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| author | Glauber de Oliveira Costa <gcosta@redhat.com> | 2008-01-30 13:32:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:32:08 +0100 |
| commit | e801f864ec7e5b149bd05337800e419f408523bb (patch) | |
| tree | cdab4ec9635926756f58398469621031a2f34ae4 | |
| parent | x86: add macro for privileged 64-bit operation (diff) | |
| download | linux-e801f864ec7e5b149bd05337800e419f408523bb.tar.xz linux-e801f864ec7e5b149bd05337800e419f408523bb.zip | |
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>
| -rw-r--r-- | arch/x86/kernel/paravirt.c | 1 | ||||
| -rw-r--r-- | include/asm-x86/paravirt.h | 9 | ||||
| -rw-r--r-- | include/asm-x86/processor.h | 8 |
3 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index 072c1a08efe6..e7c17cc4a99e 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -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, 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 { 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; \ 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, #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 */ /* |