1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2015, 2016 ARM Ltd. 4 */ 5 #ifndef __KVM_ARM_VGIC_H 6 #define __KVM_ARM_VGIC_H 7 8 #include <linux/kernel.h> 9 #include <linux/kvm.h> 10 #include <linux/irqreturn.h> 11 #include <linux/spinlock.h> 12 #include <linux/static_key.h> 13 #include <linux/types.h> 14 #include <kvm/iodev.h> 15 #include <linux/list.h> 16 #include <linux/jump_label.h> 17 18 #include <linux/irqchip/arm-gic-v4.h> 19 20 #define VGIC_V3_MAX_CPUS 512 21 #define VGIC_V2_MAX_CPUS 8 22 #define VGIC_NR_IRQS_LEGACY 256 23 #define VGIC_NR_SGIS 16 24 #define VGIC_NR_PPIS 16 25 #define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS) 26 #define VGIC_MAX_PRIVATE (VGIC_NR_PRIVATE_IRQS - 1) 27 #define VGIC_MAX_SPI 1019 28 #define VGIC_MAX_RESERVED 1023 29 #define VGIC_MIN_LPI 8192 30 #define KVM_IRQCHIP_NUM_PINS (1020 - 32) 31 32 #define irq_is_ppi(irq) ((irq) >= VGIC_NR_SGIS && (irq) < VGIC_NR_PRIVATE_IRQS) 33 #define irq_is_spi(irq) ((irq) >= VGIC_NR_PRIVATE_IRQS && \ 34 (irq) <= VGIC_MAX_SPI) 35 36 enum vgic_type { 37 VGIC_V2, /* Good ol' GICv2 */ 38 VGIC_V3, /* New fancy GICv3 */ 39 }; 40 41 /* same for all guests, as depending only on the _host's_ GIC model */ 42 struct vgic_global { 43 /* type of the host GIC */ 44 enum vgic_type type; 45 46 /* Physical address of vgic virtual cpu interface */ 47 phys_addr_t vcpu_base; 48 49 /* GICV mapping, kernel VA */ 50 void __iomem *vcpu_base_va; 51 /* GICV mapping, HYP VA */ 52 void __iomem *vcpu_hyp_va; 53 54 /* virtual control interface mapping, kernel VA */ 55 void __iomem *vctrl_base; 56 /* virtual control interface mapping, HYP VA */ 57 void __iomem *vctrl_hyp; 58 59 /* Number of implemented list registers */ 60 int nr_lr; 61 62 /* Maintenance IRQ number */ 63 unsigned int maint_irq; 64 65 /* maximum number of VCPUs allowed (GICv2 limits us to 8) */ 66 int max_gic_vcpus; 67 68 /* Only needed for the legacy KVM_CREATE_IRQCHIP */ 69 bool can_emulate_gicv2; 70 71 /* Hardware has GICv4? */ 72 bool has_gicv4; 73 bool has_gicv4_1; 74 75 /* GIC system register CPU interface */ 76 struct static_key_false gicv3_cpuif; 77 78 u32 ich_vtr_el2; 79 }; 80 81 extern struct vgic_global kvm_vgic_global_state; 82 83 #define VGIC_V2_MAX_LRS (1 << 6) 84 #define VGIC_V3_MAX_LRS 16 85 #define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr) 86 87 enum vgic_irq_config { 88 VGIC_CONFIG_EDGE = 0, 89 VGIC_CONFIG_LEVEL 90 }; 91 92 struct vgic_irq { 93 raw_spinlock_t irq_lock; /* Protects the content of the struct */ 94 struct list_head lpi_list; /* Used to link all LPIs together */ 95 struct list_head ap_list; 96 97 struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU 98 * SPIs and LPIs: The VCPU whose ap_list 99 * this is queued on. 100 */ 101 102 struct kvm_vcpu *target_vcpu; /* The VCPU that this interrupt should 103 * be sent to, as a result of the 104 * targets reg (v2) or the 105 * affinity reg (v3). 106 */ 107 108 u32 intid; /* Guest visible INTID */ 109 bool line_level; /* Level only */ 110 bool pending_latch; /* The pending latch state used to calculate 111 * the pending state for both level 112 * and edge triggered IRQs. */ 113 bool active; /* not used for LPIs */ 114 bool enabled; 115 bool hw; /* Tied to HW IRQ */ 116 struct kref refcount; /* Used for LPIs */ 117 u32 hwintid; /* HW INTID number */ 118 unsigned int host_irq; /* linux irq corresponding to hwintid */ 119 union { 120 u8 targets; /* GICv2 target VCPUs mask */ 121 u32 mpidr; /* GICv3 target VCPU */ 122 }; 123 u8 source; /* GICv2 SGIs only */ 124 u8 active_source; /* GICv2 SGIs only */ 125 u8 priority; 126 u8 group; /* 0 == group 0, 1 == group 1 */ 127 enum vgic_irq_config config; /* Level or edge */ 128 129 /* 130 * Callback function pointer to in-kernel devices that can tell us the 131 * state of the input level of mapped level-triggered IRQ faster than 132 * peaking into the physical GIC. 133 * 134 * Always called in non-preemptible section and the functions can