linux-kernel - [PATCH 1/1] Drivers: hv: Issue explicit EOI when autoeoi is not enabled

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Date:   Tue, 28 Mar 2017 17:16:53 -0700
From:   kys@...hange.microsoft.com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        leann.ogasawara@...onical.com, marcelo.cerri@...onical.com
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/1] Drivers: hv: Issue explicit EOI when autoeoi is not enabled

From: K. Y. Srinivasan <kys@...rosoft.com>

When auto EOI is not enabled; issue an explicit EOI for hyper-v
interrupts.

Fixes: 6c248aad81c8 ("Drivers: hv: Base autoeoi enablement based on hypervisor hints")

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 arch/x86/kernel/cpu/mshyperv.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index b5375b9..04cb8d3 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -49,6 +49,9 @@ void hyperv_vector_handler(struct pt_regs *regs)
 	if (vmbus_handler)
 		vmbus_handler();
 
+	if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
+		ack_APIC_irq();
+
 	exiting_irq();
 	set_irq_regs(old_regs);
 }
-- 
1.7.1