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7c8c5e6a MZ |
1 | /* |
2 | * Copyright (C) 2012,2013 - ARM Ltd | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * Derived from arch/arm/kvm/coproc.c: | |
6 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
7 | * Authors: Rusty Russell <rusty@rustcorp.com.au> | |
8 | * Christoffer Dall <c.dall@virtualopensystems.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License, version 2, as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
21 | */ | |
22 | ||
7c8c5e6a | 23 | #include <linux/kvm_host.h> |
c6d01a94 | 24 | #include <linux/mm.h> |
7c8c5e6a | 25 | #include <linux/uaccess.h> |
c6d01a94 | 26 | |
7c8c5e6a MZ |
27 | #include <asm/cacheflush.h> |
28 | #include <asm/cputype.h> | |
0c557ed4 | 29 | #include <asm/debug-monitors.h> |
c6d01a94 MR |
30 | #include <asm/esr.h> |
31 | #include <asm/kvm_arm.h> | |
9d8415d6 | 32 | #include <asm/kvm_asm.h> |
c6d01a94 MR |
33 | #include <asm/kvm_coproc.h> |
34 | #include <asm/kvm_emulate.h> | |
35 | #include <asm/kvm_host.h> | |
36 | #include <asm/kvm_mmu.h> | |
ab946834 | 37 | #include <asm/perf_event.h> |
c6d01a94 | 38 | |
7c8c5e6a MZ |
39 | #include <trace/events/kvm.h> |
40 | ||
41 | #include "sys_regs.h" | |
42 | ||
eef8c85a AB |
43 | #include "trace.h" |
44 | ||
7c8c5e6a MZ |
45 | /* |
46 | * All of this file is extremly similar to the ARM coproc.c, but the | |
47 | * types are different. My gut feeling is that it should be pretty | |
48 | * easy to merge, but that would be an ABI breakage -- again. VFP | |
49 | * would also need to be abstracted. | |
62a89c44 MZ |
50 | * |
51 | * For AArch32, we only take care of what is being trapped. Anything | |
52 | * that has to do with init and userspace access has to go via the | |
53 | * 64bit interface. | |
7c8c5e6a MZ |
54 | */ |
55 | ||
56 | /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */ | |
57 | static u32 cache_levels; | |
58 | ||
59 | /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ | |
60 | #define CSSELR_MAX 12 | |
61 | ||
62 | /* Which cache CCSIDR represents depends on CSSELR value. */ | |
63 | static u32 get_ccsidr(u32 csselr) | |
64 | { | |
65 | u32 ccsidr; | |
66 | ||
67 | /* Make sure noone else changes CSSELR during this! */ | |
68 | local_irq_disable(); | |
69 | /* Put value into CSSELR */ | |
70 | asm volatile("msr csselr_el1, %x0" : : "r" (csselr)); | |
71 | isb(); | |
72 | /* Read result out of CCSIDR */ | |
73 | asm volatile("mrs %0, ccsidr_el1" : "=r" (ccsidr)); | |
74 | local_irq_enable(); | |
75 | ||
76 | return ccsidr; | |
77 | } | |
78 | ||
3c1e7165 MZ |
79 | /* |
80 | * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). | |
81 | */ | |
7c8c5e6a | 82 | static bool access_dcsw(struct kvm_vcpu *vcpu, |
3fec037d | 83 | struct sys_reg_params *p, |
7c8c5e6a MZ |
84 | const struct sys_reg_desc *r) |
85 | { | |
7c8c5e6a MZ |
86 | if (!p->is_write) |
87 | return read_from_write_only(vcpu, p); | |
88 | ||
3c1e7165 | 89 | kvm_set_way_flush(vcpu); |
7c8c5e6a MZ |
90 | return true; |
91 | } | |
92 | ||
4d44923b MZ |
93 | /* |
94 | * Generic accessor for VM registers. Only called as long as HCR_TVM | |
3c1e7165 MZ |
95 | * is set. If the guest enables the MMU, we stop trapping the VM |
96 | * sys_regs and leave it in complete control of the caches. | |
4d44923b MZ |
97 | */ |
98 | static bool access_vm_reg(struct kvm_vcpu *vcpu, | |
3fec037d | 99 | struct sys_reg_params *p, |
4d44923b MZ |
100 | const struct sys_reg_desc *r) |
101 | { | |
3c1e7165 | 102 | bool was_enabled = vcpu_has_cache_enabled(vcpu); |
4d44923b MZ |
103 | |
104 | BUG_ON(!p->is_write); | |
105 | ||
dedf97e8 | 106 | if (!p->is_aarch32) { |
2ec5be3d | 107 | vcpu_sys_reg(vcpu, r->reg) = p->regval; |
dedf97e8 MZ |
108 | } else { |
109 | if (!p->is_32bit) | |
2ec5be3d PF |
110 | vcpu_cp15_64_high(vcpu, r->reg) = upper_32_bits(p->regval); |
111 | vcpu_cp15_64_low(vcpu, r->reg) = lower_32_bits(p->regval); | |
dedf97e8 | 112 | } |
f0a3eaff | 113 | |
3c1e7165 | 114 | kvm_toggle_cache(vcpu, was_enabled); |
4d44923b MZ |
115 | return true; |
116 | } | |
117 | ||
6d52f35a AP |
118 | /* |
119 | * Trap handler for the GICv3 SGI generation system register. | |
120 | * Forward the request to the VGIC emulation. | |
121 | * The cp15_64 code makes sure this automatically works | |
122 | * for both AArch64 and AArch32 accesses. | |
123 | */ | |
124 | static bool access_gic_sgi(struct kvm_vcpu *vcpu, | |
3fec037d | 125 | struct sys_reg_params *p, |
6d52f35a AP |
126 | const struct sys_reg_desc *r) |
127 | { | |
6d52f35a AP |
128 | if (!p->is_write) |
129 | return read_from_write_only(vcpu, p); | |
130 | ||
2ec5be3d | 131 | vgic_v3_dispatch_sgi(vcpu, p->regval); |
6d52f35a AP |
132 | |
133 | return true; | |
134 | } | |
135 | ||
7609c125 | 136 | static bool trap_raz_wi(struct kvm_vcpu *vcpu, |
3fec037d | 137 | struct sys_reg_params *p, |
7609c125 | 138 | const struct sys_reg_desc *r) |
7c8c5e6a MZ |
139 | { |
140 | if (p->is_write) | |
141 | return ignore_write(vcpu, p); | |
142 | else | |
143 | return read_zero(vcpu, p); | |
144 | } | |
145 | ||
0c557ed4 | 146 | static bool trap_oslsr_el1(struct kvm_vcpu *vcpu, |
3fec037d | 147 | struct sys_reg_params *p, |
0c557ed4 MZ |
148 | const struct sys_reg_desc *r) |
149 | { | |
150 | if (p->is_write) { | |
151 | return ignore_write(vcpu, p); | |
152 | } else { | |
2ec5be3d | 153 | p->regval = (1 << 3); |
0c557ed4 MZ |
154 | return true; |
155 | } | |
156 | } | |
157 | ||
158 | static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu, | |
3fec037d | 159 | struct sys_reg_params *p, |
0c557ed4 MZ |
160 | const struct sys_reg_desc *r) |
161 | { | |
162 | if (p->is_write) { | |
163 | return ignore_write(vcpu, p); | |
164 | } else { | |
165 | u32 val; | |
166 | asm volatile("mrs %0, dbgauthstatus_el1" : "=r" (val)); | |
2ec5be3d | 167 | p->regval = val; |
0c557ed4 MZ |
168 | return true; |
169 | } | |
170 | } | |
171 | ||
172 | /* | |
173 | * We want to avoid world-switching all the DBG registers all the | |
174 | * time: | |
175 | * | |
176 | * - If we've touched any debug register, it is likely that we're | |
177 | * going to touch more of them. It then makes sense to disable the | |
178 | * traps and start doing the save/restore dance | |
