wireguard-linux/arch/x86/boot/compressed, branch stable

Merge tag 'liveupdate-v7.3-rc1-20260823' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux

2026-08-23T16:17:38Z

Pull more liveupdate updates from Mike Rapoport: "Make boot time huge page allocation work nicely with kexec handover. Today allocation of gigantic pages in HugeTLB cannot work reliably with kexec handover (KHO): - HugeTLB allocates gigantic pages using memblock and autoscaling of KHO scratch accounts for these allocations. When gigantic pages occupy half of the memory of more, KHO fails to allocate its scratch memory. - After kexec handover, memblock allocations exclusively use KHO scratch that is not supposed to contain preserved memory. This essentially blocks preservation of HugeTLB with gigantic pages. Extend early memory pools available for KHO kernel with areas that are guaranteed not to contain preserved memory" * tag 'liveupdate-v7.3-rc1-20260823' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux: (21 commits) kho: exclude hugetlb memory from scratch size calculation memblock: add memblock_reserved_hugetlb_size() memblock: make HugeTLB bootmem allocation work with KHO memblock: always include KHO headers kho: extend scratch mm/mm_init: don't rely on memblock to get KHO scratch migratetype kho: initialize preserved memory map radix tree earlier kho: initialize kho_scratch pointer earlier in boot kho: expose kho_scratch_overlap() to kexec_handover.h kho: add kho_radix_init_tree() kho: allow destroying KHO radix tree kho: allow early-boot usage of the KHO radix tree kho: add data argument to radix walk callback kho: add callback for table pages kho: add a struct for radix callbacks kho: move all memory retrieval logic to kho_mem_retrieve() kho: store incoming radix tree in kho_in kho: disallow wide keys in radix tree kho: make radix max key width more obvious kho: generalize radix tree APIs ...

Merge tag 'x86_cleanups_for_v7.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-08-19T01:34:58Z

Pull x86 cleanups from Borislav Petkov: - The usual pile of smallish cleanups and fixlets all over the place * tag 'x86_cleanups_for_v7.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/cpu: Remove unnecessary __maybe_unused annotations x86/msr: Document the I/O-like write semantics in the msr driver x86/apic: Ensure ICR register write value is handled as 32 bits x86/boot/compressed/head_64.S: Clean up SEV-related comments Documentation/arch/x86/amd-memory-encryption.rst: Fix typo x86/platform/quark: Fix kernel-doc warnings in imr.c x86/ras: Move contents from arch/x86/ras/Kconfig into drivers/ras/Kconfig x86/cpu: Move intel_get_platform_id() to cpu/intel.c x86/mm: Fix typo in comment x86/fpu: Fix kernel-doc formatting above fpu_enable_guest_xfd_features() x86/cfi: Use symmetric SYM_START and SYM_END in __CFI_TYPE() x86/cfi: Add __init_or_module annotations for fineibt

Merge branch 'mm-stable-6d098029de09' of https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm into kho-scratch

2026-07-30T07:53:28Z

x86/boot/compressed: Disable jump tables

2026-07-23T08:06:58Z

After a recent upstream LLVM change to start generating jump and lookup tables in switch statements in more instances [1], linking the compressed x86 boot image when CONFIG_KERNEL_ZSTD is enabled fails with: ld.lld: error: Unexpected run-time relocations (.rela) detected! Dumping the relocations in misc.o, which is the only file influenced by CONFIG_KERNEL_ZSTD in the decompressor, shows dynamic relocations to some string constants, which correspond to the string literals in the switch statement in handle_zstd_error(): Relocation section '.rela.data.rel.ro' at offset 0x277b0 contains 31 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000006600000001 R_X86_64_64 0000000000000000 .rodata.str1.1 + 73a 0000000000000008 0000006600000001 R_X86_64_64 0000000000000000 .rodata.str1.1 + 78e 0000000000000010 0000006600000001 R_X86_64_64 0000000000000000 .rodata.str1.1 + 78e 0000000000000018 0000006600000001 R_X86_64_64 0000000000000000 .rodata.str1.1 + 78e ... This optimization is problematic for the decompressor environment, as it is built as -fPIE without any explicit absolute references (as described at the top of misc.c) while not applying any dynamic relocations, hence the linker assertion. To opt out of this optimization, which is of little value in this special early boot code, and to mirror the other x86 startup code in arch/x86/boot/startup, disable jump tables in the decompressor. Signed-off-by: Nathan Chancellor Signed-off-by: Ingo Molnar Acked-by: Ard Biesheuvel Cc: Bill Wendling Cc: Justin Stitt Cc: Nick Desaulniers Cc: "H. Peter Anvin" Cc: Peter Zijlstra Cc: stable@vger.kernel.org Link: https://github.com/llvm/llvm-project/commit/fa02a6ed66b1700c996b49c96c6bc0eb014c9518 [1] Link: https://patch.msgid.link/20260722-x86-boot-compressed-disable-jt-clang-v2-1-7373d38482fb@kernel.org Closes: https://github.com/ClangBuiltLinux/linux/issues/2165

