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1a89dd91 MZ |
1 | /* |
2 | * Copyright (C) 2012 ARM Ltd. | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
01ac5e34 | 19 | #include <linux/cpu.h> |
1a89dd91 MZ |
20 | #include <linux/kvm.h> |
21 | #include <linux/kvm_host.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/io.h> | |
01ac5e34 MZ |
24 | #include <linux/of.h> |
25 | #include <linux/of_address.h> | |
26 | #include <linux/of_irq.h> | |
2a2f3e26 | 27 | #include <linux/uaccess.h> |
01ac5e34 MZ |
28 | |
29 | #include <linux/irqchip/arm-gic.h> | |
30 | ||
1a89dd91 | 31 | #include <asm/kvm_emulate.h> |
01ac5e34 MZ |
32 | #include <asm/kvm_arm.h> |
33 | #include <asm/kvm_mmu.h> | |
1a89dd91 | 34 | |
b47ef92a MZ |
35 | /* |
36 | * How the whole thing works (courtesy of Christoffer Dall): | |
37 | * | |
38 | * - At any time, the dist->irq_pending_on_cpu is the oracle that knows if | |
7e362919 CD |
39 | * something is pending on the CPU interface. |
40 | * - Interrupts that are pending on the distributor are stored on the | |
41 | * vgic.irq_pending vgic bitmap (this bitmap is updated by both user land | |
42 | * ioctls and guest mmio ops, and other in-kernel peripherals such as the | |
43 | * arch. timers). | |
b47ef92a MZ |
44 | * - Every time the bitmap changes, the irq_pending_on_cpu oracle is |
45 | * recalculated | |
46 | * - To calculate the oracle, we need info for each cpu from | |
47 | * compute_pending_for_cpu, which considers: | |
227844f5 CD |
48 | * - PPI: dist->irq_pending & dist->irq_enable |
49 | * - SPI: dist->irq_pending & dist->irq_enable & dist->irq_spi_target | |
7e362919 | 50 | * - irq_spi_target is a 'formatted' version of the GICD_ITARGETSRn |
b47ef92a MZ |
51 | * registers, stored on each vcpu. We only keep one bit of |
52 | * information per interrupt, making sure that only one vcpu can | |
53 | * accept the interrupt. | |
7e362919 | 54 | * - If any of the above state changes, we must recalculate the oracle. |
b47ef92a MZ |
55 | * - The same is true when injecting an interrupt, except that we only |
56 | * consider a single interrupt at a time. The irq_spi_cpu array | |
57 | * contains the target CPU for each SPI. | |
58 | * | |
59 | * The handling of level interrupts adds some extra complexity. We | |
60 | * need to track when the interrupt has been EOIed, so we can sample | |
61 | * the 'line' again. This is achieved as such: | |
62 | * | |
63 | * - When a level interrupt is moved onto a vcpu, the corresponding | |
dbf20f9d | 64 | * bit in irq_queued is set. As long as this bit is set, the line |
b47ef92a MZ |
65 | * will be ignored for further interrupts. The interrupt is injected |
66 | * into the vcpu with the GICH_LR_EOI bit set (generate a | |
67 | * maintenance interrupt on EOI). | |
68 | * - When the interrupt is EOIed, the maintenance interrupt fires, | |
dbf20f9d | 69 | * and clears the corresponding bit in irq_queued. This allows the |
b47ef92a | 70 | * interrupt line to be sampled again. |
faa1b46c CD |
71 | * - Note that level-triggered interrupts can also be set to pending from |
72 | * writes to GICD_ISPENDRn and lowering the external input line does not | |
73 | * cause the interrupt to become inactive in such a situation. | |
74 | * Conversely, writes to GICD_ICPENDRn do not cause the interrupt to become | |
75 | * inactive as long as the external input line is held high. | |
b47ef92a MZ |
76 | */ |
77 | ||
330690cd CD |
78 | #define VGIC_ADDR_UNDEF (-1) |
79 | #define IS_VGIC_ADDR_UNDEF(_x) ((_x) == VGIC_ADDR_UNDEF) | |
80 | ||
fa20f5ae CD |
81 | #define PRODUCT_ID_KVM 0x4b /* ASCII code K */ |
82 | #define IMPLEMENTER_ARM 0x43b | |
83 | #define GICC_ARCH_VERSION_V2 0x2 | |
84 | ||
1a89dd91 MZ |
85 | #define ACCESS_READ_VALUE (1 << 0) |
86 | #define ACCESS_READ_RAZ (0 << 0) | |
87 | #define ACCESS_READ_MASK(x) ((x) & (1 << 0)) | |
88 | #define ACCESS_WRITE_IGNORED (0 << 1) | |
89 | #define ACCESS_WRITE_SETBIT (1 << 1) | |
90 | #define ACCESS_WRITE_CLEARBIT (2 << 1) | |
91 | #define ACCESS_WRITE_VALUE (3 << 1) | |
92 | #define ACCESS_WRITE_MASK(x) ((x) & (3 << 1)) | |
93 | ||
a1fcb44e | 94 | static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu); |
8d5c6b06 | 95 | static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu); |
b47ef92a | 96 | static void vgic_update_state(struct kvm *kvm); |
5863c2ce | 97 | static void vgic_kick_vcpus(struct kvm *kvm); |
c1bfb577 | 98 | static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi); |
b47ef92a | 99 | static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg); |
8d5c6b06 MZ |
100 | static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr); |
101 | static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc); | |
beee38b9 MZ |
102 | static void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); |
103 | static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); | |
01ac5e34 | 104 | |
8f186d52 MZ |
105 | static const struct vgic_ops *vgic_ops; |
106 | static const struct vgic_params *vgic; | |
b47ef92a | 107 | |
9662fb48 | 108 | /* |
c1bfb577 MZ |
109 | * struct vgic_bitmap contains a bitmap made of unsigned longs, but |
110 | * extracts u32s out of them. | |
9662fb48 VK |
111 | * |
112 | * This does not work on 64-bit BE systems, because the bitmap access | |
113 | * will store two consecutive 32-bit words with the higher-addressed | |
114 | * register's bits at the lower index and the lower-addressed register's | |
115 | * bits at the higher index. | |
116 | * | |
117 | * Therefore, swizzle the register index when accessing the 32-bit word | |
118 | * registers to access the right register's value. | |
119 | */ | |
120 | #if defined(CONFIG_CPU_BIG_ENDIAN) && BITS_PER_LONG == 64 | |
121 | #define REG_OFFSET_SWIZZLE 1 | |
122 | #else | |
123 | #define REG_OFFSET_SWIZZLE 0 | |
124 | #endif | |
b47ef92a | 125 | |
c1bfb577 MZ |
126 | static int vgic_init_bitmap(struct vgic_bitmap *b, int nr_cpus, int nr_irqs) |
127 | { | |
128 | int nr_longs; | |
129 | ||
130 | nr_longs = nr_cpus + BITS_TO_LONGS(nr_irqs - VGIC_NR_PRIVATE_IRQS); | |
131 | ||
132 | b->private = kzalloc(sizeof(unsigned long) * nr_longs, GFP_KERNEL); | |
133 | if (!b->private) | |
134 | return -ENOMEM; | |
135 | ||
136 | b->shared = b->private + nr_cpus; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static void vgic_free_bitmap(struct vgic_bitmap *b) | |
142 | { | |
143 | kfree(b->private); | |
144 | b->private = NULL; | |
145 | b->shared = NULL; | |
146 | } | |
147 | ||
2df36a5d CD |
148 | /* |
149 | * Call this function to convert a u64 value to an unsigned long * bitmask | |
150 | * in a way that works on both 32-bit and 64-bit LE and BE platforms. | |
151 | * | |
152 | * Warning: Calling this function may modify *val. | |
153 | */ | |
154 | static unsigned long *u64_to_bitmask(u64 *val) | |
155 | { | |
156 | #if defined(CONFIG_CPU_BIG_ENDIAN) && BITS_PER_LONG == 32 | |
157 | *val = (*val >> 32) | (*val << 32); | |
158 | #endif | |
159 | return (unsigned long *)val; | |
160 | } | |
161 | ||
b47ef92a MZ |
162 | static u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x, |
163 | int cpuid, u32 offset) | |
164 | { | |
165 | offset >>= 2; | |
166 | if (!offset) | |
c1bfb577 | 167 | return (u32 *)(x->private + cpuid) + REG_OFFSET_SWIZZLE; |
b47ef92a | 168 | else |
c1bfb577 | 169 | return (u32 *)(x->shared) + ((offset - 1) ^ REG_OFFSET_SWIZZLE); |
b47ef92a MZ |
170 | } |
171 | ||
172 | static int vgic_bitmap_get_irq_val(struct vgic_bitmap *x, | |
173 | int cpuid, int irq) | |
174 | { | |
175 | if (irq < VGIC_NR_PRIVATE_IRQS) | |
c1bfb577 | 176 | return test_bit(irq, x->private + cpuid); |
b47ef92a | 177 | |
c1bfb577 | 178 | return test_bit(irq - VGIC_NR_PRIVATE_IRQS, x->shared); |
b47ef92a MZ |
179 | } |
180 | ||
181 | static void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid, | |
182 | int irq, int val) | |
183 | { | |
184 | unsigned long *reg; | |
185 | ||
186 | if (irq < VGIC_NR_PRIVATE_IRQS) { | |
c1bfb577 | 187 | reg = x->private + cpuid; |
b47ef92a | 188 | } else { |
c1bfb577 | 189 | reg = x->shared; |
b47ef92a MZ |
190 | irq -= VGIC_NR_PRIVATE_IRQS; |
191 | } | |
192 | ||
193 | if (val) | |
194 | set_bit(irq, reg); | |
195 | else | |
196 | clear_bit(irq, reg); | |
197 | } | |
198 | ||
199 | static unsigned long *vgic_bitmap_get_cpu_map(struct vgic_bitmap *x, int cpuid) | |
200 | { | |
c1bfb577 | 201 | return x->private + cpuid; |
b47ef92a MZ |
202 | } |
203 | ||
204 | static unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x) | |
205 | { | |
c1bfb577 MZ |
206 | return x->shared; |
207 | } | |
208 | ||
209 | static int vgic_init_bytemap(struct vgic_bytemap *x, int nr_cpus, int nr_irqs) | |
210 | { | |
211 | int size; | |
212 | ||
213 | size = nr_cpus * VGIC_NR_PRIVATE_IRQS; | |
214 | size += nr_irqs - VGIC_NR_PRIVATE_IRQS; | |
215 | ||
216 | x->private = kzalloc(size, GFP_KERNEL); | |
217 | if (!x->private) | |
218 | return -ENOMEM; | |
219 | ||
220 | x->shared = x->private + nr_cpus * VGIC_NR_PRIVATE_IRQS / sizeof(u32); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static void vgic_free_bytemap(struct vgic_bytemap *b) | |
225 | { | |
226 | kfree(b->private); | |
227 | b->private = NULL; | |
228 | b->shared = NULL; | |
b47ef92a MZ |
229 | } |
230 | ||
231 | static u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset) | |
232 | { | |
c1bfb577 MZ |
233 | u32 *reg; |
234 | ||
235 | if (offset < VGIC_NR_PRIVATE_IRQS) { | |
236 | reg = x->private; | |
237 | offset += cpuid * VGIC_NR_PRIVATE_IRQS; | |
238 | } else { | |
239 | reg = x->shared; | |
240 | offset -= VGIC_NR_PRIVATE_IRQS; | |
241 | } | |
242 | ||
243 | return reg + (offset / sizeof(u32)); | |
b47ef92a MZ |
244 | } |
245 | ||
246 | #define VGIC_CFG_LEVEL 0 | |
247 | #define VGIC_CFG_EDGE 1 | |
248 | ||
249 | static bool vgic_irq_is_edge(struct kvm_vcpu *vcpu, int irq) | |
250 | { | |
251 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
252 | int irq_val; | |
253 | ||
254 | irq_val = vgic_bitmap_get_irq_val(&dist->irq_cfg, vcpu->vcpu_id, irq); | |
255 | return irq_val == VGIC_CFG_EDGE; | |
256 | } | |
257 | ||
258 | static int vgic_irq_is_enabled(struct kvm_vcpu *vcpu, int irq) | |
259 | { | |
260 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
261 | ||
262 | return vgic_bitmap_get_irq_val(&dist->irq_enabled, vcpu->vcpu_id, irq); | |
263 | } | |
264 | ||
dbf20f9d | 265 | static int vgic_irq_is_queued(struct kvm_vcpu *vcpu, int irq) |
9d949dce MZ |
266 | { |
267 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
268 | ||
dbf20f9d | 269 | return vgic_bitmap_get_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq); |
9d949dce MZ |
270 | } |
271 | ||
dbf20f9d | 272 | static void vgic_irq_set_queued(struct kvm_vcpu *vcpu, int irq) |
9d949dce MZ |
273 | { |
274 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
275 | ||
dbf20f9d | 276 | vgic_bitmap_set_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq, 1); |
9d949dce MZ |
277 | } |
278 | ||
dbf20f9d | 279 | static void vgic_irq_clear_queued(struct kvm_vcpu *vcpu, int irq) |
9d949dce MZ |
280 | { |
281 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
282 | ||
dbf20f9d | 283 | vgic_bitmap_set_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq, 0); |
9d949dce MZ |
284 | } |
285 | ||
faa1b46c CD |
