_SECURE_BOOT BOARD
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index 0206a093d4..45caa4d49e 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -489,8 +489,8 @@ int ft_board_setup(void *blob, bd_t *bd)
 
 #ifdef CONFIG_EFI_LOADER
 	/* Reserve the spin table */
-	efi_add_memory_map(0, CONFIG_RPI_EFI_NR_SPIN_PAGES,
-			   EFI_RESERVED_MEMORY_TYPE, 0);
+	efi_add_memory_map(0, CONFIG_RPI_EFI_NR_SPIN_PAGES << EFI_PAGE_SHIFT,
+			   EFI_RESERVED_MEMORY_TYPE);
 #endif
 
 	return 0;
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 06573b14e9..9849eb4f99 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -151,14 +151,10 @@ done:
 
 static void efi_reserve_memory(u64 addr, u64 size)
 {
-	u64 pages;
-
 	/* Convert from sandbox address space. */
 	addr = (uintptr_t)map_sysmem(addr, 0);
-	pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
-	addr &= ~EFI_PAGE_MASK;
-	if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
-			       false) != EFI_SUCCESS)
+	if (efi_add_memory_map(addr, size,
+			       EFI_RESERVED_MEMORY_TYPE) != EFI_SUCCESS)
 		printf("Reserved memory mapping failed addr %llx size %llx\n",
 		       addr, size);
 }
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index 5cc0a41af3..f020d95dbb 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -1165,6 +1165,58 @@ static int do_efi_test(cmd_tbl_t *cmdtp, int flag,
 	return cp->cmd(cmdtp, flag, argc, argv);
 }
 
+/**
+ * do_efi_query_info() - QueryVariableInfo EFI service
+ *
+ * @cmdtp:	Command table
+ * @flag:	Command flag
+ * @argc:	Number of arguments
+ * @argv:	Argument array
+ * Return:	CMD_RET_SUCCESS on success,
+ *		CMD_RET_USAGE or CMD_RET_FAILURE on failure
+ *
+ * Implement efidebug "test" sub-command.
+ */
+
+static int do_efi_query_info(cmd_tbl_t *cmdtp, int flag,
+			     int argc, char * const argv[])
+{
+	efi_status_t ret;
+	u32 attr = 0;
+	u64 max_variable_storage_size;
+	u64 remain_variable_storage_size;
+	u64 max_variable_size;
+	int i;
+
+	for (i = 1; i < argc; i++) {
+		if (!strcmp(argv[i], "-bs"))
+			attr |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
+		else if (!strcmp(argv[i], "-rt"))
+			attr |= EFI_VARIABLE_RUNTIME_ACCESS;
+		else if (!strcmp(argv[i], "-nv"))
+			attr |= EFI_VARIABLE_NON_VOLATILE;
+		else if (!strcmp(argv[i], "-at"))
+			attr |=
+				EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
+	}
+
+	ret = EFI_CALL(efi_query_variable_info(attr,
+					       &max_variable_storage_size,
+					       &remain_variable_storage_size,
+					       &max_variable_size));
+	if (ret != EFI_SUCCESS) {
+		printf("Error: Cannot query UEFI variables, r = %lu\n",
+		       ret & ~EFI_ERROR_MASK);
+		return CMD_RET_FAILURE;
+	}
+
+	printf("Max storage size %llu\n", max_variable_storage_size);
+	printf("Remaining storage size %llu\n", remain_variable_storage_size);
+	printf("Max variable size %llu\n", max_variable_size);
+
+	return CMD_RET_SUCCESS;
+}
+
 static cmd_tbl_t cmd_efidebug_sub[] = {
 	U_BOOT_CMD_MKENT(boot, CONFIG_SYS_MAXARGS, 1, do_efi_boot_opt, "", ""),
 	U_BOOT_CMD_MKENT(devices, CONFIG_SYS_MAXARGS, 1, do_efi_show_devices,
@@ -1181,6 +1233,8 @@ static cmd_tbl_t cmd_efidebug_sub[] = {
 			 "", ""),
 	U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_efi_test,
 			 "", ""),
+	U_BOOT_CMD_MKENT(query, CONFIG_SYS_MAXARGS, 1, do_efi_query_info,
+			 "", ""),
 };
 
 /**
@@ -1252,7 +1306,9 @@ static char efidebug_help_text[] =
 	"efidebug tables\n"
 	"  - show UEFI configuration tables\n"
 	"efidebug test bootmgr\n"
-	"  - run simple bootmgr for test\n";
+	"  - run simple bootmgr for test\n"
+	"efidebug query [-nv][-bs][-rt][-at]\n"
+	"  - show size of UEFI variables store\n";
 #endif
 
