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x86/vdso: Move VDSO image init to vdso2c generated code

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Generate an init function for each VDSO image, replacing init_vdso() and
sysenter_setup().

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230124184019.26850-1-brgerst@gmail.com
This commit is contained in:
Brian Gerst 2023-01-24 13:40:19 -05:00 committed by Ingo Molnar
parent 2241ab53cb
commit 4c382d723e
6 changed files with 11 additions and 27 deletions
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6
arch/x86/entry/vdso/vdso2c.h
View File

@ -179,6 +179,7 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
fprintf(outfile, "/* AUTOMATICALLY GENERATED -- DO NOT EDIT */\n\n");
fprintf(outfile, "#include <linux/linkage.h>\n");
fprintf(outfile, "#include <linux/init.h>\n");
fprintf(outfile, "#include <asm/page_types.h>\n");
fprintf(outfile, "#include <asm/vdso.h>\n");
fprintf(outfile, "\n");
@ -218,5 +219,10 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
fprintf(outfile, "\t.sym_%s = %" PRIi64 ",\n",
required_syms[i].name, (int64_t)syms[i]);
}
fprintf(outfile, "};\n\n");
fprintf(outfile, "static __init int init_%s(void) {\n", image_name);
fprintf(outfile, "\treturn init_vdso_image(&%s);\n", image_name);
fprintf(outfile, "};\n");
fprintf(outfile, "subsys_initcall(init_%s);\n", image_name);
}

9
arch/x86/entry/vdso/vdso32-setup.c
View File

@ -51,17 +51,8 @@ __setup("vdso32=", vdso32_setup);
__setup_param("vdso=", vdso_setup, vdso32_setup, 0);
#endif
int __init sysenter_setup(void)
{
init_vdso_image(&vdso_image_32);
return 0;
}
#ifdef CONFIG_X86_64
subsys_initcall(sysenter_setup);
#ifdef CONFIG_SYSCTL
/* Register vsyscall32 into the ABI table */
#include <linux/sysctl.h>

19
arch/x86/entry/vdso/vma.c
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@ -44,13 +44,16 @@ unsigned int vclocks_used __read_mostly;
unsigned int __read_mostly vdso64_enabled = 1;
#endif
void __init init_vdso_image(const struct vdso_image *image)
int __init init_vdso_image(const struct vdso_image *image)
{
BUILD_BUG_ON(VDSO_CLOCKMODE_MAX >= 32);
BUG_ON(image->size % PAGE_SIZE != 0);
apply_alternatives((struct alt_instr *)(image->data + image->alt),
(struct alt_instr *)(image->data + image->alt +
image->alt_len));
return 0;
}
static const struct vm_special_mapping vvar_mapping;
@ -418,18 +421,4 @@ static __init int vdso_setup(char *s)
return 1;
}
__setup("vdso=", vdso_setup);
static int __init init_vdso(void)
{
BUILD_BUG_ON(VDSO_CLOCKMODE_MAX >= 32);
init_vdso_image(&vdso_image_64);
#ifdef CONFIG_X86_X32_ABI
init_vdso_image(&vdso_image_x32);
#endif
return 0;
}
subsys_initcall(init_vdso);
#endif /* CONFIG_X86_64 */

1
arch/x86/include/asm/processor.h
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@ -542,7 +542,6 @@ enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
IDLE_POLL};
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);
/* Defined in head.S */

2
arch/x86/include/asm/vdso.h
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@ -45,7 +45,7 @@ extern const struct vdso_image vdso_image_x32;
extern const struct vdso_image vdso_image_32;
#endif
extern void __init init_vdso_image(const struct vdso_image *image);
extern int __init init_vdso_image(const struct vdso_image *image);
extern int map_vdso_once(const struct vdso_image *image, unsigned long addr);

1
arch/x86/kernel/cpu/common.c
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@ -1953,7 +1953,6 @@ void __init identify_boot_cpu(void)
if (HAS_KERNEL_IBT && cpu_feature_enabled(X86_FEATURE_IBT))
pr_info("CET detected: Indirect Branch Tracking enabled\n");
#ifdef CONFIG_X86_32
sysenter_setup();
enable_sep_cpu();
#endif
cpu_detect_tlb(&boot_cpu_data);