Date:   Sat, 22 Feb 2020 14:28:27 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     linux-efi <linux-efi@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] EFI updates for v5.7

On Fri, 21 Feb 2020 at 09:56, Ard Biesheuvel <ardb@...nel.org> wrote:
>
> Hello Ingo, Thomas,
>
> I am sending this as an ordinary PR this time, given the size. Please let
> me know if instead, you prefer me to send it out piecemeal as usual. Either
> works for me, I was just reluctant to spam people unsolicited.
>

Arvind has spotted a couple of minor issues in the PE/COFF header
generation changes, so please disregard this PR for now.

However, could you please let me know how you prefer to handle a PR of
this size?

Thanks,
Ard.



> Note that EFI for RISC-V may still arrive this cycle as well.
>
> Please take special note of the GDT changes by Arvind. They were posted to
> the list without any feedback, and they look fine to me, but I know very
> little about these x86 CPU low level details.
>
> This was all build and boot tested on various different kinds of hardware,
> and all minor issues were fixed along the way.
>
>
> The following changes since commit bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9:
>
>   Linux 5.6-rc1 (2020-02-09 16:08:48 -0800)
>
> are available in the Git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git efi-next
>
> for you to fetch changes up to c0cd4ad8a865f910e646f37b16566a2f408e63a4:
>
>   efi: Bump the Linux EFI stub major version number to #1 (2020-02-21 09:04:34 +0100)
>
> ----------------------------------------------------------------
> This time, the set of changes for the EFI subsystem is much larger than
> usual. The main reasons are:
> - Get things cleaned up before EFI support for RISC-V arrives, which will
>   increase the size of the validation matrix, and therefore the threshold to
>   making drastic changes,
> - After years of defunct maintainership, the GRUB project has finally started
>   to consider changes from the distros regarding UEFI boot, some of which are
>   highly specific to the way x86 does UEFI secure boot and measured boot,
>   based on knowledge of both shim internals and the layout of bootparams and
>   the x86 setup header. Having this maintenance burden on other architectures
>   (which don't need shim in the first place) is hard to justify, so instead,
>   we are introducing a generic Linux/UEFI boot protocol.
>
> Summary of changes:
> - Boot time GDT handling changes (Arvind)
> - Simplify handling of EFI properties table on arm64
> - Generic EFI stub cleanups, to improve command line handling, file I/O,
>   memory allocation, etc.
> - Introduce a generic initrd loading method based on calling back into
>   the firmware, instead of relying on the x86 EFI handover protocol or
>   device tree.
> - Introduce a mixed mode boot method that does not rely on the x86 EFI
>   handover protocol either, and could potentially be adopted by other
>   architectures (if another one ever surfaces where one execution mode
>   is a superset of another)
> - Clean up the contents of struct efi, and move out everything that
>   doesn't need to be stored there.
> - Incorporate support for UEFI spec v2.8A changes that permit firmware
>   implementations to return EFI_UNSUPPORTED from UEFI runtime services at
>   OS runtime, and expose a mask of which ones are supported or unsupported
>   via a configuration table.
> - Add kerneldoc for the memory allocation routines in the stub (Heinrich)
> - Partial fix for the lack of by-VA cache maintenance in the decompressor
>   on 32-bit ARM. Note that these patches were deliberately put at the
>   beginning so they can be used as a stable branch that will be shared with
>   a PR containing the complete fix, which I will send to the ARM tree.
>
> ----------------------------------------------------------------
> Ard Biesheuvel (66):
>       efi/arm: Work around missing cache maintenance in decompressor handover
>       efi/arm: Pass start and end addresses to cache_clean_flush()
>       efi/libstub/arm: Make efi_entry() an ordinary PE/COFF entrypoint
>       efi/libstub/arm64: Use 1:1 mapping of RT services if property table exists
>       efi/libstub/x86: Remove pointless zeroing of apm_bios_info
>       efi/libstub/x86: Avoid overflowing code32_start on PE entry
>       efi/libstub: Use hidden visibility for all source files
>       efi/libstub/arm: Relax FDT alignment requirement
>       efi/libstub: Move memory map handling and allocation routines to mem.c
>       efi/libstub: Simplify efi_high_alloc() and rename to efi_allocate_pages()
