arch/x86/kvm/lapic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __KVM_X86_LAPIC_H
   3 #define __KVM_X86_LAPIC_H
   4
   5 #include <kvm/iodev.h>
   6
   7 #include <linux/kvm_host.h>
   8
   9 #define KVM_APIC_INIT           0
  10 #define KVM_APIC_SIPI           1
  11 #define KVM_APIC_LVT_NUM        6
  12
  13 #define KVM_APIC_SHORT_MASK     0xc0000
  14 #define KVM_APIC_DEST_MASK      0x800
  15
  16 #define APIC_BUS_CYCLE_NS       1
  17 #define APIC_BUS_FREQUENCY      (1000000000ULL / APIC_BUS_CYCLE_NS)
  18
  19 enum lapic_mode {
  20         LAPIC_MODE_DISABLED = 0,
  21         LAPIC_MODE_INVALID = X2APIC_ENABLE,
  22         LAPIC_MODE_XAPIC = MSR_IA32_APICBASE_ENABLE,
  23         LAPIC_MODE_X2APIC = MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE,
  24 };
  25
  26 struct kvm_timer {
  27         struct hrtimer timer;
  28         s64 period;                             /* unit: ns */
  29         ktime_t target_expiration;
  30         u32 timer_mode;
  31         u32 timer_mode_mask;
  32         u64 tscdeadline;
  33         u64 expired_tscdeadline;
  34         atomic_t pending;                       /* accumulated triggered timers */
  35         bool hv_timer_in_use;
  36 };
  37
  38 struct kvm_lapic {
  39         unsigned long base_address;
  40         struct kvm_io_device dev;
  41         struct kvm_timer lapic_timer;
  42         u32 divide_count;
  43         struct kvm_vcpu *vcpu;
  44         bool sw_enabled;
  45         bool irr_pending;
  46         bool lvt0_in_nmi_mode;
  47         /* Number of bits set in ISR. */
  48         s16 isr_count;
  49         /* The highest vector set in ISR; if -1 - invalid, must scan ISR. */
  50         int highest_isr_cache;
  51         /**
  52          * APIC register page.  The layout matches the register layout seen by
  53          * the guest 1:1, because it is accessed by the vmx microcode.
  54          * Note: Only one register, the TPR, is used by the microcode.
  55          */
  56         void *regs;
  57         gpa_t vapic_addr;
  58         struct gfn_to_hva_cache vapic_cache;
  59         unsigned long pending_events;
  60         unsigned int sipi_vector;
  61 };
  62
  63 struct dest_map;
  64
  65 int kvm_create_lapic(struct kvm_vcpu *vcpu);
  66 void kvm_free_lapic(struct kvm_vcpu *vcpu);
  67
  68 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu);
  69 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu);
  70 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu);
  71 void kvm_apic_accept_events(struct kvm_vcpu *vcpu);
  72 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event);
  73 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);
  74 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8);
  75 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu);
  76 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value);
  77 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu);
  78 void kvm_apic_set_version(struct kvm_vcpu *vcpu);
  79 int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val);
  80 int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
  81                        void *data);
  82 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
  83                            int short_hand, unsigned int dest, int dest_mode);
  84
  85 int __kvm_apic_update_irr(u32 *pir, void *regs);
  86 int kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir);
  87 void kvm_apic_update_ppr(struct kvm_vcpu *vcpu);
  88 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
  89                      struct dest_map *dest_map);
  90 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
  91
  92 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
  93                 struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map);
  94
  95 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
  96 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
  97 int kvm_apic_get_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s);
  98 int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s);
  99 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu);
 100 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu);
 101
 102 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);
 103 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data);
 104
 105 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);
 106 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector);
 107
 108 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);