179 | * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is | |
180 | * then mandatory to save/restore the registers, as the guest | |
181 | * depends on them. | |
182 | * | |
183 | * For this, we use a DIRTY bit, indicating the guest has modified the | |
184 | * debug registers, used as follow: | |
185 | * | |
186 | * On guest entry: | |
187 | * - If the dirty bit is set (because we're coming back from trapping), | |
188 | * disable the traps, save host registers, restore guest registers. | |
189 | * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), | |
190 | * set the dirty bit, disable the traps, save host registers, | |
191 | * restore guest registers. | |
192 | * - Otherwise, enable the traps | |
193 | * | |
194 | * On guest exit: | |
195 | * - If the dirty bit is set, save guest registers, restore host | |
196 | * registers and clear the dirty bit. This ensure that the host can | |
197 | * now use the debug registers. | |
198 | */ | |
199 | static bool trap_debug_regs(struct kvm_vcpu *vcpu, | |
3fec037d | 200 | struct sys_reg_params *p, |
0c557ed4 MZ |
201 | const struct sys_reg_desc *r) |
202 | { | |
203 | if (p->is_write) { | |
2ec5be3d | 204 | vcpu_sys_reg(vcpu, r->reg) = p->regval; |
0c557ed4 MZ |
205 | vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; |
206 | } else { | |
2ec5be3d | 207 | p->regval = vcpu_sys_reg(vcpu, r->reg); |
0c557ed4 MZ |
208 | } |
209 | ||
2ec5be3d | 210 | trace_trap_reg(__func__, r->reg, p->is_write, p->regval); |
eef8c85a | 211 | |
0c557ed4 MZ |
212 | return true; |
213 | } | |
214 | ||
84e690bf AB |
215 | /* |
216 | * reg_to_dbg/dbg_to_reg | |
217 | * | |
218 | * A 32 bit write to a debug register leave top bits alone | |
219 | * A 32 bit read from a debug register only returns the bottom bits | |
220 | * | |
221 | * All writes will set the KVM_ARM64_DEBUG_DIRTY flag to ensure the | |
222 | * hyp.S code switches between host and guest values in future. | |
223 | */ | |
281243cb MZ |
224 | static void reg_to_dbg(struct kvm_vcpu *vcpu, |
225 | struct sys_reg_params *p, | |
226 | u64 *dbg_reg) | |
84e690bf | 227 | { |
2ec5be3d | 228 | u64 val = p->regval; |
84e690bf AB |
229 | |
230 | if (p->is_32bit) { | |
231 | val &= 0xffffffffUL; | |
232 | val |= ((*dbg_reg >> 32) << 32); | |
233 | } | |
234 | ||
235 | *dbg_reg = val; | |
236 | vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; | |
237 | } | |
238 | ||
281243cb MZ |
239 | static void dbg_to_reg(struct kvm_vcpu *vcpu, |
240 | struct sys_reg_params *p, | |
241 | u64 *dbg_reg) | |
84e690bf | 242 | { |
2ec5be3d | 243 | p->regval = *dbg_reg; |
84e690bf | 244 | if (p->is_32bit) |
2ec5be3d | 245 | p->regval &= 0xffffffffUL; |
84e690bf AB |
246 | } |
247 | ||
281243cb MZ |
248 | static bool trap_bvr(struct kvm_vcpu *vcpu, |
249 | struct sys_reg_params *p, | |
250 | const struct sys_reg_desc *rd) | |
84e690bf AB |
251 | { |
252 | u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; | |
253 | ||
254 | if (p->is_write) | |
255 | reg_to_dbg(vcpu, p, dbg_reg); | |
256 | else | |
257 | dbg_to_reg(vcpu, p, dbg_reg); | |
258 | ||
eef8c85a AB |
259 | trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); |
260 | ||
84e690bf AB |
261 | return true; |
262 | } | |
263 | ||
264 | static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
265 | const struct kvm_one_reg *reg, void __user *uaddr) | |
266 | { | |
267 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; | |
268 | ||
1713e5aa | 269 | if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) |
84e690bf AB |
270 | return -EFAULT; |
271 | return 0; | |
272 | } | |
273 | ||
274 | static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
275 | const struct kvm_one_reg *reg, void __user *uaddr) | |
276 | { | |
277 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; | |
278 | ||
279 | if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) | |
280 | return -EFAULT; | |
281 | return 0; | |
282 | } | |
283 | ||
281243cb MZ |
284 | static void reset_bvr(struct kvm_vcpu *vcpu, |
285 | const struct sys_reg_desc *rd) | |
84e690bf AB |
286 | { |
287 | vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg] = rd->val; | |
288 | } | |
289 | ||
281243cb MZ |
290 | static bool trap_bcr(struct kvm_vcpu *vcpu, |
291 | struct sys_reg_params *p, | |
292 | const struct sys_reg_desc *rd) | |
84e690bf AB |
293 | { |
294 | u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; | |
295 | ||
296 | if (p->is_write) | |
297 | reg_to_dbg(vcpu, p, dbg_reg); | |
298 | else | |
299 | dbg_to_reg(vcpu, p, dbg_reg); | |
300 | ||
eef8c85a AB |
301 | trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); |
302 | ||
84e690bf AB |
303 | return true; |
304 | } | |
305 | ||
306 | static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
307 | const struct kvm_one_reg *reg, void __user *uaddr) | |
308 | { | |
309 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; | |
310 | ||
1713e5aa | 311 | if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) |
84e690bf AB |
312 | return -EFAULT; |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
318 | const struct kvm_one_reg *reg, void __user *uaddr) | |
319 | { | |
320 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; | |
321 | ||
322 | if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) | |
323 | return -EFAULT; | |
324 | return 0; | |
325 | } | |
326 | ||
281243cb MZ |
327 | static void reset_bcr(struct kvm_vcpu *vcpu, |
328 | const struct sys_reg_desc *rd) | |
84e690bf AB |
329 | { |
330 | vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg] = rd->val; | |
331 | } | |
332 | ||
281243cb MZ |
333 | static bool trap_wvr(struct kvm_vcpu *vcpu, |
334 | struct sys_reg_params *p, | |
335 | const struct sys_reg_desc *rd) | |
84e690bf AB |
336 | { |
337 | u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; | |
338 | ||
339 | if (p->is_write) | |
340 | reg_to_dbg(vcpu, p, dbg_reg); | |
341 | else | |
342 | dbg_to_reg(vcpu, p, dbg_reg); | |
343 | ||
eef8c85a AB |
344 | trace_trap_reg(__func__, rd->reg, p->is_write, |
345 | vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]); | |
346 | ||
84e690bf AB |
347 | return true; |
348 | } | |
349 | ||
350 | static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
