1 /* 2 * Copyright (C) 2015, 2016 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __KVM_ARM_VGIC_H 17 #define __KVM_ARM_VGIC_H 18 19 #include <linux/kernel.h> 20 #include <linux/kvm.h> 21 #include <linux/irqreturn.h> 22 #include <linux/spinlock.h> 23 #include <linux/static_key.h> 24 #include <linux/types.h> 25 #include <kvm/iodev.h> 26 #include <linux/list.h> 27 #include <linux/jump_label.h> 28 29 #include <linux/irqchip/arm-gic-v4.h> 30 31 #define VGIC_V3_MAX_CPUS 512 32 #define VGIC_V2_MAX_CPUS 8 33 #define VGIC_NR_IRQS_LEGACY 256 34 #define VGIC_NR_SGIS 16 35 #define VGIC_NR_PPIS 16 36 #define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS) 37 #define VGIC_MAX_PRIVATE (VGIC_NR_PRIVATE_IRQS - 1) 38 #define VGIC_MAX_SPI 1019 39 #define VGIC_MAX_RESERVED 1023 40 #define VGIC_MIN_LPI 8192 41 #define KVM_IRQCHIP_NUM_PINS (1020 - 32) 42 43 #define irq_is_ppi(irq) ((irq) >= VGIC_NR_SGIS && (irq) < VGIC_NR_PRIVATE_IRQS) 44 #define irq_is_spi(irq) ((irq) >= VGIC_NR_PRIVATE_IRQS && \ 45 (irq) <= VGIC_MAX_SPI) 46 47 enum vgic_type { 48 VGIC_V2, /* Good ol' GICv2 */ 49 VGIC_V3, /* New fancy GICv3 */ 50 }; 51 52 /* same for all guests, as depending only on the _host's_ GIC model */ 53 struct vgic_global { 54 /* type of the host GIC */ 55 enum vgic_type type; 56 57 /* Physical address of vgic virtual cpu interface */ 58 phys_addr_t vcpu_base; 59 60 /* GICV mapping, kernel VA */ 61 void __iomem *vcpu_base_va; 62 /* GICV mapping, HYP VA */ 63 void __iomem *vcpu_hyp_va; 64 65 /* virtual control interface mapping, kernel VA */ 66 void __iomem *vctrl_base; 67 /* virtual control interface mapping, HYP VA */ 68 void __iomem *vctrl_hyp; 69 70 /* Number of implemented list registers */ 71 int nr_lr; 72 73 /* Maintenance IRQ number */ 74 unsigned int maint_irq; 75 76 /* maximum number of VCPUs allowed (GICv2 limits us to 8) */ 77 int max_gic_vcpus; 78 79 /* Only needed for the legacy KVM_CREATE_IRQCHIP */ 80 bool can_emulate_gicv2; 81 82 /* Hardware has GICv4? */ 83 bool has_gicv4; 84 85 /* GIC system register CPU interface */ 86 struct static_key_false gicv3_cpuif; 87 88 u32 ich_vtr_el2; 89 }; 90 91 extern struct vgic_global kvm_vgic_global_state; 92 93 #define VGIC_V2_MAX_LRS (1 << 6) 94 #define VGIC_V3_MAX_LRS 16 95 #define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr) 96 97 enum vgic_irq_config { 98 VGIC_CONFIG_EDGE = 0, 99 VGIC_CONFIG_LEVEL 100 }; 101 102 struct vgic_irq { 103 spinlock_t irq_lock; /* Protects the content of the struct */ 104 struct list_head lpi_list; /* Used to link all LPIs together */ 105 struct list_head ap_list; 106 107 struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU 108 * SPIs and LPIs: The VCPU whose ap_list 109 * this is queued on. 110 */ 111 112 struct kvm_vcpu *target_vcpu; /* The VCPU that this interrupt should 113 * be sent to, as a result of the 114 * targets reg (v2) or the 115 * affinity reg (v3). 116 */ 117 118 u32 intid; /* Guest visible INTID */ 119 bool line_level; /* Level only */ 120 bool pending_latch; /* The pending latch state used to calculate 121 * the pending state for both level 122 * and edge triggered IRQs. */ 123 bool active; /* not used for LPIs */ 124 bool enabled; 125 bool hw; /* Tied to HW IRQ */ 126 struct kref refcount; /* Used for LPIs */ 127 u32 hwintid; /* HW INTID number */ 128 unsigned int host_irq; /* linux irq corresponding to hwintid */ 129 union { 130 u8 targets; /* GICv2 target VCPUs mask */ 131 u32 mpidr; /* GICv3 target VCPU */ 132 }; 133 u8 source; /* GICv2 SGIs only */ 134 u8 active_source; /* GICv2 SGIs only */ 135 u8 priority; 136 enum vgic_irq_config config; /* Level or edge */ 137 138 /* 139 * Callback function pointer to in-kernel devices that can tell us the 140 * state of the input