x86/boot: Reject too long acpi_rsdp= values

2026-07-12T02:25:26Z

cmdline_find_option() returns the full length of the parsed acpi_rsdp= value. get_cmdline_acpi_rsdp() then silently truncates values which do not fit in the val[] buffer. Prevent boot_kstrtoul() from parsing a truncated value and then the kernel from silently using the wrong RSDP address, see discussion in Link:. Issue a warning so that the user is aware that s/he supplied a malformed value and can get feedback instead of silent crashes. [ bp: Make commit message more precise. ] Fixes: 3c98e71b42a7 ("x86/boot: Add "acpi_rsdp=" early parsing") Signed-off-by: Thorsten Blum Signed-off-by: Borislav Petkov (AMD) Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20260617130417.36651-4-thorsten.blum@linux.dev

x86/boot/compressed/head_64.S: Clean up SEV-related comments

2026-07-10T09:21:51Z

Move the comment about setting the encryption mask above the line which does that and, especially, inside the ifdeffery, where it belongs. Move comments on top of the code lines they refer to and not on the side, which impairs readability. No functional changes. Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Ingo Molnar Reviewed-by: Tom Lendacky Link: https://patch.msgid.link/20260620043757.347076-1-bp@kernel.org

x86/setup: do not include kexec_handover.h from asm/setup.h

2026-07-07T05:51:52Z

x86 asm/setup.h includes linux/kexec_handover.h. This is because it is used by setup.c and kaslr.c. But this inclusion is problematic. The header is included in many places, so it results in the KHO header being propagated there. Also, the setup header is used by realmode code. If KHO header includes things like mm.h, it causes a big dump of compilation failures. Nothing in setup.h uses anything from KHO. Remove the header from setup.h, and directly include it in setup.c. which does use things from KHO. Since kaslr.c is a part of the decompressor, avoid including linux headers there directly. Instead, split out struct kho_scratch, which is the only thing the kaslr.c uses, and move it to include/asm-generic/kexec_handover.h. This should also help reduce files recompiled when kexec_handover.h changes. Signed-off-by: Pratyush Yadav (Google) Acked-by: Borislav Petkov (AMD) Link: https://patch.msgid.link/20260706153751.1166003-1-pratyush@kernel.org Signed-off-by: Mike Rapoport (Microsoft)

Merge tag 'x86_cleanups_for_v7.2_rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

2026-06-16T00:11:22Z

Pull x86 cleanups from Borislav Petkov: - The usual pile of cleanups and fixlets the cat dragged in * tag 'x86_cleanups_for_v7.2_rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip: x86/cpu: Remove obsolete aperfmperf_get_khz() declaration x86/pmem: Check for platform_device_alloc() retval x86/platform/uv: Use str_enabled_disabled() in uv_nmi_setup_hubless_intr() x86/cpu: Keep the PROCESSOR_SELECT menu together x86/tlb: Convert copy_from_user() + kstrtouint() to kstrtouint_from_user() x86/purgatory: Fix #endif comment x86/boot: Get rid of kstrtoull() x86/boot/compressed: Use boot_kstrtoul() for hugepages= parsing

treewide: Explicitly include the x86 CPUID headers

2026-05-06T12:29:59Z

Modify all CPUID call sites which implicitly include any of the CPUID headers to explicitly include them instead. For KVM's reverse_cpuid.h, just include since it references the CPUID_EAX..EDX symbols without using the CPUID APIs. Note, this allows removing the inclusion of from within next. That allows the CPUID API headers to include without introducing a circular dependency. Signed-off-by: Ahmed S. Darwish Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/20260327021645.555257-1-darwi@linutronix.de

x86/boot/compressed: Use boot_kstrtoul() for hugepages= parsing

2026-05-04T12:16:11Z

Replace simple_strtoull() with boot_kstrtoul() for parsing the hugepages= boot parameter. Unlike simple_strtoull(), boot_kstrtoul() performs strict validation and returns an error on invalid inputs instead of silently accepting partial input. Use boot_kstrtoul() to reject and warn about invalid hugepages= values. boot_kstrtoul() also converts the input directly to an unsigned long and avoids implicit casting as max_gb_huge_pages *is* an unsigned long. [ bp: Massage commit message. ] Signed-off-by: Thorsten Blum Signed-off-by: Borislav Petkov (AMD) Link: https://patch.msgid.link/20260409161600.152012-2-thorsten.blum@linux.dev