32 lines
1.0 KiB
Diff
32 lines
1.0 KiB
Diff
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From afe0c6a54e9c6e9e1b353c014f07ecc961be3d8e Mon Sep 17 00:00:00 2001
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From: Marcelo Tosatti <mtosatti@redhat.com>
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Date: Wed, 8 Apr 2015 20:33:25 -0300
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Subject: [PATCH 267/365] KVM: lapic: mark LAPIC timer handler as irqsafe
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Since lapic timer handler only wakes up a simple waitqueue,
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it can be executed from hardirq context.
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Reduces average cyclictest latency by 3us.
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Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/x86/kvm/lapic.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
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index bfed29a4c2ce..2739b2c8db0e 100644
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--- a/arch/x86/kvm/lapic.c
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+++ b/arch/x86/kvm/lapic.c
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@@ -1978,6 +1978,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
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hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
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HRTIMER_MODE_ABS_PINNED);
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apic->lapic_timer.timer.function = apic_timer_fn;
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+ apic->lapic_timer.timer.irqsafe = 1;
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/*
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* APIC is created enabled. This will prevent kvm_lapic_set_base from
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--
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2.28.0
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