level of mapped level-triggered IRQ faster than 141 * peaking into the physical GIC. 142 * 143 * Always called in non-preemptible section and the functions can use 144 * kvm_arm_get_running_vcpu() to get the vcpu pointer for private 145 * IRQs. 146 */ 147 bool (*get_input_level)(int vintid); 148 149 void *owner; /* Opaque pointer to reserve an interrupt 150 for in-kernel devices. */ 151 }; 152 153 struct vgic_register_region; 154 struct vgic_its; 155 156 enum iodev_type { 157 IODEV_CPUIF, 158 IODEV_DIST, 159 IODEV_REDIST, 160 IODEV_ITS 161 }; 162 163 struct vgic_io_device { 164 gpa_t base_addr; 165 union { 166 struct kvm_vcpu *redist_vcpu; 167 struct vgic_its *its; 168 }; 169 const struct vgic_register_region *regions; 170 enum iodev_type iodev_type; 171 int nr_regions; 172 struct kvm_io_device dev; 173 }; 174 175 struct vgic_its { 176 /* The base address of the ITS control register frame */ 177 gpa_t vgic_its_base; 178 179 bool enabled; 180 struct vgic_io_device iodev; 181 struct kvm_device *dev; 182 183 /* These registers correspond to GITS_BASER{0,1} */ 184 u64 baser_device_table; 185 u64 baser_coll_table; 186 187 /* Protects the command queue */ 188 struct mutex cmd_lock; 189 u64 cbaser; 190 u32 creadr; 191 u32 cwriter; 192 193 /* migration ABI revision in use */ 194 u32 abi_rev; 195 196 /* Protects the device and collection lists */ 197 struct mutex its_lock; 198 struct list_head device_list; 199 struct list_head collection_list; 200 }; 201 202 struct vgic_state_iter; 203 204 struct vgic_redist_region { 205 u32 index; 206 gpa_t base; 207 u32 count; /* number of redistributors or 0 if single region */ 208 u32 free_index; /* index of the next free redistributor */ 209 struct list_head list; 210 }; 211 212 struct vgic_dist { 213 bool in_kernel; 214 bool ready; 215 bool initialized; 216 217 /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */ 218 u32 vgic_model; 219 220 /* Do injected MSIs require an additional device ID? */ 221 bool msis_require_devid; 222 223 int nr_spis; 224 225 /* base addresses in guest physical address space: */ 226 gpa_t vgic_dist_base; /* distributor */ 227 union { 228 /* either a GICv2 CPU interface */ 229 gpa_t vgic_cpu_base; 230 /* or a number of GICv3 redistributor regions */ 231 struct list_head rd_regions; 232 }; 233 234 /* distributor enabled */ 235 bool enabled; 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: 6.1.2 "LPI Configuration tables" 248 */ 249 u64 propbaser; 250 251 /* Protects the lpi_list and the count value below. */ 252 spinlock_t lpi_list_lock; 253 struct list_head lpi_list_head; 254 int lpi_list_count; 255 256 /* used by vgic-debug */ 257 struct vgic_state_iter *iter; 258 259 /* 260 * GICv4 ITS per-VM data, containing the IRQ domain, the VPE 261 * array, the property table pointer as well as allocation 262 * data. This essentially ties the Linux IRQ core and ITS 263 * together, and avoids leaking KVM's data structures anywhere 264 * else. 265 */ 266 struct its_vm its_vm; 267 }; 268 269 struct vgic_v2_cpu_if { 270 u32 vgic_hcr; 271 u32 vgic_vmcr; 272 u32 vgic_apr; 273 u32 vgic_lr[VGIC_V2_MAX_LRS]; 274 }; 275 276 struct vgic_v3_cpu_if { 277 u32 vgic_hcr; 278 u32 vgic_vmcr; 279 u32 vgic_sre; /* Restored only, change ignored */ 280 u32 vgic_ap0r[4]; 281 u32 vgic_ap1r[4]; 282 u64 vgic_lr[VGIC_V3_MAX_LRS]; 283 284 /* 285 * GICv4 ITS per-VPE data, containing the doorbell IRQ, the 286 * pending table pointer, the its_vm pointer and a few other 287 * HW specific things. As for the its_vm structure, this is 288 * linking the Linux IRQ subsystem and the ITS together. 