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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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1
arch/x86/kernel/paravirt.c
View File

@ -390,6 +390,7 @@ struct pv_cpu_ops pv_cpu_ops = {
.irq_enable_syscall_ret = native_irq_enable_syscall_ret,
.iret = native_iret,
.swapgs = native_swapgs,
.set_iopl_mask = native_set_iopl_mask,
.io_delay = native_io_delay,

9
include/asm-x86/paravirt.h
View File

@ -127,6 +127,8 @@ struct pv_cpu_ops {
void (*irq_enable_syscall_ret)(void);
void (*iret)(void);
void (*swapgs)(void);
struct pv_lazy_ops lazy_mode;
};
@ -1228,6 +1230,13 @@ static inline unsigned long __raw_local_irq_save(void)
call *pv_cpu_ops+PV_CPU_read_cr0; \
pop %edx; pop %ecx
#else
#define SWAPGS \
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
PV_SAVE_REGS; \
call *pv_cpu_ops+PV_CPU_swapgs; \
PV_RESTORE_REGS \
)
#define GET_CR2_INTO_RCX \
call *pv_mmu_ops+PV_MMU_read_cr2; \
movq %rax, %rcx; \

8
include/asm-x86/processor.h
View File

@ -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 */
/*