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x86/irqflags: Provide native versions of the local_irq_save()/restore()

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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 <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/c4c33c0d07200164a3dd8cfd6da0344f57732648.1717600736.git.thomas.lendacky@amd.com
This commit is contained in:
Tom Lendacky 2024-06-05 10:18:44 -05:00 committed by Borislav Petkov (AMD)
parent c3f38fa61a
commit b547fc2c99
1 changed files with 20 additions and 0 deletions
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20
arch/x86/include/asm/irqflags.h
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@ -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