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Tue, 22 Jul 2025 00:30:11 -0700 (PDT) Date: Tue, 22 Jul 2025 09:27:30 +0200 In-Reply-To: <20250722072708.2079165-24-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250722072708.2079165-24-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=16950; i=ardb@kernel.org; h=from:subject; bh=fVeLnhMcK1b3fU8c1eD0VKUbOMlV6w0sSzTBkjDFK34=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIaPedvPDufqet4tOhbvsfFUuPbk9+sGJ2PRmdZdrpydY3 9x/VDupo5SFQYyLQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEzkVDPD/8qv80IP73V0e7xm 54PpcQabQ2ac2Nt0evm+2UdrVDZOcprO8Ffo/M2c+a5HZr/c0nBjzalV+76IxExxf5/P7P9ovUL 7eT02AA== X-Mailer: git-send-email 2.50.0.727.gbf7dc18ff4-goog Message-ID: <20250722072708.2079165-45-ardb+git@google.com> Subject: [PATCH v6 21/22] x86/boot: Move startup code out of __head section From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: linux-efi@vger.kernel.org, x86@kernel.org, Ard Biesheuvel , Borislav Petkov , Ingo Molnar , Kevin Loughlin , Tom Lendacky , Josh Poimboeuf , Peter Zijlstra , Nikunj A Dadhania Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel Move startup code out of the __head section, now that this no longer has a special significance. Move everything into .text or .init.text as appropriate, so that startup code is not kept around unnecessarily. Signed-off-by: Ard Biesheuvel --- arch/x86/boot/compressed/sev.c | 3 -- arch/x86/boot/startup/gdt_idt.c | 4 +-- arch/x86/boot/startup/map_kernel.c | 4 +-- arch/x86/boot/startup/sev-shared.c | 36 ++++++++++---------- arch/x86/boot/startup/sev-startup.c | 14 ++++---- arch/x86/boot/startup/sme.c | 26 +++++++------- arch/x86/include/asm/init.h | 6 ---- arch/x86/kernel/head_32.S | 2 +- arch/x86/kernel/head_64.S | 2 +- arch/x86/platform/pvh/head.S | 2 +- 10 files changed, 45 insertions(+), 54 deletions(-) diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index faa6cc2f9990..a7af906145e8 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -32,9 +32,6 @@ struct ghcb *boot_ghcb; #undef __init #define __init =20 -#undef __head -#define __head - #define __BOOT_COMPRESSED =20 u8 snp_vmpl; diff --git a/arch/x86/boot/startup/gdt_idt.c b/arch/x86/boot/startup/gdt_id= t.c index a3112a69b06a..d16102abdaec 100644 --- a/arch/x86/boot/startup/gdt_idt.c +++ b/arch/x86/boot/startup/gdt_idt.c @@ -24,7 +24,7 @@ static gate_desc bringup_idt_table[NUM_EXCEPTION_VECTORS] __page_aligned_d= ata; =20 /* This may run while still in the direct mapping */ -void __head startup_64_load_idt(void *vc_handler) +void startup_64_load_idt(void *vc_handler) { struct desc_ptr desc =3D { .address =3D (unsigned long)rip_rel_ptr(bringup_idt_table), @@ -46,7 +46,7 @@ void __head startup_64_load_idt(void *vc_handler) /* * Setup boot CPU state needed before kernel switches to virtual addresses. */ -void __head startup_64_setup_gdt_idt(void) +void __init startup_64_setup_gdt_idt(void) { struct gdt_page *gp =3D rip_rel_ptr((void *)(__force unsigned long)&gdt_p= age); void *handler =3D NULL; diff --git a/arch/x86/boot/startup/map_kernel.c b/arch/x86/boot/startup/map= _kernel.c index 332dbe6688c4..83ba98d61572 100644 --- a/arch/x86/boot/startup/map_kernel.c +++ b/arch/x86/boot/startup/map_kernel.c @@ -30,7 +30,7 @@ static inline bool check_la57_support(void) return true; } =20 -static unsigned long __head sme_postprocess_startup(struct boot_params *bp, +static unsigned long __init sme_postprocess_startup(struct boot_params *bp, pmdval_t *pmd, unsigned long p2v_offset) { @@ -84,7 +84,7 @@ static unsigned long __head sme_postprocess_startup(struc= t boot_params *bp, * the 1:1 mapping of memory. Kernel virtual addresses can be determined by * subtracting p2v_offset from the RIP-relative address. */ -unsigned long __head __startup_64(unsigned long p2v_offset, +unsigned long __init __startup_64(unsigned long p2v_offset, struct boot_params *bp) { pmd_t (*early_pgts)[PTRS_PER_PMD] =3D rip_rel_ptr(early_dynamic_pgts); diff --git a/arch/x86/boot/startup/sev-shared.c b/arch/x86/boot/startup/sev= -shared.c index 98c2fcb43279..768c80363386 100644 --- a/arch/x86/boot/startup/sev-shared.c +++ b/arch/x86/boot/startup/sev-shared.c @@ -29,7 +29,7 @@ static u32 cpuid_std_range_max __ro_after_init; static u32 cpuid_hyp_range_max __ro_after_init; static u32 cpuid_ext_range_max __ro_after_init; =20 -void __head __noreturn +void __noreturn sev_es_terminate(unsigned int set, unsigned int reason) { u64 val =3D GHCB_MSR_TERM_REQ; @@ -48,7 +48,7 @@ sev_es_terminate(unsigned int set, unsigned int reason) /* * The hypervisor features are available from GHCB version 2 onward. */ -u64 get_hv_features(void) +u64 __init get_hv_features(void) { u64 val; =20 @@ -218,7 +218,7 @@ const struct snp_cpuid_table *snp_cpuid_get_table(void) * * Return: XSAVE area size on success, 0 otherwise. */ -static u32 __head snp_cpuid_calc_xsave_size(u64 xfeatures_en, bool compact= ed) +static u32 snp_cpuid_calc_xsave_size(u64 xfeatures_en, bool compacted) { const struct snp_cpuid_table *cpuid_table =3D snp_cpuid_get_table(); u64 xfeatures_found =3D 0; @@ -254,7 +254,7 @@ static u32 __head snp_cpuid_calc_xsave_size(u64 xfeatur= es_en, bool compacted) return xsave_size; } =20 -static bool __head +static bool snp_cpuid_get_validated_func(struct cpuid_leaf *leaf) { const struct snp_cpuid_table *cpuid_table =3D snp_cpuid_get_table(); @@ -296,7 +296,7 @@ static void snp_cpuid_hv_msr(void *ctx, struct cpuid_le= af *leaf) sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_CPUID_HV); } =20 -static int __head +static int snp_cpuid_postprocess(void (*cpuid_fn)(void *ctx, struct cpuid_leaf *leaf), void *ctx, struct cpuid_leaf *leaf) { @@ -392,8 +392,8 @@ snp_cpuid_postprocess(void (*cpuid_fn)(void *ctx, struc= t cpuid_leaf *leaf), * Returns -EOPNOTSUPP if feature not enabled. Any other non-zero return v= alue * should be treated as fatal by caller. */ -int __head snp_cpuid(void (*cpuid_fn)(void *ctx, struct cpuid_leaf *leaf), - void *ctx, struct cpuid_leaf *leaf) +int snp_cpuid(void (*cpuid_fn)(void *ctx, struct cpuid_leaf *leaf), + void *ctx, struct cpuid_leaf *leaf) { const struct snp_cpuid_table *cpuid_table =3D snp_cpuid_get_table(); =20 @@ -435,7 +435,7 @@ int __head snp_cpuid(void (*cpuid_fn)(void *ctx, struct= cpuid_leaf *leaf), * page yet, so it only supports the MSR based communication with the * hypervisor and only the CPUID exit-code. */ -void __head do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code) +void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code) { unsigned int subfn =3D lower_bits(regs->cx, 32); unsigned int fn =3D lower_bits(regs->ax, 32); @@ -511,7 +511,7 @@ struct cc_setup_data { * Search for a Confidential Computing blob passed in as a setup_data entry * via the Linux Boot Protocol. */ -static __head +static __init struct cc_blob_sev_info *find_cc_blob_setup_data(struct boot_params *bp) { struct cc_setup_data *sd =3D NULL; @@ -539,7 +539,7 @@ struct cc_blob_sev_info *find_cc_blob_setup_data(struct= boot_params *bp) * mapping needs to be updated in sync with all the changes to virtual mem= ory * layout and related mapping facilities throughout the boot process. */ -static void __head setup_cpuid_table(const struct cc_blob_sev_info *cc_inf= o) +static void __init setup_cpuid_table(const struct cc_blob_sev_info *cc_inf= o) { const struct snp_cpuid_table *cpuid_table_fw, *cpuid_table; int i; @@ -567,7 +567,7 @@ static void __head setup_cpuid_table(const struct cc_bl= ob_sev_info *cc_info) } } =20 -static int __head svsm_call_msr_protocol(struct svsm_call *call) +static int svsm_call_msr_protocol(struct svsm_call *call) { int ret; =20 @@ -578,8 +578,8 @@ static int __head svsm_call_msr_protocol(struct svsm_ca= ll *call) return ret; } =20 -static void __head svsm_pval_4k_page(unsigned long paddr, bool validate, - struct svsm_ca *caa, u64 caa_pa) +static void svsm_pval_4k_page(unsigned long paddr, bool validate, + struct svsm_ca *caa, u64 caa_pa) { struct svsm_pvalidate_call *pc; struct svsm_call call =3D {}; @@ -619,8 +619,8 @@ static void __head svsm_pval_4k_page(unsigned long padd= r, bool validate, native_local_irq_restore(flags); } =20 -static void __head pvalidate_4k_page(unsigned long vaddr, unsigned long pa= ddr, - bool validate, struct svsm_ca *caa, u64 caa_pa) +static void pvalidate_4k_page(unsigned long vaddr, unsigned long paddr, + bool validate, struct svsm_ca *caa, u64 caa_pa) { int ret; =20 @@ -633,8 +633,8 @@ static void __head pvalidate_4k_page(unsigned long vadd= r, unsigned long paddr, } } =20 -static void __head __page_state_change(unsigned long vaddr, unsigned long = paddr, - enum psc_op op, struct svsm_ca *caa, u64 caa_pa) +static void __page_state_change(unsigned long vaddr, unsigned long paddr, + enum psc_op op, struct svsm_ca *caa, u64 caa_pa) { u64 val, msr; =20 @@ -672,7 +672,7 @@ static void __head __page_state_change(unsigned long va= ddr, unsigned long paddr, * Maintain the GPA of the SVSM Calling Area (CA) in order to utilize the = SVSM * services needed when not running in VMPL0. */ -static bool __head svsm_setup_ca(const struct cc_blob_sev_info *cc_info, +static bool __init svsm_setup_ca(const struct cc_blob_sev_info *cc_info, void *page) { struct snp_secrets_page *secrets_page; diff --git a/arch/x86/boot/startup/sev-startup.c b/arch/x86/boot/startup/se= v-startup.c index 2f7d21660cdf..7a8128dc076e 100644 --- a/arch/x86/boot/startup/sev-startup.c +++ b/arch/x86/boot/startup/sev-startup.c @@ -44,7 +44,7 @@ /* Include code shared with pre-decompression boot stage */ #include "sev-shared.c" =20 -void __head +void __init early_set_pages_state(unsigned long vaddr, unsigned long paddr, unsigned long npages, enum psc_op op, struct svsm_ca *caa, u64 caa_pa) @@ -64,7 +64,7 @@ early_set_pages_state(unsigned long vaddr, unsigned long = paddr, } } =20 -void __head early_snp_set_memory_private(unsigned long vaddr, unsigned lon= g paddr, +void __init early_snp_set_memory_private(unsigned long vaddr, unsigned lon= g paddr, unsigned long npages) { /* @@ -84,7 +84,7 @@ void __head early_snp_set_memory_private(unsigned long va= ddr, unsigned long padd rip_rel_ptr(&boot_svsm_ca_page), boot_svsm_caa_pa); } =20 -void __head early_snp_set_memory_shared(unsigned long vaddr, unsigned