From 7725acaa4f0c04fbefb0e0d342635b967bb7d414 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 14 Jun 2023 01:39:22 +0200 Subject: init: Provide arch_cpu_finalize_init() check_bugs() has become a dumping ground for all sorts of activities to finalize the CPU initialization before running the rest of the init code. Most are empty, a few do actual bug checks, some do alternative patching and some cobble a CPU advertisement string together.... Aside of that the current implementation requires duplicated function declaration and mostly empty header files for them. Provide a new function arch_cpu_finalize_init(). Provide a generic declaration if CONFIG_ARCH_HAS_CPU_FINALIZE_INIT is selected and a stub inline otherwise. This requires a temporary #ifdef in start_kernel() which will be removed along with check_bugs() once the architectures are converted over. Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20230613224544.957805717@linutronix.de --- init/main.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'init') diff --git a/init/main.c b/init/main.c index af50044deed5..77d53167f4c7 100644 --- a/init/main.c +++ b/init/main.c @@ -1078,7 +1078,11 @@ asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(v taskstats_init_early(); delayacct_init(); + arch_cpu_finalize_init(); + /* Temporary conditional until everything has been converted */ +#ifndef CONFIG_ARCH_HAS_CPU_FINALIZE_INIT check_bugs(); +#endif acpi_subsystem_init(); arch_post_acpi_subsys_init(); -- cgit v1.2.3 From 61235b24b9cb37c13fcad5b9596d59a1afdcec30 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 14 Jun 2023 01:39:38 +0200 Subject: init: Remove check_bugs() leftovers Everything is converted over to arch_cpu_finalize_init(). Remove the check_bugs() leftovers including the empty stubs in asm-generic, alpha, parisc, powerpc and xtensa. Signed-off-by: Thomas Gleixner Reviewed-by: Richard Henderson Link: https://lore.kernel.org/r/20230613224545.553215951@linutronix.de --- arch/alpha/include/asm/bugs.h | 20 -------------------- arch/parisc/include/asm/bugs.h | 20 -------------------- arch/powerpc/include/asm/bugs.h | 15 --------------- arch/xtensa/include/asm/bugs.h | 18 ------------------ include/asm-generic/bugs.h | 11 ----------- init/main.c | 5 ----- 6 files changed, 89 deletions(-) delete mode 100644 arch/alpha/include/asm/bugs.h delete mode 100644 arch/parisc/include/asm/bugs.h delete mode 100644 arch/powerpc/include/asm/bugs.h delete mode 100644 arch/xtensa/include/asm/bugs.h delete mode 100644 include/asm-generic/bugs.h (limited to 'init') diff --git a/arch/alpha/include/asm/bugs.h b/arch/alpha/include/asm/bugs.h deleted file mode 100644 index 78030d1c7e7e..000000000000 --- a/arch/alpha/include/asm/bugs.h +++ /dev/null @@ -1,20 +0,0 @@ -/* - * include/asm-alpha/bugs.h - * - * Copyright (C) 1994 Linus Torvalds - */ - -/* - * This is included by init/main.c to check for architecture-dependent bugs. - * - * Needs: - * void check_bugs(void); - */ - -/* - * I don't know of any alpha bugs yet.. Nice chip - */ - -static void check_bugs(void) -{ -} diff --git a/arch/parisc/include/asm/bugs.h b/arch/parisc/include/asm/bugs.h deleted file mode 100644 index 0a7f9db6bd1c..000000000000 --- a/arch/parisc/include/asm/bugs.h +++ /dev/null @@ -1,20 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * include/asm-parisc/bugs.h - * - * Copyright (C) 1999 Mike Shaver - */ - -/* - * This is included by init/main.c to check for architecture-dependent bugs. - * - * Needs: - * void check_bugs(void); - */ - -#include - -static inline void check_bugs(void) -{ -// identify_cpu(&boot_cpu_data); -} diff --git a/arch/powerpc/include/asm/bugs.h b/arch/powerpc/include/asm/bugs.h deleted file mode 100644 index 01b8f6ca4dbb..000000000000 --- a/arch/powerpc/include/asm/bugs.h +++ /dev/null @@ -1,15 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -#ifndef _ASM_POWERPC_BUGS_H -#define _ASM_POWERPC_BUGS_H - -/* - */ - -/* - * This file is included by 'init/main.c' to check for - * architecture-dependent bugs. - */ - -static inline void check_bugs(void) { } - -#endif /* _ASM_POWERPC_BUGS_H */ diff --git a/arch/xtensa/include/asm/bugs.h b/arch/xtensa/include/asm/bugs.h deleted file mode 100644 index 69b29d198249..000000000000 --- a/arch/xtensa/include/asm/bugs.h +++ /dev/null @@ -1,18 +0,0 @@ -/* - * include/asm-xtensa/bugs.h - * - * This is included by init/main.c to check for architecture-dependent bugs. - * - * Xtensa processors don't have any bugs. :) - * - * This file is subject to the terms and conditions of the GNU General - * Public License. See the file "COPYING" in the main directory of - * this archive for more details. - */ - -#ifndef _XTENSA_BUGS_H -#define _XTENSA_BUGS_H - -static void check_bugs(void) { } - -#endif /* _XTENSA_BUGS_H */ diff --git a/include/asm-generic/bugs.h b/include/asm-generic/bugs.h deleted file mode 100644 index 69021830f078..000000000000 --- a/include/asm-generic/bugs.h +++ /dev/null @@ -1,11 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef __ASM_GENERIC_BUGS_H -#define __ASM_GENERIC_BUGS_H -/* - * This file is included by 'init/main.c' to check for - * architecture-dependent bugs. - */ - -static inline void check_bugs(void) { } - -#endif /* __ASM_GENERIC_BUGS_H */ diff --git a/init/main.c b/init/main.c index 77d53167f4c7..389ac6248677 100644 --- a/init/main.c +++ b/init/main.c @@ -103,7 +103,6 @@ #include #include -#include #include #include #include @@ -1079,10 +1078,6 @@ asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(v delayacct_init(); arch_cpu_finalize_init(); - /* Temporary conditional until everything has been converted */ -#ifndef CONFIG_ARCH_HAS_CPU_FINALIZE_INIT - check_bugs(); -#endif acpi_subsystem_init(); arch_post_acpi_subsys_init(); -- cgit v1.2.3 From 9df9d2f0471b4c4702670380b8d8a45b40b23a7d Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 14 Jun 2023 01:39:39 +0200 Subject: init: Invoke arch_cpu_finalize_init() earlier X86 is reworking the boot process so that initializations which are not required during early boot can be moved into the late boot process and out of the fragile and restricted initial boot phase. arch_cpu_finalize_init() is the obvious place to do such initializations, but arch_cpu_finalize_init() is invoked too late in start_kernel() e.g. for initializing the FPU completely. fork_init() requires that the FPU is initialized as the size of task_struct on X86 depends on the size of the required FPU register buffer. Fortunately none of the init calls between calibrate_delay() and arch_cpu_finalize_init() is relevant for the functionality of arch_cpu_finalize_init(). Invoke it right after calibrate_delay() where everything which is relevant for arch_cpu_finalize_init() has been set up already. No functional change intended. Signed-off-by: Thomas Gleixner Reviewed-by: Rick Edgecombe Link: https://lore.kernel.org/r/20230613224545.612182854@linutronix.de --- init/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'init') diff --git a/init/main.c b/init/main.c index 389ac6248677..c968c198555a 100644 --- a/init/main.c +++ b/init/main.c @@ -1041,6 +1041,8 @@ asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(v sched_clock_init(); calibrate_delay(); + arch_cpu_finalize_init(); + /* * This needs to be called before any devices perform DMA * operations that might use the SWIOTLB bounce buffers. It will @@ -1077,8 +1079,6 @@ asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(v taskstats_init_early(); delayacct_init(); - arch_cpu_finalize_init(); - acpi_subsystem_init(); arch_post_acpi_subsys_init(); kcsan_init(); -- cgit v1.2.3 From 439e17576eb47f26b78c5bbc72e344d4206d2327 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 14 Jun 2023 01:39:41 +0200 Subject: init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init() Invoke the X86ism mem_encrypt_init() from X86 arch_cpu_finalize_init() and remove the weak fallback from the core code. No functional change. Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20230613224545.670360645@linutronix.de --- arch/x86/include/asm/mem_encrypt.h | 7 ++++--- arch/x86/kernel/cpu/common.c | 11 +++++++++++ init/main.c | 13 ------------- 3 files changed, 15 insertions(+), 16 deletions(-) (limited to 'init') diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h index b7126701574c..98ce265f2e33 100644 --- a/arch/x86/include/asm/mem_encrypt.h +++ b/arch/x86/include/asm/mem_encrypt.h @@ -51,6 +51,8 @@ void __init mem_encrypt_free_decrypted_mem(void); void __init sev_es_init_vc_handling(void); +void __init mem_encrypt_init(void); + #define __bss_decrypted __section(".bss..decrypted") #else /* !CONFIG_AMD_MEM_ENCRYPT */ @@ -83,13 +85,12 @@ early_set_mem_enc_dec_hypercall(unsigned long vaddr, int npages, bool enc) {} static inline void mem_encrypt_free_decrypted_mem(void) { } +static inline void mem_encrypt_init(void) { } + #define __bss_decrypted #endif /* CONFIG_AMD_MEM_ENCRYPT */ -/* Architecture __weak replacement functions */ -void __init mem_encrypt_init(void); - void add_encrypt_protection_map(void); /* diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 18612e5e757c..5ee8b31ef16c 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -2414,4 +2415,14 @@ void __init arch_cpu_finalize_init(void) } else { fpu__init_check_bugs(); } + + /* + * This needs to be called before any devices perform DMA + * operations that might use the SWIOTLB bounce buffers. It will + * mark the bounce buffers as decrypted so that their usage will + * not cause "plain-text" data to be decrypted when accessed. It + * must be called after late_time_init() so that Hyper-V x86/x64 + * hypercalls work when the SWIOTLB bounce buffers are decrypted. + */ + mem_encrypt_init(); } diff --git a/init/main.c b/init/main.c index c968c198555a..32c65f28d84a 100644 --- a/init/main.c +++ b/init/main.c @@ -95,7 +95,6 @@ #include #include #include -#include #include #include #include @@ -786,8 +785,6 @@ void __init __weak thread_stack_cache_init(void) } #endif -void __init __weak mem_encrypt_init(void) { } - void __init __weak poking_init(void) { } void __init __weak pgtable_cache_init(void) { } @@ -1043,16 +1040,6 @@ asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(v arch_cpu_finalize_init(); - /* - * This needs to be called before any devices perform DMA - * operations that might use the SWIOTLB bounce buffers. It will - * mark the bounce buffers as decrypted so that their usage will - * not cause "plain-text" data to be decrypted when accessed. It - * must be called after late_time_init() so that Hyper-V x86/x64 - * hypercalls work when the SWIOTLB bounce buffers are decrypted. - */ - mem_encrypt_init(); - pid_idr_init(); anon_vma_init(); #ifdef CONFIG_X86 -- cgit v1.2.3