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kernel/linux-imx6_3.14.28/arch/x86/kvm/irq.c 2.96 KB
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6b13f685e   김민수   BSP 최초 추가 
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  /*
   * irq.c: API for in kernel interrupt controller
   * Copyright (c) 2007, Intel Corporation.
   * Copyright 2009 Red Hat, Inc. and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
   * Place - Suite 330, Boston, MA 02111-1307 USA.
   * Authors:
   *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
   *
   */
  
  #include <linux/module.h>
  #include <linux/kvm_host.h>
  
  #include "irq.h"
  #include "i8254.h"
  #include "x86.h"
  
  /*
   * check if there are pending timer events
   * to be processed.
   */
  int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
  {
  	return apic_has_pending_timer(vcpu);
  }
  EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
  
  /*
   * check if there is pending interrupt from
   * non-APIC source without intack.
   */
  static int kvm_cpu_has_extint(struct kvm_vcpu *v)
  {
  	if (kvm_apic_accept_pic_intr(v))
  		return pic_irqchip(v->kvm)->output;	/* PIC */
  	else
  		return 0;
  }
  
  /*
   * check if there is injectable interrupt:
   * when virtual interrupt delivery enabled,
   * interrupt from apic will handled by hardware,
   * we don't need to check it here.
   */
  int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
  {
  	if (!irqchip_in_kernel(v->kvm))
  		return v->arch.interrupt.pending;
  
  	if (kvm_cpu_has_extint(v))
  		return 1;
  
  	if (kvm_apic_vid_enabled(v->kvm))
  		return 0;
  
  	return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
  }
  
  /*
   * check if there is pending interrupt without
   * intack.
   */
  int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  {
  	if (!irqchip_in_kernel(v->kvm))
  		return v->arch.interrupt.pending;
  
  	if (kvm_cpu_has_extint(v))
  		return 1;
  
  	return kvm_apic_has_interrupt(v) != -1;	/* LAPIC */
  }
  EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
  
  /*
   * Read pending interrupt(from non-APIC source)
   * vector and intack.
   */
  static int kvm_cpu_get_extint(struct kvm_vcpu *v)
  {
  	if (kvm_cpu_has_extint(v))
  		return kvm_pic_read_irq(v->kvm); /* PIC */
  	return -1;
  }
  
  /*
   * Read pending interrupt vector and intack.
   */
  int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
  {
  	int vector;
  
  	if (!irqchip_in_kernel(v->kvm))
  		return v->arch.interrupt.nr;
  
  	vector = kvm_cpu_get_extint(v);
  
  	if (vector != -1)
  		return vector;			/* PIC */
  
  	return kvm_get_apic_interrupt(v);	/* APIC */
  }
  
  void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
  {
  	kvm_inject_apic_timer_irqs(vcpu);
  	/* TODO: PIT, RTC etc. */
  }
  EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
  
  void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
  {
  	__kvm_migrate_apic_timer(vcpu);
  	__kvm_migrate_pit_timer(vcpu);
  }