 U_BOOT_CMD(
diff --git a/configs/lx2160ardb_tfa_stmm_defconfig b/configs/lx2160ardb_tfa_stmm_defconfig
new file mode 100644
index 0000000000..5f181a3868
--- /dev/null
+++ b/configs/lx2160ardb_tfa_stmm_defconfig
@@ -0,0 +1,85 @@
+CONFIG_ARM=y
+CONFIG_GIC_V3_ITS=y
+CONFIG_TARGET_LX2160ARDB=y
+CONFIG_TFABOOT=y
+CONFIG_SYS_TEXT_BASE=0x82000000
+CONFIG_SYS_MALLOC_F_LEN=0x6000
+CONFIG_ENV_SIZE=0x2000
+CONFIG_ENV_OFFSET=0x500000
+CONFIG_ENV_SECT_SIZE=0x20000
+CONFIG_DM_GPIO=y
+CONFIG_EMC2305=y
+CONFIG_FSPI_AHB_EN_4BYTE=y
+CONFIG_NR_DRAM_BANKS=3
+CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT=y
+CONFIG_SEC_FIRMWARE_ARMV8_PSCI=y
+CONFIG_AHCI=y
+CONFIG_FIT_VERBOSE=y
+CONFIG_OF_BOARD_SETUP=y
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_BOOTDELAY=10
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttyAMA0,115200 root=/dev/ram0 earlycon=pl011,mmio32,0x21c0000 ramdisk_size=0x2000000 default_hugepagesz=1024m hugepagesz=1024m hugepages=2 pci=pcie_bus_perf"
+# CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_MISC_INIT_R=y
+CONFIG_CMD_GREPENV=y
+CONFIG_CMD_NVEDIT_EFI=y
+CONFIG_CMD_EEPROM=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PCI=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_EFIDEBUG=y
+CONFIG_MP=y
+CONFIG_OF_CONTROL=y
+CONFIG_OF_BOARD_FIXUP=y
+CONFIG_DEFAULT_DEVICE_TREE="fsl-lx2160a-rdb"
+CONFIG_ENV_IS_IN_MMC=y
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_ENV_ADDR=0x20500000
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_DM=y
+CONFIG_SATA_CEVA=y
+CONFIG_FSL_CAAM=y
+CONFIG_DM_I2C=y
+CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
+CONFIG_I2C_DEFAULT_BUS_NUMBER=0
+CONFIG_DM_MMC=y
+CONFIG_SUPPORT_EMMC_RPMB=y
+CONFIG_FSL_ESDHC=y
+CONFIG_MTD=y
+CONFIG_DM_SPI_FLASH=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
+CONFIG_PHYLIB=y
+CONFIG_PHY_AQUANTIA=y
+CONFIG_PHY_ATHEROS=y
+CONFIG_PHY_CORTINA=y
+CONFIG_DM_ETH=y
+CONFIG_DM_MDIO=y
+CONFIG_E1000=y
+CONFIG_FSL_LS_MDIO=y
+CONFIG_PCI=y
+CONFIG_DM_PCI=y
+CONFIG_DM_PCI_COMPAT=y
+CONFIG_PCIE_LAYERSCAPE=y
+CONFIG_PCIE_LAYERSCAPE_GEN4=y
+CONFIG_DM_RTC=y
+CONFIG_RTC_PCF2127=y
+CONFIG_DM_SCSI=y
+CONFIG_DM_SERIAL=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_NXP_FSPI=y
+CONFIG_TEE=y
+CONFIG_OPTEE=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_DWC3=y
+CONFIG_EFI_LOADER_BOUNCE_BUFFER=y
+CONFIG_EFI_MM_COMM_TEE=y
diff --git a/doc/uefi/uefi.rst b/doc/uefi/uefi.rst
index 4fda00d687..03d6fd0c6a 100644
--- a/doc/uefi/uefi.rst
+++ b/doc/uefi/uefi.rst
@@ -188,6 +188,23 @@ on the sandbox
     cd <U-Boot source directory>
     pytest.py test/py/tests/test_efi_secboot/test_signed.py --bd sandbox
 
+Using OP-TEE for EFI variables
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Instead of implementing UEFI variable services inside U-Boot they can
+also be provided in the secure world by a module for OP-TEE[1]. The
+interface between U-Boot and OP-TEE for variable services is enabled by
+CONFIG_EFI_MM_COMM_TEE=y.
+
+Tianocore EDK II's standalone management mode driver for variables can
+be linked to OP-TEE for this purpose. This module uses the Replay
+Protected Memory Block (RPMB) of an eMMC device for persisting
+non-volatile variables. When calling the variable services via the
+OP-TEE API U-Boot's OP-TEE supplicant relays calls to the RPMB driver
+which has to be enabled via CONFIG_SUPPORT_EMMC_RPMB=y.
+
+[1] https://optee.readthedocs.io/ - OP-TEE documentation
+
 Executing the boot manager
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/drivers/video/meson/meson_vpu.c b/drivers/video/meson/meson_vpu.c
index aa8c0a962f..ed47192bf6 100644
--- a/drivers/video/meson/meson_vpu.c
+++ b/drivers/video/meson/meson_vpu.c
@@ -195,8 +195,8 @@ void meson_vpu_rsv_fb(void *fdt)
 		return;
 
 #if defined(CONFIG_EFI_LOADER)
-	efi_add_memory_map(meson_fb.base, meson_fb.fb_size >> EFI_PAGE_SHIFT,
-			   EFI_RESERVED_MEMORY_TYPE, false);
+	efi_add_memory_map(meson_fb.base, meson_fb.fb_size,
+			   EFI_RESERVED_MEMORY_TYPE);
 #endif
 #if defined(CONFIG_VIDEO_DT_SIMPLEFB)
 	meson_vpu_setup_simplefb(fdt);
diff --git a/drivers/video/sunxi/sunxi_de2.c b/drivers/video/sunxi/sunxi_de2.c
index 8333ddc44c..c6e7a35338 100644
--- a/drivers/video/sunxi/sunxi_de2.c
+++ b/drivers/video/sunxi/sunxi_de2.c
@@ -224,9 +224,9 @@ static int sunxi_de2_init(struct udevice *dev, ulong fbbase,
 
 #ifdef CONFIG_EFI_LOADER
 	efi_add_memory_map(fbbase,
-			   ALIGN(timing.hactive.typ * timing.vactive.typ *
-			   (1 << l2bpp) / 8, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
-			   EFI_RESERVED_MEMORY_TYPE, false);
+			   timing.hactive.typ * timing.vactive.typ *
+			   (1 << l2bpp) / 8,
+			   EFI_RESERVED_MEMORY_TYPE);
 #endif
 
 	return 0;
diff --git a/drivers/video/sunxi/sunxi_display.c b/drivers/video/sunxi/sunxi_display.c
index 40ee009f62..c4c1d1b8d3 100644
--- a/drivers/video/sunxi/sunxi_display.c
+++ b/drivers/video/sunxi/sunxi_display.c
@@ -1196,10 +1196,8 @@ void *video_hw_init(void)
 	sunxi_engines_init();
 