286 | static int vgic_dist_irq_get_level(struct kvm_vcpu *vcpu, int irq) |
287 | { | |
288 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
289 | ||
290 | return vgic_bitmap_get_irq_val(&dist->irq_level, vcpu->vcpu_id, irq); | |
291 | } | |
292 | ||
293 | static void vgic_dist_irq_set_level(struct kvm_vcpu *vcpu, int irq) | |
294 | { | |
295 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
296 | ||
297 | vgic_bitmap_set_irq_val(&dist->irq_level, vcpu->vcpu_id, irq, 1); | |
298 | } | |
299 | ||
300 | static void vgic_dist_irq_clear_level(struct kvm_vcpu *vcpu, int irq) | |
301 | { | |
302 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
303 | ||
304 | vgic_bitmap_set_irq_val(&dist->irq_level, vcpu->vcpu_id, irq, 0); | |
305 | } | |
306 | ||
307 | static int vgic_dist_irq_soft_pend(struct kvm_vcpu *vcpu, int irq) | |
308 | { | |
309 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
310 | ||
311 | return vgic_bitmap_get_irq_val(&dist->irq_soft_pend, vcpu->vcpu_id, irq); | |
312 | } | |
313 | ||
314 | static void vgic_dist_irq_clear_soft_pend(struct kvm_vcpu *vcpu, int irq) | |
315 | { | |
316 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
317 | ||
318 | vgic_bitmap_set_irq_val(&dist->irq_soft_pend, vcpu->vcpu_id, irq, 0); | |
319 | } | |
320 | ||
9d949dce MZ |
321 | static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq) |
322 | { | |
323 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
324 | ||
227844f5 | 325 | return vgic_bitmap_get_irq_val(&dist->irq_pending, vcpu->vcpu_id, irq); |
9d949dce MZ |
326 | } |
327 | ||
227844f5 | 328 | static void vgic_dist_irq_set_pending(struct kvm_vcpu *vcpu, int irq) |
b47ef92a MZ |
329 | { |
330 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
331 | ||
227844f5 | 332 | vgic_bitmap_set_irq_val(&dist->irq_pending, vcpu->vcpu_id, irq, 1); |
b47ef92a MZ |
333 | } |
334 | ||
227844f5 | 335 | static void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu, int irq) |
b47ef92a MZ |
336 | { |
337 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
338 | ||
227844f5 | 339 | vgic_bitmap_set_irq_val(&dist->irq_pending, vcpu->vcpu_id, irq, 0); |
b47ef92a MZ |
340 | } |
341 | ||
342 | static void vgic_cpu_irq_set(struct kvm_vcpu *vcpu, int irq) | |
343 | { | |
344 | if (irq < VGIC_NR_PRIVATE_IRQS) | |
345 | set_bit(irq, vcpu->arch.vgic_cpu.pending_percpu); | |
346 | else | |
347 | set_bit(irq - VGIC_NR_PRIVATE_IRQS, | |
348 | vcpu->arch.vgic_cpu.pending_shared); | |
349 | } | |
350 | ||
351 | static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq) | |
352 | { | |
353 | if (irq < VGIC_NR_PRIVATE_IRQS) | |
354 | clear_bit(irq, vcpu->arch.vgic_cpu.pending_percpu); | |
355 | else | |
356 | clear_bit(irq - VGIC_NR_PRIVATE_IRQS, | |
357 | vcpu->arch.vgic_cpu.pending_shared); | |
358 | } | |
359 | ||
dbf20f9d CD |
360 | static bool vgic_can_sample_irq(struct kvm_vcpu *vcpu, int irq) |
361 | { | |
362 | return vgic_irq_is_edge(vcpu, irq) || !vgic_irq_is_queued(vcpu, irq); | |
363 | } | |
364 | ||
1a89dd91 MZ |
365 | static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask) |
366 | { | |
1c9f0471 | 367 | return le32_to_cpu(*((u32 *)mmio->data)) & mask; |
1a89dd91 MZ |
368 | } |
369 | ||
370 | static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value) | |
371 | { | |
1c9f0471 | 372 | *((u32 *)mmio->data) = cpu_to_le32(value) & mask; |
1a89dd91 MZ |
373 | } |
374 | ||
375 | /** | |
376 | * vgic_reg_access - access vgic register | |
377 | * @mmio: pointer to the data describing the mmio access | |
378 | * @reg: pointer to the virtual backing of vgic distributor data | |
379 | * @offset: least significant 2 bits used for word offset | |
380 | * @mode: ACCESS_ mode (see defines above) | |
381 | * | |
382 | * Helper to make vgic register access easier using one of the access | |
383 | * modes defined for vgic register access | |
384 | * (read,raz,write-ignored,setbit,clearbit,write) | |
385 | */ | |
386 | static void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg, | |
387 | phys_addr_t offset, int mode) | |
388 | { | |
389 | int word_offset = (offset & 3) * 8; | |
390 | u32 mask = (1UL << (mmio->len * 8)) - 1; | |
391 | u32 regval; | |
392 | ||
393 | /* | |
394 | * Any alignment fault should have been delivered to the guest | |
395 | * directly (ARM ARM B3.12.7 "Prioritization of aborts"). | |
396 | */ | |
397 | ||
398 | if (reg) { | |
399 | regval = *reg; | |
400 | } else { | |
401 | BUG_ON(mode != (ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED)); | |
402 | regval = 0; | |
403 | } | |
404 | ||
405 | if (mmio->is_write) { | |
406 | u32 data = mmio_data_read(mmio, mask) << word_offset; | |
407 | switch (ACCESS_WRITE_MASK(mode)) { | |
408 | case ACCESS_WRITE_IGNORED: | |
409 | return; | |
410 | ||
411 | case ACCESS_WRITE_SETBIT: | |
412 | regval |= data; | |
413 | break; | |
414 | ||
415 | case ACCESS_WRITE_CLEARBIT: | |
416 | regval &= ~data; | |
417 | break; | |
418 | ||
419 | case ACCESS_WRITE_VALUE: | |
420 | regval = (regval & ~(mask << word_offset)) | data; | |
421 | break; | |
422 | } | |
423 | *reg = regval; | |
424 | } else { | |
425 | switch (ACCESS_READ_MASK(mode)) { | |
426 | case ACCESS_READ_RAZ: | |
427 | regval = 0; | |
428 | /* fall through */ | |
429 | ||
430 | case ACCESS_READ_VALUE: | |
431 | mmio_data_write(mmio, mask, regval >> word_offset); | |
432 | } | |
433 | } | |
434 | } | |
435 | ||
b47ef92a MZ |
436 | static bool handle_mmio_misc(struct kvm_vcpu *vcpu, |
437 | struct kvm_exit_mmio *mmio, phys_addr_t offset) | |
438 | { | |
439 | u32 reg; | |
440 | u32 word_offset = offset & 3; | |
441 | ||
442 | switch (offset & ~3) { | |
fa20f5ae | 443 | case 0: /* GICD_CTLR */ |
b47ef92a MZ |
444 | reg = vcpu->kvm->arch.vgic.enabled; |
445 | vgic_reg_access(mmio, ®, word_offset, | |
446 | ACCESS_READ_VALUE | ACCESS_WRITE_VALUE); | |
447 | if (mmio->is_write) { | |
448 | vcpu->kvm->arch.vgic.enabled = reg & 1; | |
449 | vgic_update_state(vcpu->kvm); | |
450 | return true; | |
451 | } | |
452 | break; | |
453 | ||
fa20f5ae | 454 | case 4: /* GICD_TYPER */ |
b47ef92a | 455 | reg = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5; |
5fb66da6 | 456 | reg |= (vcpu->kvm->arch.vgic.nr_irqs >> 5) - 1; |
b47ef92a MZ |
457 | vgic_reg_access(mmio, ®, word_offset, |
458 | ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED); | |
459 | break; | |
460 | ||
fa20f5ae CD |
461 | case 8: /* GICD_IIDR */ |
462 | reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0); | |
b47ef92a MZ |
463 | vgic_reg_access(mmio, ®, word_offset, |
464 | ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED); | |
465 | break; | |
466 | } | |
467 | ||
468 | return false; | |
469 | } | |
470 | ||
471 | static bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, | |
472 | struct kvm_exit_mmio *mmio, phys_addr_t offset) | |
473 | { | |
474 | vgic_reg_access(mmio, NULL, offset, | |
475 | ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED); | |
476 | return false; | |
477 | } | |
478 | ||
479 | static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu, | |
480 | struct kvm_exit_mmio *mmio, | |
481 | phys_addr_t offset) | |
482 | { | |
483 | u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled, | |
484 | vcpu->vcpu_id, offset); | |
485 | vgic_reg_access(mmio, reg, offset, | |
486 | ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT); | |
487 | if (mmio->is_write) { | |
488 | vgic_update_state(vcpu->kvm); | |
489 | return true; | |
490 | } | |
491 | ||
492 | return false; | |
493 | } | |
494 | ||
495 | static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu, | |
496 | struct kvm_exit_mmio *mmio, | |
497 | phys_addr_t offset) | |
498 | { | |
499 | u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled, | |
500 | vcpu->vcpu_id, offset); | |
501 | vgic_reg_access(mmio, reg, offset, | |
502 | ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT); | |
503 | if (mmio->is_write) { | |
504 | if (offset < 4) /* Force SGI enabled */ | |
505 | *reg |= 0xffff; | |
a1fcb44e | 506 | vgic_retire_disabled_irqs(vcpu); |
b47ef92a MZ |
507 | vgic_update_state(vcpu->kvm); |
508 | return true; | |
509 | } | |
510 | ||
511 | return false; | |
512 | } | |
513 | ||
514 | static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu, | |
515 | struct kvm_exit_mmio *mmio, | |
516 | phys_addr_t offset) | |
517 | { | |
9da48b55 | 518 | u32 *reg, orig; |
faa1b46c CD |
519 | u32 level_mask; |
520 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
521 | ||
522 | reg = vgic_bitmap_get_reg(&dist->irq_cfg, vcpu->vcpu_id, offset); | |
523 | level_mask = (~(*reg)); | |
524 | ||
525 | /* Mark both level and edge triggered irqs as pending */ | |
526 | reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu->vcpu_id, offset); | |
9da48b55 | 527 | orig = *reg; |
b47ef92a MZ |
528 | vgic_reg_access(mmio, reg, offset, |
529 | ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT); | |
faa1b46c | 530 | |
b47ef92a | 531 | if (mmio->is_write) { |
faa1b46c CD |
532 | /* Set the soft-pending flag only for level-triggered irqs */ |
533 | reg = vgic_bitmap_get_reg(&dist->irq_soft_pend, | |
534 | vcpu->vcpu_id, offset); | |
535 | vgic_reg_access(mmio, reg, offset, | |
536 | ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT); | |
537 | *reg &= level_mask; | |
538 | ||
9da48b55 CD |
539 | /* Ignore writes to SGIs */ |
540 | if (offset < 2) { | |
541 | *reg &= ~0xffff; | |
542 | *reg |= orig & 0xffff; | |
543 | } | |
544 | ||
b47ef92a MZ |
545 | vgic_update_state(vcpu->kvm); |
546 | return true; | |
547 | } | |
548 | ||
549 | return false; | |
550 | } | |
551 | ||
552 | static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu, | |
553 | struct kvm_exit_mmio *mmio, | |
554 | phys_addr_t offset) | |
555 | { | |
faa1b46c | 556 | u32 *level_active; |
9da48b55 | 557 | u32 *reg, orig; |
faa1b46c CD |
558 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; |
559 | ||
560 | reg = vgic_bitmap_get_reg(&dist->irq_pending, vcpu->vcpu_id, offset); | |
9da48b55 | 561 | orig = *reg; |
b47ef92a MZ |
562 | vgic_reg_access(mmio, reg, offset, |
563 | ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT); | |
564 | if (mmio->is_write) { | |
faa1b46c CD |
565 | /* Re-set level triggered level-active interrupts */ |
566 | level_active = vgic_bitmap_get_reg(&dist->irq_level, | |
567 | vcpu->vcpu_id, offset); | |
568 | reg = vgic_bitmap_get_reg(&dist->irq_pending, | |
569 | vcpu->vcpu_id, offset); | |
570 | *reg |= *level_active; | |
571 | ||
9da48b55 CD |
572 | /* Ignore writes to SGIs */ |
573 | if (offset < 2) { | |
574 | *reg &= ~0xffff; | |
575 | *reg |= orig & 0xffff; | |
576 | } | |
577 | ||
faa1b46c CD |
578 | /* Clear soft-pending flags */ |
579 | reg = vgic_bitmap_get_reg(&dist->irq_soft_pend, | |
580 | vcpu->vcpu_id, offset); | |
581 | vgic_reg_access(mmio, reg, offset, | |
582 | ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT); | |
583 | ||
b47ef92a MZ |
584 | vgic_update_state(vcpu->kvm); |
585 | return true; | |
586 | } | |
587 | ||
588 | return false; | |
589 | } | |
590 | ||
591 | static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu, | |
592 | struct kvm_exit_mmio *mmio, | |
593 | phys_addr_t offset) | |
594 | { | |
595 | u32 *reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority, | |
596 | vcpu->vcpu_id, offset); | |