351 | const struct kvm_one_reg *reg, void __user *uaddr) | |
352 | { | |
353 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; | |
354 | ||
1713e5aa | 355 | if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) |
84e690bf AB |
356 | return -EFAULT; |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
361 | const struct kvm_one_reg *reg, void __user *uaddr) | |
362 | { | |
363 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; | |
364 | ||
365 | if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) | |
366 | return -EFAULT; | |
367 | return 0; | |
368 | } | |
369 | ||
281243cb MZ |
370 | static void reset_wvr(struct kvm_vcpu *vcpu, |
371 | const struct sys_reg_desc *rd) | |
84e690bf AB |
372 | { |
373 | vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg] = rd->val; | |
374 | } | |
375 | ||
281243cb MZ |
376 | static bool trap_wcr(struct kvm_vcpu *vcpu, |
377 | struct sys_reg_params *p, | |
378 | const struct sys_reg_desc *rd) | |
84e690bf AB |
379 | { |
380 | u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; | |
381 | ||
382 | if (p->is_write) | |
383 | reg_to_dbg(vcpu, p, dbg_reg); | |
384 | else | |
385 | dbg_to_reg(vcpu, p, dbg_reg); | |
386 | ||
eef8c85a AB |
387 | trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); |
388 | ||
84e690bf AB |
389 | return true; |
390 | } | |
391 | ||
392 | static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
393 | const struct kvm_one_reg *reg, void __user *uaddr) | |
394 | { | |
395 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; | |
396 | ||
1713e5aa | 397 | if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) |
84e690bf AB |
398 | return -EFAULT; |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, | |
403 | const struct kvm_one_reg *reg, void __user *uaddr) | |
404 | { | |
405 | __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; | |
406 | ||
407 | if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) | |
408 | return -EFAULT; | |
409 | return 0; | |
410 | } | |
411 | ||
281243cb MZ |
412 | static void reset_wcr(struct kvm_vcpu *vcpu, |
413 | const struct sys_reg_desc *rd) | |
84e690bf AB |
414 | { |
415 | vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg] = rd->val; | |
416 | } | |
417 | ||
7c8c5e6a MZ |
418 | static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) |
419 | { | |
420 | u64 amair; | |
421 | ||
422 | asm volatile("mrs %0, amair_el1\n" : "=r" (amair)); | |
423 | vcpu_sys_reg(vcpu, AMAIR_EL1) = amair; | |
424 | } | |
425 | ||
426 | static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) | |
427 | { | |
4429fc64 AP |
428 | u64 mpidr; |
429 | ||
7c8c5e6a | 430 | /* |
4429fc64 AP |
431 | * Map the vcpu_id into the first three affinity level fields of |
432 | * the MPIDR. We limit the number of VCPUs in level 0 due to a | |
433 | * limitation to 16 CPUs in that level in the ICC_SGIxR registers | |
434 | * of the GICv3 to be able to address each CPU directly when | |
435 | * sending IPIs. | |
7c8c5e6a | 436 | */ |
4429fc64 AP |
437 | mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); |
438 | mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); | |
439 | mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); | |
440 | vcpu_sys_reg(vcpu, MPIDR_EL1) = (1ULL << 31) | mpidr; | |
7c8c5e6a MZ |
441 | } |
442 | ||
ab946834 SZ |
443 | static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) |
444 | { | |
445 | u64 pmcr, val; | |
446 | ||
447 | asm volatile("mrs %0, pmcr_el0\n" : "=r" (pmcr)); | |
448 | /* Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) is reset to UNKNOWN | |
449 | * except PMCR.E resetting to zero. | |
450 | */ | |
451 | val = ((pmcr & ~ARMV8_PMU_PMCR_MASK) | |
452 | | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E); | |
453 | vcpu_sys_reg(vcpu, PMCR_EL0) = val; | |
454 | } | |
455 | ||
456 | static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, | |
457 | const struct sys_reg_desc *r) | |
458 | { | |
459 | u64 val; | |
460 | ||
461 | if (!kvm_arm_pmu_v3_ready(vcpu)) | |
462 | return trap_raz_wi(vcpu, p, r); | |
463 | ||
464 | if (p->is_write) { | |
465 | /* Only update writeable bits of PMCR */ | |
466 | val = vcpu_sys_reg(vcpu, PMCR_EL0); | |
467 | val &= ~ARMV8_PMU_PMCR_MASK; | |
468 | val |= p->regval & ARMV8_PMU_PMCR_MASK; | |
469 | vcpu_sys_reg(vcpu, PMCR_EL0) = val; | |
470 | } else { | |
471 | /* PMCR.P & PMCR.C are RAZ */ | |
472 | val = vcpu_sys_reg(vcpu, PMCR_EL0) | |
473 | & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C); | |
474 | p->regval = val; | |
475 | } | |
476 | ||
477 | return true; | |
478 | } | |
479 | ||
3965c3ce SZ |
480 | static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, |
481 | const struct sys_reg_desc *r) | |
482 | { | |
483 | if (!kvm_arm_pmu_v3_ready(vcpu)) | |
484 | return trap_raz_wi(vcpu, p, r); | |
485 | ||
486 | if (p->is_write) | |
487 | vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval; | |
488 | else | |
489 | /* return PMSELR.SEL field */ | |
490 | p->regval = vcpu_sys_reg(vcpu, PMSELR_EL0) | |
491 | & ARMV8_PMU_COUNTER_MASK; | |
492 | ||
493 | return true; | |
494 | } | |
495 | ||
0c557ed4 MZ |
496 | /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ |
497 | #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ | |
498 | /* DBGBVRn_EL1 */ \ | |
499 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b100), \ | |
84e690bf | 500 | trap_bvr, reset_bvr, n, 0, get_bvr, set_bvr }, \ |
0c557ed4 MZ |
501 | /* DBGBCRn_EL1 */ \ |
502 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b101), \ | |
84e690bf | 503 | trap_bcr, reset_bcr, n, 0, get_bcr, set_bcr }, \ |
0c557ed4 MZ |
504 | /* DBGWVRn_EL1 */ \ |
505 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b110), \ | |
84e690bf | 506 | trap_wvr, reset_wvr, n, 0, get_wvr, set_wvr }, \ |
0c557ed4 MZ |
507 | /* DBGWCRn_EL1 */ \ |
508 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b111), \ | |
84e690bf | 509 | trap_wcr, reset_wcr, n, 0, get_wcr, set_wcr } |
0c557ed4 | 510 | |
7c8c5e6a MZ |
511 | /* |
512 | * Architected system registers. | |
513 | * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 | |
7609c125 MZ |
514 | * |
515 | * We could trap ID_DFR0 and tell the guest we don't support performance | |