 #ifdef CONFIG_EFI_LOADER
-	efi_add_memory_map(gd->fb_base,
-			   ALIGN(sunxi_display.fb_size, EFI_PAGE_SIZE) >>
-			   EFI_PAGE_SHIFT,
-			   EFI_RESERVED_MEMORY_TYPE, false);
+	efi_add_memory_map(gd->fb_base, sunxi_display.fb_size,
+			   EFI_RESERVED_MEMORY_TYPE);
 #endif
 
 	fb_dma_addr = gd->fb_base - CONFIG_SYS_SDRAM_BASE;
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 0e924ad109..75c20e4679 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -545,8 +545,7 @@ efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
 				efi_uintn_t *descriptor_size,
 				uint32_t *descriptor_version);
 /* Adds a range into the EFI memory map */
-efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
-				bool overlap_only_ram);
+efi_status_t efi_add_memory_map(u64 start, u64 size, int memory_type);
 /* Adds a conventional range into the EFI memory map */
 efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
 					     u64 ram_top);
diff --git a/include/mm_communication.h b/include/mm_communication.h
new file mode 100644
index 0000000000..193c4d1578
--- /dev/null
+++ b/include/mm_communication.h
@@ -0,0 +1,208 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  Headers for EFI variable service via StandAloneMM, EDK2 application running
+ *  in OP-TEE
+ *
+ *  Copyright (c) 2017, Intel Corporation. All rights reserved.
+ *  Copyright (C) 2020 Linaro Ltd. <sughosh.ganu@linaro.org>
+ *  Copyright (C) 2020 Linaro Ltd. <ilias.apalodimas@linaro.org>
+ */
+
+#ifndef _MM_COMMUNICATION_H_
+#define _MM_COMMUNICATION_H_
+
+#include <part_efi.h>
+
+/*
+ * Interface to the pseudo Trusted Application (TA), which provides a
+ * communication channel with the Standalone MM (Management Mode)
+ * Secure Partition running at Secure-EL0
+ */
+
+#define PTA_STMM_CMDID_COMMUNICATE 0
+
+/* OP-TEE is using big endian GUIDs while UEFI uses little endian ones */
+#define PTA_STMM_UUID { 0xed32d533, 0x99e6, 0x4209, {\
+			0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7 } }
+
+#define EFI_MM_VARIABLE_GUID \
+	EFI_GUID(0xed32d533, 0x99e6, 0x4209, \
+		 0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
+
+/* Defined in EDK2 MdePkg/Include/Protocol/MmCommunication.h */
+
+/**
+ * struct efi_mm_communicate_header - Header used for SMM variable communication
+
+ * @header_guid:  header use for disambiguation of content
+ * @message_len:  length of the message. Does not include the size of the
+ *                header
+ * @data:         payload of the message
+ *
+ * Defined in EDK2 as EFI_MM_COMMUNICATE_HEADER.
+ * To avoid confusion in interpreting frames, the communication buffer should
+ * always begin with efi_mm_communicate_header.
+ */
+struct efi_mm_communicate_header {
+	efi_guid_t header_guid;
+	size_t     message_len;
+	u8         data[];
+};
+
+#define MM_COMMUNICATE_HEADER_SIZE \
+	(sizeof(struct efi_mm_communicate_header))
+
+/* Defined in EDK2 ArmPkg/Include/IndustryStandard/ArmStdSmc.h */
+
+/* MM return error codes */
+#define ARM_SMC_MM_RET_SUCCESS              0
+#define ARM_SMC_MM_RET_NOT_SUPPORTED       -1
+#define ARM_SMC_MM_RET_INVALID_PARAMS      -2
+#define ARM_SMC_MM_RET_DENIED              -3
+#define ARM_SMC_MM_RET_NO_MEMORY           -4
+
+/* Defined in EDK2 MdeModulePkg/Include/Guid/SmmVariableCommon.h */
+
+#define SMM_VARIABLE_FUNCTION_GET_VARIABLE  1
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
+ */
+#define SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME  2
+/*
+ * The payload for this function is SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
+ */
+#define SMM_VARIABLE_FUNCTION_SET_VARIABLE  3
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
+ */
+#define SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO  4
+/*
+ * It is a notify event, no extra payload for this function.
+ */
+#define SMM_VARIABLE_FUNCTION_READY_TO_BOOT  5
+/*
+ * It is a notify event, no extra payload for this function.
+ */
+#define SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE  6
+/*
+ * The payload for this function is VARIABLE_INFO_ENTRY.
+ * The GUID in EFI_SMM_COMMUNICATE_HEADER is gEfiSmmVariableProtocolGuid.
+ */
+#define SMM_VARIABLE_FUNCTION_GET_STATISTICS  7
+/*
+ * The payload for this function is SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE
+ */
+#define SMM_VARIABLE_FUNCTION_LOCK_VARIABLE   8
+
+#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_SET  9
+
+#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_GET  10
+
+#define SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE  11
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_RUNTIME_VARIABLE_CACHE_CONTEXT
+ */
+#define SMM_VARIABLE_FUNCTION_INIT_RUNTIME_VARIABLE_CACHE_CONTEXT 12
+
+#define SMM_VARIABLE_FUNCTION_SYNC_RUNTIME_CACHE  13
+/*
+ * The payload for this function is
+ * SMM_VARIABLE_COMMUNICATE_GET_RUNTIME_CACHE_INFO
+ */
+#define SMM_VARIABLE_FUNCTION_GET_RUNTIME_CACHE_INFO  14
+
+/**
+ * struct smm_variable_communicate_header - Used for SMM variable communication
+
+ * @function:     function to call in Smm.
+ * @ret_status:   return status
+ * @data:         payload
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_HEADER.
+ */
+struct smm_variable_communicate_header {
+	efi_uintn_t  function;
+	efi_status_t ret_status;
+	u8           data[];
+};
+
+#define MM_VARIABLE_COMMUNICATE_SIZE \
+	(sizeof(struct smm_variable_communicate_header))
+
+/**
+ * struct smm_variable_access - Used to communicate with StMM by
+ *                              SetVariable and GetVariable.
+
+ * @guid:         vendor GUID
+ * @data_size:    size of EFI variable data
+ * @name_size:    size of EFI name
+ * @attr:         attributes
+ * @name:         variable name
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
+ *
+ */
+struct smm_variable_access {
+	efi_guid_t  guid;
+	efi_uintn_t data_size;
+	efi_uintn_t name_size;
+	u32         attr;
+	u16         name[];
+};
+
+#define MM_VARIABLE_ACCESS_HEADER_SIZE \
+	(sizeof(struct smm_variable_access))
+/**
+ * struct smm_variable_payload_size - Used to get the max allowed
+ *                                    payload used in StMM.
+ *
+ * @size:  size to fill in
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_GET_PAYLOAD_SIZE.
+ *
+ */
+struct smm_variable_payload_size {
+	efi_uintn_t size;
+};
+
+/**
+ * struct smm_variable_getnext - Used to communicate with StMM for
+ *                               GetNextVariableName.
+ *
+ * @guid:       vendor GUID
+ * @name_size:  size of the name of the variable
+ * @name:       variable name
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
+ */
+struct smm_variable_getnext {
+	efi_guid_t  guid;
+	efi_uintn_t name_size;
+	u16         name[];
+};
+
+#define MM_VARIABLE_GET_NEXT_HEADER_SIZE \
+	(sizeof(struct smm_variable_getnext))
+
+/**
+ * struct smm_variable_query_info - Used to communicate with StMM for
+ *                                  QueryVariableInfo.
+ *
+ * @max_variable_storage:        max available storage
+ * @remaining_variable_storage:  remaining available storage
+ * @max_variable_size:           max variable supported size
+ * @attr:                        attributes to query storage for
+ *
+ * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
+ */
+struct smm_variable_query_info {
+	u64 max_variable_storage;
+	u64 remaining_variable_storage;
+	u64 max_variable_size;
+	u32 attr;
+};
+
+#endif /* _MM_COMMUNICATION_H_ */
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 1cfa24ffcf..aad37b7155 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -164,4 +164,13 @@ config EFI_SECURE_BOOT
 	  it is signed with a trusted key. To do that, you need to install,
 	  at least, PK, KEK and db.
 