>       efi/libstub/x86: Incorporate eboot.c into libstub
>       efi/libstub: Use consistent type names for file I/O protocols
>       efi/libstub/x86: Permit bootparams struct to be allocated above 4 GB
>       efi/libstub: Move stub specific declarations into efistub.h
>       efi/libstub/x86: Permit cmdline data to be allocated above 4 GB
>       efi/libstub: Move efi_random_alloc() into separate source file
>       efi/libstub: Move get_dram_base() into arm-stub.c
>       efi/libstub: Move file I/O support code into separate file
>       efi/libstub: Rewrite file I/O routine
>       efi/libstub: Take soft and hard memory limits into account for initrd loading
>       efi/libstub: Clean up command line parsing routine
>       efi/libstub: Expose LocateDevicePath boot service
>       efi/libstub: Make the LoadFile EFI protocol accessible
>       efi/x86: Reindent struct initializer for legibility
>       efi/x86: Replace #ifdefs with IS_ENABLED() checks
>       efi/dev-path-parser: Add struct definition for vendor type device path nodes
>       efi/libstub: Add support for loading the initrd from a device path
>       efi/libstub: Take noinitrd cmdline argument into account for devpath initrd
>       efi: Drop handling of 'boot_info' configuration table
>       efi/ia64: Move HCDP and MPS table handling into IA64 arch code
>       efi: Move UGA and PROP table handling to x86 code
>       efi: Make rng_seed table handling local to efi.c
>       efi: Move mem_attr_table out of struct efi
>       efi: Make memreserve table handling local to efi.c
>       efi: Merge EFI system table revision and vendor checks
>       efi/ia64: Use existing helpers to locate ESI table
>       efi/ia64: Use local variable for EFI system table address
>       efi/ia64: Switch to efi_config_parse_tables()
>       efi: Make efi_config_init() x86 only
>       efi: Clean up config_parse_tables()
>       efi/x86: Remove runtime table address from kexec EFI setup data
>       efi/x86: Make fw_vendor, config_table and runtime sysfs nodes x86 specific
>       efi/x86: Merge assignments of efi.runtime_version
>       efi: Add 'runtime' pointer to struct efi
>       efi/arm: Drop unnecessary references to efi.systab
>       efi/x86: Drop 'systab' member from struct efi
>       efi/x86: Drop redundant .bss section
>       efi/libstub/x86: Make loaded_image protocol handling mixed mode safe
>       efi/libstub/x86: Use Exit() boot service to exit the stub on errors
>       efi/x86: Implement mixed mode boot without the handover protocol
>       efi/x86: Add true mixed mode entry point into .compat section
>       efi/arm: Move FDT param discovery code out of efi.c
>       efi/arm: Move FDT specific definitions into fdtparams.c
>       efi/arm: Rewrite FDT param discovery routines
>       efi: Store mask of supported runtime services in struct efi
>       efi: Add support for EFI_RT_PROPERTIES table
>       efi: Use more granular check for availability for variable services
>       efi: Register EFI rtc platform device only when available
>       infiniband: hfi1: Use EFI GetVariable only when available
>       scsi: iscsi: Use EFI GetVariable only when available
>       efi: Use EFI ResetSystem only when available
>       x86/ima: Use EFI GetVariable only when available
>       integrity: Check properly whether EFI GetVariable() is available
>       efi/x86: Use symbolic constants in PE header instead of bare numbers
>       efi/libstub: Introduce symbolic constants for the stub major/minor version
>       efi: Bump the Linux EFI stub major version number to #1
>
> Arvind Sankar (8):
>       x86/boot: Remove KEEP_SEGMENTS support
>       efi/x86: Don't depend on firmware GDT layout
>       x86/boot: Reload GDTR after copying to the end of the buffer
>       x86/boot: Clear direction and interrupt flags in startup_64
>       efi/x86: Remove GDT setup from efi_main
>       x86/boot: GDT limit value should be size - 1
>       x86/boot: Micro-optimize GDT loading instructions
>       efi/x86: Mark setup_graphics static
>
> Gustavo A. R. Silva (1):
>       efi/apple-properties: Replace zero-length array with flexible-array member
>
> Hans de Goede (1):
>       efi/bgrt: Accept BGRT tables with a version of 0
>
> Heinrich Schuchardt (4):
>       efi/libstub: Add function description of efi_allocate_pages()
>       efi/libstub: Simplify efi_get_memory_map()
>       efi/libstub: Describe memory functions
>       efi/libstub: Describe efi_relocate_kernel()
>
>  Documentation/x86/boot.rst                         |   8 +-