597 | vgic_reg_access(mmio, reg, offset, | |
598 | ACCESS_READ_VALUE | ACCESS_WRITE_VALUE); | |
599 | return false; | |
600 | } | |
601 | ||
602 | #define GICD_ITARGETSR_SIZE 32 | |
603 | #define GICD_CPUTARGETS_BITS 8 | |
604 | #define GICD_IRQS_PER_ITARGETSR (GICD_ITARGETSR_SIZE / GICD_CPUTARGETS_BITS) | |
605 | static u32 vgic_get_target_reg(struct kvm *kvm, int irq) | |
606 | { | |
607 | struct vgic_dist *dist = &kvm->arch.vgic; | |
986af8e0 | 608 | int i; |
b47ef92a MZ |
609 | u32 val = 0; |
610 | ||
611 | irq -= VGIC_NR_PRIVATE_IRQS; | |
612 | ||
986af8e0 MZ |
613 | for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) |
614 | val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8); | |
b47ef92a MZ |
615 | |
616 | return val; | |
617 | } | |
618 | ||
619 | static void vgic_set_target_reg(struct kvm *kvm, u32 val, int irq) | |
620 | { | |
621 | struct vgic_dist *dist = &kvm->arch.vgic; | |
622 | struct kvm_vcpu *vcpu; | |
623 | int i, c; | |
624 | unsigned long *bmap; | |
625 | u32 target; | |
626 | ||
627 | irq -= VGIC_NR_PRIVATE_IRQS; | |
628 | ||
629 | /* | |
630 | * Pick the LSB in each byte. This ensures we target exactly | |
631 | * one vcpu per IRQ. If the byte is null, assume we target | |
632 | * CPU0. | |
633 | */ | |
634 | for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) { | |
635 | int shift = i * GICD_CPUTARGETS_BITS; | |
636 | target = ffs((val >> shift) & 0xffU); | |
637 | target = target ? (target - 1) : 0; | |
638 | dist->irq_spi_cpu[irq + i] = target; | |
639 | kvm_for_each_vcpu(c, vcpu, kvm) { | |
640 | bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]); | |
641 | if (c == target) | |
642 | set_bit(irq + i, bmap); | |
643 | else | |
644 | clear_bit(irq + i, bmap); | |
645 | } | |
646 | } | |
647 | } | |
648 | ||
649 | static bool handle_mmio_target_reg(struct kvm_vcpu *vcpu, | |
650 | struct kvm_exit_mmio *mmio, | |
651 | phys_addr_t offset) | |
652 | { | |
653 | u32 reg; | |
654 | ||
655 | /* We treat the banked interrupts targets as read-only */ | |
656 | if (offset < 32) { | |
657 | u32 roreg = 1 << vcpu->vcpu_id; | |
658 | roreg |= roreg << 8; | |
659 | roreg |= roreg << 16; | |
660 | ||
661 | vgic_reg_access(mmio, &roreg, offset, | |
662 | ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED); | |
663 | return false; | |
664 | } | |
665 | ||
666 | reg = vgic_get_target_reg(vcpu->kvm, offset & ~3U); | |
667 | vgic_reg_access(mmio, ®, offset, | |
668 | ACCESS_READ_VALUE | ACCESS_WRITE_VALUE); | |
669 | if (mmio->is_write) { | |
670 | vgic_set_target_reg(vcpu->kvm, reg, offset & ~3U); | |
671 | vgic_update_state(vcpu->kvm); | |
672 | return true; | |
673 | } | |
674 | ||
675 | return false; | |
676 | } | |
677 | ||
678 | static u32 vgic_cfg_expand(u16 val) | |
679 | { | |
680 | u32 res = 0; | |
681 | int i; | |
682 | ||
683 | /* | |
684 | * Turn a 16bit value like abcd...mnop into a 32bit word | |
685 | * a0b0c0d0...m0n0o0p0, which is what the HW cfg register is. | |
686 | */ | |
687 | for (i = 0; i < 16; i++) | |
688 | res |= ((val >> i) & VGIC_CFG_EDGE) << (2 * i + 1); | |
689 | ||
690 | return res; | |
691 | } | |
692 | ||
693 | static u16 vgic_cfg_compress(u32 val) | |
694 | { | |
695 | u16 res = 0; | |
696 | int i; | |
697 | ||
698 | /* | |
699 | * Turn a 32bit word a0b0c0d0...m0n0o0p0 into 16bit value like | |
700 | * abcd...mnop which is what we really care about. | |
701 | */ | |
702 | for (i = 0; i < 16; i++) | |
703 | res |= ((val >> (i * 2 + 1)) & VGIC_CFG_EDGE) << i; | |
704 | ||
705 | return res; | |
706 | } | |
707 | ||
708 | /* | |
709 | * The distributor uses 2 bits per IRQ for the CFG register, but the | |
710 | * LSB is always 0. As such, we only keep the upper bit, and use the | |
711 | * two above functions to compress/expand the bits | |
712 | */ | |
713 | static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu, | |
714 | struct kvm_exit_mmio *mmio, phys_addr_t offset) | |
715 | { | |
716 | u32 val; | |
6545eae3 MZ |
717 | u32 *reg; |
718 | ||
6545eae3 | 719 | reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg, |
f2ae85b2 | 720 | vcpu->vcpu_id, offset >> 1); |
6545eae3 | 721 | |
f2ae85b2 | 722 | if (offset & 4) |
b47ef92a MZ |
723 | val = *reg >> 16; |
724 | else | |
725 | val = *reg & 0xffff; | |
726 | ||
727 | val = vgic_cfg_expand(val); | |
728 | vgic_reg_access(mmio, &val, offset, | |
729 | ACCESS_READ_VALUE | ACCESS_WRITE_VALUE); | |
730 | if (mmio->is_write) { | |
f2ae85b2 | 731 | if (offset < 8) { |
b47ef92a MZ |
732 | *reg = ~0U; /* Force PPIs/SGIs to 1 */ |
733 | return false; | |
734 | } | |
735 | ||
736 | val = vgic_cfg_compress(val); | |
f2ae85b2 | 737 | if (offset & 4) { |
b47ef92a MZ |
738 | *reg &= 0xffff; |
739 | *reg |= val << 16; | |
740 | } else { | |
741 | *reg &= 0xffff << 16; | |
742 | *reg |= val; | |
743 | } | |
744 | } | |
745 | ||
746 | return false; | |
747 | } | |
748 | ||
749 | static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu, | |
750 | struct kvm_exit_mmio *mmio, phys_addr_t offset) | |
751 | { | |
752 | u32 reg; | |
753 | vgic_reg_access(mmio, ®, offset, | |
754 | ACCESS_READ_RAZ | ACCESS_WRITE_VALUE); | |
755 | if (mmio->is_write) { | |
756 | vgic_dispatch_sgi(vcpu, reg); | |
757 | vgic_update_state(vcpu->kvm); | |
758 | return true; | |
759 | } | |
760 | ||
761 | return false; | |
762 | } | |
763 | ||
cbd333a4 CD |
764 | /** |
765 | * vgic_unqueue_irqs - move pending IRQs from LRs to the distributor | |
766 | * @vgic_cpu: Pointer to the vgic_cpu struct holding the LRs | |
767 | * | |
768 | * Move any pending IRQs that have already been assigned to LRs back to the | |
769 | * emulated distributor state so that the complete emulated state can be read | |
770 | * from the main emulation structures without investigating the LRs. | |
771 | * | |
772 | * Note that IRQs in the active state in the LRs get their pending state moved | |
773 | * to the distributor but the active state stays in the LRs, because we don't | |
774 | * track the active state on the distributor side. | |
775 | */ | |
776 | static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu) | |
777 | { | |
778 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
779 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
780 | int vcpu_id = vcpu->vcpu_id; | |
8d5c6b06 | 781 | int i; |
cbd333a4 CD |
782 | |
783 | for_each_set_bit(i, vgic_cpu->lr_used, vgic_cpu->nr_lr) { | |
8d5c6b06 | 784 | struct vgic_lr lr = vgic_get_lr(vcpu, i); |
cbd333a4 CD |
785 | |
786 | /* | |
787 | * There are three options for the state bits: | |
788 | * | |
789 | * 01: pending | |
790 | * 10: active | |
791 | * 11: pending and active | |
792 | * | |
793 | * If the LR holds only an active interrupt (not pending) then | |
794 | * just leave it alone. | |
795 | */ | |
8d5c6b06 | 796 | if ((lr.state & LR_STATE_MASK) == LR_STATE_ACTIVE) |
cbd333a4 CD |
797 | continue; |
798 | ||
799 | /* | |
800 | * Reestablish the pending state on the distributor and the | |
801 | * CPU interface. It may have already been pending, but that | |
802 | * is fine, then we are only setting a few bits that were | |
803 | * already set. | |
804 | */ | |
227844f5 | 805 | vgic_dist_irq_set_pending(vcpu, lr.irq); |
8d5c6b06 | 806 | if (lr.irq < VGIC_NR_SGIS) |
c1bfb577 | 807 | *vgic_get_sgi_sources(dist, vcpu_id, lr.irq) |= 1 << lr.source; |
8d5c6b06 MZ |
808 | lr.state &= ~LR_STATE_PENDING; |
809 | vgic_set_lr(vcpu, i, lr); | |
cbd333a4 CD |
810 | |
811 | /* | |
812 | * If there's no state left on the LR (it could still be | |
813 | * active), then the LR does not hold any useful info and can | |
814 | * be marked as free for other use. | |
815 | */ | |
cced50c9 | 816 | if (!(lr.state & LR_STATE_MASK)) { |
8d5c6b06 | 817 | vgic_retire_lr(i, lr.irq, vcpu); |
cced50c9 CD |
818 | vgic_irq_clear_queued(vcpu, lr.irq); |
819 | } | |
cbd333a4 CD |
820 | |
821 | /* Finally update the VGIC state. */ | |
822 | vgic_update_state(vcpu->kvm); | |
823 | } | |
824 | } | |
825 | ||
90a5355e CD |
826 | /* Handle reads of GICD_CPENDSGIRn and GICD_SPENDSGIRn */ |
827 | static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu, | |
828 | struct kvm_exit_mmio *mmio, | |
829 | phys_addr_t offset) | |
c07a0191 | 830 | { |
90a5355e CD |
831 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; |
832 | int sgi; | |
0fea6d76 | 833 | int min_sgi = (offset & ~0x3); |
90a5355e CD |
834 | int max_sgi = min_sgi + 3; |
835 | int vcpu_id = vcpu->vcpu_id; | |
836 | u32 reg = 0; | |
837 | ||
838 | /* Copy source SGIs from distributor side */ | |
839 | for (sgi = min_sgi; sgi <= max_sgi; sgi++) { | |
840 | int shift = 8 * (sgi - min_sgi); | |
c1bfb577 | 841 | reg |= ((u32)*vgic_get_sgi_sources(dist, vcpu_id, sgi)) << shift; |
90a5355e CD |
842 | } |
843 | ||
844 | mmio_data_write(mmio, ~0, reg); | |
c07a0191 CD |
845 | return false; |
846 | } | |
847 | ||
90a5355e CD |
848 | static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu, |
849 | struct kvm_exit_mmio *mmio, | |
850 | phys_addr_t offset, bool set) | |
851 | { | |
852 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
853 | int sgi; | |
0fea6d76 | 854 | int min_sgi = (offset & ~0x3); |
90a5355e CD |
855 | int max_sgi = min_sgi + 3; |
856 | int vcpu_id = vcpu->vcpu_id; | |
857 | u32 reg; | |
858 | bool updated = false; | |
859 | ||
860 | reg = mmio_data_read(mmio, ~0); | |
861 | ||
862 | /* Clear pending SGIs on the distributor */ | |
863 | for (sgi = min_sgi; sgi <= max_sgi; sgi++) { | |
864 | u8 mask = reg >> (8 * (sgi - min_sgi)); | |
c1bfb577 | 865 | u8 *src = vgic_get_sgi_sources(dist, vcpu_id, sgi); |
90a5355e | 866 | if (set) { |
c1bfb577 | 867 | if ((*src & mask) != mask) |
90a5355e | 868 | updated = true; |
c1bfb577 | 869 | *src |= mask; |
90a5355e | 870 | } else { |
c1bfb577 | 871 | if (*src & mask) |
90a5355e | 872 | updated = true; |
c1bfb577 | 873 | *src &= ~mask; |
90a5355e CD |
874 | } |
875 | } | |
876 | ||
877 | if (updated) | |
878 | vgic_update_state(vcpu->kvm); | |
879 | ||
880 | return updated; | |
881 | } | |
882 | ||
c07a0191 CD |
883 | static bool handle_mmio_sgi_set(struct kvm_vcpu *vcpu, |
884 | struct kvm_exit_mmio *mmio, | |
885 | phys_addr_t offset) | |
886 | { | |
90a5355e CD |
887 | if (!mmio->is_write) |
888 | return read_set_clear_sgi_pend_reg(vcpu, mmio, offset); | |
889 | else | |
890 | return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, true); | |
891 | } | |
892 | ||
893 | static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu, | |
894 | struct kvm_exit_mmio *mmio, | |
895 | phys_addr_t offset) | |
896 | { | |
897 | if (!mmio->is_write) | |
898 | return read_set_clear_sgi_pend_reg(vcpu, mmio, offset); | |
899 | else | |
900 | return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false); | |
c07a0191 CD |
901 | } |
902 | ||
1a89dd91 MZ |
903 | /* |
904 | * I would have liked to use the kvm_bus_io_*() API instead, but it | |
905 | * cannot cope with banked registers (only the VM pointer is passed | |
906 | * around, and we need the vcpu). One of these days, someone please | |
907 | * fix it! | |
908 | */ | |
909 | struct mmio_range { | |
910 | phys_addr_t base; | |
911 | unsigned long len; | |
c3c91836 | 912 | int bits_per_irq; |
1a89dd91 MZ |
913 | bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio, |
914 | phys_addr_t offset); | |
