From 9f9d489a3e78b49d897734eaaf9dea568dbea66e Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 25 Jun 2008 00:19:32 -0400 Subject: [PATCH] x86/paravirt, 64-bit: make load_gs_index() a paravirt operation Signed-off-by: Eduardo Habkost Signed-off-by: Jeremy Fitzhardinge Cc: xen-devel Cc: Stephen Tweedie Cc: Eduardo Habkost Cc: Mark McLoughlin Signed-off-by: Ingo Molnar --- arch/x86/kernel/entry_64.S | 4 ++-- arch/x86/kernel/paravirt.c | 3 +++ include/asm-x86/elf.h | 2 +- include/asm-x86/paravirt.h | 10 ++++++++++ include/asm-x86/system.h | 3 ++- 5 files changed, 18 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 70fe13a..07d69f2 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -944,7 +944,7 @@ KPROBE_END(error_entry) /* Reload gs selector with exception handling */ /* edi: new selector */ -ENTRY(load_gs_index) +ENTRY(native_load_gs_index) CFI_STARTPROC pushf CFI_ADJUST_CFA_OFFSET 8 @@ -958,7 +958,7 @@ gs_change: CFI_ADJUST_CFA_OFFSET -8 ret CFI_ENDPROC -ENDPROC(load_gs_index) +ENDPROC(native_load_gs_index) .section __ex_table,"a" .align 8 diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index b20c369..27819e3 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -329,6 +329,9 @@ struct pv_cpu_ops pv_cpu_ops = { .store_idt = native_store_idt, .store_tr = native_store_tr, .load_tls = native_load_tls, +#ifdef CONFIG_X86_64 + .load_gs_index = native_load_gs_index, +#endif .write_ldt_entry = native_write_ldt_entry, .write_gdt_entry = native_write_gdt_entry, .write_idt_entry = native_write_idt_entry, diff --git a/include/asm-x86/elf.h b/include/asm-x86/elf.h index 8f232dc..7be4733 100644 --- a/include/asm-x86/elf.h +++ b/include/asm-x86/elf.h @@ -83,9 +83,9 @@ extern unsigned int vdso_enabled; (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486)) #include +#include #ifdef CONFIG_X86_32 -#include /* for savesegment */ #include #define elf_check_arch(x) elf_check_arch_ia32(x) diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h index 3dc223d..6d8966f 100644 --- a/include/asm-x86/paravirt.h +++ b/include/asm-x86/paravirt.h @@ -115,6 +115,9 @@ struct pv_cpu_ops { void (*set_ldt)(const void *desc, unsigned entries); unsigned long (*store_tr)(void); void (*load_tls)(struct thread_struct *t, unsigned int cpu); +#ifdef CONFIG_X86_64 + void (*load_gs_index)(unsigned int idx); +#endif void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum, const void *desc); void (*write_gdt_entry)(struct desc_struct *, @@ -845,6 +848,13 @@ static inline void load_TLS(struct thread_struct *t, unsigned cpu) PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu); } +#ifdef CONFIG_X86_64 +static inline void load_gs_index(unsigned int gs) +{ + PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs); +} +#endif + static inline void write_ldt_entry(struct desc_struct *dt, int entry, const void *desc) { diff --git a/include/asm-x86/system.h b/include/asm-x86/system.h index f686aa6..c4946c5 100644 --- a/include/asm-x86/system.h +++ b/include/asm-x86/system.h @@ -136,7 +136,7 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t" \ #define set_base(ldt, base) _set_base(((char *)&(ldt)) , (base)) #define set_limit(ldt, limit) _set_limit(((char *)&(ldt)) , ((limit)-1)) -extern void load_gs_index(unsigned); +extern void native_load_gs_index(unsigned); /* * Load a segment. Fall back on loading the zero @@ -282,6 +282,7 @@ static inline void native_wbinvd(void) #ifdef CONFIG_X86_64 #define read_cr8() (native_read_cr8()) #define write_cr8(x) (native_write_cr8(x)) +#define load_gs_index native_load_gs_index #endif /* Clear the 'TS' bit */ -- 2.7.4