long= paddr, +void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long= paddr, unsigned long npages) { /* @@ -114,7 +114,7 @@ void __head early_snp_set_memory_shared(unsigned long v= addr, unsigned long paddr * * Scan for the blob in that order. */ -static __head struct cc_blob_sev_info *find_cc_blob(struct boot_params *bp) +static struct cc_blob_sev_info *__init find_cc_blob(struct boot_params *bp) { struct cc_blob_sev_info *cc_info; =20 @@ -140,7 +140,7 @@ static __head struct cc_blob_sev_info *find_cc_blob(str= uct boot_params *bp) return cc_info; } =20 -static __head void svsm_setup(struct cc_blob_sev_info *cc_info) +static void __init svsm_setup(struct cc_blob_sev_info *cc_info) { struct snp_secrets_page *secrets =3D (void *)cc_info->secrets_phys; struct svsm_call call =3D {}; @@ -181,7 +181,7 @@ static __head void svsm_setup(struct cc_blob_sev_info *= cc_info) boot_svsm_caa_pa =3D pa; } =20 -bool __head snp_init(struct boot_params *bp) +bool __init snp_init(struct boot_params *bp) { struct cc_blob_sev_info *cc_info; =20 @@ -210,7 +210,7 @@ bool __head snp_init(struct boot_params *bp) return true; } =20 -void __head __noreturn snp_abort(void) +void __init __noreturn snp_abort(void) { sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED); } diff --git a/arch/x86/boot/startup/sme.c b/arch/x86/boot/startup/sme.c index eb6a758ba660..39e7e9d18974 100644 --- a/arch/x86/boot/startup/sme.c +++ b/arch/x86/boot/startup/sme.c @@ -91,7 +91,7 @@ struct sme_populate_pgd_data { */ static char sme_workarea[2 * PMD_SIZE] __section(".init.scratch"); =20 -static void __head sme_clear_pgd(struct sme_populate_pgd_data *ppd) +static void __init sme_clear_pgd(struct sme_populate_pgd_data *ppd) { unsigned long pgd_start, pgd_end, pgd_size; pgd_t *pgd_p; @@ -106,7 +106,7 @@ static void __head sme_clear_pgd(struct sme_populate_pg= d_data *ppd) memset(pgd_p, 0, pgd_size); } =20 -static pud_t __head *sme_prepare_pgd(struct sme_populate_pgd_data *ppd) +static pud_t __init *sme_prepare_pgd(struct sme_populate_pgd_data *ppd) { pgd_t *pgd; p4d_t *p4d; @@ -143,7 +143,7 @@ static pud_t __head *sme_prepare_pgd(struct sme_populat= e_pgd_data *ppd) return pud; } =20 -static void __head sme_populate_pgd_large(struct sme_populate_pgd_data *pp= d) +static void __init sme_populate_pgd_large(struct sme_populate_pgd_data *pp= d) { pud_t *pud; pmd_t *pmd; @@ -159,7 +159,7 @@ static void __head sme_populate_pgd_large(struct sme_po= pulate_pgd_data *ppd) set_pmd(pmd, __pmd(ppd->paddr | ppd->pmd_flags)); } =20 -static void __head sme_populate_pgd(struct sme_populate_pgd_data *ppd) +static void __init sme_populate_pgd(struct sme_populate_pgd_data *ppd) { pud_t *pud; pmd_t *pmd; @@ -185,7 +185,7 @@ static void __head sme_populate_pgd(struct sme_populate= _pgd_data *ppd) set_pte(pte, __pte(ppd->paddr | ppd->pte_flags)); } =20 -static void __head __sme_map_range_pmd(struct sme_populate_pgd_data *ppd) +static void __init __sme_map_range_pmd(struct sme_populate_pgd_data *ppd) { while (ppd->vaddr < ppd->vaddr_end) { sme_populate_pgd_large(ppd); @@ -195,7 +195,7 @@ static void __head __sme_map_range_pmd(struct sme_popul= ate_pgd_data *ppd) } } =20 -static void __head __sme_map_range_pte(struct sme_populate_pgd_data *ppd) +static void __init __sme_map_range_pte(struct sme_populate_pgd_data *ppd) { while (ppd->vaddr < ppd->vaddr_end) { sme_populate_pgd(ppd); @@ -205,7 +205,7 @@ static void __head __sme_map_range_pte(struct