arch/x86/kvm/ioapic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __KVM_IO_APIC_H
   3 #define __KVM_IO_APIC_H
   4
   5 #include <linux/kvm_host.h>
   6
   7 #include <kvm/iodev.h>
   8
   9 struct kvm;
  10 struct kvm_vcpu;
  11
  12 #define IOAPIC_NUM_PINS  KVM_IOAPIC_NUM_PINS
  13 #define MAX_NR_RESERVED_IOAPIC_PINS KVM_MAX_IRQ_ROUTES
  14 #define IOAPIC_VERSION_ID 0x11  /* IOAPIC version */
  15 #define IOAPIC_EDGE_TRIG  0
  16 #define IOAPIC_LEVEL_TRIG 1
  17
  18 #define IOAPIC_DEFAULT_BASE_ADDRESS  0xfec00000
  19 #define IOAPIC_MEM_LENGTH            0x100
  20
  21 /* Direct registers. */
  22 #define IOAPIC_REG_SELECT  0x00
  23 #define IOAPIC_REG_WINDOW  0x10
  24
  25 /* Indirect registers. */
  26 #define IOAPIC_REG_APIC_ID 0x00 /* x86 IOAPIC only */
  27 #define IOAPIC_REG_VERSION 0x01
  28 #define IOAPIC_REG_ARB_ID  0x02 /* x86 IOAPIC only */
  29
  30 /*ioapic delivery mode*/
  31 #define IOAPIC_FIXED                    0x0
  32 #define IOAPIC_LOWEST_PRIORITY          0x1
  33 #define IOAPIC_PMI                      0x2
  34 #define IOAPIC_NMI                      0x4
  35 #define IOAPIC_INIT                     0x5
  36 #define IOAPIC_EXTINT                   0x7
  37
  38 #ifdef CONFIG_X86
  39 #define RTC_GSI 8
  40 #else
  41 #define RTC_GSI -1U
  42 #endif
  43
  44 struct dest_map {
  45         /* vcpu bitmap where IRQ has been sent */
  46         DECLARE_BITMAP(map, KVM_MAX_VCPU_ID);
  47
  48         /*
  49          * Vector sent to a given vcpu, only valid when
  50          * the vcpu's bit in map is set
  51          */
  52         u8 vectors[KVM_MAX_VCPU_ID];
  53 };
  54
  55
  56 struct rtc_status {
  57         int pending_eoi;
  58         struct dest_map dest_map;
  59 };
  60
  61 union kvm_ioapic_redirect_entry {
  62         u64 bits;
  63         struct {
  64                 u8 vector;
  65                 u8 delivery_mode:3;
  66                 u8 dest_mode:1;
  67                 u8 delivery_status:1;
  68                 u8 polarity:1;
  69                 u8 remote_irr:1;
  70                 u8 trig_mode:1;
  71                 u8 mask:1;
  72                 u8 reserve:7;
  73                 u8 reserved[4];
  74                 u8 dest_id;
  75         } fields;
  76 };
  77
  78 struct kvm_ioapic {
  79         u64 base_address;
  80         u32 ioregsel;
  81         u32 id;
  82         u32 irr;
  83         u32 pad;
  84         union kvm_ioapic_redirect_entry redirtbl[IOAPIC_NUM_PINS];
  85         unsigned long irq_states[IOAPIC_NUM_PINS];
  86         struct kvm_io_device dev;
  87         struct kvm *kvm;
  88         void (*ack_notifier)(void *opaque, int irq);
  89         spinlock_t lock;
  90         struct rtc_status rtc_status;
  91         struct delayed_work eoi_inject;
  92         u32 irq_eoi[IOAPIC_NUM_PINS];
  93         u32 irr_delivered;
  94 };
  95
  96 #ifdef DEBUG
  97 #define ASSERT(x)                                                       \
  98 do {                                                                    \
  99         if (!(x)) {                                                     \
 100                 printk(KERN_EMERG "assertion failed %s: %d: %s\n",      \
 101                        __FILE__, __LINE__, #x);                         \
 102                 BUG();                                                  \
 103         }                                                               \
 104 } while (0)
 105 #else
 106 #define ASSERT(x) do { } while (0)
 107 #endif
 108
 109 static inline int ioapic_in_kernel(struct kvm *kvm)
 110 {
 111         int mode = kvm->arch.irqchip_mode;
 112
 113         /* Matches smp_wmb() when setting irqchip_mode */
 114         smp_rmb();
 115         return mode == KVM_IRQCHIP_KERNEL;
 116 }
 117
 118 void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);
 119 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 120                 int short_hand, unsigned int dest, int dest_mode);
 121 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
 122 void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector,
 123                         int trigger_mode);
 124 int kvm_ioapic_init(struct kvm *kvm);
 125 void kvm_ioapic_destroy(struct kvm *kvm);
 126 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
 127                        int level, bool line_status);
 128 void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id);
 129 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 130                              struct kvm_lapic_irq *irq,
 131                              struct dest_map *dest_map);
 132 void kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
 133 void kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
 134 void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu,
 135                            ulong *ioapic_handled_vectors);
 136 void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
 137                             ulong *ioapic_handled_vectors);
 138 #endif