[PATCH 36 of 36] x86_64/paravirt: Make load_gs_index() a paravirt operation

Jeremy Fitzhardinge
2008-06-25T04:49:51Z

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
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
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1080,7 +1080,7 @@

/* 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
@@ -1094,7 +1094,7 @@
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
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -331,6 +331,9 @@
.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
--- a/include/asm-x86/elf.h
+++ b/include/asm-x86/elf.h
@@ -83,9 +83,9 @@
(((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))

#include <asm/processor.h>
+#include <asm/system.h>

#ifdef CONFIG_X86_32
-#include <asm/system.h> /* for savesegment */
#include <asm/desc.h>

#define elf_check_arch(x) elf_check_arch_ia32(x)
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -115,6 +115,9 @@
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 *,
@@ -848,6 +851,13 @@
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
--- a/include/asm-x86/system.h
+++ b/include/asm-x86/system.h
@@ -140,7 +140,7 @@
#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
@@ -286,6 +286,7 @@
#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 */