x86/kvm/irq.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * irq.h: in kernel interrupt controller related definitions
0004  * Copyright (c) 2007, Intel Corporation.
0005  *
0006  * Authors:
0007  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
0008  */
0009
0010 #ifndef __IRQ_H
0011 #define __IRQ_H
0012
0013 #include <linux/mm_types.h>
0014 #include <linux/hrtimer.h>
0015 #include <linux/kvm_host.h>
0016 #include <linux/spinlock.h>
0017
0018 #include <kvm/iodev.h>
0019 #include "lapic.h"
0020
0021 #define PIC_NUM_PINS 16
0022 #define SELECT_PIC(irq) \
0023     ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
0024
0025 struct kvm;
0026 struct kvm_vcpu;
0027
0028 struct kvm_kpic_state {
0029     u8 last_irr;    /* edge detection */
0030     u8 irr;     /* interrupt request register */
0031     u8 imr;     /* interrupt mask register */
0032     u8 isr;     /* interrupt service register */
0033     u8 priority_add;    /* highest irq priority */
0034     u8 irq_base;
0035     u8 read_reg_select;
0036     u8 poll;
0037     u8 special_mask;
0038     u8 init_state;
0039     u8 auto_eoi;
0040     u8 rotate_on_auto_eoi;
0041     u8 special_fully_nested_mode;
0042     u8 init4;       /* true if 4 byte init */
0043     u8 elcr;        /* PIIX edge/trigger selection */
0044     u8 elcr_mask;
0045     u8 isr_ack; /* interrupt ack detection */
0046     struct kvm_pic *pics_state;
0047 };
0048
0049 struct kvm_pic {
0050     spinlock_t lock;
0051     bool wakeup_needed;
0052     unsigned pending_acks;
0053     struct kvm *kvm;
0054     struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
0055     int output;     /* intr from master PIC */
0056     struct kvm_io_device dev_master;
0057     struct kvm_io_device dev_slave;
0058     struct kvm_io_device dev_elcr;
0059     unsigned long irq_states[PIC_NUM_PINS];
0060 };
0061
0062 int kvm_pic_init(struct kvm *kvm);
0063 void kvm_pic_destroy(struct kvm *kvm);
0064 int kvm_pic_read_irq(struct kvm *kvm);
0065 void kvm_pic_update_irq(struct kvm_pic *s);
0066
0067 static inline int irqchip_split(struct kvm *kvm)
0068 {
0069     int mode = kvm->arch.irqchip_mode;
0070
0071     /* Matches smp_wmb() when setting irqchip_mode */
0072     smp_rmb();
0073     return mode == KVM_IRQCHIP_SPLIT;
0074 }
0075
0076 static inline int irqchip_kernel(struct kvm *kvm)
0077 {
0078     int mode = kvm->arch.irqchip_mode;
0079
0080     /* Matches smp_wmb() when setting irqchip_mode */
0081     smp_rmb();
0082     return mode == KVM_IRQCHIP_KERNEL;
0083 }
0084
0085 static inline int pic_in_kernel(struct kvm *kvm)
0086 {
0087     return irqchip_kernel(kvm);
0088 }
0089
0090 static inline int irqchip_in_kernel(struct kvm *kvm)
0091 {
0092     int mode = kvm->arch.irqchip_mode;
0093
0094     /* Matches smp_wmb() when setting irqchip_mode */
0095     smp_rmb();
0096     return mode != KVM_IRQCHIP_NONE;
0097 }
0098
0099 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
0100 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
0101 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
0102 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
0103 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
0104 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
0105
0106 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
0107
0108 int kvm_setup_default_irq_routing(struct kvm *kvm);
0109 int kvm_setup_empty_irq_routing(struct kvm *kvm);
0110 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
0111                  struct kvm_lapic_irq *irq,
0112                  struct dest_map *dest_map);
0113
0114 #endif