516 | * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was | |
517 | * NAKed, so it will read the PMCR anyway. | |
518 | * | |
519 | * Therefore we tell the guest we have 0 counters. Unfortunately, we | |
520 | * must always support PMCCNTR (the cycle counter): we just RAZ/WI for | |
521 | * all PM registers, which doesn't crash the guest kernel at least. | |
522 | * | |
0c557ed4 MZ |
523 | * Debug handling: We do trap most, if not all debug related system |
524 | * registers. The implementation is good enough to ensure that a guest | |
525 | * can use these with minimal performance degradation. The drawback is | |
526 | * that we don't implement any of the external debug, none of the | |
527 | * OSlock protocol. This should be revisited if we ever encounter a | |
528 | * more demanding guest... | |
7c8c5e6a MZ |
529 | */ |
530 | static const struct sys_reg_desc sys_reg_descs[] = { | |
531 | /* DC ISW */ | |
532 | { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b0110), Op2(0b010), | |
533 | access_dcsw }, | |
534 | /* DC CSW */ | |
535 | { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1010), Op2(0b010), | |
536 | access_dcsw }, | |
537 | /* DC CISW */ | |
538 | { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b010), | |
539 | access_dcsw }, | |
540 | ||
0c557ed4 MZ |
541 | DBG_BCR_BVR_WCR_WVR_EL1(0), |
542 | DBG_BCR_BVR_WCR_WVR_EL1(1), | |
543 | /* MDCCINT_EL1 */ | |
544 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), | |
545 | trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, | |
546 | /* MDSCR_EL1 */ | |
547 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), | |
548 | trap_debug_regs, reset_val, MDSCR_EL1, 0 }, | |
549 | DBG_BCR_BVR_WCR_WVR_EL1(2), | |
550 | DBG_BCR_BVR_WCR_WVR_EL1(3), | |
551 | DBG_BCR_BVR_WCR_WVR_EL1(4), | |
552 | DBG_BCR_BVR_WCR_WVR_EL1(5), | |
553 | DBG_BCR_BVR_WCR_WVR_EL1(6), | |
554 | DBG_BCR_BVR_WCR_WVR_EL1(7), | |
555 | DBG_BCR_BVR_WCR_WVR_EL1(8), | |
556 | DBG_BCR_BVR_WCR_WVR_EL1(9), | |
557 | DBG_BCR_BVR_WCR_WVR_EL1(10), | |
558 | DBG_BCR_BVR_WCR_WVR_EL1(11), | |
559 | DBG_BCR_BVR_WCR_WVR_EL1(12), | |
560 | DBG_BCR_BVR_WCR_WVR_EL1(13), | |
561 | DBG_BCR_BVR_WCR_WVR_EL1(14), | |
562 | DBG_BCR_BVR_WCR_WVR_EL1(15), | |
563 | ||
564 | /* MDRAR_EL1 */ | |
565 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), | |
566 | trap_raz_wi }, | |
567 | /* OSLAR_EL1 */ | |
568 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b100), | |
569 | trap_raz_wi }, | |
570 | /* OSLSR_EL1 */ | |
571 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0001), Op2(0b100), | |
572 | trap_oslsr_el1 }, | |
573 | /* OSDLR_EL1 */ | |
574 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0011), Op2(0b100), | |
575 | trap_raz_wi }, | |
576 | /* DBGPRCR_EL1 */ | |
577 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0100), Op2(0b100), | |
578 | trap_raz_wi }, | |
579 | /* DBGCLAIMSET_EL1 */ | |
580 | { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1000), Op2(0b110), | |
581 | trap_raz_wi }, | |
582 | /* DBGCLAIMCLR_EL1 */ | |
583 | { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1001), Op2(0b110), | |
584 | trap_raz_wi }, | |
585 | /* DBGAUTHSTATUS_EL1 */ | |
586 | { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b110), | |
587 | trap_dbgauthstatus_el1 }, | |
588 | ||
0c557ed4 MZ |
589 | /* MDCCSR_EL1 */ |
590 | { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0001), Op2(0b000), | |
591 | trap_raz_wi }, | |
592 | /* DBGDTR_EL0 */ | |
593 | { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0100), Op2(0b000), | |
594 | trap_raz_wi }, | |
595 | /* DBGDTR[TR]X_EL0 */ | |
596 | { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0101), Op2(0b000), | |
597 | trap_raz_wi }, | |
598 | ||
62a89c44 MZ |
599 | /* DBGVCR32_EL2 */ |
600 | { Op0(0b10), Op1(0b100), CRn(0b0000), CRm(0b0111), Op2(0b000), | |
601 | NULL, reset_val, DBGVCR32_EL2, 0 }, | |
602 | ||
7c8c5e6a MZ |
603 | /* MPIDR_EL1 */ |
604 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b101), | |
605 | NULL, reset_mpidr, MPIDR_EL1 }, | |
606 | /* SCTLR_EL1 */ | |
607 | { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), | |
3c1e7165 | 608 | access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, |
7c8c5e6a MZ |
609 | /* CPACR_EL1 */ |
610 | { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b010), | |
611 | NULL, reset_val, CPACR_EL1, 0 }, | |
612 | /* TTBR0_EL1 */ | |
613 | { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b000), | |
4d44923b | 614 | access_vm_reg, reset_unknown, TTBR0_EL1 }, |
7c8c5e6a MZ |
615 | /* TTBR1_EL1 */ |
616 | { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b001), | |
4d44923b | 617 | access_vm_reg, reset_unknown, TTBR1_EL1 }, |
7c8c5e6a MZ |
618 | /* TCR_EL1 */ |
619 | { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b010), | |
4d44923b | 620 | access_vm_reg, reset_val, TCR_EL1, 0 }, |
7c8c5e6a MZ |
621 | |
622 | /* AFSR0_EL1 */ | |
623 | { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b000), | |
4d44923b | 624 | access_vm_reg, reset_unknown, AFSR0_EL1 }, |
7c8c5e6a MZ |
625 | /* AFSR1_EL1 */ |
626 | { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b001), | |
4d44923b | 627 | access_vm_reg, reset_unknown, AFSR1_EL1 }, |
7c8c5e6a MZ |
628 | /* ESR_EL1 */ |
629 | { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0010), Op2(0b000), | |
4d44923b | 630 | access_vm_reg, reset_unknown, ESR_EL1 }, |
7c8c5e6a MZ |
631 | /* FAR_EL1 */ |
632 | { Op0(0b11), Op1(0b000), CRn(0b0110), CRm(0b0000), Op2(0b000), | |
4d44923b | 633 | access_vm_reg, reset_unknown, FAR_EL1 }, |
1bbd8054 MZ |
634 | /* PAR_EL1 */ |
635 | { Op0(0b11), Op1(0b000), CRn(0b0111), CRm(0b0100), Op2(0b000), | |
636 | NULL, reset_unknown, PAR_EL1 }, | |
7c8c5e6a MZ |
637 | |
638 | /* PMINTENSET_EL1 */ | |
639 | { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b001), | |
7609c125 | 640 | trap_raz_wi }, |
7c8c5e6a MZ |
641 | /* PMINTENCLR_EL1 */ |
642 | { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b010), | |
7609c125 | 643 | trap_raz_wi }, |
7c8c5e6a MZ |
644 | |
645 | /* MAIR_EL1 */ | |
646 | { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0010), Op2(0b000), | |
