Merge tag 'efi-next-for-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI updates from Ard Biesheuvel:

 - Set the LoaderDevicePartUUID EFI variable from the stub to help
   systemd discover the file system layout when booting straight into
   Linux without GRUB or systemd-boot (Vincent Mailhol)

 - Some GUID deduplication work from Vincent

 - Remove pointless UTF16->UTF8 and vice versa conversions from the stub

 - Some kmap() -> kmap_local_page() conversions in the capsule loader

 - Add a runtime control to en/disable EFI runtime services so that
   PREEMPT_RT systems can enable them as needed

 - Add a 'nostatfs' mount option to efivarfs so that the cost of
   querying the EFI variable store (which is already rate limited) can
   be avoided entirely on systems where it is disproportionately costly

 - Rework the EFI libstub Makefile to align x86 with other
   architectures, and inherit/adapt the global CFLAGS variable rather
   than reconstruct it from scratch

 - Constify attributes of statically allocated sysfs nodes

 - Avoid register x18 when building the arm64 EFI stub, in order to
   comply with the UEFI spec, and to permit it to execute in a context
   where x18 is special

 - Preserve the physical addresses of all EFI config tables that may be
   of interest to an incoming kexec kernel

 - Add some LKDTM tests for EFI runtime crashes where the faulting
   address is inside a EFI memory region

 - Other minor bug fixes and cosmetic cleanups

* tag 'efi-next-for-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: (35 commits)
  lkdtm: Add more EFI runtime tests
  efi: Initialize all configuration table addresses to EFI_INVALID_TABLE_ADDR
  efi: Retain the address of the LINUX_EFI_MEMRESERVE table
  efi/libstub: Don't replace an existing LINUX_EFI_MEMRESERVE table
  efi/runtime-wrappers: Don't park the worker after a recovered firmware fault
  efi: Use sysfs_emit() not sprintf() to generate sysfs file contents
  efi: Constify sysfs attributes
  efi/libstub: Disable kernel stack erasing in the common flags
  efi/libstub: Build the x86 stub from KBUILD_CFLAGS
  efi/libstub: Declare the x86 stub's assembly entry points
  efi/libstub: arm64: Don't use the platform register x18
  efi/libstub: Free cmdline_ptr in efi_pe_entry
  efi/riscv: libstub: Don't set image_size in handle_kernel_image()
  efi/libstub: Fix error unwind freeing fdt in allocate_new_fdt_and_exit_boot()
  efivarfs: add nostatfs mount option to skip QueryVariableInfo()
  efi/libstub: add initial Boot Loader Interface support
  efi/libstub: Add efi_snprintf() to construct wide strings
  efi/libstub: Add support for printing human readable GUIDs
  efi/libstub: Output UTF-16 directly from vsnprintf()
  efi/libstub: Avoid efi_puts() for compile time constant strings
  ...

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