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authorGlauber de Oliveira Costa <gcosta@redhat.com>2008-01-30 07:32:08 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:32:08 -0500
commite801f864ec7e5b149bd05337800e419f408523bb (patch)
treecdab4ec9635926756f58398469621031a2f34ae4 /include/asm-x86
parent4a8c4c4e10d1bc2c3bd80caabb6a76a66849f7e8 (diff)
x86: adds paravirt hook for swapgs
This patch adds paravirt hook for swapgs operation, which is a privileged operation in x86_64. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/paravirt.h9
-rw-r--r--include/asm-x86/processor.h8
2 files changed, 17 insertions, 0 deletions
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 7d1c126e2249..e8fbf742d425 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -127,6 +127,8 @@ struct pv_cpu_ops {
127 void (*irq_enable_syscall_ret)(void); 127 void (*irq_enable_syscall_ret)(void);
128 void (*iret)(void); 128 void (*iret)(void);
129 129
130 void (*swapgs)(void);
131
130 struct pv_lazy_ops lazy_mode; 132 struct pv_lazy_ops lazy_mode;
131}; 133};
132 134
@@ -1228,6 +1230,13 @@ static inline unsigned long __raw_local_irq_save(void)
1228 call *pv_cpu_ops+PV_CPU_read_cr0; \ 1230 call *pv_cpu_ops+PV_CPU_read_cr0; \
1229 pop %edx; pop %ecx 1231 pop %edx; pop %ecx
1230#else 1232#else
1233#define SWAPGS \
1234 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
1235 PV_SAVE_REGS; \
1236 call *pv_cpu_ops+PV_CPU_swapgs; \
1237 PV_RESTORE_REGS \
1238 )
1239
1231#define GET_CR2_INTO_RCX \ 1240#define GET_CR2_INTO_RCX \
1232 call *pv_mmu_ops+PV_MMU_read_cr2; \ 1241 call *pv_mmu_ops+PV_MMU_read_cr2; \
1233 movq %rax, %rcx; \ 1242 movq %rax, %rcx; \
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
index e6fa06fee72a..72740c6f1109 100644
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -435,6 +435,13 @@ static inline void native_load_sp0(struct tss_struct *tss,
435#endif 435#endif
436} 436}
437 437
438static inline void native_swapgs(void)
439{
440#ifdef CONFIG_X86_64
441 asm volatile("swapgs" ::: "memory");
442#endif
443}
444
438#ifdef CONFIG_PARAVIRT 445#ifdef CONFIG_PARAVIRT
439#include <asm/paravirt.h> 446#include <asm/paravirt.h>
440#else 447#else
@@ -456,6 +463,7 @@ static inline void load_sp0(struct tss_struct *tss,
456} 463}
457 464
458#define set_iopl_mask native_set_iopl_mask 465#define set_iopl_mask native_set_iopl_mask
466#define SWAPGS swapgs
459#endif /* CONFIG_PARAVIRT */ 467#endif /* CONFIG_PARAVIRT */
460 468
461/* 469/*