+config EFI_MM_COMM_TEE
+	bool "UEFI variables storage service via OP-TEE"
+	depends on OPTEE
+	default n
+	help
+	  If OP-TEE is present and running StandAloneMM, dispatch all UEFI variable
+	  related operations to that. The application will verify, authenticate and
+	  store the variables on an RPMB.
+
 endif
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 84d61df55b..57c7e66ea0 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -35,7 +35,11 @@ obj-y += efi_root_node.o
 obj-y += efi_runtime.o
 obj-y += efi_setup.o
 obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL2) += efi_unicode_collation.o
+ifeq ($(CONFIG_EFI_MM_COMM_TEE),y)
+obj-y += efi_variable_tee.o
+else
 obj-y += efi_variable.o
+endif
 obj-y += efi_watchdog.o
 obj-$(CONFIG_LCD) += efi_gop.o
 obj-$(CONFIG_DM_VIDEO) += efi_gop.o
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index 97d90f069a..c0cf1d9126 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -229,7 +229,7 @@ static s64 efi_mem_carve_out(struct efi_mem_list *map,
 }
 
 /**
- * efi_add_memory_map() - add memory area to the memory map
+ * efi_add_memory_map_pg() - add pages to the memory map
  *
  * @start:		start address, must be a multiple of EFI_PAGE_SIZE
  * @pages:		number of pages to add
@@ -237,8 +237,9 @@ static s64 efi_mem_carve_out(struct efi_mem_list *map,
  * @overlap_only_ram:	the memory area must overlap existing
  * Return:		status code
  */
-efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
-				bool overlap_only_ram)
+static efi_status_t efi_add_memory_map_pg(u64 start, u64 pages,
+					  int memory_type,
+					  bool overlap_only_ram)
 {
 	struct list_head *lhandle;
 	struct efi_mem_list *newlist;
@@ -344,6 +345,28 @@ efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 }
 
 /**
+ * efi_add_memory_map() - add memory area to the memory map
+ *
+ * @start:		start address of the memory area
+ * @size:		length in bytes of the memory area
+ * @memory_type:	type of memory added
+ *
+ * Return:		status code
+ *
+ * This function automatically aligns the start and size of the memory area
+ * to EFI_PAGE_SIZE.
+ */
+efi_status_t efi_add_memory_map(u64 start, u64 size, int memory_type)
+{
+	u64 pages;
+
+	pages = efi_size_in_pages(size + (start & EFI_PAGE_MASK));
+	start &= ~EFI_PAGE_MASK;
+
+	return efi_add_memory_map_pg(start, pages, memory_type, false);
+}
+
+/**
  * efi_check_allocated() - validate address to be freed
  *
  * Check that the address is within allocated memory:
@@ -469,7 +492,8 @@ efi_status_t efi_allocate_pages(int type, int memory_type,
 	}
 
 	/* Reserve that map in our memory maps */
-	if (efi_add_memory_map(addr, pages, memory_type, true) != EFI_SUCCESS)
+	ret = efi_add_memory_map_pg(addr, pages, memory_type, true);
+	if (ret != EFI_SUCCESS)
 		/* Map would overlap, bail out */
 		return  EFI_OUT_OF_RESOURCES;
 
@@ -514,7 +538,8 @@ efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
 		return EFI_INVALID_PARAMETER;
 	}
 
-	ret = efi_add_memory_map(memory, pages, EFI_CONVENTIONAL_MEMORY, false);
+	ret = efi_add_memory_map_pg(memory, pages, EFI_CONVENTIONAL_MEMORY,
+				    false);
 	/* Merging of adjacent free regions is missing */
 
 	if (ret != EFI_SUCCESS)
@@ -680,8 +705,8 @@ efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
 
 	pages = (ram_end - ram_start) >> EFI_PAGE_SHIFT;
 
-	efi_add_memory_map(ram_start, pages,
-			   EFI_CONVENTIONAL_MEMORY, false);
+	efi_add_memory_map_pg(ram_start, pages,
+			      EFI_CONVENTIONAL_MEMORY, false);
 
