b6958ce44a
By sleeping in the kernel when hlt is executed, we simplify the in-kernel guest interrupt path considerably. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* irq.c: API for in kernel interrupt controller
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* Copyright (c) 2007, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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* Authors:
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* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
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*
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*/
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#include <linux/module.h>
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#include "kvm.h"
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#include "irq.h"
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/*
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* check if there is pending interrupt without
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* intack.
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*/
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int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
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{
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struct kvm_pic *s;
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if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
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s = pic_irqchip(v->kvm); /* PIC */
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return s->output;
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}
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return 1;
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}
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EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
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/*
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* Read pending interrupt vector and intack.
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*/
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int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
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{
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struct kvm_pic *s;
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int vector;
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vector = kvm_get_apic_interrupt(v); /* APIC */
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if (vector == -1) {
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s = pic_irqchip(v->kvm);
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s->output = 0; /* PIC */
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vector = kvm_pic_read_irq(s);
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}
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return vector;
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}
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EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
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static void vcpu_kick_intr(void *info)
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{
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#ifdef DEBUG
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
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printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
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#endif
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}
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void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
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{
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int ipi_pcpu = vcpu->cpu;
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if (waitqueue_active(&vcpu->wq)) {
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wake_up_interruptible(&vcpu->wq);
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++vcpu->stat.halt_wakeup;
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}
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if (vcpu->guest_mode)
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smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
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}
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