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x86/gsseg: Move load_gs_index() to its own new header file

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GS is a special segment on x86_64, move load_gs_index() to its own new
header file to simplify header inclusion.

No change in functionality.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230112072032.35626-5-xin3.li@intel.com
This commit is contained in:
H. Peter Anvin (Intel) 2023-01-11 23:20:31 -08:00 • committed by Ingo Molnar
parent df729fb05a
commit ae53fa1870
6 changed files with 45 additions and 21 deletions
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41
arch/x86/include/asm/gsseg.h Normal file
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@ -0,0 +1,41 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _ASM_X86_GSSEG_H
#define _ASM_X86_GSSEG_H
#include <linux/types.h>
#include <asm/asm.h>
#include <asm/cpufeature.h>
#include <asm/alternative.h>
#include <asm/processor.h>
#include <asm/nops.h>
#ifdef CONFIG_X86_64
extern asmlinkage void asm_load_gs_index(u16 selector);
static inline void native_load_gs_index(unsigned int selector)
{
unsigned long flags;
local_irq_save(flags);
asm_load_gs_index(selector);
local_irq_restore(flags);
}
#endif /* CONFIG_X86_64 */
#ifndef CONFIG_PARAVIRT_XXL
static inline void load_gs_index(unsigned int selector)
{
#ifdef CONFIG_X86_64
native_load_gs_index(selector);
#else
loadsegment(gs, selector);
#endif
}
#endif /* CONFIG_PARAVIRT_XXL */
#endif /* _ASM_X86_GSSEG_H */

1
arch/x86/include/asm/mmu_context.h
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@ -12,6 +12,7 @@
#include <asm/tlbflush.h>
#include <asm/paravirt.h>
#include <asm/debugreg.h>
#include <asm/gsseg.h>
extern atomic64_t last_mm_ctx_id;

21
arch/x86/include/asm/special_insns.h
View file

@ -120,17 +120,6 @@ static inline void native_wbinvd(void)
asm volatile("wbinvd": : :"memory");
}
extern asmlinkage void asm_load_gs_index(u16 selector);
static inline void native_load_gs_index(unsigned int selector)
{
unsigned long flags;
local_irq_save(flags);
asm_load_gs_index(selector);
local_irq_restore(flags);
}
static inline unsigned long __read_cr4(void)
{
return native_read_cr4();
@ -184,16 +173,6 @@ static inline void wbinvd(void)
native_wbinvd();
}
static inline void load_gs_index(unsigned int selector)
{
#ifdef CONFIG_X86_64
native_load_gs_index(selector);
#else
loadsegment(gs, selector);
#endif
}
#endif /* CONFIG_PARAVIRT_XXL */
static inline void clflush(volatile void *__p)

1
arch/x86/kernel/paravirt.c
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@ -32,6 +32,7 @@
#include <asm/special_insns.h>
#include <asm/tlb.h>
#include <asm/io_bitmap.h>
#include <asm/gsseg.h>
/*
* nop stub, which must not clobber anything *including the stack* to

1
arch/x86/kernel/signal_32.c
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@ -31,6 +31,7 @@
#include <asm/sigframe.h>
#include <asm/sighandling.h>
#include <asm/smap.h>
#include <asm/gsseg.h>
#ifdef CONFIG_IA32_EMULATION
#include <asm/ia32_unistd.h>

1
arch/x86/kernel/tls.c
View file

@ -12,6 +12,7 @@
#include <asm/ldt.h>
#include <asm/processor.h>
#include <asm/proto.h>
#include <asm/gsseg.h>
#include "tls.h"