The following commit has been merged into the x86/sev branch of tip:
Commit-ID: b547fc2c9927a95808ef93d7fbd5dd70679fb501
Gitweb: https://git.kernel.org/tip/b547fc2c9927a95808ef93d7fbd5dd70679fb501
Author: Tom Lendacky <thomas.lendacky@xxxxxxx>
AuthorDate: Wed, 05 Jun 2024 10:18:44 -05:00
Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Tue, 11 Jun 2024 07:22:46 +02:00
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 <thomas.lendacky@xxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Link: https://lore.kernel.org/r/c4c33c0d07200164a3dd8cfd6da0344f57732648.1717600736.git.thomas.lendacky@xxxxxxx
---
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 8c5ae64..cf7fc2b 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
|