27 lines
947 B
Diff
27 lines
947 B
Diff
From: Marcelo Tosatti <mtosatti@redhat.com>
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Date: Wed, 8 Apr 2015 20:33:25 -0300
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Subject: KVM: lapic: mark LAPIC timer handler as irqsafe
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.9-rt7.tar.xz
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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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--- a/arch/x86/kvm/lapic.c
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+++ b/arch/x86/kvm/lapic.c
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@@ -2062,6 +2062,7 @@ int kvm_create_lapic(struct kvm_vcpu *vc
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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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