x86/boot: Move startup code out of __head section

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.

  [ bp: Fold in hunk to fix 32-bit CPU hotplug:
    Reported-by: kernel test robot <oliver.sang@intel.com>
    Closes: https://lore.kernel.org/oe-lkp/202509022207.56fd97f4-lkp@intel.com ]

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250828102202.1849035-45-ardb+git@google.com

1 files changed, 18 insertions, 18 deletions

diff --git a/arch/x86/boot/startup/sev-shared.c b/arch/x86/boot/startup/sev-shared.c
index e09c66845e43..08cc1568d8af 100644
--- a/arch/x86/boot/startup/sev-shared.c
+++ b/arch/x86/boot/startup/sev-shared.c
@@ -33,7 +33,7 @@ static u32 cpuid_ext_range_max __ro_after_init;
 
 bool sev_snp_needs_sfw;
 
-void __head __noreturn
+void __noreturn
 sev_es_terminate(unsigned int set, unsigned int reason)
 {
 	u64 val = GHCB_MSR_TERM_REQ;
@@ -52,7 +52,7 @@ 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;
 
@@ -222,7 +222,7 @@ 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 compacted)
+static u32 snp_cpuid_calc_xsave_size(u64 xfeatures_en, bool compacted)
 {
 	const struct snp_cpuid_table *cpuid_table = snp_cpuid_get_table();
 	u64 xfeatures_found = 0;
@@ -258,7 +258,7 @@ static u32 __head snp_cpuid_calc_xsave_size(u64 xfeatures_en, bool compacted)
 	return xsave_size;
 }
 
-static bool __head
+static bool
 snp_cpuid_get_validated_func(struct cpuid_leaf *leaf)
 {
 	const struct snp_cpuid_table *cpuid_table = snp_cpuid_get_table();
@@ -300,7 +300,7 @@ static void snp_cpuid_hv_msr(void *ctx, struct cpuid_leaf *leaf)
 		sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_CPUID_HV);
 }
 
-static int __head
+static int
 snp_cpuid_postprocess(void (*cpuid_fn)(void *ctx, struct cpuid_leaf *leaf),
 		      void *ctx, struct cpuid_leaf *leaf)
 {
@@ -396,8 +396,8 @@ snp_cpuid_postprocess(void (*cpuid_fn)(void *ctx, struct cpuid_leaf *leaf),
  * Returns -EOPNOTSUPP if feature not enabled. Any other non-zero return value
  * 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 = snp_cpuid_get_table();
 
@@ -439,7 +439,7 @@ 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 = lower_bits(regs->cx, 32);
 	unsigned int fn = lower_bits(regs->ax, 32);
@@ -515,7 +515,7 @@ 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 = NULL;
@@ -543,7 +543,7 @@ 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 memory
  * layout and related mapping facilities throughout the boot process.
  */
-static void __head setup_cpuid_table(const struct cc_blob_sev_info *cc_info)
+static void __init setup_cpuid_table(const struct cc_blob_sev_info *cc_info)
 {
 	const struct snp_cpuid_table *cpuid_table_fw, *cpuid_table;
 	int i;
@@ -571,7 +571,7 @@ static void __head setup_cpuid_table(const struct cc_blob_sev_info *cc_info)
 	}
 }
 
-static int __head svsm_call_msr_protocol(struct svsm_call *call)
+static int svsm_call_msr_protocol(struct svsm_call *call)
 {
 	int ret;
 
@@ -582,8 +582,8 @@ static int __head svsm_call_msr_protocol(struct svsm_call *call)
 	return ret;
 }
 
-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 = {};
@@ -624,8 +624,8 @@ static void __head svsm_pval_4k_page(unsigned long paddr, bool validate,
 	native_local_irq_restore(flags);
 }
 
-static void __head pvalidate_4k_page(unsigned long vaddr, unsigned long paddr,
-				     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;
 
@@ -645,8 +645,8 @@ static void __head pvalidate_4k_page(unsigned long vaddr, unsigned long paddr,
 		sev_evict_cache((void *)vaddr, 1);
 }
 
-static void __head __page_state_change(unsigned long vaddr, unsigned long paddr,
-				       const struct psc_desc *desc)
+static void __page_state_change(unsigned long vaddr, unsigned long paddr,
+			        const struct psc_desc *desc)
 {
 	u64 val, msr;
 
@@ -684,7 +684,7 @@ static void __head __page_state_change(unsigned long vaddr, 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;