>  arch/arm/boot/compressed/efi-header.S              |   6 +-
>  arch/arm/boot/compressed/head.S                    |  64 +-
>  arch/arm64/include/asm/efi.h                       |  10 -
>  arch/arm64/kernel/efi-entry.S                      |  64 +-
>  arch/arm64/kernel/efi-header.S                     |   6 +-
>  arch/arm64/kernel/image-vars.h                     |   1 +
>  arch/ia64/kernel/efi.c                             |  55 +-
>  arch/ia64/kernel/esi.c                             |  21 +-
>  arch/x86/boot/Makefile                             |   2 +-
>  arch/x86/boot/compressed/Makefile                  |   5 +-
>  arch/x86/boot/compressed/eboot.h                   |  31 -
>  arch/x86/boot/compressed/efi_thunk_64.S            |  29 +-
>  arch/x86/boot/compressed/head_32.S                 |  48 +-
>  arch/x86/boot/compressed/head_64.S                 | 125 +++-
>  arch/x86/boot/header.S                             |  87 +--
>  arch/x86/boot/tools/build.c                        |  69 +-
>  arch/x86/include/asm/efi.h                         |  23 +-
>  arch/x86/kernel/asm-offsets_32.c                   |   5 +
>  arch/x86/kernel/head_32.S                          |   6 -
>  arch/x86/kernel/ima_arch.c                         |   2 +-
>  arch/x86/kernel/kexec-bzimage64.c                  |   5 +-
>  arch/x86/platform/efi/efi.c                        | 283 ++++---
>  arch/x86/platform/efi/efi_32.c                     |  13 +-
>  arch/x86/platform/efi/efi_64.c                     |  14 +-
>  arch/x86/platform/efi/efi_stub_32.S                |  21 +-
>  arch/x86/platform/efi/quirks.c                     |   2 +-
>  drivers/firmware/efi/Makefile                      |   1 +
>  drivers/firmware/efi/apple-properties.c            |  12 +-
>  drivers/firmware/efi/arm-init.c                    |  83 +--
>  drivers/firmware/efi/arm-runtime.c                 |  18 -
>  drivers/firmware/efi/dev-path-parser.c             |  38 +-
>  drivers/firmware/efi/efi-bgrt.c                    |   7 +-
>  drivers/firmware/efi/efi-pstore.c                  |   2 +-
>  drivers/firmware/efi/efi.c                         | 418 ++++-------
>  drivers/firmware/efi/efivars.c                     |   2 +-
>  drivers/firmware/efi/fdtparams.c                   | 126 ++++
>  drivers/firmware/efi/libstub/Makefile              |   7 +-
>  drivers/firmware/efi/libstub/arm-stub.c            | 193 ++---
>  drivers/firmware/efi/libstub/arm32-stub.c          |   1 +
>  drivers/firmware/efi/libstub/arm64-stub.c          |  11 +-
>  drivers/firmware/efi/libstub/efi-stub-helper.c     | 822 ++++-----------------
>  drivers/firmware/efi/libstub/efistub.h             | 611 ++++++++++++++-
>  drivers/firmware/efi/libstub/fdt.c                 |   7 +-
>  drivers/firmware/efi/libstub/file.c                | 258 +++++++
>  drivers/firmware/efi/libstub/hidden.h              |   6 +
>  drivers/firmware/efi/libstub/mem.c                 | 309 ++++++++
>  drivers/firmware/efi/libstub/random.c              | 114 ---
>  drivers/firmware/efi/libstub/randomalloc.c         | 124 ++++
>  drivers/firmware/efi/libstub/string.c              |  63 ++
>  .../firmware/efi/libstub/x86-stub.c                | 258 +++----
>  drivers/firmware/efi/memattr.c                     |  13 +-
>  drivers/firmware/efi/reboot.c                      |   4 +-
>  drivers/firmware/efi/runtime-wrappers.c            |   4 +-
>  drivers/firmware/pcdp.c                            |   8 +-
>  drivers/infiniband/hw/hfi1/efivar.c                |   2 +-
>  drivers/rtc/Makefile                               |   4 -
>  drivers/rtc/rtc-efi-platform.c                     |  35 -
>  drivers/scsi/isci/init.c                           |   2 +-
>  fs/efivarfs/super.c                                |   2 +-
>  include/linux/efi.h                                | 691 +++--------------
>  include/linux/pe.h                                 |  21 +
>  security/integrity/platform_certs/load_uefi.c      |   2 +-
>  63 files changed, 2667 insertions(+), 2617 deletions(-)
>  delete mode 100644 arch/x86/boot/compressed/eboot.h
>  create mode 100644 drivers/firmware/efi/fdtparams.c
>  create mode 100644 drivers/firmware/efi/libstub/file.c
>  create mode 100644 drivers/firmware/efi/libstub/hidden.h
>  create mode 100644 drivers/firmware/efi/libstub/mem.c
>  create mode 100644 drivers/firmware/efi/libstub/randomalloc.c
>  rename arch/x86/boot/compressed/eboot.c => drivers/firmware/efi/libstub/x86-stub.c (82%)
>  delete mode 100644 drivers/rtc/rtc-efi-platform.c

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