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 u8 group; /* 0 == group 0, 1 == group 1 */
137 enum vgic_irq_config config; /* Level or edge */
138
139 /*
140 * Callback function pointer to in-kernel devices that can tell us the
141 * state of the input level of mapped level-triggered IRQ faster than
142 * peaking into the physical GIC.
143 *
144 * Always called in non-preemptible section and the functions can use
145 * kvm_arm_get_running_vcpu() to get the vcpu pointer for private
146 * IRQs.
147 */
148 bool (*get_input_level)(int vintid);
149
150 void *owner; /* Opaque pointer to reserve an interrupt
151 for in-kernel devices. */
152 };
153
154 struct vgic_register_region;
155 struct vgic_its;
156
157 enum iodev_type {
158 IODEV_CPUIF,
159 IODEV_DIST,
160 IODEV_REDIST,
161 IODEV_ITS
162 };
163
164 struct vgic_io_device {
165 gpa_t base_addr;
166 union {
167 struct kvm_vcpu *redist_vcpu;
168 struct vgic_its *its;
169 };
170 const struct vgic_register_region *regions;
171 enum iodev_type iodev_type;
172 int nr_regions;
173 struct kvm_io_device dev;
174 };
175
176 struct vgic_its {
177 /* The base address of the ITS control register frame */
178 gpa_t vgic_its_base;
179
180 bool enabled;
181 struct vgic_io_device iodev;
182 struct kvm_device *dev;
183
184 /* These registers correspond to GITS_BASER{0,1} */
185 u64 baser_device_table;
186 u64 baser_coll_table;
187
188 /* Protects the command queue */
189 struct mutex cmd_lock;
190 u64 cbaser;
191 u32 creadr;
192 u32 cwriter;
193
194 /* migration ABI revision in use */
195 u32 abi_rev;
196
197 /* Protects the device and collection lists */
198 struct mutex its_lock;
199 struct list_head device_list;
200 struct list_head collection_list;
201 };
202
203 struct vgic_state_iter;
204
205 struct vgic_redist_region {
206 u32 index;
207 gpa_t base;
208 u32 count; /* number of redistributors or 0 if single region */
209 u32 free_index; /* index of the next free redistributor */
210 struct list_head list;
211 };
212
213 struct vgic_dist {
214 bool in_kernel;
215 bool ready;
216 bool initialized;
217
218 /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
219 u32 vgic_model;
220
221 /* Implementation revision as reported in the GICD_IIDR */
222 u32 implementation_rev;
223
224 /* Userspace can write to GICv2 IGROUPR */
225 bool v2_groups_user_writable;
226
227 /* Do injected MSIs require an additional device ID? */
228 bool msis_require_devid;
229
230 int nr_spis;
231
232 /* base addresses in guest physical address space: */
233 gpa_t vgic_dist_base; /* distributor */
234 union {
235 /* either a GICv2 CPU interface */
236 gpa_t vgic_cpu_base;
237 /* or a number of GICv3 redistributor regions */
238 struct list_head rd_regions;
239 };
240
241 /* distributor enabled */
242 bool enabled;
243
244 struct vgic_irq *spis;
245
246 struct vgic_io_device dist_iodev;
247
248 bool has_its;
249
250 /*
251 * Contains the attributes and gpa of the LPI configuration table.
252 * Since we report GICR_TYPER.CommonLPIAff as 0b00, we can share
253 * one address across all redistributors.
254 * GICv3 spec: 6.1.2 "LPI Configuration tables"
255 */
256 u64 propbaser;
257
258 /* Protects the lpi_list and the count value below. */
259 raw_spinlock_t lpi_list_lock;
260 struct list_head lpi_list_head;
261 int lpi_list_count;
262
263 /* used by vgic-debug */
264 struct vgic_state_iter *iter;
265
266 /*
267 * GICv4 ITS per-VM data, containing the IRQ domain, the VPE
268 * array, the property table pointer as well as allocation
269 * data. This essentially ties the Linux IRQ core and ITS
270 * together, and avoids leaking KVM's data structures anywhere
271 * else.