use 135 * kvm_arm_get_running_vcpu() to get the vcpu pointer for private 136 * IRQs. 137 */ 138 bool (*get_input_level)(int vintid); 139 140 void *owner; /* Opaque pointer to reserve an interrupt 141 for in-kernel devices. */ 142 }; 143 144 struct vgic_register_region; 145 struct vgic_its; 146 147 enum iodev_type { 148 IODEV_CPUIF, 149 IODEV_DIST, 150 IODEV_REDIST, 151 IODEV_ITS 152 }; 153 154 struct vgic_io_device { 155 gpa_t base_addr; 156 union { 157 struct kvm_vcpu *redist_vcpu; 158 struct vgic_its *its; 159 }; 160 const struct vgic_register_region *regions; 161 enum iodev_type iodev_type; 162 int nr_regions; 163 struct kvm_io_device dev; 164 }; 165 166 struct vgic_its { 167 /* The base address of the ITS control register frame */ 168 gpa_t vgic_its_base; 169 170 bool enabled; 171 struct vgic_io_device iodev; 172 struct kvm_device *dev; 173 174 /* These registers correspond to GITS_BASER{0,1} */ 175 u64 baser_device_table; 176 u64 baser_coll_table; 177 178 /* Protects the command queue */ 179 struct mutex cmd_lock; 180 u64 cbaser; 181 u32 creadr; 182 u32 cwriter; 183 184 /* migration ABI revision in use */ 185 u32 abi_rev; 186 187 /* Protects the device and collection lists */ 188 struct mutex its_lock; 189 struct list_head device_list; 190 struct list_head collection_list; 191 }; 192 193 struct vgic_state_iter; 194 195 struct vgic_redist_region { 196 u32 index; 197 gpa_t base; 198 u32 count; /* number of redistributors or 0 if single region */ 199 u32 free_index; /* index of the next free redistributor */ 200 struct list_head list; 201 }; 202 203 struct vgic_dist { 204 bool in_kernel; 205 bool ready; 206 bool initialized; 207 208 /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */ 209 u32 vgic_model; 210 211 /* Implementation revision as reported in the GICD_IIDR */ 212 u32 implementation_rev; 213 214 /* Userspace can write to GICv2 IGROUPR */ 215 bool v2_groups_user_writable; 216 217 /* Do injected MSIs require an additional device ID? */ 218 bool msis_require_devid; 219 220 int nr_spis; 221 222 /* base addresses in guest physical address space: */ 223 gpa_t vgic_dist_base; /* distributor */ 224 union { 225 /* either a GICv2 CPU interface */ 226 gpa_t vgic_cpu_base; 227 /* or a number of GICv3 redistributor regions */ 228 struct list_head rd_regions; 229 }; 230 231 /* distributor enabled */ 232 bool enabled; 233 234 /* Wants SGIs without active state */ 235 bool nassgireq; 236 237 struct vgic_irq *spis; 238 239 struct vgic_io_device dist_iodev; 240 241 bool has_its; 242 243 /* 244 * Contains the attributes and gpa of the LPI configuration table. 245 * Since we report GICR_TYPER.CommonLPIAff as 0b00, we can share 246 * one address across all redistributors. 247 * GICv3 spec: IHI 0069E 6.1.1 "LPI Configuration tables" 248 */ 249 u64 propbaser; 250 251 /* Protects the lpi_list and the count value below. */ 252 raw_spinlock_t lpi_list_lock; 253 struct list_head lpi_list_head; 254 int lpi_list_count; 255 256 /* LPI translation cache */ 257 struct list_head lpi_translation_cache; 258 259 /* used by vgic-debug */ 260 struct vgic_state_iter *iter; 261 262 /* 263 * GICv4 ITS per-VM data, containing the IRQ domain, the VPE 264 * array, the property table pointer as well as allocation 265 * data. This essentially ties the Linux IRQ core and ITS 266 * together, and avoids leaking KVM's data structures anywhere 267 * else. 268 */ 269 struct its_vm its_vm; 270 }; 271 272 struct vgic_v2_cpu_if { 273 u32 vgic_hcr; 274 u32 vgic_vmcr; 275 u32 vgic_apr; 276 u32 vgic_lr[VGIC_V2_MAX_LRS]; 277 278 unsigned int used_lrs; 279 }; 280 281 struct vgic_v3_cpu_if { 282 u32 vgic_hcr; 283 u32 vgic_vmcr; 284 u32 vgic_sre; /* Restored only, change ignored */ 285 u32 vgic_ap0r[4]; 286 u32 vgic_ap1r[4]; 287 u64 vgic_lr[VGIC_V3_MAX_LRS]; 288 289 /* 290 * GICv4 ITS per-VPE data, containing the doorbell IRQ, the 291 * pending table pointer, the its_vm pointer and a few other 292 * HW specific things. As for the its_vm structure, this is 293 * linking the Linux IRQ subsystem and the ITS together. 