From: Nicholas Piggin <npiggin@gmail.com>
Date: Wed, 14 Sep 2016 03:01:21 +0000 (+1000)
Subject: powerpc/64: Replay hypervisor maintenance interrupt first
X-Git-Tag: Ubuntu-4.9.0-1.2~714^2~125
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=e0e0d6b7390b61feb06350ef4a9594bcf84ad204;hp=7de3b27bac47da9de08409df1d69664acbb72197;p=mirror_ubuntu-zesty-kernel.git

powerpc/64: Replay hypervisor maintenance interrupt first

The HMI (Hypervisor Maintenance Interrupt) is defined by the
architecture to be higher priority than other maskable interrupts, so
replay it first, as a best-effort to replay according to hardware
priorities.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 9594ac8e7090..471f65ad1b9b 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -156,6 +156,15 @@ notrace unsigned int __check_irq_replay(void)
 		lv1_get_version_info(&tmp, &tmp2);
 	}
 
+	/*
+	 * Check if an hypervisor Maintenance interrupt happened.
+	 * This is a higher priority interrupt than the others, so
+	 * replay it first.
+	 */
+	local_paca->irq_happened &= ~PACA_IRQ_HMI;
+	if (happened & PACA_IRQ_HMI)
+		return 0xe60;
+
 	/*
 	 * We may have missed a decrementer interrupt. We check the
 	 * decrementer itself rather than the paca irq_happened field
@@ -191,11 +200,6 @@ notrace unsigned int __check_irq_replay(void)
 	}
 #endif /* CONFIG_PPC_BOOK3E */
 
-	/* Check if an hypervisor Maintenance interrupt happened */
-	local_paca->irq_happened &= ~PACA_IRQ_HMI;
-	if (happened & PACA_IRQ_HMI)
-		return 0xe60;
-
 	/* There should be nothing left ! */
 	BUG_ON(local_paca->irq_happened != 0);