272 */
273 struct its_vm its_vm;
274 };
275
276 struct vgic_v2_cpu_if {
277 u32 vgic_hcr;
278 u32 vgic_vmcr;
279 u32 vgic_apr;
280 u32 vgic_lr[VGIC_V2_MAX_LRS];
281 };
282
283 struct vgic_v3_cpu_if {
284 u32 vgic_hcr;
285 u32 vgic_vmcr;
286 u32 vgic_sre; /* Restored only, change ignored */
287 u32 vgic_ap0r[4];
288 u32 vgic_ap1r[4];
289 u64 vgic_lr[VGIC_V3_MAX_LRS];
290
291 /*
292 * GICv4 ITS per-VPE data, containing the doorbell IRQ, the
293 * pending table pointer, the its_vm pointer and a few other
294 * HW specific things. As for the its_vm structure, this is
295 * linking the Linux IRQ subsystem and the ITS together.
296 */
297 struct its_vpe its_vpe;
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 unsigned int used_lrs;
308 struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
309
310 spinlock_t ap_list_lock; /* Protects the ap_list */
311
312 /*
313 * List of IRQs that this VCPU should consider because they are either
314 * Active or Pending (hence the name; AP list), or because they recently
315 * were one of the two and need to be migrated off this list to another
316 * VCPU.
317 */
318 struct list_head ap_list_head;
319
320 /*
321 * Members below are used with GICv3 emulation only and represent
322 * parts of the redistributor.
323 */
324 struct vgic_io_device rd_iodev;
325 struct vgic_io_device sgi_iodev;
326 struct vgic_redist_region *rdreg;
327
328 /* Contains the attributes and gpa of the LPI pending tables. */
329 u64 pendbaser;
330
331 bool lpis_enabled;
332
333 /* Cache guest priority bits */
334 u32 num_pri_bits;
335
336 /* Cache guest interrupt ID bits */
337 u32 num_id_bits;
338 };
339
340 extern struct static_key_false vgic_v2_cpuif_trap;
341 extern struct static_key_false vgic_v3_cpuif_trap;
342
343 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
344 void kvm_vgic_early_init(struct kvm *kvm);
345 int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu);
346 int kvm_vgic_create(struct kvm *kvm, u32 type);
347 void kvm_vgic_destroy(struct kvm *kvm);
348 void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
349 int kvm_vgic_map_resources(struct kvm *kvm);
350 int kvm_vgic_hyp_init(void);
351 void kvm_vgic_init_cpu_hardware(void);
352
353 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
354 bool level, void *owner);
355 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
356 u32 vintid, bool (*get_input_level)(int vindid));
357 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid);
358 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid);
359
360 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
361
362 void kvm_vgic_load(struct kvm_vcpu *vcpu);
363 void kvm_vgic_put(struct kvm_vcpu *vcpu);
364 void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu);
365
366 #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
367 #define vgic_initialized(k) ((k)->arch.vgic.initialized)
368 #define vgic_ready(k) ((k)->arch.vgic.ready)
369 #define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \
370 ((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS))
371
372 bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu);
373 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
374 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
375 void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid);
376
377 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg, bool allow_group1);
378
379 /**
380 * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
381 *
382 * The host's GIC naturally limits the maximum amount of VCPUs a guest
383 * can use.
384 */
kvm_vgic_get_max_vcpus(void)385 static inline int kvm_vgic_get_max_vcpus(void)
386 {
387 return kvm_vgic_global_state.max_gic_vcpus;
388 }
389
390 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
391
392 /**
393 * kvm_vgic_setup_default_irq_routing:
394 * Setup a default flat gsi routing table mapping all SPIs
395 */
396 int kvm_vgic_setup_default_irq_routing(struct kvm *kvm);
397
398 int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner);
399
400 struct kvm_kernel_irq_routing_entry;
401
402 int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq,
403 struct kvm_kernel_irq_routing_entry *irq_entry);
404
405 int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq,
406 struct kvm_kernel_irq_routing_entry *irq_entry);
407
408 void kvm_vgic_v4_enable_doorbell(struct kvm_vcpu *vcpu);
409 void kvm_vgic_v4_disable_doorbell(struct kvm_vcpu *vcpu);
410
411 #endif /* __KVM_ARM_VGIC_H */
412