294 */ 295 struct its_vpe its_vpe; 296 297 unsigned int used_lrs; 298 }; 299 300 struct vgic_cpu { 301 /* CPU vif control registers for world switch */ 302 union { 303 struct vgic_v2_cpu_if vgic_v2; 304 struct vgic_v3_cpu_if vgic_v3; 305 }; 306 307 struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS]; 308 309 raw_spinlock_t ap_list_lock; /* Protects the ap_list */ 310 311 /* 312 * List of IRQs that this VCPU should consider because they are either 313 * Active or Pending (hence the name; AP list), or because they recently 314 * were one of the two and need to be migrated off this list to another 315 * VCPU. 316 */ 317 struct list_head ap_list_head; 318 319 /* 320 * Members below are used with GICv3 emulation only and represent 321 * parts of the redistributor. 322 */ 323 struct vgic_io_device rd_iodev; 324 struct vgic_redist_region *rdreg; 325 326 /* Contains the attributes and gpa of the LPI pending tables. */ 327 u64 pendbaser; 328 329 bool lpis_enabled; 330 331 /* Cache guest priority bits */ 332 u32 num_pri_bits; 333 334 /* Cache guest interrupt ID bits */ 335 u32 num_id_bits; 336 }; 337 338 extern struct static_key_false vgic_v2_cpuif_trap; 339 extern struct static_key_false vgic_v3_cpuif_trap; 340 341 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write); 342 void kvm_vgic_early_init(struct kvm *kvm); 343 int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu); 344 int kvm_vgic_create(struct kvm *kvm, u32 type); 345 void kvm_vgic_destroy(struct kvm *kvm); 346 void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu); 347 int kvm_vgic_map_resources(struct kvm *kvm); 348 int kvm_vgic_hyp_init(void); 349 void kvm_vgic_init_cpu_hardware(void); 350 351 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, 352 bool level, void *owner); 353 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq, 354 u32 vintid, bool (*get_input_level)(int vindid)); 355 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid); 356 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid); 357 358 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu); 359 360 void kvm_vgic_load(struct kvm_vcpu *vcpu); 361 void kvm_vgic_put(struct kvm_vcpu *vcpu); 362 void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu); 363 364 #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel)) 365 #define vgic_initialized(k) ((k)->arch.vgic.initialized) 366 #define vgic_ready(k) ((k)->arch.vgic.ready) 367 #define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \ 368 ((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) 369 370 bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu); 371 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu); 372 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu); 373 void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid); 374 375 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg, bool allow_group1); 376 377 /** 378 * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW 379 * 380 * The host's GIC naturally limits the maximum amount of VCPUs a guest 381 * can use. 382 */ 383 static inline int kvm_vgic_get_max_vcpus(void) 384 { 385 return kvm_vgic_global_state.max_gic_vcpus; 386 } 387 388 /** 389 * kvm_vgic_setup_default_irq_routing: 390 * Setup a default flat gsi routing table mapping all SPIs 391 */ 392 int kvm_vgic_setup_default_irq_routing(struct kvm *kvm); 393 394 int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner); 395 396 struct kvm_kernel_irq_routing_entry; 397 398 int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq, 399 struct kvm_kernel_irq_routing_entry *irq_entry); 400 401 int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq, 402 struct kvm_kernel_irq_routing_entry *irq_entry); 403 404 int vgic_v4_load(struct kvm_vcpu *vcpu); 405 int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db); 406 407 #endif /* __KVM_ARM_VGIC_H */ 408