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
74 /* GIC system register CPU interface */
75 struct static_key_false gicv3_cpuif;
76
77 u32 ich_vtr_el2;
78 };
79
80 extern struct vgic_global kvm_vgic_global_state;
81
82 #define VGIC_V2_MAX_LRS (1 << 6)
83 #define VGIC_V3_MAX_LRS 16
84 #define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr)
85
86 enum vgic_irq_config {
87 VGIC_CONFIG_EDGE = 0,
88 VGIC_CONFIG_LEVEL
89 };
90
91 struct vgic_irq {
92 raw_spinlock_t irq_lock; /* Protects the content of the struct */
93 struct list_head lpi_list; /* Used to link all LPIs together */
94 struct list_head ap_list;
95
96 struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU
97 * SPIs and LPIs: The VCPU whose ap_list
98 * this is queued on.
99 */
100
101 struct kvm_vcpu *target_vcpu; /* The VCPU that this interrupt should
102 * be sent to, as a result of the
103 * targets reg (v2) or the
104 * affinity reg (v3).
105 */
106
107 u32 intid; /* Guest visible INTID */
108 bool line_level; /* Level only */
109 bool pending_latch; /* The pending latch state used to calculate
110 * the pending state for both level
111 * and edge triggered IRQs. */
112 bool active; /* not used for LPIs */
113 bool enabled;
114 bool hw; /* Tied to HW IRQ */
115 struct kref refcount; /* Used for LPIs */
116 u32 hwintid; /* HW INTID number */
117 unsigned int host_irq; /* linux irq corresponding to hwintid */
118 union {
119 u8 targets; /* GICv2 target VCPUs mask */
120 u32 mpidr; /* GICv3 target VCPU */
121 };
122 u8 source; /* GICv2 SGIs only */
123 u8 active_source; /* GICv2 SGIs only */
124 u8 priority;
125 u8 group; /* 0 == group 0, 1 == group 1 */
126 enum vgic_irq_config config; /* Level or edge */
127
128 /*
129 * Callback function pointer to in-kernel devices that can tell us the
130 * state of the input level of mapped level-triggered IRQ faster than
131 * peaking into the physical GIC.
132 *
133 * Always called in non-preemptible section and the functions can use
134 * kvm_arm_get_running_vcpu() to get the vcpu pointer for private
135 * IRQs.
136 */
137 bool (*get_input_level)(int vintid);
138
139 void *owner; /* Opaque pointer to reserve an interrupt
140 for in-kernel devices. */
141 };
142
143 struct vgic_register_region;
144 struct vgic_its;
145
146 enum iodev_type {
147 IODEV_CPUIF,
148 IODEV_DIST,
149 IODEV_REDIST,
150 IODEV_ITS
151 };
152
153 struct vgic_io_device {
154 gpa_t base_addr;
155 union {
156 struct kvm_vcpu *redist_vcpu;
157 struct vgic_its *its;
158 };
159 const struct vgic_register_region *regions;
160 enum iodev_type iodev_type;
161 int nr_regions;
162 struct kvm_io_device dev;
163 };
164
165 struct vgic_its {
166 /* The base address of the ITS control register frame */
167 gpa_t vgic_its_base;
168
169 bool enabled;
170 struct vgic_io_device iodev;
171 struct kvm_device *dev;
172
173 /* These registers correspond to GITS_BASER{0,1} */
174 u64 baser_device_table;
175 u64 baser_coll_table;
176
177 /* Protects the command queue */
178 struct mutex cmd_lock;
179 u64 cbaser;
180 u32 creadr;
181 u32 cwriter;
182
183 /* migration ABI revision in use */
184 u32 abi_rev;
185
186 /* Protects the device and collection lists */
187 struct mutex its_lock;
188 struct list_head device_list;
189 struct list_head collection_list;
190 };
191
192 struct vgic_state_iter;
193
194 struct vgic_redist_region {
195 u32 index;
196 gpa_t base;
197 u32 count; /* number of redistributors or 0 if single region */
198 u32 free_index; /* index of the next free redistributor */
199 struct list_head list;
200 };
201
202 struct vgic_dist {
203 bool in_kernel;
204 bool ready;
205 bool initialized;
206
207 /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
208 u32 vgic_model;
209
210 /* Implementation revision as reported in the GICD_IIDR */
211 u32 implementation_rev;
212
213 /* Userspace can write to GICv2 IGROUPR */
214 bool v2_groups_user_writable;
215
216 /* Do injected MSIs require an additional device ID? */
217 bool msis_require_devid;
218
219 int nr_spis;
220
221 /* base addresses in guest physical address space: */
222 gpa_t vgic_dist_base; /* distributor */
223 union {
224 /* either a GICv2 CPU interface */
225 gpa_t vgic_cpu_base;
226 /* or a number of GICv3 redistributor regions */
227 struct list_head rd_regions;
228 };
229
230 /* distributor enabled */
231 bool enabled;
232
233 struct vgic_irq *spis;
234
235 struct vgic_io_device dist_iodev;
236
237 bool has_its;
238
239 /*
240 * Contains the attributes and gpa of the LPI configuration table.
241 * Since we report GICR_TYPER.CommonLPIAff as 0b00, we can share
242 * one address across all redistributors.