 	/*
 	 * Boards may indicate to the U-Boot memory core that they
@@ -691,14 +716,14 @@ efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
 	 */
 	if (ram_top < ram_start) {
 		/* ram_top is before this region, reserve all */
-		efi_add_memory_map(ram_start, pages,
-				   EFI_BOOT_SERVICES_DATA, true);
+		efi_add_memory_map_pg(ram_start, pages,
+				      EFI_BOOT_SERVICES_DATA, true);
 	} else if ((ram_top >= ram_start) && (ram_top < ram_end)) {
 		/* ram_top is inside this region, reserve parts */
 		pages = (ram_end - ram_top) >> EFI_PAGE_SHIFT;
 
-		efi_add_memory_map(ram_top, pages,
-				   EFI_BOOT_SERVICES_DATA, true);
+		efi_add_memory_map_pg(ram_top, pages,
+				      EFI_BOOT_SERVICES_DATA, true);
 	}
 
 	return EFI_SUCCESS;
@@ -743,7 +768,8 @@ static void add_u_boot_and_runtime(void)
 		       uboot_stack_size) & ~EFI_PAGE_MASK;
 	uboot_pages = ((uintptr_t)map_sysmem(gd->ram_top - 1, 0) -
 		       uboot_start + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
-	efi_add_memory_map(uboot_start, uboot_pages, EFI_LOADER_DATA, false);
+	efi_add_memory_map_pg(uboot_start, uboot_pages, EFI_LOADER_DATA,
+			      false);
 
 #if defined(__aarch64__)
 	/*
@@ -762,8 +788,8 @@ static void add_u_boot_and_runtime(void)
 	runtime_end = (ulong)&__efi_runtime_stop;
 	runtime_end = (runtime_end + runtime_mask) & ~runtime_mask;
 	runtime_pages = (runtime_end - runtime_start) >> EFI_PAGE_SHIFT;
-	efi_add_memory_map(runtime_start, runtime_pages,
-			   EFI_RUNTIME_SERVICES_CODE, false);
+	efi_add_memory_map_pg(runtime_start, runtime_pages,
+			      EFI_RUNTIME_SERVICES_CODE, false);
 }
 
 int efi_memory_init(void)
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 6a25acbbcd..a28b291927 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -784,11 +784,10 @@ out:
 efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
 {
 	struct efi_runtime_mmio_list *newmmio;
-	u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
 	uint64_t addr = *(uintptr_t *)mmio_ptr;
 	efi_status_t ret;
 
-	ret = efi_add_memory_map(addr, pages, EFI_MMAP_IO, false);
+	ret = efi_add_memory_map(addr, len, EFI_MMAP_IO);
 	if (ret != EFI_SUCCESS)
 		return EFI_OUT_OF_RESOURCES;
 