915 | }; | |
916 | ||
1006e8cb | 917 | static const struct mmio_range vgic_dist_ranges[] = { |
b47ef92a MZ |
918 | { |
919 | .base = GIC_DIST_CTRL, | |
920 | .len = 12, | |
c3c91836 | 921 | .bits_per_irq = 0, |
b47ef92a MZ |
922 | .handle_mmio = handle_mmio_misc, |
923 | }, | |
924 | { | |
925 | .base = GIC_DIST_IGROUP, | |
c3c91836 MZ |
926 | .len = VGIC_MAX_IRQS / 8, |
927 | .bits_per_irq = 1, | |
b47ef92a MZ |
928 | .handle_mmio = handle_mmio_raz_wi, |
929 | }, | |
930 | { | |
931 | .base = GIC_DIST_ENABLE_SET, | |
c3c91836 MZ |
932 | .len = VGIC_MAX_IRQS / 8, |
933 | .bits_per_irq = 1, | |
b47ef92a MZ |
934 | .handle_mmio = handle_mmio_set_enable_reg, |
935 | }, | |
936 | { | |
937 | .base = GIC_DIST_ENABLE_CLEAR, | |
c3c91836 MZ |
938 | .len = VGIC_MAX_IRQS / 8, |
939 | .bits_per_irq = 1, | |
b47ef92a MZ |
940 | .handle_mmio = handle_mmio_clear_enable_reg, |
941 | }, | |
942 | { | |
943 | .base = GIC_DIST_PENDING_SET, | |
c3c91836 MZ |
944 | .len = VGIC_MAX_IRQS / 8, |
945 | .bits_per_irq = 1, | |
b47ef92a MZ |
946 | .handle_mmio = handle_mmio_set_pending_reg, |
947 | }, | |
948 | { | |
949 | .base = GIC_DIST_PENDING_CLEAR, | |
c3c91836 MZ |
950 | .len = VGIC_MAX_IRQS / 8, |
951 | .bits_per_irq = 1, | |
b47ef92a MZ |
952 | .handle_mmio = handle_mmio_clear_pending_reg, |
953 | }, | |
954 | { | |
955 | .base = GIC_DIST_ACTIVE_SET, | |
c3c91836 MZ |
956 | .len = VGIC_MAX_IRQS / 8, |
957 | .bits_per_irq = 1, | |
b47ef92a MZ |
958 | .handle_mmio = handle_mmio_raz_wi, |
959 | }, | |
960 | { | |
961 | .base = GIC_DIST_ACTIVE_CLEAR, | |
c3c91836 MZ |
962 | .len = VGIC_MAX_IRQS / 8, |
963 | .bits_per_irq = 1, | |
b47ef92a MZ |
964 | .handle_mmio = handle_mmio_raz_wi, |
965 | }, | |
966 | { | |
967 | .base = GIC_DIST_PRI, | |
c3c91836 MZ |
968 | .len = VGIC_MAX_IRQS, |
969 | .bits_per_irq = 8, | |
b47ef92a MZ |
970 | .handle_mmio = handle_mmio_priority_reg, |
971 | }, | |
972 | { | |
973 | .base = GIC_DIST_TARGET, | |
c3c91836 MZ |
974 | .len = VGIC_MAX_IRQS, |
975 | .bits_per_irq = 8, | |
b47ef92a MZ |
976 | .handle_mmio = handle_mmio_target_reg, |
977 | }, | |
978 | { | |
979 | .base = GIC_DIST_CONFIG, | |
c3c91836 MZ |
980 | .len = VGIC_MAX_IRQS / 4, |
981 | .bits_per_irq = 2, | |
b47ef92a MZ |
982 | .handle_mmio = handle_mmio_cfg_reg, |
983 | }, | |
984 | { | |
985 | .base = GIC_DIST_SOFTINT, | |
986 | .len = 4, | |
987 | .handle_mmio = handle_mmio_sgi_reg, | |
988 | }, | |
c07a0191 CD |
989 | { |
990 | .base = GIC_DIST_SGI_PENDING_CLEAR, | |
991 | .len = VGIC_NR_SGIS, | |
992 | .handle_mmio = handle_mmio_sgi_clear, | |
993 | }, | |
994 | { | |
995 | .base = GIC_DIST_SGI_PENDING_SET, | |
996 | .len = VGIC_NR_SGIS, | |
997 | .handle_mmio = handle_mmio_sgi_set, | |
998 | }, | |
1a89dd91 MZ |
999 | {} |
1000 | }; | |
1001 | ||
1002 | static const | |
1003 | struct mmio_range *find_matching_range(const struct mmio_range *ranges, | |
1004 | struct kvm_exit_mmio *mmio, | |
1006e8cb | 1005 | phys_addr_t offset) |
1a89dd91 MZ |
1006 | { |
1007 | const struct mmio_range *r = ranges; | |
1a89dd91 MZ |
1008 | |
1009 | while (r->len) { | |
1006e8cb CD |
1010 | if (offset >= r->base && |
1011 | (offset + mmio->len) <= (r->base + r->len)) | |
1a89dd91 MZ |
1012 | return r; |
1013 | r++; | |
1014 | } | |
1015 | ||
1016 | return NULL; | |
1017 | } | |
1018 | ||
c3c91836 MZ |
1019 | static bool vgic_validate_access(const struct vgic_dist *dist, |
1020 | const struct mmio_range *range, | |
1021 | unsigned long offset) | |
1022 | { | |
1023 | int irq; | |
1024 | ||
1025 | if (!range->bits_per_irq) | |
1026 | return true; /* Not an irq-based access */ | |
1027 | ||
1028 | irq = offset * 8 / range->bits_per_irq; | |
1029 | if (irq >= dist->nr_irqs) | |
1030 | return false; | |
1031 | ||
1032 | return true; | |
1033 | } | |
1034 | ||
1a89dd91 MZ |
1035 | /** |
1036 | * vgic_handle_mmio - handle an in-kernel MMIO access | |
1037 | * @vcpu: pointer to the vcpu performing the access | |
1038 | * @run: pointer to the kvm_run structure | |
1039 | * @mmio: pointer to the data describing the access | |
1040 | * | |
1041 | * returns true if the MMIO access has been performed in kernel space, | |
1042 | * and false if it needs to be emulated in user space. | |
1043 | */ | |
1044 | bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
1045 | struct kvm_exit_mmio *mmio) | |
1046 | { | |
b47ef92a MZ |
1047 | const struct mmio_range *range; |
1048 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
1049 | unsigned long base = dist->vgic_dist_base; | |
1050 | bool updated_state; | |
1051 | unsigned long offset; | |
1052 | ||
1053 | if (!irqchip_in_kernel(vcpu->kvm) || | |
1054 | mmio->phys_addr < base || | |
1055 | (mmio->phys_addr + mmio->len) > (base + KVM_VGIC_V2_DIST_SIZE)) | |
1056 | return false; | |
1057 | ||
1058 | /* We don't support ldrd / strd or ldm / stm to the emulated vgic */ | |
1059 | if (mmio->len > 4) { | |
1060 | kvm_inject_dabt(vcpu, mmio->phys_addr); | |
1061 | return true; | |
1062 | } | |
1063 | ||
1006e8cb CD |
1064 | offset = mmio->phys_addr - base; |
1065 | range = find_matching_range(vgic_dist_ranges, mmio, offset); | |
b47ef92a MZ |
1066 | if (unlikely(!range || !range->handle_mmio)) { |
1067 | pr_warn("Unhandled access %d %08llx %d\n", | |
1068 | mmio->is_write, mmio->phys_addr, mmio->len); | |
1069 | return false; | |
1070 | } | |
1071 | ||
1072 | spin_lock(&vcpu->kvm->arch.vgic.lock); | |
1073 | offset = mmio->phys_addr - range->base - base; | |
c3c91836 MZ |
1074 | if (vgic_validate_access(dist, range, offset)) { |
1075 | updated_state = range->handle_mmio(vcpu, mmio, offset); | |
1076 | } else { | |
1077 | vgic_reg_access(mmio, NULL, offset, | |
1078 | ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED); | |
1079 | updated_state = false; | |
1080 | } | |
b47ef92a MZ |
1081 | spin_unlock(&vcpu->kvm->arch.vgic.lock); |
1082 | kvm_prepare_mmio(run, mmio); | |
1083 | kvm_handle_mmio_return(vcpu, run); | |
1084 | ||
5863c2ce MZ |
1085 | if (updated_state) |
1086 | vgic_kick_vcpus(vcpu->kvm); | |
1087 | ||
b47ef92a MZ |
1088 | return true; |
1089 | } | |
1090 | ||
c1bfb577 MZ |
1091 | static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi) |
1092 | { | |
1093 | return dist->irq_sgi_sources + vcpu_id * VGIC_NR_SGIS + sgi; | |
1094 | } | |
1095 | ||
b47ef92a MZ |
1096 | static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg) |
1097 | { | |
1098 | struct kvm *kvm = vcpu->kvm; | |
1099 | struct vgic_dist *dist = &kvm->arch.vgic; | |
1100 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
1101 | u8 target_cpus; | |
1102 | int sgi, mode, c, vcpu_id; | |
1103 | ||
1104 | vcpu_id = vcpu->vcpu_id; | |
1105 | ||
1106 | sgi = reg & 0xf; | |
1107 | target_cpus = (reg >> 16) & 0xff; | |
1108 | mode = (reg >> 24) & 3; | |
1109 | ||
1110 | switch (mode) { | |
1111 | case 0: | |
1112 | if (!target_cpus) | |
1113 | return; | |
91021a6c | 1114 | break; |
b47ef92a MZ |
1115 | |
1116 | case 1: | |
1117 | target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff; | |
1118 | break; | |
1119 | ||
1120 | case 2: | |
1121 | target_cpus = 1 << vcpu_id; | |
1122 | break; | |
1123 | } | |
1124 | ||
1125 | kvm_for_each_vcpu(c, vcpu, kvm) { | |
1126 | if (target_cpus & 1) { | |
1127 | /* Flag the SGI as pending */ | |
227844f5 | 1128 | vgic_dist_irq_set_pending(vcpu, sgi); |
c1bfb577 | 1129 | *vgic_get_sgi_sources(dist, c, sgi) |= 1 << vcpu_id; |
b47ef92a MZ |
1130 | kvm_debug("SGI%d from CPU%d to CPU%d\n", sgi, vcpu_id, c); |
1131 | } | |
1132 | ||
1133 | target_cpus >>= 1; | |
1134 | } | |
1135 | } | |
1136 | ||
fb65ab63 MZ |
1137 | static int vgic_nr_shared_irqs(struct vgic_dist *dist) |
1138 | { | |
1139 | return dist->nr_irqs - VGIC_NR_PRIVATE_IRQS; | |
1140 | } | |
1141 | ||
b47ef92a MZ |
1142 | static int compute_pending_for_cpu(struct kvm_vcpu *vcpu) |
1143 | { | |
9d949dce MZ |
1144 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; |
1145 | unsigned long *pending, *enabled, *pend_percpu, *pend_shared; | |
1146 | unsigned long pending_private, pending_shared; | |
fb65ab63 | 1147 | int nr_shared = vgic_nr_shared_irqs(dist); |
9d949dce MZ |
1148 | int vcpu_id; |
1149 | ||
1150 | vcpu_id = vcpu->vcpu_id; | |
1151 | pend_percpu = vcpu->arch.vgic_cpu.pending_percpu; | |
1152 | pend_shared = vcpu->arch.vgic_cpu.pending_shared; | |
1153 | ||
227844f5 | 1154 | pending = vgic_bitmap_get_cpu_map(&dist->irq_pending, vcpu_id); |
9d949dce MZ |
1155 | enabled = vgic_bitmap_get_cpu_map(&dist->irq_enabled, vcpu_id); |
1156 | bitmap_and(pend_percpu, pending, enabled, VGIC_NR_PRIVATE_IRQS); | |
1157 | ||
227844f5 | 1158 | pending = vgic_bitmap_get_shared_map(&dist->irq_pending); |
9d949dce | 1159 | enabled = vgic_bitmap_get_shared_map(&dist->irq_enabled); |
fb65ab63 | 1160 | bitmap_and(pend_shared, pending, enabled, nr_shared); |
9d949dce MZ |
1161 | bitmap_and(pend_shared, pend_shared, |
1162 | vgic_bitmap_get_shared_map(&dist->irq_spi_target[vcpu_id]), | |
fb65ab63 | 1163 | nr_shared); |
9d949dce MZ |
1164 | |
1165 | pending_private = find_first_bit(pend_percpu, VGIC_NR_PRIVATE_IRQS); | |
fb65ab63 | 1166 | pending_shared = find_first_bit(pend_shared, nr_shared); |
9d949dce | 1167 | return (pending_private < VGIC_NR_PRIVATE_IRQS || |
fb65ab63 | 1168 | pending_shared < vgic_nr_shared_irqs(dist)); |
b47ef92a MZ |
1169 | } |
1170 | ||
1171 | /* | |
1172 | * Update the interrupt state and determine which CPUs have pending | |
1173 | * interrupts. Must be called with distributor lock held. | |
1174 | */ | |
1175 | static void vgic_update_state(struct kvm *kvm) | |
1176 | { | |
1177 | struct vgic_dist *dist = &kvm->arch.vgic; | |
1178 | struct kvm_vcpu *vcpu; | |
1179 | int c; | |
1180 | ||
1181 | if (!dist->enabled) { | |
c1bfb577 | 1182 | set_bit(0, dist->irq_pending_on_cpu); |
b47ef92a MZ |
1183 | return; |
1184 | } | |
1185 | ||
1186 | kvm_for_each_vcpu(c, vcpu, kvm) { | |
1187 | if (compute_pending_for_cpu(vcpu)) { | |
1188 | pr_debug("CPU%d has pending interrupts\n", c); | |
c1bfb577 | 1189 | set_bit(c, dist->irq_pending_on_cpu); |
b47ef92a MZ |
1190 | } |
1191 | } | |
1a89dd91 | 1192 | } |
330690cd | 1193 | |
8d5c6b06 MZ |
1194 | static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr) |
1195 | { | |
8f186d52 | 1196 | return vgic_ops->get_lr(vcpu, lr); |
8d5c6b06 MZ |
1197 | } |
1198 | ||
1199 | static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, | |
1200 | struct vgic_lr vlr) | |
1201 | { | |
8f186d52 | 1202 | vgic_ops->set_lr(vcpu, lr, vlr); |
8d5c6b06 MZ |
1203 | } |
1204 | ||
69bb2c9f MZ |
1205 | static void vgic_sync_lr_elrsr(struct kvm_vcpu *vcpu, int lr, |
1206 | struct vgic_lr vlr) | |
1207 | { | |
8f186d52 | 1208 | vgic_ops->sync_lr_elrsr(vcpu, lr, vlr); |
69bb2c9f MZ |
1209 | } |
1210 | ||
1211 | static inline u64 vgic_get_elrsr(struct kvm_vcpu *vcpu) | |
1212 | { | |
8f186d52 | 1213 | return vgic_ops->get_elrsr(vcpu); |
69bb2c9f MZ |
1214 | } |
1215 | ||
8d6a0313 MZ |
1216 | static inline u64 vgic_get_eisr(struct kvm_vcpu *vcpu) |
1217 | { | |
8f186d52 | 1218 | return vgic_ops->get_eisr(vcpu); |
8d6a0313 MZ |
1219 | } |
1220 | ||
495dd859 MZ |
1221 | static inline u32 vgic_get_interrupt_status(struct kvm_vcpu *vcpu) |
1222 | { | |
8f186d52 | 1223 | return vgic_ops->get_interrupt_status(vcpu); |
495dd859 MZ |
1224 | } |
1225 | ||
909d9b50 MZ |
