kernel/linux.git/drivers/firmware/efi/libstub, branch linux-7.1.y

efi/loongarch: Randomize kernel preferred address for KASLR

2026-05-21T12:58:36+00:00

Introduce efi_get_kimg_kaslr_address() helper to compute the preferred kernel image load address dynamically when CONFIG_RANDOMIZE_BASE is enabled. The function derives a random offset by using the EFI-provided randomness combined with the timer tick value, and constrains it within CONFIG_RANDOMIZE_BASE_MAX_OFFSET. Update EFI_KIMG_PREFERRED_ADDRESS to call this helper so that the EFI stub can select a randomized load address when KASLR is active, while preserving the original base address behavior when KASLR is disabled or "nokaslr" is specified. Note: LoongArch can't KASLR for hibernation, so set efi_nokaslr to true if "resume=" is explicitly specified in cmdline. Acked-by: Ard Biesheuvel Signed-off-by: WANG Rui Signed-off-by: Huacai Chen

efi/libstub: Synchronize instruction cache after kernel relocation

2026-04-29T06:56:16+00:00

The relocated kernel image is copied to its new location using memcpy(). On architectures with separate instruction and data caches, the copied instructions may remain stale in the instruction cache, leading to the execution of outdated contents. Call efi_cache_sync_image() after the relocation copy to ensure the instruction cache is synchronized with the updated memory contents before control is transferred to the relocated kernel. Signed-off-by: WANG Rui Reviewed-by: Huacai Chen Signed-off-by: Ard Biesheuvel

efi/loongarch: Implement efi_cache_sync_image()

2026-04-29T06:56:16+00:00

Provide a LoongArch implementation of efi_cache_sync_image() to ensure instruction cache coherency after the kernel image is relocated. Signed-off-by: WANG Rui Reviewed-by: Huacai Chen Signed-off-by: Ard Biesheuvel

efi/libstub: Move efi_relocate_kernel() into its only remaining user

2026-04-29T06:55:58+00:00

LoongArch is the only arch that still uses efi_relocate_kernel(), so before making changes to it that LoongArch needs, turn it into a private function. Move efi_low_alloc_above() into mem.c while at it, and drop the relocate.c source file altogether. Tested-by: WANG Rui Reviewed-by: Thomas Huth Signed-off-by: Ard Biesheuvel

Merge tag 'loongarch-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

2026-04-24T16:54:45+00:00

Pull LoongArch updates from Huacai Chen: - Adjust build infrastructure for 32BIT/64BIT - Add HIGHMEM (PKMAP and FIX_KMAP) support - Show and handle CPU vulnerabilites correctly - Batch the icache maintenance for jump_label - Add more atomic instructions support for BPF JIT - Add more features (e.g. fsession) support for BPF trampoline - Some bug fixes and other small changes * tag 'loongarch-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: (21 commits) selftests/bpf: Enable CAN_USE_LOAD_ACQ_STORE_REL for LoongArch LoongArch: BPF: Add fsession support for trampolines LoongArch: BPF: Introduce emit_store_stack_imm64() helper LoongArch: BPF: Support up to 12 function arguments for trampoline LoongArch: BPF: Support small struct arguments for trampoline LoongArch: BPF: Open code and remove invoke_bpf_mod_ret() LoongArch: BPF: Support load-acquire and store-release instructions LoongArch: BPF: Support 8 and 16 bit read-modify-write instructions LoongArch: BPF: Add the default case in emit_atomic() and rename it LoongArch: Define instruction formats for AM{SWAP/ADD}.{B/H} and DBAR LoongArch: Batch the icache maintenance for jump_label LoongArch: Add flush_icache_all()/local_flush_icache_all() LoongArch: Add spectre boundry for syscall dispatch table LoongArch: Show CPU vulnerabilites correctly LoongArch: Make arch_irq_work_has_interrupt() true only if IPI HW exist LoongArch: Use get_random_canary() for stack canary init LoongArch: Improve the logging of disabling KASLR LoongArch: Align FPU register state to 32 bytes LoongArch: Handle CONFIG_32BIT in syscall_get_arch() LoongArch: Add HIGHMEM (PKMAP and FIX_KMAP) support ...