diff --git a/lib/efi_loader/efi_variable_tee.c b/lib/efi_loader/efi_variable_tee.c
new file mode 100644
index 0000000000..cacc76e23d
--- /dev/null
+++ b/lib/efi_loader/efi_variable_tee.c
@@ -0,0 +1,662 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  EFI variable service via OP-TEE
+ *
+ *  Copyright (C) 2019 Linaro Ltd. <sughosh.ganu@linaro.org>
+ *  Copyright (C) 2019 Linaro Ltd. <ilias.apalodimas@linaro.org>
+ */
+
+#include <common.h>
+#include <efi.h>
+#include <efi_api.h>
+#include <efi_loader.h>
+#include <tee.h>
+#include <malloc.h>
+#include <mm_communication.h>
+
+static efi_uintn_t max_buffer_size;	/* comm + var + func + data */
+static efi_uintn_t max_payload_size;	/* func + data */
+
+struct mm_connection {
+	struct udevice *tee;
+	u32 session;
+};
+
+/**
+ * get_connection() - Retrieve OP-TEE session for a specific UUID.
+ *
+ * @conn:   session buffer to fill
+ * Return:  status code
+ */
+static int get_connection(struct mm_connection *conn)
+{
+	static const struct tee_optee_ta_uuid uuid = PTA_STMM_UUID;
+	struct udevice *tee = NULL;
+	struct tee_open_session_arg arg;
+	int rc;
+
+	tee = tee_find_device(tee, NULL, NULL, NULL);
+	if (!tee)
+		return -ENODEV;
+
+	memset(&arg, 0, sizeof(arg));
+	tee_optee_ta_uuid_to_octets(arg.uuid, &uuid);
+	rc = tee_open_session(tee, &arg, 0, NULL);
+	if (!rc) {
+		conn->tee = tee;
+		conn->session = arg.session;
+	}
+
+	return rc;
+}
+
+/**
+ * optee_mm_communicate() - Pass a buffer to StandaloneMM running in OP-TEE
+ *
+ * @comm_buf:		locally allocted communcation buffer
+ * @dsize:		buffer size
+ * Return:		status code
+ */
+static efi_status_t optee_mm_communicate(void *comm_buf, ulong dsize)
+{
+	ulong buf_size;
+	efi_status_t ret;
+	struct efi_mm_communicate_header *mm_hdr;
+	struct mm_connection conn = { NULL, 0 };
+	struct tee_invoke_arg arg;
+	struct tee_param param[2];
+	struct tee_shm *shm = NULL;
+	int rc;
+
+	if (!comm_buf)
+		return EFI_INVALID_PARAMETER;
+
+	mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
+	buf_size = mm_hdr->message_len + sizeof(efi_guid_t) + sizeof(size_t);
+
+	if (dsize != buf_size)
+		return EFI_INVALID_PARAMETER;
+
+	rc = get_connection(&conn);
+	if (rc) {
+		log_err("Unable to open OP-TEE session (err=%d)\n", rc);
+		return EFI_UNSUPPORTED;
+	}
+
+	if (tee_shm_register(conn.tee, comm_buf, buf_size, 0, &shm)) {
+		log_err("Unable to register shared memory\n");
+		return EFI_UNSUPPORTED;
+	}
+
+	memset(&arg, 0, sizeof(arg));
+	arg.func = PTA_STMM_CMDID_COMMUNICATE;
+	arg.session = conn.session;
+
+	memset(param, 0, sizeof(param));
+	param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT;
+	param[0].u.memref.size = buf_size;
+	param[0].u.memref.shm = shm;
+	param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT;
+
+	rc = tee_invoke_func(conn.tee, &arg, 2, param);
+	if (rc)
+		return EFI_INVALID_PARAMETER;
+	tee_shm_free(shm);
+	tee_close_session(conn.tee, conn.session);
+
+	switch (param[1].u.value.a) {
+	case ARM_SMC_MM_RET_SUCCESS:
+		ret = EFI_SUCCESS;
+		break;
+
+	case ARM_SMC_MM_RET_INVALID_PARAMS:
+		ret = EFI_INVALID_PARAMETER;
+		break;
+
+	case ARM_SMC_MM_RET_DENIED:
+		ret = EFI_ACCESS_DENIED;
+		break;
+
+	case ARM_SMC_MM_RET_NO_MEMORY:
+		ret = EFI_OUT_OF_RESOURCES;
+		break;
+
+	default:
+		ret = EFI_ACCESS_DENIED;
+	}
+
+	return ret;
+}
+
+/**
+ * mm_communicate() - Adjust the cmonnucation buffer to StandAlonneMM and send
+ * it to OP-TEE
+ *
+ * @comm_buf:		locally allocted communcation buffer
+ * @dsize:		buffer size
+ * Return:		status code
+ */
+static efi_status_t mm_communicate(u8 *comm_buf, efi_uintn_t dsize)
+{
+	efi_status_t ret;
+	struct efi_mm_communicate_header *mm_hdr;
+	struct smm_variable_communicate_header *var_hdr;
+
+	dsize += MM_COMMUNICATE_HEADER_SIZE + MM_VARIABLE_COMMUNICATE_SIZE;
+	mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
+	var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
+
+	ret = optee_mm_communicate(comm_buf, dsize);
+	if (ret != EFI_SUCCESS) {
+		log_err("%s failed!\n", __func__);
+		return ret;
+	}
+
+	return var_hdr->ret_status;
+}
+
+/**
+ * setup_mm_hdr() -	Allocate a buffer for StandAloneMM and initialize the
+ *			header data.
+ *
+ * @dptr:		pointer address of the corresponding StandAloneMM
+ *			function
+ * @payload_size:	buffer size
+ * @func:		standAloneMM function number
+ * @ret:		EFI return code
+ * Return:		buffer or NULL
+ */
+static u8 *setup_mm_hdr(void **dptr, efi_uintn_t payload_size,
+			efi_uintn_t func, efi_status_t *ret)
+{
+	const efi_guid_t mm_var_guid = EFI_MM_VARIABLE_GUID;
+	struct efi_mm_communicate_header *mm_hdr;
+	struct smm_variable_communicate_header *var_hdr;
+	u8 *comm_buf;
+
+	/* In the init function we initialize max_buffer_size with
+	 * get_max_payload(). So skip the test if max_buffer_size is initialized
+	 * StandAloneMM will perform similar checks and drop the buffer if it's
+	 * too long
+	 */
+	if (max_buffer_size && max_buffer_size <
+			(MM_COMMUNICATE_HEADER_SIZE +
+			 MM_VARIABLE_COMMUNICATE_SIZE +
+			 payload_size)) {
+		*ret = EFI_INVALID_PARAMETER;
+		return NULL;
+	}
+
+	comm_buf = calloc(1, MM_COMMUNICATE_HEADER_SIZE +
+			  MM_VARIABLE_COMMUNICATE_SIZE +
+			  payload_size);
+	if (!comm_buf) {
+		*ret = EFI_OUT_OF_RESOURCES;
+		return NULL;
+	}
+
+	mm_hdr = (struct efi_mm_communicate_header *)comm_buf;
+	guidcpy(&mm_hdr->header_guid, &mm_var_guid);
+	mm_hdr->message_len = MM_VARIABLE_COMMUNICATE_SIZE + payload_size;
+
+	var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data;
+	var_hdr->function = func;
+	if (dptr)
+		*dptr = var_hdr->data;
+	*ret = EFI_SUCCESS;
+
+	return comm_buf;
+}
+
+/**
+ * get_max_payload() - Get variable payload size from StandAloneMM.
+ *
+ * @size:    size of the variable in storage
+ * Return:   status code
+ */
+efi_status_t EFIAPI get_max_payload(efi_uintn_t *size)
+{
+	struct smm_variable_payload_size *var_payload = NULL;
+	efi_uintn_t payload_size;
+	u8 *comm_buf = NULL;
+	efi_status_t ret;
+