243 * GICv3 spec: 6.1.2 "LPI Configuration tables"
244 */
245 u64 propbaser;
246
247 /* Protects the lpi_list and the count value below. */
248 raw_spinlock_t lpi_list_lock;
249 struct list_head lpi_list_head;
250 int lpi_list_count;
251
252 /* LPI translation cache */
253 struct list_head lpi_translation_cache;
254
255 /* used by vgic-debug */
256 struct vgic_state_iter *iter;
257
258 /*
259 * GICv4 ITS per-VM data, containing the IRQ domain, the VPE
260 * array, the property table pointer as well as allocation
261 * data. This essentially ties the Linux IRQ core and ITS
262 * together, and avoids leaking KVM's data structures anywhere
263 * else.
264 */
265 struct its_vm its_vm;
266 };
267
268 struct vgic_v2_cpu_if {
269 u32 vgic_hcr;
270 u32 vgic_vmcr;
271 u32 vgic_apr;
272 u32 vgic_lr[VGIC_V2_MAX_LRS];
273 };
274
275 struct vgic_v3_cpu_if {
276 u32 vgic_hcr;
277 u32 vgic_vmcr;
278 u32 vgic_sre; /* Restored only, change ignored */
279 u32 vgic_ap0r[4];
280 u32 vgic_ap1r[4];
281 u64 vgic_lr[VGIC_V3_MAX_LRS];
282
283 /*
284 * GICv4 ITS per-VPE data, containing the doorbell IRQ, the
285 * pending table pointer, the its_vm pointer and a few other
286 * HW specific things. As for the its_vm structure, this is
287 * linking the Linux IRQ subsystem and the ITS together.
288 */
289 struct its_vpe its_vpe;
290 };
291
292 struct vgic_cpu {
293 /* CPU vif control registers for world switch */
294 union {
295 struct vgic_v2_cpu_if vgic_v2;
296 struct vgic_v3_cpu_if vgic_v3;
297 };
298
299 unsigned int used_lrs;
300 struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
301
302 raw_spinlock_t ap_list_lock; /* Protects the ap_list */
303
304 /*
305 * List of IRQs that this VCPU should consider because they are either
306 * Active or Pending (hence the name; AP list), or because they recently
307 * were one of the two and need to be migrated off this list to another
308 * VCPU.
309 */
310 struct list_head ap_list_head;
311
312 /*
313 * Members below are used with GICv3 emulation only and represent
314 * parts of the redistributor.
315 */
316 struct vgic_io_device rd_iodev;
317 struct vgic_redist_region *rdreg;
318
319 /* Contains the attributes and gpa of the LPI pending tables. */
320 u64 pendbaser;
321
322 bool lpis_enabled;
323
324 /* Cache guest priority bits */
325 u32 num_pri_bits;
326
327 /* Cache guest interrupt ID bits */
328 u32 num_id_bits;
329 };
330
331 extern struct static_key_false vgic_v2_cpuif_trap;
332 extern struct static_key_false vgic_v3_cpuif_trap;
333
334 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
335 void kvm_vgic_early_init(struct kvm *kvm);
336 int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu);
337 int kvm_vgic_create(struct kvm *kvm, u32 type);
338 void kvm_vgic_destroy(struct kvm *kvm);
339 void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
340 int kvm_vgic_map_resources(struct kvm *kvm);
341 int kvm_vgic_hyp_init(void);
342 void kvm_vgic_init_cpu_hardware(void);
343
344 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
345 bool level, void *owner);
346 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
347 u32 vintid, bool (*get_input_level)(int vindid));
348 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid);
349 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid);
350
351 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
352
353 void kvm_vgic_load(struct kvm_vcpu *vcpu);
354 void kvm_vgic_put(struct kvm_vcpu *vcpu);
355 void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu);
356
357 #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
358 #define vgic_initialized(k) ((k)->arch.vgic.initialized)
359 #define vgic_ready(k) ((k)->arch.vgic.ready)
360 #define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \
361 ((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS))
362
363 bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu);
364 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
365 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
366 void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid);
367
368 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg, bool allow_group1);
369
370 /**
371 * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
372 *
373 * The host's GIC naturally limits the maximum amount of VCPUs a guest
374 * can use.
375 */
kvm_vgic_get_max_vcpus(void)376 static inline int kvm_vgic_get_max_vcpus(void)
377 {
378 return kvm_vgic_global_state.max_gic_vcpus;
379 }
380
381 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
382
383 /**
384 * kvm_vgic_setup_default_irq_routing:
385 * Setup a default flat gsi routing table mapping all SPIs
386 */
387 int kvm_vgic_setup_default_irq_routing(struct kvm *kvm);
388
389 int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner);
390
391 struct kvm_kernel_irq_routing_entry;
392
393 int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq,
394 struct kvm_kernel_irq_routing_entry *irq_entry);
395
396 int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq,
397 struct kvm_kernel_irq_routing_entry *irq_entry);
398
399 void kvm_vgic_v4_enable_doorbell(struct kvm_vcpu *vcpu);
400 void kvm_vgic_v4_disable_doorbell(struct kvm_vcpu *vcpu);
401
402 #endif /* __KVM_ARM_VGIC_H */
403
