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Linux/arch/x86/kvm/irq.c

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  1 /*
  2  * irq.c: API for in kernel interrupt controller
  3  * Copyright (c) 2007, Intel Corporation.
  4  * Copyright 2009 Red Hat, Inc. and/or its affiliates.
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms and conditions of the GNU General Public License,
  8  * version 2, as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14  *
 15  * You should have received a copy of the GNU General Public License along with
 16  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 17  * Place - Suite 330, Boston, MA 02111-1307 USA.
 18  * Authors:
 19  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
 20  *
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/kvm_host.h>
 25 
 26 #include "irq.h"
 27 #include "i8254.h"
 28 #include "x86.h"
 29 
 30 /*
 31  * check if there are pending timer events
 32  * to be processed.
 33  */
 34 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 35 {
 36         return apic_has_pending_timer(vcpu);
 37 }
 38 EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
 39 
 40 /*
 41  * check if there is pending interrupt without
 42  * intack.
 43  */
 44 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
 45 {
 46         struct kvm_pic *s;
 47 
 48         if (!irqchip_in_kernel(v->kvm))
 49                 return v->arch.interrupt.pending;
 50 
 51         if (kvm_apic_has_interrupt(v) == -1) {  /* LAPIC */
 52                 if (kvm_apic_accept_pic_intr(v)) {
 53                         s = pic_irqchip(v->kvm);        /* PIC */
 54                         return s->output;
 55                 } else
 56                         return 0;
 57         }
 58         return 1;
 59 }
 60 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
 61 
 62 /*
 63  * Read pending interrupt vector and intack.
 64  */
 65 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
 66 {
 67         struct kvm_pic *s;
 68         int vector;
 69 
 70         if (!irqchip_in_kernel(v->kvm))
 71                 return v->arch.interrupt.nr;
 72 
 73         vector = kvm_get_apic_interrupt(v);     /* APIC */
 74         if (vector == -1) {
 75                 if (kvm_apic_accept_pic_intr(v)) {
 76                         s = pic_irqchip(v->kvm);
 77                         s->output = 0;          /* PIC */
 78                         vector = kvm_pic_read_irq(v->kvm);
 79                 }
 80         }
 81         return vector;
 82 }
 83 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
 84 
 85 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
 86 {
 87         kvm_inject_apic_timer_irqs(vcpu);
 88         /* TODO: PIT, RTC etc. */
 89 }
 90 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
 91 
 92 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
 93 {
 94         __kvm_migrate_apic_timer(vcpu);
 95         __kvm_migrate_pit_timer(vcpu);
 96 }
 97 

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