kernel/linux.git/arch/x86/include/asm/text-patching.h, branch v6.19.11

KVM: x86: Implement test_cc() in C

2025-08-18T12:23:04+00:00

Current test_cc() uses the fastop infrastructure to test flags using SETcc instructions. However, int3_emulate_jcc() already fully implements the flags->CC mapping, use that. Removes a pile of gnarly asm. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Sean Christopherson Link: https://lkml.kernel.org/r/20250714103439.637049932@infradead.org

x86/alternatives: Rename 'apply_relocation()' to 'text_poke_apply_relocation()'

2025-04-11T09:01:35+00:00

Join the text_poke_*() API namespace. Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-52-mingo@kernel.org

x86/alternatives: Rename 'POKE_MAX_OPCODE_SIZE' to 'TEXT_POKE_MAX_OPCODE_SIZE'

2025-04-11T09:01:35+00:00

Join the TEXT_POKE_ namespace. Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-47-mingo@kernel.org

x86/alternatives: Rename 'text_poke_sync()' to 'smp_text_poke_sync_each_cpu()'

2025-04-11T09:01:34+00:00

Unlike sync_core(), text_poke_sync() is a very heavy operation, as it sends an IPI to every online CPU in the system and waits for completion. Reflect this in the name. Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-41-mingo@kernel.org

x86/alternatives: Rename 'text_poke_queue()' to 'smp_text_poke_batch_add()'

2025-04-11T09:01:33+00:00

This name is actively confusing as well, because the simple text_poke*() APIs use MM-switching based code patching, while text_poke_queue() is part of the INT3 based text_poke_int3_*() machinery that is an additional layer of functionality on top of regular text_poke*() functionality. Rename it to smp_text_poke_batch_add() to make it clear which layer it belongs to. Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-17-mingo@kernel.org

x86/alternatives: Rename 'text_poke_finish()' to 'smp_text_poke_batch_finish()'

2025-04-11T09:01:33+00:00

This name is actively confusing as well, because the simple text_poke*() APIs use MM-switching based code patching, while text_poke_finish() is part of the INT3 based text_poke_int3_*() machinery that is an additional layer of functionality on top of regular text_poke*() functionality. Rename it to smp_text_poke_batch_finish() to make it clear which layer it belongs to. Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-16-mingo@kernel.org

x86/alternatives: Update comments in int3_emulate_push()

2025-04-11T09:01:33+00:00

The idtentry macro in entry_64.S hasn't had a create_gap option for 5 years - update the comment. (Also clean up the entire comment block while at it.) Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-13-mingo@kernel.org

x86/alternatives: Rename 'poking_addr' to 'text_poke_mm_addr'

2025-04-11T09:01:33+00:00

Put it into the text_poke_* namespace of . Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-10-mingo@kernel.org

x86/alternatives: Rename 'poking_mm' to 'text_poke_mm'

2025-04-11T09:01:33+00:00

x86/alternatives: Rename 'poke_int3_handler()' to 'smp_text_poke_int3_handler()'

2025-04-11T09:01:33+00:00

All related functions in this subsystem already have a text_poke_int3_ prefix - add it to the trap handler as well. Signed-off-by: Ingo Molnar Cc: Juergen Gross Cc: "H . Peter Anvin" Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250411054105.2341982-8-mingo@kernel.org