From b547fc2c9927a95808ef93d7fbd5dd70679fb501 Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Wed, 5 Jun 2024 10:18:44 -0500 Subject: [PATCH] x86/irqflags: Provide native versions of the local_irq_save()/restore() Functions that need to disable IRQs, but are common to both early boot and post-boot execution, are unable to deal with paravirt support associated with local_irq_save() and local_irq_restore(). Create native versions of these for use in these situations. Signed-off-by: Tom Lendacky Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/c4c33c0d07200164a3dd8cfd6da0344f57732648.1717600736.git.thomas.lendacky@amd.com --- arch/x86/include/asm/irqflags.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h index 8c5ae649d2df8..cf7fc2b8e3ce1 100644 --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -54,6 +54,26 @@ static __always_inline void native_halt(void) asm volatile("hlt": : :"memory"); } +static __always_inline int native_irqs_disabled_flags(unsigned long flags) +{ + return !(flags & X86_EFLAGS_IF); +} + +static __always_inline unsigned long native_local_irq_save(void) +{ + unsigned long flags = native_save_fl(); + + native_irq_disable(); + + return flags; +} + +static __always_inline void native_local_irq_restore(unsigned long flags) +{ + if (!native_irqs_disabled_flags(flags)) + native_irq_enable(); +} + #endif #ifdef CONFIG_PARAVIRT_XXL