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x86: adds paravirt hook for swapgs

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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>
This commit is contained in:
Glauber de Oliveira Costa
2008-01-30 13:32:08 +01:00
committed by Ingo Molnar
parent 4a8c4c4e10
commit e801f864ec
3 changed files with 18 additions and 0 deletions
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8
include/asm-x86/processor.h
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@@ -435,6 +435,13 @@ static inline void native_load_sp0(struct tss_struct *tss,
#endif
}
static inline void native_swapgs(void)
{
#ifdef CONFIG_X86_64
asm volatile("swapgs" ::: "memory");
#endif
}
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
@@ -456,6 +463,7 @@ static inline void load_sp0(struct tss_struct *tss,
}
#define set_iopl_mask native_set_iopl_mask
#define SWAPGS swapgs
#endif /* CONFIG_PARAVIRT */
/*