1226 | static inline void vgic_enable_underflow(struct kvm_vcpu *vcpu) |
1227 | { | |
8f186d52 | 1228 | vgic_ops->enable_underflow(vcpu); |
909d9b50 MZ |
1229 | } |
1230 | ||
1231 | static inline void vgic_disable_underflow(struct kvm_vcpu *vcpu) | |
1232 | { | |
8f186d52 | 1233 | vgic_ops->disable_underflow(vcpu); |
909d9b50 MZ |
1234 | } |
1235 | ||
beee38b9 MZ |
1236 | static inline void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr) |
1237 | { | |
8f186d52 | 1238 | vgic_ops->get_vmcr(vcpu, vmcr); |
beee38b9 MZ |
1239 | } |
1240 | ||
1241 | static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr) | |
1242 | { | |
8f186d52 | 1243 | vgic_ops->set_vmcr(vcpu, vmcr); |
beee38b9 MZ |
1244 | } |
1245 | ||
da8dafd1 MZ |
1246 | static inline void vgic_enable(struct kvm_vcpu *vcpu) |
1247 | { | |
8f186d52 | 1248 | vgic_ops->enable(vcpu); |
da8dafd1 MZ |
1249 | } |
1250 | ||
8d5c6b06 MZ |
1251 | static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu) |
1252 | { | |
1253 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1254 | struct vgic_lr vlr = vgic_get_lr(vcpu, lr_nr); | |
1255 | ||
1256 | vlr.state = 0; | |
1257 | vgic_set_lr(vcpu, lr_nr, vlr); | |
1258 | clear_bit(lr_nr, vgic_cpu->lr_used); | |
1259 | vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY; | |
1260 | } | |
a1fcb44e MZ |
1261 | |
1262 | /* | |
1263 | * An interrupt may have been disabled after being made pending on the | |
1264 | * CPU interface (the classic case is a timer running while we're | |
1265 | * rebooting the guest - the interrupt would kick as soon as the CPU | |
1266 | * interface gets enabled, with deadly consequences). | |
1267 | * | |
1268 | * The solution is to examine already active LRs, and check the | |
1269 | * interrupt is still enabled. If not, just retire it. | |
1270 | */ | |
1271 | static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu) | |
1272 | { | |
1273 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1274 | int lr; | |
1275 | ||
8f186d52 | 1276 | for_each_set_bit(lr, vgic_cpu->lr_used, vgic->nr_lr) { |
8d5c6b06 | 1277 | struct vgic_lr vlr = vgic_get_lr(vcpu, lr); |
a1fcb44e | 1278 | |
8d5c6b06 MZ |
1279 | if (!vgic_irq_is_enabled(vcpu, vlr.irq)) { |
1280 | vgic_retire_lr(lr, vlr.irq, vcpu); | |
dbf20f9d CD |
1281 | if (vgic_irq_is_queued(vcpu, vlr.irq)) |
1282 | vgic_irq_clear_queued(vcpu, vlr.irq); | |
a1fcb44e MZ |
1283 | } |
1284 | } | |
1285 | } | |
1286 | ||
9d949dce MZ |
1287 | /* |
1288 | * Queue an interrupt to a CPU virtual interface. Return true on success, | |
1289 | * or false if it wasn't possible to queue it. | |
1290 | */ | |
1291 | static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq) | |
1292 | { | |
1293 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
5fb66da6 | 1294 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; |
8d5c6b06 | 1295 | struct vgic_lr vlr; |
9d949dce MZ |
1296 | int lr; |
1297 | ||
1298 | /* Sanitize the input... */ | |
1299 | BUG_ON(sgi_source_id & ~7); | |
1300 | BUG_ON(sgi_source_id && irq >= VGIC_NR_SGIS); | |
5fb66da6 | 1301 | BUG_ON(irq >= dist->nr_irqs); |
9d949dce MZ |
1302 | |
1303 | kvm_debug("Queue IRQ%d\n", irq); | |
1304 | ||
1305 | lr = vgic_cpu->vgic_irq_lr_map[irq]; | |
1306 | ||
1307 | /* Do we have an active interrupt for the same CPUID? */ | |
8d5c6b06 MZ |
1308 | if (lr != LR_EMPTY) { |
1309 | vlr = vgic_get_lr(vcpu, lr); | |
1310 | if (vlr.source == sgi_source_id) { | |
1311 | kvm_debug("LR%d piggyback for IRQ%d\n", lr, vlr.irq); | |
1312 | BUG_ON(!test_bit(lr, vgic_cpu->lr_used)); | |
1313 | vlr.state |= LR_STATE_PENDING; | |
1314 | vgic_set_lr(vcpu, lr, vlr); | |
1315 | return true; | |
1316 | } | |
9d949dce MZ |
1317 | } |
1318 | ||
1319 | /* Try to use another LR for this interrupt */ | |
1320 | lr = find_first_zero_bit((unsigned long *)vgic_cpu->lr_used, | |
8f186d52 MZ |
1321 | vgic->nr_lr); |
1322 | if (lr >= vgic->nr_lr) | |
9d949dce MZ |
1323 | return false; |
1324 | ||
1325 | kvm_debug("LR%d allocated for IRQ%d %x\n", lr, irq, sgi_source_id); | |
9d949dce MZ |
1326 | vgic_cpu->vgic_irq_lr_map[irq] = lr; |
1327 | set_bit(lr, vgic_cpu->lr_used); | |
1328 | ||
8d5c6b06 MZ |
1329 | vlr.irq = irq; |
1330 | vlr.source = sgi_source_id; | |
1331 | vlr.state = LR_STATE_PENDING; | |
9d949dce | 1332 | if (!vgic_irq_is_edge(vcpu, irq)) |
8d5c6b06 MZ |
1333 | vlr.state |= LR_EOI_INT; |
1334 | ||
1335 | vgic_set_lr(vcpu, lr, vlr); | |
9d949dce MZ |
1336 | |
1337 | return true; | |
1338 | } | |
1339 | ||
1340 | static bool vgic_queue_sgi(struct kvm_vcpu *vcpu, int irq) | |
1341 | { | |
1342 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
1343 | unsigned long sources; | |
1344 | int vcpu_id = vcpu->vcpu_id; | |
1345 | int c; | |
1346 | ||
c1bfb577 | 1347 | sources = *vgic_get_sgi_sources(dist, vcpu_id, irq); |
9d949dce | 1348 | |
fc675e35 | 1349 | for_each_set_bit(c, &sources, dist->nr_cpus) { |
9d949dce MZ |
1350 | if (vgic_queue_irq(vcpu, c, irq)) |
1351 | clear_bit(c, &sources); | |
1352 | } | |
1353 | ||
c1bfb577 | 1354 | *vgic_get_sgi_sources(dist, vcpu_id, irq) = sources; |
9d949dce MZ |
1355 | |
1356 | /* | |
1357 | * If the sources bitmap has been cleared it means that we | |
1358 | * could queue all the SGIs onto link registers (see the | |
1359 | * clear_bit above), and therefore we are done with them in | |
1360 | * our emulated gic and can get rid of them. | |
1361 | */ | |
1362 | if (!sources) { | |
227844f5 | 1363 | vgic_dist_irq_clear_pending(vcpu, irq); |
9d949dce MZ |
1364 | vgic_cpu_irq_clear(vcpu, irq); |
1365 | return true; | |
1366 | } | |
1367 | ||
1368 | return false; | |
1369 | } | |
1370 | ||
1371 | static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq) | |
1372 | { | |
dbf20f9d | 1373 | if (!vgic_can_sample_irq(vcpu, irq)) |
9d949dce MZ |
1374 | return true; /* level interrupt, already queued */ |
1375 | ||
1376 | if (vgic_queue_irq(vcpu, 0, irq)) { | |
1377 | if (vgic_irq_is_edge(vcpu, irq)) { | |
227844f5 | 1378 | vgic_dist_irq_clear_pending(vcpu, irq); |
9d949dce MZ |
1379 | vgic_cpu_irq_clear(vcpu, irq); |
1380 | } else { | |
dbf20f9d | 1381 | vgic_irq_set_queued(vcpu, irq); |
9d949dce MZ |
1382 | } |
1383 | ||
1384 | return true; | |
1385 | } | |
1386 | ||
1387 | return false; | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Fill the list registers with pending interrupts before running the | |
1392 | * guest. | |
1393 | */ | |
1394 | static void __kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) | |
1395 | { | |
1396 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1397 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
1398 | int i, vcpu_id; | |
1399 | int overflow = 0; | |
1400 | ||
1401 | vcpu_id = vcpu->vcpu_id; | |
1402 | ||
1403 | /* | |
1404 | * We may not have any pending interrupt, or the interrupts | |
1405 | * may have been serviced from another vcpu. In all cases, | |
1406 | * move along. | |
1407 | */ | |
1408 | if (!kvm_vgic_vcpu_pending_irq(vcpu)) { | |
1409 | pr_debug("CPU%d has no pending interrupt\n", vcpu_id); | |
1410 | goto epilog; | |
1411 | } | |
1412 | ||
1413 | /* SGIs */ | |
1414 | for_each_set_bit(i, vgic_cpu->pending_percpu, VGIC_NR_SGIS) { | |
1415 | if (!vgic_queue_sgi(vcpu, i)) | |
1416 | overflow = 1; | |
1417 | } | |
1418 | ||
1419 | /* PPIs */ | |
1420 | for_each_set_bit_from(i, vgic_cpu->pending_percpu, VGIC_NR_PRIVATE_IRQS) { | |
1421 | if (!vgic_queue_hwirq(vcpu, i)) | |
1422 | overflow = 1; | |
1423 | } | |
1424 | ||
1425 | /* SPIs */ | |
fb65ab63 | 1426 | for_each_set_bit(i, vgic_cpu->pending_shared, vgic_nr_shared_irqs(dist)) { |
9d949dce MZ |
1427 | if (!vgic_queue_hwirq(vcpu, i + VGIC_NR_PRIVATE_IRQS)) |
1428 | overflow = 1; | |
1429 | } | |
1430 | ||
1431 | epilog: | |
1432 | if (overflow) { | |
909d9b50 | 1433 | vgic_enable_underflow(vcpu); |
9d949dce | 1434 | } else { |
909d9b50 | 1435 | vgic_disable_underflow(vcpu); |
9d949dce MZ |
1436 | /* |
1437 | * We're about to run this VCPU, and we've consumed | |
1438 | * everything the distributor had in store for | |
1439 | * us. Claim we don't have anything pending. We'll | |
1440 | * adjust that if needed while exiting. | |
1441 | */ | |
c1bfb577 | 1442 | clear_bit(vcpu_id, dist->irq_pending_on_cpu); |
9d949dce MZ |
1443 | } |
1444 | } | |
1445 | ||
1446 | static bool vgic_process_maintenance(struct kvm_vcpu *vcpu) | |
1447 | { | |
495dd859 | 1448 | u32 status = vgic_get_interrupt_status(vcpu); |
9d949dce MZ |
1449 | bool level_pending = false; |
1450 | ||
495dd859 | 1451 | kvm_debug("STATUS = %08x\n", status); |
9d949dce | 1452 | |
495dd859 | 1453 | if (status & INT_STATUS_EOI) { |
9d949dce MZ |
1454 | /* |
1455 | * Some level interrupts have been EOIed. Clear their | |
1456 | * active bit. | |
1457 | */ | |
8d6a0313 | 1458 | u64 eisr = vgic_get_eisr(vcpu); |
2df36a5d | 1459 | unsigned long *eisr_ptr = u64_to_bitmask(&eisr); |
8d5c6b06 | 1460 | int lr; |
9d949dce | 1461 | |
8f186d52 | 1462 | for_each_set_bit(lr, eisr_ptr, vgic->nr_lr) { |
8d5c6b06 | 1463 | struct vgic_lr vlr = vgic_get_lr(vcpu, lr); |
faa1b46c | 1464 | WARN_ON(vgic_irq_is_edge(vcpu, vlr.irq)); |
9d949dce | 1465 | |
dbf20f9d | 1466 | vgic_irq_clear_queued(vcpu, vlr.irq); |
8d5c6b06 MZ |
1467 | WARN_ON(vlr.state & LR_STATE_MASK); |
1468 | vlr.state = 0; | |
1469 | vgic_set_lr(vcpu, lr, vlr); | |
9d949dce | 1470 | |
faa1b46c CD |
1471 | /* |
1472 | * If the IRQ was EOIed it was also ACKed and we we | |
1473 | * therefore assume we can clear the soft pending | |
1474 | * state (should it had been set) for this interrupt. | |
1475 | * | |
1476 | * Note: if the IRQ soft pending state was set after | |
1477 | * the IRQ was acked, it actually shouldn't be | |
1478 | * cleared, but we have no way of knowing that unless | |
1479 | * we start trapping ACKs when the soft-pending state | |
1480 | * is set. | |
1481 | */ | |
1482 | vgic_dist_irq_clear_soft_pend(vcpu, vlr.irq); | |
1483 | ||
9d949dce | 1484 | /* Any additional pending interrupt? */ |
faa1b46c | 1485 | if (vgic_dist_irq_get_level(vcpu, vlr.irq)) { |
8d5c6b06 | 1486 | vgic_cpu_irq_set(vcpu, vlr.irq); |
9d949dce MZ |
1487 | level_pending = true; |
1488 | } else { | |
faa1b46c | 1489 | vgic_dist_irq_clear_pending(vcpu, vlr.irq); |
8d5c6b06 | 1490 | vgic_cpu_irq_clear(vcpu, vlr.irq); |
9d949dce | 1491 | } |
75da01e1 MZ |
1492 | |
1493 | /* | |
1494 | * Despite being EOIed, the LR may not have | |
1495 | * been marked as empty. | |
1496 | */ | |
69bb2c9f | 1497 | vgic_sync_lr_elrsr(vcpu, lr, vlr); |
9d949dce MZ |
1498 | } |
1499 | } | |
1500 | ||
495dd859 | 1501 | if (status & INT_STATUS_UNDERFLOW) |
909d9b50 | 1502 | vgic_disable_underflow(vcpu); |
9d949dce MZ |
1503 | |
1504 | return level_pending; | |
1505 | } | |
1506 | ||
1507 | /* | |
33c83cb3 MZ |
1508 | * Sync back the VGIC state after a guest run. The distributor lock is |
1509 | * needed so we don't get preempted in the middle of the state processing. | |
9d949dce MZ |
1510 | */ |
1511 | static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) | |
1512 | { | |
1513 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1514 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
69bb2c9f MZ |
1515 | u64 elrsr; |
1516 | unsigned long *elrsr_ptr; | |
9d949dce MZ |
1517 | int lr, pending; |
1518 | bool level_pending; | |
1519 | ||
1520 | level_pending = vgic_process_maintenance(vcpu); | |