LoongArch: Adjust build infrastructure for 32BIT/64BIT

2026-04-22T07:44:26+00:00

Adjust build infrastructure (Kconfig, Makefile and ld scripts) to let us enable both 32BIT/64BIT kernel build. Reviewed-by: Arnd Bergmann Signed-off-by: Jiaxun Yang Signed-off-by: Huacai Chen

Merge tag 'efi-next-for-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

2026-04-16T15:06:25+00:00

Pull EFI updates from Ard Biesheuvel: "Again not a busy cycle for EFI, just some minor tweaks and bug fixes: - Enable boot graphics resource table (BGRT) on Xen/x86 - Correct a misguided assumption in the memory attributes table sanity check - Start tagging efi_mem_reserve()'d regions as MEMBLOCK_RSRV_KERN - Some other minor fixes and cleanups" * tag 'efi-next-for-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: efi/capsule-loader: fix incorrect sizeof in phys array reallocation efi: Tag memblock reservations of boot services regions as RSRV_KERN memblock: Permit existing reserved regions to be marked RSRV_KERN efi/memattr: Fix thinko in table size sanity check efi: libstub: fix type of fdt 32 and 64bit variables efi: Drop unused efi_range_is_wc() function efi: Enable BGRT loading under Xen efi: make efi_mem_type() and efi_mem_attributes() work on Xen PV

kbuild: Consolidate C dialect options

2026-03-12T11:52:37+00:00

Introduce CC_FLAGS_DIALECT to make it easier to update the various places in the tree that rely on the GNU C standard and Microsoft extensions flags atomically. All remaining uses of '-std=gnu11' and '-fms-extensions' are in the tools directory (which has its own build system) and other standalone Makefiles. This will allow the kernel to use a narrower option to enable the Microsoft anonymous tagged structure extension in a simpler manner. Place the CC_FLAGS_DIALECT block after the configuration include (so that a future change can move the selection of the flag to Kconfig) but before the arch/$(SRCARCH)/Makefile include (so that CC_FLAGS_DIALECT is available for use in those Makefiles). Signed-off-by: Nathan Chancellor Reviewed-by: Nicolas Schier Acked-by: Ard Biesheuvel Acked-by: Helge Deller # parisc Link: https://patch.msgid.link/20260223-fms-anonymous-structs-v1-1-8ee406d3c36c@kernel.org Signed-off-by: Nicolas Schier

efi: libstub: fix type of fdt 32 and 64bit variables

2026-03-11T18:52:45+00:00

In update_fdt_memmap() an update_fdt() the fdt values should be of the fd32_t and fdt64_t types. Make the relevant changes to remove the following sparse warnings: drivers/firmware/efi/libstub/fdt.c:97:19: warning: incorrect type in assignment (different base types) drivers/firmware/efi/libstub/fdt.c:97:19: expected unsigned long long [usertype] fdt_val64 drivers/firmware/efi/libstub/fdt.c:97:19: got restricted __be64 [usertype] drivers/firmware/efi/libstub/fdt.c:157:19: warning: incorrect type in assignment (different base types) drivers/firmware/efi/libstub/fdt.c:157:19: expected unsigned long long [usertype] fdt_val64 drivers/firmware/efi/libstub/fdt.c:157:19: got restricted __be64 [usertype] drivers/firmware/efi/libstub/fdt.c:163:19: warning: incorrect type in assignment (different base types) drivers/firmware/efi/libstub/fdt.c:163:19: expected unsigned int [usertype] fdt_val32 drivers/firmware/efi/libstub/fdt.c:163:19: got restricted __be32 [usertype] drivers/firmware/efi/libstub/fdt.c:169:19: warning: incorrect type in assignment (different base types) drivers/firmware/efi/libstub/fdt.c:169:19: expected unsigned int [addressable] [usertype] fdt_val32 drivers/firmware/efi/libstub/fdt.c:169:19: got restricted __be32 [usertype] drivers/firmware/efi/libstub/fdt.c:175:19: warning: incorrect type in assignment (different base types) drivers/firmware/efi/libstub/fdt.c:175:19: expected unsigned int [addressable] [usertype] fdt_val32 drivers/firmware/efi/libstub/fdt.c:175:19: got restricted __be32 [usertype] Signed-off-by: Ben Dooks Signed-off-by: Ard Biesheuvel

Merge tag 'efi-next-for-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

2026-02-10T04:49:19+00:00

Pull EFI updates from Ard Biesheuvel: - Quirk the broken EFI framebuffer geometry on the Valve Steam Deck - Capture the EDID information of the primary display also on non-x86 EFI systems when booting via the EFI stub. * tag 'efi-next-for-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: efi: Support EDID information sysfb: Move edid_info into sysfb_primary_display sysfb: Pass sysfb_primary_display to devices sysfb: Replace screen_info with sysfb_primary_display sysfb: Add struct sysfb_display_info efi: sysfb_efi: Reduce number of references to global screen_info efi: earlycon: Reduce number of references to global screen_info efi: sysfb_efi: Fix efidrmfb and simpledrmfb on Valve Steam Deck efi: sysfb_efi: Convert swap width and height quirk to a callback efi: sysfb_efi: Fix lfb_linelength calculation when applying quirks efi: sysfb_efi: Replace open coded swap with the macro