sme_popul= ate_pgd_data *ppd) } } =20 -static void __head __sme_map_range(struct sme_populate_pgd_data *ppd, +static void __init __sme_map_range(struct sme_populate_pgd_data *ppd, pmdval_t pmd_flags, pteval_t pte_flags) { unsigned long vaddr_end; @@ -229,22 +229,22 @@ static void __head __sme_map_range(struct sme_populat= e_pgd_data *ppd, __sme_map_range_pte(ppd); } =20 -static void __head sme_map_range_encrypted(struct sme_populate_pgd_data *p= pd) +static void __init sme_map_range_encrypted(struct sme_populate_pgd_data *p= pd) { __sme_map_range(ppd, PMD_FLAGS_ENC, PTE_FLAGS_ENC); } =20 -static void __head sme_map_range_decrypted(struct sme_populate_pgd_data *p= pd) +static void __init sme_map_range_decrypted(struct sme_populate_pgd_data *p= pd) { __sme_map_range(ppd, PMD_FLAGS_DEC, PTE_FLAGS_DEC); } =20 -static void __head sme_map_range_decrypted_wp(struct sme_populate_pgd_data= *ppd) +static void __init sme_map_range_decrypted_wp(struct sme_populate_pgd_data= *ppd) { __sme_map_range(ppd, PMD_FLAGS_DEC_WP, PTE_FLAGS_DEC_WP); } =20 -static unsigned long __head sme_pgtable_calc(unsigned long len) +static unsigned long __init sme_pgtable_calc(unsigned long len) { unsigned long entries =3D 0, tables =3D 0; =20 @@ -281,7 +281,7 @@ static unsigned long __head sme_pgtable_calc(unsigned l= ong len) return entries + tables; } =20 -void __head sme_encrypt_kernel(struct boot_params *bp) +void __init sme_encrypt_kernel(struct boot_params *bp) { unsigned long workarea_start, workarea_end, workarea_len; unsigned long execute_start, execute_end, execute_len; @@ -485,7 +485,7 @@ void __head sme_encrypt_kernel(struct boot_params *bp) native_write_cr3(__native_read_cr3()); } =20 -void __head sme_enable(struct boot_params *bp) +void __init sme_enable(struct boot_params *bp) { unsigned int eax, ebx, ecx, edx; unsigned long feature_mask; diff --git a/arch/x86/include/asm/init.h b/arch/x86/include/asm/init.h index 8b1b1abcef15..01ccdd168df0 100644 --- a/arch/x86/include/asm/init.h +++ b/arch/x86/include/asm/init.h @@ -2,12 +2,6 @@ #ifndef _ASM_X86_INIT_H #define _ASM_X86_INIT_H =20 -#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 170000 -#define __head __section(".head.text") __no_sanitize_undefined __no_stack_= protector -#else -#define __head __section(".head.text") __no_sanitize_undefined -#endif - struct x86_mapping_info { void *(*alloc_pgt_page)(void *); /* allocate buf for page table */ void (*free_pgt_page)(void *, void *); /* free buf for page table */ diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 76743dfad6ab..437effb1ef03 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -61,7 +61,7 @@ RESERVE_BRK(pagetables, INIT_MAP_SIZE) * any particular GDT layout, because we load our own as soon as we * can. */ -__HEAD + __INIT SYM_CODE_START(startup_32) movl pa(initial_stack),%ecx =09 diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index d219963ecb60..21816b48537c 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -33,7 +33,7 @@ * because we need identity-mapped pages. */ =20 - __HEAD + __INIT .code64 SYM_CODE_START_NOALIGN(startup_64) UNWIND_HINT_END_OF_STACK diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S index 1d78e5631bb8..344030c1a81d 100644 --- a/arch/x86/platform/pvh/head.S +++ b/arch/x86/platform/pvh/head.S @@ -24,7 +24,7 @@ #include #include =20 - __HEAD + __INIT =20 /* * Entry point for PVH guests. --=20 2.50.0.727.gbf7dc18ff4-goog