arch/x86/kvm/irq.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * irq.h: in kernel interrupt controller related definitions
   4  * Copyright (c) 2007, Intel Corporation.
   5  *
   6  * Authors:
   7  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
   8  */
   9
  10 #ifndef __IRQ_H
  11 #define __IRQ_H
  12
  13 #include <linux/mm_types.h>
  14 #include <linux/hrtimer.h>
  15 #include <linux/kvm_host.h>
  16 #include <linux/spinlock.h>
  17
  18 #include <kvm/iodev.h>
  19 #include "ioapic.h"
  20 #include "lapic.h"
  21
  22 #define PIC_NUM_PINS 16
  23 #define SELECT_PIC(irq) \
  24         ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
  25
  26 struct kvm;
  27 struct kvm_vcpu;
  28
  29 struct kvm_kpic_state {
  30         u8 last_irr;    /* edge detection */
  31         u8 irr;         /* interrupt request register */
  32         u8 imr;         /* interrupt mask register */
  33         u8 isr;         /* interrupt service register */
  34         u8 priority_add;        /* highest irq priority */
  35         u8 irq_base;
  36         u8 read_reg_select;
  37         u8 poll;
  38         u8 special_mask;
  39         u8 init_state;
  40         u8 auto_eoi;
  41         u8 rotate_on_auto_eoi;
  42         u8 special_fully_nested_mode;
  43         u8 init4;               /* true if 4 byte init */
  44         u8 elcr;                /* PIIX edge/trigger selection */
  45         u8 elcr_mask;
  46         u8 isr_ack;     /* interrupt ack detection */
  47         struct kvm_pic *pics_state;
  48 };
  49
  50 struct kvm_pic {
  51         spinlock_t lock;
  52         bool wakeup_needed;
  53         unsigned pending_acks;
  54         struct kvm *kvm;
  55         struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
  56         int output;             /* intr from master PIC */
  57         struct kvm_io_device dev_master;
  58         struct kvm_io_device dev_slave;
  59         struct kvm_io_device dev_eclr;
  60         void (*ack_notifier)(void *opaque, int irq);
  61         unsigned long irq_states[PIC_NUM_PINS];
  62 };
  63
  64 int kvm_pic_init(struct kvm *kvm);
  65 void kvm_pic_destroy(struct kvm *kvm);
  66 int kvm_pic_read_irq(struct kvm *kvm);
  67 void kvm_pic_update_irq(struct kvm_pic *s);
  68
  69 static inline int pic_in_kernel(struct kvm *kvm)
  70 {
  71         int mode = kvm->arch.irqchip_mode;
  72
  73         /* Matches smp_wmb() when setting irqchip_mode */
  74         smp_rmb();
  75         return mode == KVM_IRQCHIP_KERNEL;
  76 }
  77
  78 static inline int irqchip_split(struct kvm *kvm)
  79 {
  80         int mode = kvm->arch.irqchip_mode;
  81
  82         /* Matches smp_wmb() when setting irqchip_mode */
  83         smp_rmb();
  84         return mode == KVM_IRQCHIP_SPLIT;
  85 }
  86
  87 static inline int irqchip_kernel(struct kvm *kvm)
  88 {
  89         int mode = kvm->arch.irqchip_mode;
  90
  91         /* Matches smp_wmb() when setting irqchip_mode */
  92         smp_rmb();
  93         return mode == KVM_IRQCHIP_KERNEL;
  94 }
  95
  96 static inline int irqchip_in_kernel(struct kvm *kvm)
  97 {
  98         int mode = kvm->arch.irqchip_mode;
  99
 100         /* Matches smp_wmb() when setting irqchip_mode */
 101         smp_rmb();
 102         return mode != KVM_IRQCHIP_NONE;
 103 }
 104
 105 bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
 106 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
 107 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
 108 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
 109 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
 110 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
 111 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
 112
 113 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
 114
 115 int kvm_setup_default_irq_routing(struct kvm *kvm);
 116 int kvm_setup_empty_irq_routing(struct kvm *kvm);
 117
 118 #endif