69bb2c9f | 1521 | elrsr = vgic_get_elrsr(vcpu); |
2df36a5d | 1522 | elrsr_ptr = u64_to_bitmask(&elrsr); |
9d949dce MZ |
1523 | |
1524 | /* Clear mappings for empty LRs */ | |
8f186d52 | 1525 | for_each_set_bit(lr, elrsr_ptr, vgic->nr_lr) { |
8d5c6b06 | 1526 | struct vgic_lr vlr; |
9d949dce MZ |
1527 | |
1528 | if (!test_and_clear_bit(lr, vgic_cpu->lr_used)) | |
1529 | continue; | |
1530 | ||
8d5c6b06 | 1531 | vlr = vgic_get_lr(vcpu, lr); |
9d949dce | 1532 | |
5fb66da6 | 1533 | BUG_ON(vlr.irq >= dist->nr_irqs); |
8d5c6b06 | 1534 | vgic_cpu->vgic_irq_lr_map[vlr.irq] = LR_EMPTY; |
9d949dce MZ |
1535 | } |
1536 | ||
1537 | /* Check if we still have something up our sleeve... */ | |
8f186d52 MZ |
1538 | pending = find_first_zero_bit(elrsr_ptr, vgic->nr_lr); |
1539 | if (level_pending || pending < vgic->nr_lr) | |
c1bfb577 | 1540 | set_bit(vcpu->vcpu_id, dist->irq_pending_on_cpu); |
9d949dce MZ |
1541 | } |
1542 | ||
1543 | void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) | |
1544 | { | |
1545 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
1546 | ||
1547 | if (!irqchip_in_kernel(vcpu->kvm)) | |
1548 | return; | |
1549 | ||
1550 | spin_lock(&dist->lock); | |
1551 | __kvm_vgic_flush_hwstate(vcpu); | |
1552 | spin_unlock(&dist->lock); | |
1553 | } | |
1554 | ||
1555 | void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) | |
1556 | { | |
33c83cb3 MZ |
1557 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; |
1558 | ||
9d949dce MZ |
1559 | if (!irqchip_in_kernel(vcpu->kvm)) |
1560 | return; | |
1561 | ||
33c83cb3 | 1562 | spin_lock(&dist->lock); |
9d949dce | 1563 | __kvm_vgic_sync_hwstate(vcpu); |
33c83cb3 | 1564 | spin_unlock(&dist->lock); |
9d949dce MZ |
1565 | } |
1566 | ||
1567 | int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu) | |
1568 | { | |
1569 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
1570 | ||
1571 | if (!irqchip_in_kernel(vcpu->kvm)) | |
1572 | return 0; | |
1573 | ||
c1bfb577 | 1574 | return test_bit(vcpu->vcpu_id, dist->irq_pending_on_cpu); |
9d949dce MZ |
1575 | } |
1576 | ||
5863c2ce MZ |
1577 | static void vgic_kick_vcpus(struct kvm *kvm) |
1578 | { | |
1579 | struct kvm_vcpu *vcpu; | |
1580 | int c; | |
1581 | ||
1582 | /* | |
1583 | * We've injected an interrupt, time to find out who deserves | |
1584 | * a good kick... | |
1585 | */ | |
1586 | kvm_for_each_vcpu(c, vcpu, kvm) { | |
1587 | if (kvm_vgic_vcpu_pending_irq(vcpu)) | |
1588 | kvm_vcpu_kick(vcpu); | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | static int vgic_validate_injection(struct kvm_vcpu *vcpu, int irq, int level) | |
1593 | { | |
227844f5 | 1594 | int edge_triggered = vgic_irq_is_edge(vcpu, irq); |
5863c2ce MZ |
1595 | |
1596 | /* | |
1597 | * Only inject an interrupt if: | |
1598 | * - edge triggered and we have a rising edge | |
1599 | * - level triggered and we change level | |
1600 | */ | |
faa1b46c CD |
1601 | if (edge_triggered) { |
1602 | int state = vgic_dist_irq_is_pending(vcpu, irq); | |
5863c2ce | 1603 | return level > state; |
faa1b46c CD |
1604 | } else { |
1605 | int state = vgic_dist_irq_get_level(vcpu, irq); | |
5863c2ce | 1606 | return level != state; |
faa1b46c | 1607 | } |
5863c2ce MZ |
1608 | } |
1609 | ||
227844f5 | 1610 | static bool vgic_update_irq_pending(struct kvm *kvm, int cpuid, |
5863c2ce MZ |
1611 | unsigned int irq_num, bool level) |
1612 | { | |
1613 | struct vgic_dist *dist = &kvm->arch.vgic; | |
1614 | struct kvm_vcpu *vcpu; | |
227844f5 | 1615 | int edge_triggered, level_triggered; |
5863c2ce MZ |
1616 | int enabled; |
1617 | bool ret = true; | |
1618 | ||
1619 | spin_lock(&dist->lock); | |
1620 | ||
1621 | vcpu = kvm_get_vcpu(kvm, cpuid); | |
227844f5 CD |
1622 | edge_triggered = vgic_irq_is_edge(vcpu, irq_num); |
1623 | level_triggered = !edge_triggered; | |
5863c2ce MZ |
1624 | |
1625 | if (!vgic_validate_injection(vcpu, irq_num, level)) { | |
1626 | ret = false; | |
1627 | goto out; | |
1628 | } | |
1629 | ||
1630 | if (irq_num >= VGIC_NR_PRIVATE_IRQS) { | |
1631 | cpuid = dist->irq_spi_cpu[irq_num - VGIC_NR_PRIVATE_IRQS]; | |
1632 | vcpu = kvm_get_vcpu(kvm, cpuid); | |
1633 | } | |
1634 | ||
1635 | kvm_debug("Inject IRQ%d level %d CPU%d\n", irq_num, level, cpuid); | |
1636 | ||
faa1b46c CD |
1637 | if (level) { |
1638 | if (level_triggered) | |
1639 | vgic_dist_irq_set_level(vcpu, irq_num); | |
227844f5 | 1640 | vgic_dist_irq_set_pending(vcpu, irq_num); |
faa1b46c CD |
1641 | } else { |
1642 | if (level_triggered) { | |
1643 | vgic_dist_irq_clear_level(vcpu, irq_num); | |
1644 | if (!vgic_dist_irq_soft_pend(vcpu, irq_num)) | |
1645 | vgic_dist_irq_clear_pending(vcpu, irq_num); | |
1646 | } else { | |
1647 | vgic_dist_irq_clear_pending(vcpu, irq_num); | |
1648 | } | |
1649 | } | |
5863c2ce MZ |
1650 | |
1651 | enabled = vgic_irq_is_enabled(vcpu, irq_num); | |
1652 | ||
1653 | if (!enabled) { | |
1654 | ret = false; | |
1655 | goto out; | |
1656 | } | |
1657 | ||
dbf20f9d | 1658 | if (!vgic_can_sample_irq(vcpu, irq_num)) { |
5863c2ce MZ |
1659 | /* |
1660 | * Level interrupt in progress, will be picked up | |
1661 | * when EOId. | |
1662 | */ | |
1663 | ret = false; | |
1664 | goto out; | |
1665 | } | |
1666 | ||
1667 | if (level) { | |
1668 | vgic_cpu_irq_set(vcpu, irq_num); | |
c1bfb577 | 1669 | set_bit(cpuid, dist->irq_pending_on_cpu); |
5863c2ce MZ |
1670 | } |
1671 | ||
1672 | out: | |
1673 | spin_unlock(&dist->lock); | |
1674 | ||
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic | |
1680 | * @kvm: The VM structure pointer | |
1681 | * @cpuid: The CPU for PPIs | |
1682 | * @irq_num: The IRQ number that is assigned to the device | |
1683 | * @level: Edge-triggered: true: to trigger the interrupt | |
1684 | * false: to ignore the call | |
1685 | * Level-sensitive true: activates an interrupt | |
1686 | * false: deactivates an interrupt | |
1687 | * | |
1688 | * The GIC is not concerned with devices being active-LOW or active-HIGH for | |
1689 | * level-sensitive interrupts. You can think of the level parameter as 1 | |
1690 | * being HIGH and 0 being LOW and all devices being active-HIGH. | |
1691 | */ | |
1692 | int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num, | |
1693 | bool level) | |
1694 | { | |
71afaba4 MZ |
1695 | if (likely(vgic_initialized(kvm)) && |
1696 | vgic_update_irq_pending(kvm, cpuid, irq_num, level)) | |
5863c2ce MZ |
1697 | vgic_kick_vcpus(kvm); |
1698 | ||
1699 | return 0; | |
1700 | } | |
1701 | ||
01ac5e34 MZ |
1702 | static irqreturn_t vgic_maintenance_handler(int irq, void *data) |
1703 | { | |
1704 | /* | |
1705 | * We cannot rely on the vgic maintenance interrupt to be | |
1706 | * delivered synchronously. This means we can only use it to | |
1707 | * exit the VM, and we perform the handling of EOIed | |
1708 | * interrupts on the exit path (see vgic_process_maintenance). | |
1709 | */ | |
1710 | return IRQ_HANDLED; | |
1711 | } | |
1712 | ||
c1bfb577 MZ |
1713 | void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu) |
1714 | { | |
1715 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1716 | ||
1717 | kfree(vgic_cpu->pending_shared); | |
1718 | kfree(vgic_cpu->vgic_irq_lr_map); | |
1719 | vgic_cpu->pending_shared = NULL; | |
1720 | vgic_cpu->vgic_irq_lr_map = NULL; | |
1721 | } | |
1722 | ||
1723 | static int vgic_vcpu_init_maps(struct kvm_vcpu *vcpu, int nr_irqs) | |
1724 | { | |
1725 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1726 | ||
1727 | int sz = (nr_irqs - VGIC_NR_PRIVATE_IRQS) / 8; | |
1728 | vgic_cpu->pending_shared = kzalloc(sz, GFP_KERNEL); | |
1729 | vgic_cpu->vgic_irq_lr_map = kzalloc(nr_irqs, GFP_KERNEL); | |
1730 | ||
1731 | if (!vgic_cpu->pending_shared || !vgic_cpu->vgic_irq_lr_map) { | |
1732 | kvm_vgic_vcpu_destroy(vcpu); | |
1733 | return -ENOMEM; | |
1734 | } | |
1735 | ||
1736 | return 0; | |
1737 | } | |
1738 | ||
e1ba0207 CD |
1739 | /** |
1740 | * kvm_vgic_vcpu_init - Initialize per-vcpu VGIC state | |
1741 | * @vcpu: pointer to the vcpu struct | |
1742 | * | |
1743 | * Initialize the vgic_cpu struct and vgic_dist struct fields pertaining to | |
1744 | * this vcpu and enable the VGIC for this VCPU | |
1745 | */ | |
4956f2bc | 1746 | static void kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu) |
01ac5e34 MZ |
1747 | { |
1748 | struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; | |
1749 | struct vgic_dist *dist = &vcpu->kvm->arch.vgic; | |
1750 | int i; | |
1751 | ||
5fb66da6 | 1752 | for (i = 0; i < dist->nr_irqs; i++) { |
01ac5e34 MZ |
1753 | if (i < VGIC_NR_PPIS) |
1754 | vgic_bitmap_set_irq_val(&dist->irq_enabled, | |
1755 | vcpu->vcpu_id, i, 1); | |
1756 | if (i < VGIC_NR_PRIVATE_IRQS) | |
1757 | vgic_bitmap_set_irq_val(&dist->irq_cfg, | |
1758 | vcpu->vcpu_id, i, VGIC_CFG_EDGE); | |
1759 | ||
1760 | vgic_cpu->vgic_irq_lr_map[i] = LR_EMPTY; | |
1761 | } | |
1762 | ||
1763 | /* | |
ca85f623 MZ |
1764 | * Store the number of LRs per vcpu, so we don't have to go |
1765 | * all the way to the distributor structure to find out. Only | |
1766 | * assembly code should use this one. | |
01ac5e34 | 1767 | */ |
8f186d52 | 1768 | vgic_cpu->nr_lr = vgic->nr_lr; |
01ac5e34 | 1769 | |
da8dafd1 | 1770 | vgic_enable(vcpu); |
01ac5e34 MZ |
1771 | } |
1772 | ||
c1bfb577 MZ |
1773 | void kvm_vgic_destroy(struct kvm *kvm) |
1774 | { | |
1775 | struct vgic_dist *dist = &kvm->arch.vgic; | |
1776 | struct kvm_vcpu *vcpu; | |
1777 | int i; | |
1778 | ||
1779 | kvm_for_each_vcpu(i, vcpu, kvm) | |
1780 | kvm_vgic_vcpu_destroy(vcpu); | |
1781 | ||
1782 | vgic_free_bitmap(&dist->irq_enabled); | |
1783 | vgic_free_bitmap(&dist->irq_level); | |
1784 | vgic_free_bitmap(&dist->irq_pending); | |
1785 | vgic_free_bitmap(&dist->irq_soft_pend); | |
1786 | vgic_free_bitmap(&dist->irq_queued); | |
1787 | vgic_free_bitmap(&dist->irq_cfg); | |
1788 | vgic_free_bytemap(&dist->irq_priority); | |
1789 | if (dist->irq_spi_target) { | |
1790 | for (i = 0; i < dist->nr_cpus; i++) | |
1791 | vgic_free_bitmap(&dist->irq_spi_target[i]); | |
1792 | } | |
1793 | kfree(dist->irq_sgi_sources); | |
1794 | kfree(dist->irq_spi_cpu); | |
1795 | kfree(dist->irq_spi_target); | |
1796 | kfree(dist->irq_pending_on_cpu); | |
1797 | dist->irq_sgi_sources = NULL; | |
1798 | dist->irq_spi_cpu = NULL; | |
1799 | dist->irq_spi_target = NULL; | |
1800 | dist->irq_pending_on_cpu = NULL; | |
1801 | } | |
1802 | ||
1803 | /* | |
1804 | * Allocate and initialize the various data structures. Must be called | |
1805 | * with kvm->lock held! | |
1806 | */ | |
1807 | static int vgic_init_maps(struct kvm *kvm) | |
1808 | { | |
1809 | struct vgic_dist *dist = &kvm->arch.vgic; | |
1810 | struct kvm_vcpu *vcpu; | |
1811 | int nr_cpus, nr_irqs; | |
1812 | int ret, i; | |
1813 | ||
4956f2bc MZ |
1814 | if (dist->nr_cpus) /* Already allocated */ |
1815 | return 0; | |
1816 | ||
1817 | nr_cpus = dist->nr_cpus = atomic_read(&kvm->online_vcpus); | |
1818 | if (!nr_cpus) /* No vcpus? Can't be good... */ | |
1819 | return -EINVAL; | |
5fb66da6 | 1820 | |
4956f2bc MZ |
1821 | /* |
1822 | * If nobody configured the number of interrupts, use the | |
1823 | * legacy one. | |
1824 | */ | |
5fb66da6 MZ |
1825 | if (!dist->nr_irqs) |
1826 | dist->nr_irqs = VGIC_NR_IRQS_LEGACY; | |
1827 | ||
1828 | nr_irqs = dist->nr_irqs; | |
c1bfb577 MZ |
1829 | |