4d44923b | 647 | access_vm_reg, reset_unknown, MAIR_EL1 }, |
7c8c5e6a MZ |
648 | /* AMAIR_EL1 */ |
649 | { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0011), Op2(0b000), | |
4d44923b | 650 | access_vm_reg, reset_amair_el1, AMAIR_EL1 }, |
7c8c5e6a MZ |
651 | |
652 | /* VBAR_EL1 */ | |
653 | { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b0000), Op2(0b000), | |
654 | NULL, reset_val, VBAR_EL1, 0 }, | |
db7dedd0 | 655 | |
6d52f35a AP |
656 | /* ICC_SGI1R_EL1 */ |
657 | { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1011), Op2(0b101), | |
658 | access_gic_sgi }, | |
db7dedd0 CD |
659 | /* ICC_SRE_EL1 */ |
660 | { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1100), Op2(0b101), | |
661 | trap_raz_wi }, | |
662 | ||
7c8c5e6a MZ |
663 | /* CONTEXTIDR_EL1 */ |
664 | { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b001), | |
4d44923b | 665 | access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, |
7c8c5e6a MZ |
666 | /* TPIDR_EL1 */ |
667 | { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b100), | |
668 | NULL, reset_unknown, TPIDR_EL1 }, | |
669 | ||
670 | /* CNTKCTL_EL1 */ | |
671 | { Op0(0b11), Op1(0b000), CRn(0b1110), CRm(0b0001), Op2(0b000), | |
672 | NULL, reset_val, CNTKCTL_EL1, 0}, | |
673 | ||
674 | /* CSSELR_EL1 */ | |
675 | { Op0(0b11), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000), | |
676 | NULL, reset_unknown, CSSELR_EL1 }, | |
677 | ||
678 | /* PMCR_EL0 */ | |
679 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b000), | |
ab946834 | 680 | access_pmcr, reset_pmcr, }, |
7c8c5e6a MZ |
681 | /* PMCNTENSET_EL0 */ |
682 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b001), | |
7609c125 | 683 | trap_raz_wi }, |
7c8c5e6a MZ |
684 | /* PMCNTENCLR_EL0 */ |
685 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b010), | |
7609c125 | 686 | trap_raz_wi }, |
7c8c5e6a MZ |
687 | /* PMOVSCLR_EL0 */ |
688 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b011), | |
7609c125 | 689 | trap_raz_wi }, |
7c8c5e6a MZ |
690 | /* PMSWINC_EL0 */ |
691 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b100), | |
7609c125 | 692 | trap_raz_wi }, |
7c8c5e6a MZ |
693 | /* PMSELR_EL0 */ |
694 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101), | |
3965c3ce | 695 | access_pmselr, reset_unknown, PMSELR_EL0 }, |
7c8c5e6a MZ |
696 | /* PMCEID0_EL0 */ |
697 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110), | |
7609c125 | 698 | trap_raz_wi }, |
7c8c5e6a MZ |
699 | /* PMCEID1_EL0 */ |
700 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111), | |
7609c125 | 701 | trap_raz_wi }, |
7c8c5e6a MZ |
702 | /* PMCCNTR_EL0 */ |
703 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000), | |
7609c125 | 704 | trap_raz_wi }, |
7c8c5e6a MZ |
705 | /* PMXEVTYPER_EL0 */ |
706 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001), | |
7609c125 | 707 | trap_raz_wi }, |
7c8c5e6a MZ |
708 | /* PMXEVCNTR_EL0 */ |
709 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b010), | |
7609c125 | 710 | trap_raz_wi }, |
7c8c5e6a MZ |
711 | /* PMUSERENR_EL0 */ |
712 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b000), | |
7609c125 | 713 | trap_raz_wi }, |
7c8c5e6a MZ |
714 | /* PMOVSSET_EL0 */ |
715 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b011), | |
7609c125 | 716 | trap_raz_wi }, |
7c8c5e6a MZ |
717 | |
718 | /* TPIDR_EL0 */ | |
719 | { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b010), | |
720 | NULL, reset_unknown, TPIDR_EL0 }, | |
721 | /* TPIDRRO_EL0 */ | |
722 | { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b011), | |
723 | NULL, reset_unknown, TPIDRRO_EL0 }, | |
62a89c44 MZ |
724 | |
725 | /* DACR32_EL2 */ | |
726 | { Op0(0b11), Op1(0b100), CRn(0b0011), CRm(0b0000), Op2(0b000), | |
727 | NULL, reset_unknown, DACR32_EL2 }, | |
728 | /* IFSR32_EL2 */ | |
729 | { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0000), Op2(0b001), | |
730 | NULL, reset_unknown, IFSR32_EL2 }, | |
731 | /* FPEXC32_EL2 */ | |
732 | { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0011), Op2(0b000), | |
733 | NULL, reset_val, FPEXC32_EL2, 0x70 }, | |
734 | }; | |
735 | ||
bdfb4b38 | 736 | static bool trap_dbgidr(struct kvm_vcpu *vcpu, |
3fec037d | 737 | struct sys_reg_params *p, |
bdfb4b38 MZ |
738 | const struct sys_reg_desc *r) |
739 | { | |
740 | if (p->is_write) { | |
741 | return ignore_write(vcpu, p); | |
742 | } else { | |
4db8e5ea SP |
743 | u64 dfr = read_system_reg(SYS_ID_AA64DFR0_EL1); |
744 | u64 pfr = read_system_reg(SYS_ID_AA64PFR0_EL1); | |
745 | u32 el3 = !!cpuid_feature_extract_field(pfr, ID_AA64PFR0_EL3_SHIFT); | |
bdfb4b38 | 746 | |
2ec5be3d PF |
747 | p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) | |
748 | (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) | | |
749 | (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20) | |
750 | | (6 << 16) | (el3 << 14) | (el3 << 12)); | |
bdfb4b38 MZ |
751 | return true; |
752 | } | |
753 | } | |
754 | ||
755 | static bool trap_debug32(struct kvm_vcpu *vcpu, | |
3fec037d | 756 | struct sys_reg_params *p, |
bdfb4b38 MZ |
757 | const struct sys_reg_desc *r) |
758 | { | |
759 | if (p->is_write) { | |
2ec5be3d | 760 | vcpu_cp14(vcpu, r->reg) = p->regval; |
bdfb4b38 MZ |
761 | vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; |
762 | } else { | |
2ec5be3d | 763 | p->regval = vcpu_cp14(vcpu, r->reg); |
bdfb4b38 MZ |
764 | } |
765 | ||
766 | return true; | |
767 | } | |
768 | ||
84e690bf AB |
769 | /* AArch32 debug register mappings |
770 | * | |
771 | * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0] | |
772 | * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32] | |
773 | * | |
774 | * All control registers and watchpoint value registers are mapped to | |
775 | * the lower 32 bits of their AArch64 equivalents. We share the trap | |
776 | * handlers with the above AArch64 code which checks what mode the | |
777 | * system is in. | |
778 | */ | |
779 | ||
281243cb MZ |
780 | static bool trap_xvr(struct kvm_vcpu *vcpu, |
781 | struct sys_reg_params *p, | |
782 | const struct sys_reg_desc *rd) | |
84e690bf AB |
783 | { |
784 | u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; | |
785 | ||
786 | if (p->is_write) { | |
787 | u64 val = *dbg_reg; | |
788 | ||