+	if (!size) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	payload_size = sizeof(*var_payload);
+	comm_buf = setup_mm_hdr((void **)&var_payload, payload_size,
+				SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE, &ret);
+	if (!comm_buf)
+		goto out;
+
+	ret = mm_communicate(comm_buf, payload_size);
+	if (ret != EFI_SUCCESS)
+		goto out;
+
+	*size = var_payload->size;
+
+out:
+	free(comm_buf);
+	return ret;
+}
+
+/**
+ * efi_get_variable() - retrieve value of a UEFI variable
+ *
+ * This function implements the GetVariable runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @name:		name of the variable
+ * @guid:		vendor GUID
+ * @attr:		attributes of the variable
+ * @data_size:		size of the buffer to which the variable value is copied
+ * @data:		buffer to which the variable value is copied
+ * Return:		status code
+ */
+efi_status_t EFIAPI efi_get_variable(u16 *name, const efi_guid_t *guid,
+				     u32 *attr, efi_uintn_t *data_size,
+				     void *data)
+{
+	struct smm_variable_access *var_acc;
+	efi_uintn_t payload_size;
+	efi_uintn_t name_size;
+	efi_uintn_t tmp_dsize;
+	u8 *comm_buf = NULL;
+	efi_status_t ret;
+
+	EFI_ENTRY("\"%ls\" %pUl %p %p %p", name, guid, attr, data_size, data);
+
+	if (!name || !guid || !data_size) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	/* Check payload size */
+	name_size = u16_strsize(name);
+	if (name_size > max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	/* Trim output buffer size */
+	tmp_dsize = *data_size;
+	if (name_size + tmp_dsize >
+			max_payload_size - MM_VARIABLE_ACCESS_HEADER_SIZE) {
+		tmp_dsize = max_payload_size -
+				MM_VARIABLE_ACCESS_HEADER_SIZE -
+				name_size;
+	}
+
+	/* Get communication buffer and initialize header */
+	payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + tmp_dsize;
+	comm_buf = setup_mm_hdr((void **)&var_acc, payload_size,
+				SMM_VARIABLE_FUNCTION_GET_VARIABLE, &ret);
+	if (!comm_buf)
+		goto out;
+
+	/* Fill in contents */
+	guidcpy(&var_acc->guid, guid);
+	var_acc->data_size = tmp_dsize;
+	var_acc->name_size = name_size;
+	var_acc->attr = attr ? *attr : 0;
+	memcpy(var_acc->name, name, name_size);
+
+	/* Communicate */
+	ret = mm_communicate(comm_buf, payload_size);
+	if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
+		/* Update with reported data size for trimmed case */
+		*data_size = var_acc->data_size;
+	}
+	if (ret != EFI_SUCCESS)
+		goto out;
+
+	if (attr)
+		*attr = var_acc->attr;
+	if (data)
+		memcpy(data, (u8 *)var_acc->name + var_acc->name_size,
+		       var_acc->data_size);
+	else
+		ret = EFI_INVALID_PARAMETER;
+
+out:
+	free(comm_buf);
+	return EFI_EXIT(ret);
+}
+
+/**
+ * efi_get_next_variable_name() - enumerate the current variable names
+ *
+ * @variable_name_size:	size of variable_name buffer in bytes
+ * @variable_name:	name of uefi variable's name in u16
+ * @guid:		vendor's guid
+ *
+ * This function implements the GetNextVariableName service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * Return: status code
+ */
+efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
+					       u16 *variable_name,
+					       efi_guid_t *guid)
+{
+	struct smm_variable_getnext *var_getnext;
+	efi_uintn_t payload_size;
+	efi_uintn_t out_name_size;
+	efi_uintn_t in_name_size;
+	efi_uintn_t tmp_dsize;
+	efi_uintn_t name_size;
+	u8 *comm_buf = NULL;
+	efi_status_t ret;
+
+	EFI_ENTRY("%p \"%ls\" %pUl", variable_name_size, variable_name, guid);
+
+	if (!variable_name_size || !variable_name || !guid) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	out_name_size = *variable_name_size;
+	in_name_size = u16_strsize(variable_name);
+
+	if (out_name_size < in_name_size) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	name_size = u16_strsize(variable_name);
+	if (name_size > max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	/* Trim output buffer size */
+	tmp_dsize = *variable_name_size;
+	if (name_size + tmp_dsize >
+			max_payload_size - MM_VARIABLE_GET_NEXT_HEADER_SIZE) {
+		tmp_dsize = max_payload_size -
+				MM_VARIABLE_GET_NEXT_HEADER_SIZE -
+				name_size;
+	}
+
+	payload_size = MM_VARIABLE_GET_NEXT_HEADER_SIZE + out_name_size;
+	comm_buf = setup_mm_hdr((void **)&var_getnext, payload_size,
+				SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME,
+				&ret);
+	if (!comm_buf)
+		goto out;
+
+	/* Fill in contents */
+	guidcpy(&var_getnext->guid, guid);
+	var_getnext->name_size = out_name_size;
+	memcpy(var_getnext->name, variable_name, in_name_size);
+	memset((u8 *)var_getnext->name + in_name_size, 0x0,
+	       out_name_size - in_name_size);
+
+	/* Communicate */
+	ret = mm_communicate(comm_buf, payload_size);
+	if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
+		/* Update with reported data size for trimmed case */
+		*variable_name_size = var_getnext->name_size;
+	}
+	if (ret != EFI_SUCCESS)
+		goto out;
+
+	guidcpy(guid, &var_getnext->guid);
+	memcpy(variable_name, (u8 *)var_getnext->name,
+	       var_getnext->name_size);
+
+out:
+	free(comm_buf);
+	return EFI_EXIT(ret);
+}
+
+/**
+ * efi_set_variable() - set value of a UEFI variable
+ *
+ * This function implements the SetVariable runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @name:		name of the variable
+ * @guid:		vendor GUID
+ * @attr:		attributes of the variable
+ * @data_size:		size of the buffer with the variable value
+ * @data:		buffer with the variable value
+ * Return:		status code
+ */
+efi_status_t EFIAPI efi_set_variable(u16 *name, const efi_guid_t *guid,
+				     u32 attr, efi_uintn_t data_size,
+				     const void *data)
+{
+	struct smm_variable_access *var_acc;
+	efi_uintn_t payload_size;
+	efi_uintn_t name_size;
+	u8 *comm_buf = NULL;
+	efi_status_t ret;
+
+	EFI_ENTRY("\"%ls\" %pUl %x %zu %p", name, guid, attr, data_size, data);
+
+	if (!name || name[0] == 0 || !guid) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+	if (data_size > 0 && !data) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	/* Check payload size */
+	name_size = u16_strsize(name);