1830 | ret = vgic_init_bitmap(&dist->irq_enabled, nr_cpus, nr_irqs); | |
1831 | ret |= vgic_init_bitmap(&dist->irq_level, nr_cpus, nr_irqs); | |
1832 | ret |= vgic_init_bitmap(&dist->irq_pending, nr_cpus, nr_irqs); | |
1833 | ret |= vgic_init_bitmap(&dist->irq_soft_pend, nr_cpus, nr_irqs); | |
1834 | ret |= vgic_init_bitmap(&dist->irq_queued, nr_cpus, nr_irqs); | |
1835 | ret |= vgic_init_bitmap(&dist->irq_cfg, nr_cpus, nr_irqs); | |
1836 | ret |= vgic_init_bytemap(&dist->irq_priority, nr_cpus, nr_irqs); | |
1837 | ||
1838 | if (ret) | |
1839 | goto out; | |
1840 | ||
1841 | dist->irq_sgi_sources = kzalloc(nr_cpus * VGIC_NR_SGIS, GFP_KERNEL); | |
1842 | dist->irq_spi_cpu = kzalloc(nr_irqs - VGIC_NR_PRIVATE_IRQS, GFP_KERNEL); | |
1843 | dist->irq_spi_target = kzalloc(sizeof(*dist->irq_spi_target) * nr_cpus, | |
1844 | GFP_KERNEL); | |
1845 | dist->irq_pending_on_cpu = kzalloc(BITS_TO_LONGS(nr_cpus) * sizeof(long), | |
1846 | GFP_KERNEL); | |
1847 | if (!dist->irq_sgi_sources || | |
1848 | !dist->irq_spi_cpu || | |
1849 | !dist->irq_spi_target || | |
1850 | !dist->irq_pending_on_cpu) { | |
1851 | ret = -ENOMEM; | |
1852 | goto out; | |
1853 | } | |
1854 | ||
1855 | for (i = 0; i < nr_cpus; i++) | |
1856 | ret |= vgic_init_bitmap(&dist->irq_spi_target[i], | |
1857 | nr_cpus, nr_irqs); | |
1858 | ||
1859 | if (ret) | |
1860 | goto out; | |
1861 | ||
1862 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1863 | ret = vgic_vcpu_init_maps(vcpu, nr_irqs); | |
1864 | if (ret) { | |
1865 | kvm_err("VGIC: Failed to allocate vcpu memory\n"); | |
1866 | break; | |
1867 | } | |
1868 | } | |
1869 | ||
4956f2bc MZ |
1870 | for (i = VGIC_NR_PRIVATE_IRQS; i < dist->nr_irqs; i += 4) |
1871 | vgic_set_target_reg(kvm, 0, i); | |
1872 | ||
c1bfb577 MZ |
1873 | out: |
1874 | if (ret) | |
1875 | kvm_vgic_destroy(kvm); | |
1876 | ||
1877 | return ret; | |
1878 | } | |
1879 | ||
e1ba0207 CD |
1880 | /** |
1881 | * kvm_vgic_init - Initialize global VGIC state before running any VCPUs | |
1882 | * @kvm: pointer to the kvm struct | |
1883 | * | |
1884 | * Map the virtual CPU interface into the VM before running any VCPUs. We | |
1885 | * can't do this at creation time, because user space must first set the | |
1886 | * virtual CPU interface address in the guest physical address space. Also | |
1887 | * initialize the ITARGETSRn regs to 0 on the emulated distributor. | |
1888 | */ | |
01ac5e34 MZ |
1889 | int kvm_vgic_init(struct kvm *kvm) |
1890 | { | |
4956f2bc | 1891 | struct kvm_vcpu *vcpu; |
01ac5e34 MZ |
1892 | int ret = 0, i; |
1893 | ||
e1ba0207 CD |
1894 | if (!irqchip_in_kernel(kvm)) |
1895 | return 0; | |
1896 | ||
01ac5e34 MZ |
1897 | mutex_lock(&kvm->lock); |
1898 | ||
1899 | if (vgic_initialized(kvm)) | |
1900 | goto out; | |
1901 | ||
1902 | if (IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_dist_base) || | |
1903 | IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_cpu_base)) { | |
1904 | kvm_err("Need to set vgic cpu and dist addresses first\n"); | |
1905 | ret = -ENXIO; | |
1906 | goto out; | |
1907 | } | |
1908 | ||
4956f2bc MZ |
1909 | ret = vgic_init_maps(kvm); |
1910 | if (ret) { | |
1911 | kvm_err("Unable to allocate maps\n"); | |
1912 | goto out; | |
1913 | } | |
1914 | ||
01ac5e34 | 1915 | ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base, |
c40f2f8f AB |
1916 | vgic->vcpu_base, KVM_VGIC_V2_CPU_SIZE, |
1917 | true); | |
01ac5e34 MZ |
1918 | if (ret) { |
1919 | kvm_err("Unable to remap VGIC CPU to VCPU\n"); | |
1920 | goto out; | |
1921 | } | |
1922 | ||
4956f2bc MZ |
1923 | kvm_for_each_vcpu(i, vcpu, kvm) |
1924 | kvm_vgic_vcpu_init(vcpu); | |
01ac5e34 MZ |
1925 | |
1926 | kvm->arch.vgic.ready = true; | |
1927 | out: | |
4956f2bc MZ |
1928 | if (ret) |
1929 | kvm_vgic_destroy(kvm); | |
01ac5e34 MZ |
1930 | mutex_unlock(&kvm->lock); |
1931 | return ret; | |
1932 | } | |
1933 | ||
1934 | int kvm_vgic_create(struct kvm *kvm) | |
1935 | { | |
6b50f540 | 1936 | int i, vcpu_lock_idx = -1, ret; |
7330672b | 1937 | struct kvm_vcpu *vcpu; |
01ac5e34 MZ |
1938 | |
1939 | mutex_lock(&kvm->lock); | |
1940 | ||
7330672b | 1941 | if (kvm->arch.vgic.vctrl_base) { |
01ac5e34 MZ |
1942 | ret = -EEXIST; |
1943 | goto out; | |
1944 | } | |
1945 | ||
7330672b CD |
1946 | /* |
1947 | * Any time a vcpu is run, vcpu_load is called which tries to grab the | |
1948 | * vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure | |
1949 | * that no other VCPUs are run while we create the vgic. | |
1950 | */ | |
6b50f540 | 1951 | ret = -EBUSY; |
7330672b CD |
1952 | kvm_for_each_vcpu(i, vcpu, kvm) { |
1953 | if (!mutex_trylock(&vcpu->mutex)) | |
1954 | goto out_unlock; | |
1955 | vcpu_lock_idx = i; | |
1956 | } | |
1957 | ||
1958 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
6b50f540 | 1959 | if (vcpu->arch.has_run_once) |
7330672b | 1960 | goto out_unlock; |
7330672b | 1961 | } |
6b50f540 | 1962 | ret = 0; |
7330672b | 1963 | |
01ac5e34 | 1964 | spin_lock_init(&kvm->arch.vgic.lock); |
f982cf4e | 1965 | kvm->arch.vgic.in_kernel = true; |
8f186d52 | 1966 | kvm->arch.vgic.vctrl_base = vgic->vctrl_base; |
01ac5e34 MZ |
1967 | kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF; |
1968 | kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF; | |
1969 | ||
7330672b CD |
1970 | out_unlock: |
1971 | for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) { | |
1972 | vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx); | |
1973 | mutex_unlock(&vcpu->mutex); | |
1974 | } | |
1975 | ||
01ac5e34 MZ |
1976 | out: |
1977 | mutex_unlock(&kvm->lock); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1fa451bc | 1981 | static int vgic_ioaddr_overlap(struct kvm *kvm) |
330690cd CD |
1982 | { |
1983 | phys_addr_t dist = kvm->arch.vgic.vgic_dist_base; | |
1984 | phys_addr_t cpu = kvm->arch.vgic.vgic_cpu_base; | |
1985 | ||
1986 | if (IS_VGIC_ADDR_UNDEF(dist) || IS_VGIC_ADDR_UNDEF(cpu)) | |
1987 | return 0; | |
1988 | if ((dist <= cpu && dist + KVM_VGIC_V2_DIST_SIZE > cpu) || | |
1989 | (cpu <= dist && cpu + KVM_VGIC_V2_CPU_SIZE > dist)) | |
1990 | return -EBUSY; | |
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr, | |
1995 | phys_addr_t addr, phys_addr_t size) | |
1996 | { | |
1997 | int ret; | |
1998 | ||
ce01e4e8 CD |
1999 | if (addr & ~KVM_PHYS_MASK) |
2000 | return -E2BIG; | |
2001 | ||
2002 | if (addr & (SZ_4K - 1)) | |
2003 | return -EINVAL; | |
2004 | ||
330690cd CD |
2005 | if (!IS_VGIC_ADDR_UNDEF(*ioaddr)) |
2006 | return -EEXIST; | |
2007 | if (addr + size < addr) | |
2008 | return -EINVAL; | |
2009 | ||
30c21170 | 2010 | *ioaddr = addr; |
330690cd CD |
2011 | ret = vgic_ioaddr_overlap(kvm); |
2012 | if (ret) | |
30c21170 HW |
2013 | *ioaddr = VGIC_ADDR_UNDEF; |
2014 | ||
330690cd CD |
2015 | return ret; |
2016 | } | |
2017 | ||
ce01e4e8 CD |
2018 | /** |
2019 | * kvm_vgic_addr - set or get vgic VM base addresses | |
2020 | * @kvm: pointer to the vm struct | |
2021 | * @type: the VGIC addr type, one of KVM_VGIC_V2_ADDR_TYPE_XXX | |
2022 | * @addr: pointer to address value | |
2023 | * @write: if true set the address in the VM address space, if false read the | |
2024 | * address | |
2025 | * | |
2026 | * Set or get the vgic base addresses for the distributor and the virtual CPU | |
2027 | * interface in the VM physical address space. These addresses are properties | |
2028 | * of the emulated core/SoC and therefore user space initially knows this | |
2029 | * information. | |
2030 | */ | |
2031 | int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write) | |
330690cd CD |
2032 | { |
2033 | int r = 0; | |
2034 | struct vgic_dist *vgic = &kvm->arch.vgic; | |
2035 | ||
330690cd CD |
2036 | mutex_lock(&kvm->lock); |
2037 | switch (type) { | |
2038 | case KVM_VGIC_V2_ADDR_TYPE_DIST: | |
ce01e4e8 CD |
2039 | if (write) { |
2040 | r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base, | |
2041 | *addr, KVM_VGIC_V2_DIST_SIZE); | |
2042 | } else { | |
2043 | *addr = vgic->vgic_dist_base; | |
2044 | } | |
330690cd CD |
2045 | break; |
2046 | case KVM_VGIC_V2_ADDR_TYPE_CPU: | |
ce01e4e8 CD |
2047 | if (write) { |
2048 | r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base, | |
2049 | *addr, KVM_VGIC_V2_CPU_SIZE); | |
2050 | } else { | |
2051 | *addr = vgic->vgic_cpu_base; | |
2052 | } | |
330690cd CD |
2053 | break; |
2054 | default: | |
2055 | r = -ENODEV; | |
2056 | } | |
2057 | ||
2058 | mutex_unlock(&kvm->lock); | |
2059 | return r; | |
2060 | } | |
7330672b | 2061 | |
c07a0191 CD |
2062 | static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu, |
2063 | struct kvm_exit_mmio *mmio, phys_addr_t offset) | |
2064 | { | |
fa20f5ae | 2065 | bool updated = false; |
beee38b9 MZ |
2066 | struct vgic_vmcr vmcr; |
2067 | u32 *vmcr_field; | |
2068 | u32 reg; | |
2069 | ||
2070 | vgic_get_vmcr(vcpu, &vmcr); | |
fa20f5ae CD |
2071 | |
2072 | switch (offset & ~0x3) { | |
2073 | case GIC_CPU_CTRL: | |
beee38b9 | 2074 | vmcr_field = &vmcr.ctlr; |
fa20f5ae CD |
2075 | break; |
2076 | case GIC_CPU_PRIMASK: | |
beee38b9 | 2077 | vmcr_field = &vmcr.pmr; |
fa20f5ae CD |
2078 | break; |
2079 | case GIC_CPU_BINPOINT: | |
beee38b9 | 2080 | vmcr_field = &vmcr.bpr; |
fa20f5ae CD |
2081 | break; |
2082 | case GIC_CPU_ALIAS_BINPOINT: | |
beee38b9 | 2083 | vmcr_field = &vmcr.abpr; |
fa20f5ae | 2084 | break; |
beee38b9 MZ |
2085 | default: |
2086 | BUG(); | |
fa20f5ae CD |
2087 | } |
2088 | ||
2089 | if (!mmio->is_write) { | |
beee38b9 | 2090 | reg = *vmcr_field; |
fa20f5ae CD |
2091 | mmio_data_write(mmio, ~0, reg); |
2092 | } else { | |
2093 | reg = mmio_data_read(mmio, ~0); | |
beee38b9 MZ |
2094 | if (reg != *vmcr_field) { |
2095 | *vmcr_field = reg; | |
2096 | vgic_set_vmcr(vcpu, &vmcr); | |
fa20f5ae | 2097 | updated = true; |
beee38b9 | 2098 | } |
fa20f5ae CD |
2099 | } |
2100 | return updated; | |
2101 | } | |
2102 | ||
2103 | static bool handle_mmio_abpr(struct kvm_vcpu *vcpu, | |
2104 | struct kvm_exit_mmio *mmio, phys_addr_t offset) | |
2105 | { | |
2106 | return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT); | |
c07a0191 CD |
2107 | } |
2108 | ||
fa20f5ae CD |
2109 | static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu, |
2110 | struct kvm_exit_mmio *mmio, | |
2111 | phys_addr_t offset) | |
2112 | { | |
2113 | u32 reg; | |
2114 | ||
2115 | if (mmio->is_write) | |
2116 | return false; | |
2117 | ||
2118 | /* GICC_IIDR */ | |
2119 | reg = (PRODUCT_ID_KVM << 20) | | |
2120 | (GICC_ARCH_VERSION_V2 << 16) | | |
2121 | (IMPLEMENTER_ARM << 0); | |
2122 | mmio_data_write(mmio, ~0, reg); | |
2123 | return false; | |
2124 | } | |
2125 | ||
2126 | /* | |
2127 | * CPU Interface Register accesses - these are not accessed by the VM, but by | |
2128 | * user space for saving and restoring VGIC state. | |
2129 | */ | |
c07a0191 CD |
2130 | static const struct mmio_range vgic_cpu_ranges[] = { |
2131 | { | |
2132 | .base = GIC_CPU_CTRL, | |
2133 | .len = 12, | |
2134 | .handle_mmio = handle_cpu_mmio_misc, | |
2135 | }, | |
2136 | { | |
2137 | .base = GIC_CPU_ALIAS_BINPOINT, | |
2138 | .len = 4, | |
fa20f5ae | 2139 | .handle_mmio = handle_mmio_abpr, |
c07a0191 CD |
2140 | }, |
2141 | { | |
2142 | .base = GIC_CPU_ACTIVEPRIO, | |
2143 | .len = 16, | |
fa20f5ae | 2144 | .handle_mmio = handle_mmio_raz_wi, |
c07a0191 CD |
2145 | }, |
2146 | { | |
2147 | .base = GIC_CPU_IDENT, | |