789 | val &= 0xffffffffUL; | |
2ec5be3d | 790 | val |= p->regval << 32; |
84e690bf AB |
791 | *dbg_reg = val; |
792 | ||
793 | vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; | |
794 | } else { | |
2ec5be3d | 795 | p->regval = *dbg_reg >> 32; |
84e690bf AB |
796 | } |
797 | ||
eef8c85a AB |
798 | trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); |
799 | ||
84e690bf AB |
800 | return true; |
801 | } | |
802 | ||
803 | #define DBG_BCR_BVR_WCR_WVR(n) \ | |
804 | /* DBGBVRn */ \ | |
805 | { Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \ | |
806 | /* DBGBCRn */ \ | |
807 | { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n }, \ | |
808 | /* DBGWVRn */ \ | |
809 | { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n }, \ | |
810 | /* DBGWCRn */ \ | |
811 | { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n } | |
812 | ||
813 | #define DBGBXVR(n) \ | |
814 | { Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_xvr, NULL, n } | |
bdfb4b38 MZ |
815 | |
816 | /* | |
817 | * Trapped cp14 registers. We generally ignore most of the external | |
818 | * debug, on the principle that they don't really make sense to a | |
84e690bf | 819 | * guest. Revisit this one day, would this principle change. |
bdfb4b38 | 820 | */ |
72564016 | 821 | static const struct sys_reg_desc cp14_regs[] = { |
bdfb4b38 MZ |
822 | /* DBGIDR */ |
823 | { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgidr }, | |
824 | /* DBGDTRRXext */ | |
825 | { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi }, | |
826 | ||
827 | DBG_BCR_BVR_WCR_WVR(0), | |
828 | /* DBGDSCRint */ | |
829 | { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi }, | |
830 | DBG_BCR_BVR_WCR_WVR(1), | |
831 | /* DBGDCCINT */ | |
832 | { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug32 }, | |
833 | /* DBGDSCRext */ | |
834 | { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug32 }, | |
835 | DBG_BCR_BVR_WCR_WVR(2), | |
836 | /* DBGDTR[RT]Xint */ | |
837 | { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi }, | |
838 | /* DBGDTR[RT]Xext */ | |
839 | { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi }, | |
840 | DBG_BCR_BVR_WCR_WVR(3), | |
841 | DBG_BCR_BVR_WCR_WVR(4), | |
842 | DBG_BCR_BVR_WCR_WVR(5), | |
843 | /* DBGWFAR */ | |
844 | { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi }, | |
845 | /* DBGOSECCR */ | |
846 | { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi }, | |
847 | DBG_BCR_BVR_WCR_WVR(6), | |
848 | /* DBGVCR */ | |
849 | { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug32 }, | |
850 | DBG_BCR_BVR_WCR_WVR(7), | |
851 | DBG_BCR_BVR_WCR_WVR(8), | |
852 | DBG_BCR_BVR_WCR_WVR(9), | |
853 | DBG_BCR_BVR_WCR_WVR(10), | |
854 | DBG_BCR_BVR_WCR_WVR(11), | |
855 | DBG_BCR_BVR_WCR_WVR(12), | |
856 | DBG_BCR_BVR_WCR_WVR(13), | |
857 | DBG_BCR_BVR_WCR_WVR(14), | |
858 | DBG_BCR_BVR_WCR_WVR(15), | |
859 | ||
860 | /* DBGDRAR (32bit) */ | |
861 | { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi }, | |
862 | ||
863 | DBGBXVR(0), | |
864 | /* DBGOSLAR */ | |
865 | { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_raz_wi }, | |
866 | DBGBXVR(1), | |
867 | /* DBGOSLSR */ | |
868 | { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1 }, | |
869 | DBGBXVR(2), | |
870 | DBGBXVR(3), | |
871 | /* DBGOSDLR */ | |
872 | { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi }, | |
873 | DBGBXVR(4), | |
874 | /* DBGPRCR */ | |
875 | { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi }, | |
876 | DBGBXVR(5), | |
877 | DBGBXVR(6), | |
878 | DBGBXVR(7), | |
879 | DBGBXVR(8), | |
880 | DBGBXVR(9), | |
881 | DBGBXVR(10), | |
882 | DBGBXVR(11), | |
883 | DBGBXVR(12), | |
884 | DBGBXVR(13), | |
885 | DBGBXVR(14), | |
886 | DBGBXVR(15), | |
887 | ||
888 | /* DBGDSAR (32bit) */ | |
889 | { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi }, | |
890 | ||
891 | /* DBGDEVID2 */ | |
892 | { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi }, | |
893 | /* DBGDEVID1 */ | |
894 | { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi }, | |
895 | /* DBGDEVID */ | |
896 | { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi }, | |
897 | /* DBGCLAIMSET */ | |
898 | { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi }, | |
899 | /* DBGCLAIMCLR */ | |
900 | { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi }, | |
901 | /* DBGAUTHSTATUS */ | |
902 | { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 }, | |
72564016 MZ |
903 | }; |
904 | ||
a9866ba0 MZ |
905 | /* Trapped cp14 64bit registers */ |
906 | static const struct sys_reg_desc cp14_64_regs[] = { | |
bdfb4b38 MZ |
907 | /* DBGDRAR (64bit) */ |
908 | { Op1( 0), CRm( 1), .access = trap_raz_wi }, | |
909 | ||
910 | /* DBGDSAR (64bit) */ | |
911 | { Op1( 0), CRm( 2), .access = trap_raz_wi }, | |
a9866ba0 MZ |
912 | }; |
913 | ||
4d44923b MZ |
914 | /* |
915 | * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding, | |
916 | * depending on the way they are accessed (as a 32bit or a 64bit | |
917 | * register). | |
918 | */ | |
62a89c44 | 919 | static const struct sys_reg_desc cp15_regs[] = { |
6d52f35a AP |
920 | { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, |
921 | ||
3c1e7165 | 922 | { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, c1_SCTLR }, |
4d44923b MZ |
923 | { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, |
924 | { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 }, | |
925 | { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR }, | |
926 | { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR }, | |
927 | { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR }, | |
928 | { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR }, | |
929 | { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, c5_ADFSR }, | |
930 | { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, c5_AIFSR }, | |
931 | { Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, c6_DFAR }, | |
932 | { Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, c6_IFAR }, | |
933 | ||
62a89c44 MZ |
934 | /* |
935 | * DC{C,I,CI}SW operations: | |
936 | */ | |
937 | { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, | |
938 | { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, | |
