diff options
Diffstat (limited to 'arch/x86/include/asm/irqflags.h')
| -rw-r--r-- | arch/x86/include/asm/irqflags.h | 46 |
1 files changed, 14 insertions, 32 deletions
diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h index 2dfc8d380dab..144d70ea4393 100644 --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -35,15 +35,6 @@ extern __always_inline unsigned long native_save_fl(void) return flags; } -extern inline void native_restore_fl(unsigned long flags); -extern inline void native_restore_fl(unsigned long flags) -{ - asm volatile("push %0 ; popf" - : /* no output */ - :"g" (flags) - :"memory", "cc"); -} - static __always_inline void native_irq_disable(void) { asm volatile("cli": : :"memory"); @@ -79,11 +70,6 @@ static __always_inline unsigned long arch_local_save_flags(void) return native_save_fl(); } -static __always_inline void arch_local_irq_restore(unsigned long flags) -{ - native_restore_fl(flags); -} - static __always_inline void arch_local_irq_disable(void) { native_irq_disable(); @@ -131,25 +117,7 @@ static __always_inline unsigned long arch_local_irq_save(void) #define SAVE_FLAGS(x) pushfq; popq %rax #endif -#define SWAPGS swapgs -/* - * Currently paravirt can't handle swapgs nicely when we - * don't have a stack we can rely on (such as a user space - * stack). So we either find a way around these or just fault - * and emulate if a guest tries to call swapgs directly. - * - * Either way, this is a good way to document that we don't - * have a reliable stack. x86_64 only. - */ -#define SWAPGS_UNSAFE_STACK swapgs - #define INTERRUPT_RETURN jmp native_iret -#define USERGS_SYSRET64 \ - swapgs; \ - sysretq; -#define USERGS_SYSRET32 \ - swapgs; \ - sysretl #else #define INTERRUPT_RETURN iret @@ -170,6 +138,20 @@ static __always_inline int arch_irqs_disabled(void) return arch_irqs_disabled_flags(flags); } + +static __always_inline void arch_local_irq_restore(unsigned long flags) +{ + if (!arch_irqs_disabled_flags(flags)) + arch_local_irq_enable(); +} +#else +#ifdef CONFIG_X86_64 +#ifdef CONFIG_XEN_PV +#define SWAPGS ALTERNATIVE "swapgs", "", X86_FEATURE_XENPV +#else +#define SWAPGS swapgs +#endif +#endif #endif /* !__ASSEMBLY__ */ #endif |