linux-kernel - [patch 13/18] x86/apic: Add NMI

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Date:   Wed, 03 Jul 2019 12:54:44 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Nadav Amit <namit@...are.com>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Feng Tang <feng.tang@...el.com>
Subject: [patch 13/18] x86/apic: Add NMI_VECTOR wait to IPI shorthand

To support NMI shorthand broadcasts add the safe wait for ICR idle for NMI
vector delivery.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/apic/ipi.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/apic/ipi.c
+++ b/arch/x86/kernel/apic/ipi.c
@@ -30,7 +30,10 @@ void __default_send_IPI_shortcut(unsigne
 	/*
 	 * Wait for idle.
 	 */
-	__xapic_wait_icr_idle();
+	if (unlikely(vector == NMI_VECTOR))
+		safe_apic_wait_icr_idle();
+	else
+		__xapic_wait_icr_idle();
 
 	/*
 	 * No need to touch the target chip field. Also the destination