+	payload_size = MM_VARIABLE_ACCESS_HEADER_SIZE + name_size + data_size;
+	if (payload_size > max_payload_size) {
+		ret = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	/* Get communication buffer and initialize header */
+	comm_buf = setup_mm_hdr((void **)&var_acc, payload_size,
+				SMM_VARIABLE_FUNCTION_SET_VARIABLE, &ret);
+	if (!comm_buf)
+		goto out;
+
+	/* Fill in contents */
+	guidcpy(&var_acc->guid, guid);
+	var_acc->data_size = data_size;
+	var_acc->name_size = name_size;
+	var_acc->attr = attr;
+	memcpy(var_acc->name, name, name_size);
+	memcpy((u8 *)var_acc->name + name_size, data, data_size);
+
+	/* Communicate */
+	ret = mm_communicate(comm_buf, payload_size);
+
+out:
+	free(comm_buf);
+	return EFI_EXIT(ret);
+}
+
+/**
+ * efi_query_variable_info() - get information about EFI variables
+ *
+ * This function implements the QueryVariableInfo() runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @attributes:				bitmask to select variables to be
+ *					queried
+ * @maximum_variable_storage_size:	maximum size of storage area for the
+ *					selected variable types
+ * @remaining_variable_storage_size:	remaining size of storage are for the
+ *					selected variable types
+ * @maximum_variable_size:		maximum size of a variable of the
+ *					selected type
+ * Returns:				status code
+ */
+efi_status_t EFIAPI __efi_runtime
+efi_query_variable_info(u32 attributes, u64 *max_variable_storage_size,
+			u64 *remain_variable_storage_size,
+			u64 *max_variable_size)
+{
+	struct smm_variable_query_info *mm_query_info;
+	efi_uintn_t payload_size;
+	efi_status_t ret;
+	u8 *comm_buf;
+
+	EFI_ENTRY("%x %p %p %p", attributes, max_variable_storage_size,
+		  remain_variable_storage_size, max_variable_size);
+
+	payload_size = sizeof(*mm_query_info);
+	comm_buf = setup_mm_hdr((void **)&mm_query_info, payload_size,
+				SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO,
+				&ret);
+	if (!comm_buf)
+		goto out;
+
+	mm_query_info->attr = attributes;
+	ret = mm_communicate(comm_buf, payload_size);
+	if (ret != EFI_SUCCESS)
+		goto out;
+	*max_variable_storage_size = mm_query_info->max_variable_storage;
+	*remain_variable_storage_size =
+			mm_query_info->remaining_variable_storage;
+	*max_variable_size = mm_query_info->max_variable_size;
+
+out:
+	free(comm_buf);
+	return EFI_EXIT(ret);
+}
+
+/**
+ * efi_get_variable_runtime() - runtime implementation of GetVariable()
+ *
+ * @variable_name:	name of the variable
+ * @guid:		vendor GUID
+ * @attributes:		attributes of the variable
+ * @data_size:		size of the buffer to which the variable value is copied
+ * @data:		buffer to which the variable value is copied
+ * Return:		status code
+ */
+static efi_status_t __efi_runtime EFIAPI
+efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid,
+			 u32 *attributes, efi_uintn_t *data_size, void *data)
+{
+	return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_get_next_variable_name_runtime() - runtime implementation of
+ *					  GetNextVariable()
+ *
+ * @variable_name_size:	size of variable_name buffer in byte
+ * @variable_name:	name of uefi variable's name in u16
+ * @guid:		vendor's guid
+ * Return:              status code
+ */
+static efi_status_t __efi_runtime EFIAPI
+efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
+				   u16 *variable_name, efi_guid_t *guid)
+{
+	return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_query_variable_info() - get information about EFI variables
+ *
+ * This function implements the QueryVariableInfo() runtime service.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @attributes:				bitmask to select variables to be
+ *					queried
+ * @maximum_variable_storage_size:	maximum size of storage area for the
+ *					selected variable types
+ * @remaining_variable_storage_size:	remaining size of storage are for the
+ *					selected variable types
+ * @maximum_variable_size:		maximum size of a variable of the
+ *					selected type
+ * Return:				status code
+ */
+efi_status_t EFIAPI __efi_runtime
+efi_query_variable_info_runtime(u32 attributes, u64 *max_variable_storage_size,
+				u64 *remain_variable_storage_size,
+				u64 *max_variable_size)
+{
+	return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_set_variable_runtime() - runtime implementation of SetVariable()
+ *
+ * @variable_name:	name of the variable
+ * @guid:		vendor GUID
+ * @attributes:		attributes of the variable
+ * @data_size:		size of the buffer with the variable value
+ * @data:		buffer with the variable value
+ * Return:		status code
+ */
+static efi_status_t __efi_runtime EFIAPI
+efi_set_variable_runtime(u16 *variable_name, const efi_guid_t *guid,
+			 u32 attributes, efi_uintn_t data_size,
+			 const void *data)
+{
+	return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_variables_boot_exit_notify() - notify ExitBootServices() is called
+ */
+void efi_variables_boot_exit_notify(void)
+{
+	u8 *comm_buf;
+	efi_status_t ret;
+
+	comm_buf = setup_mm_hdr(NULL, 0,
+				SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE, &ret);
+	if (comm_buf)
+		ret = mm_communicate(comm_buf, 0);
+	else
+		ret = EFI_NOT_FOUND;
+
+	if (ret != EFI_SUCCESS)
+		log_err("Unable to notify StMM for ExitBootServices\n");
+	free(comm_buf);
+
+	/* Update runtime service table */
+	efi_runtime_services.query_variable_info =
+			efi_query_variable_info_runtime;
+	efi_runtime_services.get_variable = efi_get_variable_runtime;
+	efi_runtime_services.get_next_variable_name =
+			efi_get_next_variable_name_runtime;
+	efi_runtime_services.set_variable = efi_set_variable_runtime;
+	efi_update_table_header_crc32(&efi_runtime_services.hdr);
+}
+
+/**
+ * efi_init_variables() - initialize variable services
+ *
+ * Return:	status code
+ */
+efi_status_t efi_init_variables(void)
+{
+	efi_status_t ret;
+
+	ret = get_max_payload(&max_payload_size);
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+	max_buffer_size = MM_COMMUNICATE_HEADER_SIZE +
+			  MM_VARIABLE_COMMUNICATE_SIZE +
+			  max_payload_size;
+
+	return EFI_SUCCESS;
+}