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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/firmware/efi/Kconfig
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@@ -1,22 +1,18 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 menu "EFI (Extensible Firmware Interface) Support"
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 	depends on EFI
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 config EFI_VARS
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 	tristate "EFI Variable Support via sysfs"
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-	depends on EFI
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+	depends on EFI && (X86 || IA64)
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 	default n
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 	help
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 	  If you say Y here, you are able to get EFI (Extensible Firmware
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 	  Interface) variable information via sysfs.  You may read,
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 	  write, create, and destroy EFI variables through this interface.
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-
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-	  Note that using this driver in concert with efibootmgr requires
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-	  at least test release version 0.5.0-test3 or later, which is
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-	  available from:
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-	  <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
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-
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-	  Subsequent efibootmgr releases may be found at:
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-	  <http://github.com/vathpela/efibootmgr>
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+	  Note that this driver is only retained for compatibility with
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+	  legacy users: new users should use the efivarfs filesystem
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+	  instead.
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 config EFI_ESRT
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 	bool
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@@ -25,7 +21,7 @@
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 config EFI_VARS_PSTORE
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 	tristate "Register efivars backend for pstore"
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-	depends on EFI_VARS && PSTORE
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+	depends on PSTORE
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 	default y
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 	help
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 	  Say Y here to enable use efivars as a backend to pstore. This
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@@ -74,6 +70,27 @@
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 	  Ranges can be set up to this value using comma-separated list.
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 	  The default value is 8.
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+config EFI_SOFT_RESERVE
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+	bool "Reserve EFI Specific Purpose Memory"
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+	depends on EFI && EFI_STUB && ACPI_HMAT
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+	default ACPI_HMAT
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+	help
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+	  On systems that have mixed performance classes of memory EFI
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+	  may indicate specific purpose memory with an attribute (See
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+	  EFI_MEMORY_SP in UEFI 2.8). A memory range tagged with this
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+	  attribute may have unique performance characteristics compared
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+	  to the system's general purpose "System RAM" pool. On the
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+	  expectation that such memory has application specific usage,
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+	  and its base EFI memory type is "conventional" answer Y to
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+	  arrange for the kernel to reserve it as a "Soft Reserved"
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+	  resource, and set aside for direct-access (device-dax) by
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+	  default. The memory range can later be optionally assigned to
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+	  the page allocator by system administrator policy via the
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+	  device-dax kmem facility. Say N to have the kernel treat this
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+	  memory as "System RAM" by default.
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+
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+	  If unsure, say Y.
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+
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 config EFI_PARAMS_FROM_FDT
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 	bool
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 	help
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@@ -84,12 +101,12 @@
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 config EFI_RUNTIME_WRAPPERS
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 	bool
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-config EFI_ARMSTUB
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+config EFI_GENERIC_STUB
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 	bool
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 config EFI_ARMSTUB_DTB_LOADER
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 	bool "Enable the DTB loader"
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-	depends on EFI_ARMSTUB
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+	depends on EFI_GENERIC_STUB && !RISCV
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 	default y
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 	help
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 	  Select this config option to add support for the dtb= command
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@@ -102,11 +119,22 @@
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 	  functionality for bootloaders that do not have such support
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 	  this option is necessary.
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+config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER
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+	bool "Enable the command line initrd loader" if !X86
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+	depends on EFI_STUB && (EFI_GENERIC_STUB || X86)
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+	default y
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+	depends on !RISCV
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+	help
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+	  Select this config option to add support for the initrd= command
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+	  line parameter, allowing an initrd that resides on the same volume
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+	  as the kernel image to be loaded into memory.
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+
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+	  This method is deprecated.
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+
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 config EFI_BOOTLOADER_CONTROL
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 	tristate "EFI Bootloader Control"
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-	depends on EFI_VARS
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 	default n
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-	---help---
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+	help
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 	  This module installs a reboot hook, such that if reboot() is
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 	  invoked with a string argument NNN, "NNN" is copied to the
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 	  "LoaderEntryOneShot" EFI variable, to be read by the
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@@ -179,18 +207,48 @@
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 	  have been evicted, since otherwise it will trigger even on clean
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 	  reboots.
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-config EFI_CUSTOM_SSDT_OVERLAYS
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-	bool "Load custom ACPI SSDT overlay from an EFI variable"
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-	depends on EFI_VARS && ACPI
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-	default ACPI_TABLE_UPGRADE
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+config EFI_RCI2_TABLE
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+	bool "EFI Runtime Configuration Interface Table Version 2 Support"
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+	depends on X86 || COMPILE_TEST
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 	help
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-	  Allow loading of an ACPI SSDT overlay from an EFI variable specified
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-	  by a kernel command line option.
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+	  Displays the content of the Runtime Configuration Interface
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+	  Table version 2 on Dell EMC PowerEdge systems as a binary
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+	  attribute 'rci2' under /sys/firmware/efi/tables directory.
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-	  See Documentation/admin-guide/acpi/ssdt-overlays.rst for more
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-	  information.
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+	  RCI2 table contains BIOS HII in XML format and is used to populate
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+	  BIOS setup page in Dell EMC OpenManage Server Administrator tool.
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+	  The BIOS setup page contains BIOS tokens which can be configured.
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+
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+	  Say Y here for Dell EMC PowerEdge systems.
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+
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+config EFI_DISABLE_PCI_DMA
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+       bool "Clear Busmaster bit on PCI bridges during ExitBootServices()"
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+       help
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+	  Disable the busmaster bit in the control register on all PCI bridges
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+	  while calling ExitBootServices() and passing control to the runtime
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+	  kernel. System firmware may configure the IOMMU to prevent malicious
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+	  PCI devices from being able to attack the OS via DMA. However, since
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+	  firmware can't guarantee that the OS is IOMMU-aware, it will tear
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+	  down IOMMU configuration when ExitBootServices() is called. This
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+	  leaves a window between where a hostile device could still cause
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+	  damage before Linux configures the IOMMU again.
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+
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+	  If you say Y here, the EFI stub will clear the busmaster bit on all
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+	  PCI bridges before ExitBootServices() is called. This will prevent
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+	  any malicious PCI devices from being able to perform DMA until the
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+	  kernel reenables busmastering after configuring the IOMMU.
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+
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+	  This option will cause failures with some poorly behaved hardware
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+	  and should not be enabled without testing. The kernel commandline
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+	  options "efi=disable_early_pci_dma" or "efi=no_disable_early_pci_dma"
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+	  may be used to override this option.
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 endmenu
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+
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+config EFI_EMBEDDED_FIRMWARE
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+	bool
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+	depends on EFI
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+	select CRYPTO_LIB_SHA256
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 config UEFI_CPER
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 	bool
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 	bool
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 	depends on ACPI
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 	default n
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+
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+config EFI_EARLYCON
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+	def_bool y
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+	depends on EFI && SERIAL_EARLYCON && !ARM && !IA64
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+	select FONT_SUPPORT
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+	select ARCH_USE_MEMREMAP_PROT
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+
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+config EFI_CUSTOM_SSDT_OVERLAYS
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+	bool "Load custom ACPI SSDT overlay from an EFI variable"
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+	depends on EFI && ACPI
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+	default ACPI_TABLE_UPGRADE
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+	help
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+	  Allow loading of an ACPI SSDT overlay from an EFI variable specified
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+	  by a kernel command line option.
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+
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+	  See Documentation/admin-guide/acpi/ssdt-overlays.rst for more
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+	  information.