Commit b547fc2c authored by Tom Lendacky's avatar Tom Lendacky Committed by Borislav Petkov (AMD)
Browse files

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: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/c4c33c0d07200164a3dd8cfd6da0344f57732648.1717600736.git.thomas.lendacky@amd.com
parent c3f38fa6

arch/x86/include/asm/irqflags.h

+20 −0
Original line number Diff line number Diff line
@@ -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