289 */ 290 struct its_vpe its_vpe; 291 }; 292 293 struct vgic_cpu { 294 /* CPU vif control registers for world switch */ 295 union { 296 struct vgic_v2_cpu_if vgic_v2; 297 struct vgic_v3_cpu_if vgic_v3; 298 }; 299 300 unsigned int used_lrs; 301 struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS]; 302 303 spinlock_t ap_list_lock; /* Protects the ap_list */ 304 305 /* 306 * List of IRQs that this VCPU should consider because they are either 307 * Active or Pending (hence the name; AP list), or because they recently 308 * were one of the two and need to be migrated off this list to another 309 * VCPU. 310 */ 311 struct list_head ap_list_head; 312 313 /* 314 * Members below are used with GICv3 emulation only and represent 315 * parts of the redistributor. 316 */ 317 struct vgic_io_device rd_iodev; 318 struct vgic_io_device sgi_iodev; 319 struct vgic_redist_region *rdreg; 320 321 /* Contains the attributes and gpa of the LPI pending tables. */ 322 u64 pendbaser; 323 324 bool lpis_enabled; 325 326 /* Cache guest priority bits */ 327 u32 num_pri_bits; 328 329 /* Cache guest interrupt ID bits */ 330 u32 num_id_bits; 331 }; 332 333 extern struct static_key_false vgic_v2_cpuif_trap; 334 extern struct static_key_false vgic_v3_cpuif_trap; 335 336 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write); 337 void kvm_vgic_early_init(struct kvm *kvm); 338 int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu); 339 int kvm_vgic_create(struct kvm *kvm, u32 type); 340 void kvm_vgic_destroy(struct kvm *kvm); 341 void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu); 342 int kvm_vgic_map_resources(struct kvm *kvm); 343 int kvm_vgic_hyp_init(void); 344 void kvm_vgic_init_cpu_hardware(void); 345 346 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, 347 bool level, void *owner); 348 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq, 349 u32 vintid, bool (*get_input_level)(int vindid)); 350 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid); 351 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid); 352 353 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu); 354 355 void kvm_vgic_load(struct kvm_vcpu *vcpu); 356 void kvm_vgic_put(struct kvm_vcpu *vcpu); 357 358 #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel)) 359 #define vgic_initialized(k) ((k)->arch.vgic.initialized) 360 #define vgic_ready(k) ((k)->arch.vgic.ready) 361 #define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \ 362 ((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) 363 364 bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu); 365 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu); 366 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu); 367 void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid); 368 369 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg); 370 371 /** 372 * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW 373 * 374 * The host's GIC naturally limits the maximum amount of VCPUs a guest 375 * can use. 376 */ 377 static inline int kvm_vgic_get_max_vcpus(void) 378 { 379 return kvm_vgic_global_state.max_gic_vcpus; 380 } 381 382 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi); 383 384 /** 385 * kvm_vgic_setup_default_irq_routing: 386 * Setup a default flat gsi routing table mapping all SPIs 387 */ 388 int kvm_vgic_setup_default_irq_routing(struct kvm *kvm); 389 390 int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner); 391 392 struct kvm_kernel_irq_routing_entry; 393 394 int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq, 395 struct kvm_kernel_irq_routing_entry *irq_entry); 396 397 int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq, 398 struct kvm_kernel_irq_routing_entry *irq_entry); 399 400 void kvm_vgic_v4_enable_doorbell(struct kvm_vcpu *vcpu); 401 void kvm_vgic_v4_disable_doorbell(struct kvm_vcpu *vcpu); 402 403 #endif /* __KVM_ARM_VGIC_H */ 404