2148 | .len = 4, | |
fa20f5ae | 2149 | .handle_mmio = handle_cpu_mmio_ident, |
c07a0191 CD |
2150 | }, |
2151 | }; | |
2152 | ||
2153 | static int vgic_attr_regs_access(struct kvm_device *dev, | |
2154 | struct kvm_device_attr *attr, | |
2155 | u32 *reg, bool is_write) | |
2156 | { | |
2157 | const struct mmio_range *r = NULL, *ranges; | |
2158 | phys_addr_t offset; | |
2159 | int ret, cpuid, c; | |
2160 | struct kvm_vcpu *vcpu, *tmp_vcpu; | |
2161 | struct vgic_dist *vgic; | |
2162 | struct kvm_exit_mmio mmio; | |
2163 | ||
2164 | offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK; | |
2165 | cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >> | |
2166 | KVM_DEV_ARM_VGIC_CPUID_SHIFT; | |
2167 | ||
2168 | mutex_lock(&dev->kvm->lock); | |
2169 | ||
4956f2bc MZ |
2170 | ret = vgic_init_maps(dev->kvm); |
2171 | if (ret) | |
2172 | goto out; | |
2173 | ||
c07a0191 CD |
2174 | if (cpuid >= atomic_read(&dev->kvm->online_vcpus)) { |
2175 | ret = -EINVAL; | |
2176 | goto out; | |
2177 | } | |
2178 | ||
2179 | vcpu = kvm_get_vcpu(dev->kvm, cpuid); | |
2180 | vgic = &dev->kvm->arch.vgic; | |
2181 | ||
2182 | mmio.len = 4; | |
2183 | mmio.is_write = is_write; | |
2184 | if (is_write) | |
2185 | mmio_data_write(&mmio, ~0, *reg); | |
2186 | switch (attr->group) { | |
2187 | case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: | |
2188 | mmio.phys_addr = vgic->vgic_dist_base + offset; | |
2189 | ranges = vgic_dist_ranges; | |
2190 | break; | |
2191 | case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: | |
2192 | mmio.phys_addr = vgic->vgic_cpu_base + offset; | |
2193 | ranges = vgic_cpu_ranges; | |
2194 | break; | |
2195 | default: | |
2196 | BUG(); | |
2197 | } | |
2198 | r = find_matching_range(ranges, &mmio, offset); | |
2199 | ||
2200 | if (unlikely(!r || !r->handle_mmio)) { | |
2201 | ret = -ENXIO; | |
2202 | goto out; | |
2203 | } | |
2204 | ||
2205 | ||
2206 | spin_lock(&vgic->lock); | |
2207 | ||
2208 | /* | |
2209 | * Ensure that no other VCPU is running by checking the vcpu->cpu | |
2210 | * field. If no other VPCUs are running we can safely access the VGIC | |
2211 | * state, because even if another VPU is run after this point, that | |
2212 | * VCPU will not touch the vgic state, because it will block on | |
2213 | * getting the vgic->lock in kvm_vgic_sync_hwstate(). | |
2214 | */ | |
2215 | kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) { | |
2216 | if (unlikely(tmp_vcpu->cpu != -1)) { | |
2217 | ret = -EBUSY; | |
2218 | goto out_vgic_unlock; | |
2219 | } | |
2220 | } | |
2221 | ||
cbd333a4 CD |
2222 | /* |
2223 | * Move all pending IRQs from the LRs on all VCPUs so the pending | |
2224 | * state can be properly represented in the register state accessible | |
2225 | * through this API. | |
2226 | */ | |
2227 | kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) | |
2228 | vgic_unqueue_irqs(tmp_vcpu); | |
2229 | ||
c07a0191 CD |
2230 | offset -= r->base; |
2231 | r->handle_mmio(vcpu, &mmio, offset); | |
2232 | ||
2233 | if (!is_write) | |
2234 | *reg = mmio_data_read(&mmio, ~0); | |
2235 | ||
2236 | ret = 0; | |
2237 | out_vgic_unlock: | |
2238 | spin_unlock(&vgic->lock); | |
2239 | out: | |
2240 | mutex_unlock(&dev->kvm->lock); | |
2241 | return ret; | |
2242 | } | |
2243 | ||
7330672b CD |
2244 | static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
2245 | { | |
ce01e4e8 CD |
2246 | int r; |
2247 | ||
2248 | switch (attr->group) { | |
2249 | case KVM_DEV_ARM_VGIC_GRP_ADDR: { | |
2250 | u64 __user *uaddr = (u64 __user *)(long)attr->addr; | |
2251 | u64 addr; | |
2252 | unsigned long type = (unsigned long)attr->attr; | |
2253 | ||
2254 | if (copy_from_user(&addr, uaddr, sizeof(addr))) | |
2255 | return -EFAULT; | |
2256 | ||
2257 | r = kvm_vgic_addr(dev->kvm, type, &addr, true); | |
2258 | return (r == -ENODEV) ? -ENXIO : r; | |
2259 | } | |
c07a0191 CD |
2260 | |
2261 | case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: | |
2262 | case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: { | |
2263 | u32 __user *uaddr = (u32 __user *)(long)attr->addr; | |
2264 | u32 reg; | |
2265 | ||
2266 | if (get_user(reg, uaddr)) | |
2267 | return -EFAULT; | |
2268 | ||
2269 | return vgic_attr_regs_access(dev, attr, ®, true); | |
2270 | } | |
a98f26f1 MZ |
2271 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: { |
2272 | u32 __user *uaddr = (u32 __user *)(long)attr->addr; | |
2273 | u32 val; | |
2274 | int ret = 0; | |
2275 | ||
2276 | if (get_user(val, uaddr)) | |
2277 | return -EFAULT; | |
2278 | ||
2279 | /* | |
2280 | * We require: | |
2281 | * - at least 32 SPIs on top of the 16 SGIs and 16 PPIs | |
2282 | * - at most 1024 interrupts | |
2283 | * - a multiple of 32 interrupts | |
2284 | */ | |
2285 | if (val < (VGIC_NR_PRIVATE_IRQS + 32) || | |
2286 | val > VGIC_MAX_IRQS || | |
2287 | (val & 31)) | |
2288 | return -EINVAL; | |
2289 | ||
2290 | mutex_lock(&dev->kvm->lock); | |
2291 | ||
2292 | if (vgic_initialized(dev->kvm) || dev->kvm->arch.vgic.nr_irqs) | |
2293 | ret = -EBUSY; | |
2294 | else | |
2295 | dev->kvm->arch.vgic.nr_irqs = val; | |
2296 | ||
2297 | mutex_unlock(&dev->kvm->lock); | |
2298 | ||
2299 | return ret; | |
2300 | } | |
c07a0191 | 2301 | |
ce01e4e8 CD |
2302 | } |
2303 | ||
7330672b CD |
2304 | return -ENXIO; |
2305 | } | |
2306 | ||
2307 | static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) | |
2308 | { | |
ce01e4e8 CD |
2309 | int r = -ENXIO; |
2310 | ||
2311 | switch (attr->group) { | |
2312 | case KVM_DEV_ARM_VGIC_GRP_ADDR: { | |
2313 | u64 __user *uaddr = (u64 __user *)(long)attr->addr; | |
2314 | u64 addr; | |
2315 | unsigned long type = (unsigned long)attr->attr; | |
2316 | ||
2317 | r = kvm_vgic_addr(dev->kvm, type, &addr, false); | |
2318 | if (r) | |
2319 | return (r == -ENODEV) ? -ENXIO : r; | |
2320 | ||
2321 | if (copy_to_user(uaddr, &addr, sizeof(addr))) | |
2322 | return -EFAULT; | |
c07a0191 CD |
2323 | break; |
2324 | } | |
2325 | ||
2326 | case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: | |
2327 | case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: { | |
2328 | u32 __user *uaddr = (u32 __user *)(long)attr->addr; | |
2329 | u32 reg = 0; | |
2330 | ||
2331 | r = vgic_attr_regs_access(dev, attr, ®, false); | |
2332 | if (r) | |
2333 | return r; | |
2334 | r = put_user(reg, uaddr); | |
2335 | break; | |
ce01e4e8 | 2336 | } |
a98f26f1 MZ |
2337 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: { |
2338 | u32 __user *uaddr = (u32 __user *)(long)attr->addr; | |
2339 | r = put_user(dev->kvm->arch.vgic.nr_irqs, uaddr); | |
2340 | break; | |
2341 | } | |
c07a0191 | 2342 | |
ce01e4e8 CD |
2343 | } |
2344 | ||
2345 | return r; | |
7330672b CD |
2346 | } |
2347 | ||
c07a0191 CD |
2348 | static int vgic_has_attr_regs(const struct mmio_range *ranges, |
2349 | phys_addr_t offset) | |
2350 | { | |
2351 | struct kvm_exit_mmio dev_attr_mmio; | |
2352 | ||
2353 | dev_attr_mmio.len = 4; | |
2354 | if (find_matching_range(ranges, &dev_attr_mmio, offset)) | |
2355 | return 0; | |
2356 | else | |
2357 | return -ENXIO; | |
2358 | } | |
2359 | ||
7330672b CD |
2360 | static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
2361 | { | |
c07a0191 CD |
2362 | phys_addr_t offset; |
2363 | ||
ce01e4e8 CD |
2364 | switch (attr->group) { |
2365 | case KVM_DEV_ARM_VGIC_GRP_ADDR: | |
2366 | switch (attr->attr) { | |
2367 | case KVM_VGIC_V2_ADDR_TYPE_DIST: | |
2368 | case KVM_VGIC_V2_ADDR_TYPE_CPU: | |
2369 | return 0; | |
2370 | } | |
2371 | break; | |
c07a0191 CD |
2372 | case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: |
2373 | offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK; | |
2374 | return vgic_has_attr_regs(vgic_dist_ranges, offset); | |
2375 | case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: | |
2376 | offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK; | |
2377 | return vgic_has_attr_regs(vgic_cpu_ranges, offset); | |
a98f26f1 MZ |
2378 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: |
2379 | return 0; | |
ce01e4e8 | 2380 | } |
7330672b CD |
2381 | return -ENXIO; |
2382 | } | |
2383 | ||
2384 | static void vgic_destroy(struct kvm_device *dev) | |
2385 | { | |
2386 | kfree(dev); | |
2387 | } | |
2388 | ||
2389 | static int vgic_create(struct kvm_device *dev, u32 type) | |
2390 | { | |
2391 | return kvm_vgic_create(dev->kvm); | |
2392 | } | |
2393 | ||
c06a841b | 2394 | static struct kvm_device_ops kvm_arm_vgic_v2_ops = { |
7330672b CD |
2395 | .name = "kvm-arm-vgic", |
2396 | .create = vgic_create, | |
2397 | .destroy = vgic_destroy, | |
2398 | .set_attr = vgic_set_attr, | |
2399 | .get_attr = vgic_get_attr, | |
2400 | .has_attr = vgic_has_attr, | |
2401 | }; | |
c06a841b WD |
2402 | |
2403 | static void vgic_init_maintenance_interrupt(void *info) | |
2404 | { | |
2405 | enable_percpu_irq(vgic->maint_irq, 0); | |
2406 | } | |
2407 | ||
2408 | static int vgic_cpu_notify(struct notifier_block *self, | |
2409 | unsigned long action, void *cpu) | |
2410 | { | |
2411 | switch (action) { | |
2412 | case CPU_STARTING: | |
2413 | case CPU_STARTING_FROZEN: | |
2414 | vgic_init_maintenance_interrupt(NULL); | |
2415 | break; | |
2416 | case CPU_DYING: | |
2417 | case CPU_DYING_FROZEN: | |
2418 | disable_percpu_irq(vgic->maint_irq); | |
2419 | break; | |
2420 | } | |
2421 | ||
2422 | return NOTIFY_OK; | |
2423 | } | |
2424 | ||
2425 | static struct notifier_block vgic_cpu_nb = { | |
2426 | .notifier_call = vgic_cpu_notify, | |
2427 | }; | |
2428 | ||
2429 | static const struct of_device_id vgic_ids[] = { | |
2430 | { .compatible = "arm,cortex-a15-gic", .data = vgic_v2_probe, }, | |
2431 | { .compatible = "arm,gic-v3", .data = vgic_v3_probe, }, | |
2432 | {}, | |
2433 | }; | |
2434 | ||
2435 | int kvm_vgic_hyp_init(void) | |
2436 | { | |
2437 | const struct of_device_id *matched_id; | |
a875dafc CD |
2438 | const int (*vgic_probe)(struct device_node *,const struct vgic_ops **, |
2439 | const struct vgic_params **); | |
c06a841b WD |
2440 | struct device_node *vgic_node; |
2441 | int ret; | |
2442 | ||
2443 | vgic_node = of_find_matching_node_and_match(NULL, | |
2444 | vgic_ids, &matched_id); | |
2445 | if (!vgic_node) { | |
2446 | kvm_err("error: no compatible GIC node found\n"); | |
2447 | return -ENODEV; | |
2448 | } | |
2449 | ||
2450 | vgic_probe = matched_id->data; | |
2451 | ret = vgic_probe(vgic_node, &vgic_ops, &vgic); | |
2452 | if (ret) | |
2453 | return ret; | |
2454 | ||
2455 | ret = request_percpu_irq(vgic->maint_irq, vgic_maintenance_handler, | |
2456 | "vgic", kvm_get_running_vcpus()); | |
2457 | if (ret) { | |
2458 | kvm_err("Cannot register interrupt %d\n", vgic->maint_irq); | |
2459 | return ret; | |
2460 | } | |
2461 | ||
2462 | ret = __register_cpu_notifier(&vgic_cpu_nb); | |
2463 | if (ret) { | |
2464 | kvm_err("Cannot register vgic CPU notifier\n"); | |
2465 | goto out_free_irq; | |
2466 | } | |
2467 | ||
2468 | /* Callback into for arch code for setup */ | |
2469 | vgic_arch_setup(vgic); | |
2470 | ||
2471 | on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1); | |
2472 | ||
2473 | return kvm_register_device_ops(&kvm_arm_vgic_v2_ops, | |
2474 | KVM_DEV_TYPE_ARM_VGIC_V2); | |
2475 | ||
2476 | out_free_irq: | |
2477 | free_percpu_irq(vgic->maint_irq, kvm_get_running_vcpus()); | |
2478 | return ret; | |
2479 | } |