939 | { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, | |
4d44923b | 940 | |
7609c125 | 941 | /* PMU */ |
ab946834 | 942 | { Op1( 0), CRn( 9), CRm(12), Op2( 0), access_pmcr }, |
7609c125 MZ |
943 | { Op1( 0), CRn( 9), CRm(12), Op2( 1), trap_raz_wi }, |
944 | { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi }, | |
945 | { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi }, | |
3965c3ce | 946 | { Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr }, |
7609c125 MZ |
947 | { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi }, |
948 | { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi }, | |
949 | { Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi }, | |
950 | { Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi }, | |
951 | { Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi }, | |
952 | { Op1( 0), CRn( 9), CRm(14), Op2( 0), trap_raz_wi }, | |
953 | { Op1( 0), CRn( 9), CRm(14), Op2( 1), trap_raz_wi }, | |
954 | { Op1( 0), CRn( 9), CRm(14), Op2( 2), trap_raz_wi }, | |
4d44923b MZ |
955 | |
956 | { Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, c10_PRRR }, | |
957 | { Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, c10_NMRR }, | |
958 | { Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, c10_AMAIR0 }, | |
959 | { Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, c10_AMAIR1 }, | |
db7dedd0 CD |
960 | |
961 | /* ICC_SRE */ | |
962 | { Op1( 0), CRn(12), CRm(12), Op2( 5), trap_raz_wi }, | |
963 | ||
4d44923b | 964 | { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID }, |
a9866ba0 MZ |
965 | }; |
966 | ||
967 | static const struct sys_reg_desc cp15_64_regs[] = { | |
968 | { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, | |
6d52f35a | 969 | { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, |
4d44923b | 970 | { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 }, |
7c8c5e6a MZ |
971 | }; |
972 | ||
973 | /* Target specific emulation tables */ | |
974 | static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS]; | |
975 | ||
976 | void kvm_register_target_sys_reg_table(unsigned int target, | |
977 | struct kvm_sys_reg_target_table *table) | |
978 | { | |
979 | target_tables[target] = table; | |
980 | } | |
981 | ||
982 | /* Get specific register table for this target. */ | |
62a89c44 MZ |
983 | static const struct sys_reg_desc *get_target_table(unsigned target, |
984 | bool mode_is_64, | |
985 | size_t *num) | |
7c8c5e6a MZ |
986 | { |
987 | struct kvm_sys_reg_target_table *table; | |
988 | ||
989 | table = target_tables[target]; | |
62a89c44 MZ |
990 | if (mode_is_64) { |
991 | *num = table->table64.num; | |
992 | return table->table64.table; | |
993 | } else { | |
994 | *num = table->table32.num; | |
995 | return table->table32.table; | |
996 | } | |
7c8c5e6a MZ |
997 | } |
998 | ||
999 | static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params, | |
1000 | const struct sys_reg_desc table[], | |
1001 | unsigned int num) | |
1002 | { | |
1003 | unsigned int i; | |
1004 | ||
1005 | for (i = 0; i < num; i++) { | |
1006 | const struct sys_reg_desc *r = &table[i]; | |
1007 | ||
1008 | if (params->Op0 != r->Op0) | |
1009 | continue; | |
1010 | if (params->Op1 != r->Op1) | |
1011 | continue; | |
1012 | if (params->CRn != r->CRn) | |
1013 | continue; | |
1014 | if (params->CRm != r->CRm) | |
1015 | continue; | |
1016 | if (params->Op2 != r->Op2) | |
1017 | continue; | |
1018 | ||
1019 | return r; | |
1020 | } | |
1021 | return NULL; | |
1022 | } | |
1023 | ||
62a89c44 MZ |
1024 | int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run) |
1025 | { | |
1026 | kvm_inject_undefined(vcpu); | |
1027 | return 1; | |
1028 | } | |
1029 | ||
72564016 MZ |
1030 | /* |
1031 | * emulate_cp -- tries to match a sys_reg access in a handling table, and | |
1032 | * call the corresponding trap handler. | |
1033 | * | |
1034 | * @params: pointer to the descriptor of the access | |
1035 | * @table: array of trap descriptors | |
1036 | * @num: size of the trap descriptor array | |
1037 | * | |
1038 | * Return 0 if the access has been handled, and -1 if not. | |
1039 | */ | |
1040 | static int emulate_cp(struct kvm_vcpu *vcpu, | |
3fec037d | 1041 | struct sys_reg_params *params, |
72564016 MZ |
1042 | const struct sys_reg_desc *table, |
1043 | size_t num) | |
62a89c44 | 1044 | { |
72564016 | 1045 | const struct sys_reg_desc *r; |
62a89c44 | 1046 | |
72564016 MZ |
1047 | if (!table) |
1048 | return -1; /* Not handled */ | |
62a89c44 | 1049 | |
62a89c44 | 1050 | r = find_reg(params, table, num); |
62a89c44 | 1051 | |
72564016 | 1052 | if (r) { |
62a89c44 MZ |
1053 | /* |
1054 | * Not having an accessor means that we have | |
1055 | * configured a trap that we don't know how to | |
1056 | * handle. This certainly qualifies as a gross bug | |
1057 | * that should be fixed right away. | |
1058 | */ | |
1059 | BUG_ON(!r->access); | |
1060 | ||
1061 | if (likely(r->access(vcpu, params, r))) { | |
1062 | /* Skip instruction, since it was emulated */ | |
1063 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
6327f35a SZ |
1064 | /* Handled */ |
1065 | return 0; | |
62a89c44 | 1066 | } |
72564016 MZ |
1067 | } |
1068 | ||
1069 | /* Not handled */ | |
1070 | return -1; | |
1071 | } | |
1072 | ||
1073 | static void unhandled_cp_access(struct kvm_vcpu *vcpu, | |
1074 | struct sys_reg_params *params) | |
1075 | { | |
1076 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
1077 | int cp; | |
1078 | ||
1079 | switch(hsr_ec) { | |
c6d01a94 MR |
1080 | case ESR_ELx_EC_CP15_32: |
1081 | case ESR_ELx_EC_CP15_64: | |
72564016 MZ |
1082 | cp = 15; |
1083 | break; | |
c6d01a94 MR |
1084 | case ESR_ELx_EC_CP14_MR: |
1085 | case ESR_ELx_EC_CP14_64: | |
72564016 MZ |
1086 | cp = 14; |
1087 | break; | |
1088 | default: | |
1089 | WARN_ON((cp = -1)); | |
62a89c44 MZ |
1090 | } |
1091 | ||
72564016 MZ |
1092 | kvm_err("Unsupported guest CP%d access at: %08lx\n", |
1093 | cp, *vcpu_pc(vcpu)); | |
62a89c44 MZ |
1094 | print_sys_reg_instr(params); |
1095 | kvm_inject_undefined(vcpu); | |
1096 | } | |
1097 | ||
1098 | /** | |
7769db90 | 1099 | * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access |
62a89c44 MZ |
1100 | * @vcpu: The VCPU pointer |