 109 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu);
 110 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu);
 111
 112 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 113 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
 114
 115 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
 116 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
 117
 118 static inline bool kvm_hv_vapic_assist_page_enabled(struct kvm_vcpu *vcpu)
 119 {
 120         return vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE;
 121 }
 122
 123 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data);
 124 void kvm_lapic_init(void);
 125 void kvm_lapic_exit(void);
 126
 127 #define VEC_POS(v) ((v) & (32 - 1))
 128 #define REG_POS(v) (((v) >> 5) << 4)
 129
 130 static inline void kvm_lapic_set_vector(int vec, void *bitmap)
 131 {
 132         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 133 }
 134
 135 static inline void kvm_lapic_set_irr(int vec, struct kvm_lapic *apic)
 136 {
 137         kvm_lapic_set_vector(vec, apic->regs + APIC_IRR);
 138         /*
 139          * irr_pending must be true if any interrupt is pending; set it after
 140          * APIC_IRR to avoid race with apic_clear_irr
 141          */
 142         apic->irr_pending = true;
 143 }
 144
 145 static inline u32 kvm_lapic_get_reg(struct kvm_lapic *apic, int reg_off)
 146 {
 147         return *((u32 *) (apic->regs + reg_off));
 148 }
 149
 150 static inline void kvm_lapic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
 151 {
 152         *((u32 *) (apic->regs + reg_off)) = val;
 153 }
 154
 155 extern struct static_key kvm_no_apic_vcpu;
 156
 157 static inline bool lapic_in_kernel(struct kvm_vcpu *vcpu)
 158 {
 159         if (static_key_false(&kvm_no_apic_vcpu))
 160                 return vcpu->arch.apic;
 161         return true;
 162 }
 163
 164 extern struct static_key_deferred apic_hw_disabled;
 165
 166 static inline int kvm_apic_hw_enabled(struct kvm_lapic *apic)
 167 {
 168         if (static_key_false(&apic_hw_disabled.key))
 169                 return apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
 170         return MSR_IA32_APICBASE_ENABLE;
 171 }
 172
 173 extern struct static_key_deferred apic_sw_disabled;
 174
 175 static inline bool kvm_apic_sw_enabled(struct kvm_lapic *apic)
 176 {
 177         if (static_key_false(&apic_sw_disabled.key))
 178                 return apic->sw_enabled;
 179         return true;
 180 }
 181
 182 static inline bool kvm_apic_present(struct kvm_vcpu *vcpu)
 183 {
 184         return lapic_in_kernel(vcpu) && kvm_apic_hw_enabled(vcpu->arch.apic);
 185 }
 186
 187 static inline int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
 188 {
 189         return kvm_apic_present(vcpu) && kvm_apic_sw_enabled(vcpu->arch.apic);
 190 }
 191
 192 static inline int apic_x2apic_mode(struct kvm_lapic *apic)
 193 {
 194         return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
 195 }
 196
 197 static inline bool kvm_vcpu_apicv_active(struct kvm_vcpu *vcpu)
 198 {
 199         return vcpu->arch.apic && vcpu->arch.apicv_active;
 200 }
 201
 202 static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
 203 {
 204         return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events;
 205 }
 206
 207 static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq)
 208 {
 209         return (irq->delivery_mode == APIC_DM_LOWEST ||
 210                         irq->msi_redir_hint);
 211 }
 212
 213 static inline int kvm_lapic_latched_init(struct kvm_vcpu *vcpu)
 214 {
 215         return lapic_in_kernel(vcpu) && test_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
 216 }
 217
 218 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
 219
 220 void wait_lapic_expire(struct kvm_vcpu *vcpu);
 221
 222 bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
 223                         struct kvm_vcpu **dest_vcpu);
 224 int kvm_vector_to_index(u32 vector, u32 dest_vcpus,
 225                         const unsigned long *bitmap, u32 bitmap_size);
 226 void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu *vcpu);
 227 void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu *vcpu);
 228 void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu);
 229 bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu);
 230 void kvm_lapic_restart_hv_timer(struct kvm_vcpu *vcpu);
 231
 232 static inline enum lapic_mode kvm_apic_mode(u64 apic_base)
 233 {
 234         return apic_base & (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE);
 235 }
 236
 237 #endif