1101 | * @run: The kvm_run struct | |
1102 | */ | |
72564016 MZ |
1103 | static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, |
1104 | const struct sys_reg_desc *global, | |
1105 | size_t nr_global, | |
1106 | const struct sys_reg_desc *target_specific, | |
1107 | size_t nr_specific) | |
62a89c44 MZ |
1108 | { |
1109 | struct sys_reg_params params; | |
1110 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
2ec5be3d | 1111 | int Rt = (hsr >> 5) & 0xf; |
62a89c44 MZ |
1112 | int Rt2 = (hsr >> 10) & 0xf; |
1113 | ||
2072d29c MZ |
1114 | params.is_aarch32 = true; |
1115 | params.is_32bit = false; | |
62a89c44 | 1116 | params.CRm = (hsr >> 1) & 0xf; |
62a89c44 MZ |
1117 | params.is_write = ((hsr & 1) == 0); |
1118 | ||
1119 | params.Op0 = 0; | |
1120 | params.Op1 = (hsr >> 16) & 0xf; | |
1121 | params.Op2 = 0; | |
1122 | params.CRn = 0; | |
1123 | ||
1124 | /* | |
2ec5be3d | 1125 | * Make a 64-bit value out of Rt and Rt2. As we use the same trap |
62a89c44 MZ |
1126 | * backends between AArch32 and AArch64, we get away with it. |
1127 | */ | |
1128 | if (params.is_write) { | |
2ec5be3d PF |
1129 | params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff; |
1130 | params.regval |= vcpu_get_reg(vcpu, Rt2) << 32; | |
62a89c44 MZ |
1131 | } |
1132 | ||
72564016 MZ |
1133 | if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific)) |
1134 | goto out; | |
1135 | if (!emulate_cp(vcpu, ¶ms, global, nr_global)) | |
1136 | goto out; | |
1137 | ||
1138 | unhandled_cp_access(vcpu, ¶ms); | |
62a89c44 | 1139 | |
72564016 | 1140 | out: |
2ec5be3d | 1141 | /* Split up the value between registers for the read side */ |
62a89c44 | 1142 | if (!params.is_write) { |
2ec5be3d PF |
1143 | vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval)); |
1144 | vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval)); | |
62a89c44 MZ |
1145 | } |
1146 | ||
1147 | return 1; | |
1148 | } | |
1149 | ||
1150 | /** | |
7769db90 | 1151 | * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access |
62a89c44 MZ |
1152 | * @vcpu: The VCPU pointer |
1153 | * @run: The kvm_run struct | |
1154 | */ | |
72564016 MZ |
1155 | static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, |
1156 | const struct sys_reg_desc *global, | |
1157 | size_t nr_global, | |
1158 | const struct sys_reg_desc *target_specific, | |
1159 | size_t nr_specific) | |
62a89c44 MZ |
1160 | { |
1161 | struct sys_reg_params params; | |
1162 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
2ec5be3d | 1163 | int Rt = (hsr >> 5) & 0xf; |
62a89c44 | 1164 | |
2072d29c MZ |
1165 | params.is_aarch32 = true; |
1166 | params.is_32bit = true; | |
62a89c44 | 1167 | params.CRm = (hsr >> 1) & 0xf; |
2ec5be3d | 1168 | params.regval = vcpu_get_reg(vcpu, Rt); |
62a89c44 MZ |
1169 | params.is_write = ((hsr & 1) == 0); |
1170 | params.CRn = (hsr >> 10) & 0xf; | |
1171 | params.Op0 = 0; | |
1172 | params.Op1 = (hsr >> 14) & 0x7; | |
1173 | params.Op2 = (hsr >> 17) & 0x7; | |
1174 | ||
2ec5be3d PF |
1175 | if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific) || |
1176 | !emulate_cp(vcpu, ¶ms, global, nr_global)) { | |
1177 | if (!params.is_write) | |
1178 | vcpu_set_reg(vcpu, Rt, params.regval); | |
72564016 | 1179 | return 1; |
2ec5be3d | 1180 | } |
72564016 MZ |
1181 | |
1182 | unhandled_cp_access(vcpu, ¶ms); | |
62a89c44 MZ |
1183 | return 1; |
1184 | } | |
1185 | ||
72564016 MZ |
1186 | int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run) |
1187 | { | |
1188 | const struct sys_reg_desc *target_specific; | |
1189 | size_t num; | |
1190 | ||
1191 | target_specific = get_target_table(vcpu->arch.target, false, &num); | |
1192 | return kvm_handle_cp_64(vcpu, | |
a9866ba0 | 1193 | cp15_64_regs, ARRAY_SIZE(cp15_64_regs), |
72564016 MZ |
1194 | target_specific, num); |
1195 | } | |
1196 | ||
1197 | int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
1198 | { | |
1199 | const struct sys_reg_desc *target_specific; | |
1200 | size_t num; | |
1201 | ||
1202 | target_specific = get_target_table(vcpu->arch.target, false, &num); | |
1203 | return kvm_handle_cp_32(vcpu, | |
1204 | cp15_regs, ARRAY_SIZE(cp15_regs), | |
1205 | target_specific, num); | |
1206 | } | |
1207 | ||
1208 | int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
1209 | { | |
1210 | return kvm_handle_cp_64(vcpu, | |
a9866ba0 | 1211 | cp14_64_regs, ARRAY_SIZE(cp14_64_regs), |
72564016 MZ |
1212 | NULL, 0); |
1213 | } | |
1214 | ||
1215 | int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
1216 | { | |
1217 | return kvm_handle_cp_32(vcpu, | |
1218 | cp14_regs, ARRAY_SIZE(cp14_regs), | |
1219 | NULL, 0); | |
1220 | } | |
1221 | ||
7c8c5e6a | 1222 | static int emulate_sys_reg(struct kvm_vcpu *vcpu, |
3fec037d | 1223 | struct sys_reg_params *params) |
7c8c5e6a MZ |
1224 | { |
1225 | size_t num; | |
1226 | const struct sys_reg_desc *table, *r; | |
1227 | ||
62a89c44 | 1228 | table = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
1229 | |
1230 | /* Search target-specific then generic table. */ | |
1231 | r = find_reg(params, table, num); | |
1232 | if (!r) | |
1233 | r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); | |
1234 | ||
1235 | if (likely(r)) { | |
1236 | /* | |
1237 | * Not having an accessor means that we have | |
1238 | * configured a trap that we don't know how to | |
1239 | * handle. This certainly qualifies as a gross bug | |
1240 | * that should be fixed right away. | |
1241 | */ | |
1242 | BUG_ON(!r->access); | |
1243 | ||
1244 | if (likely(r->access(vcpu, params, r))) { | |
1245 | /* Skip instruction, since it was emulated */ | |
1246 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
1247 | return 1; | |
1248 | } | |
1249 | /* If access function fails, it should complain. */ | |
1250 | } else { | |
1251 | kvm_err("Unsupported guest sys_reg access at: %lx\n", | |
1252 | *vcpu_pc(vcpu)); | |
1253 | print_sys_reg_instr(params); | |
1254 | } | |
1255 | kvm_inject_undefined(vcpu); | |
1256 | return 1; | |
1257 | } | |
1258 | ||
1259 | static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, | |
1260 | const struct sys_reg_desc *table, size_t num) | |
1261 | { | |
1262 | unsigned long i; | |
1263 | ||
1264 | for (i = 0; i < num; i++) | |
1265 | if (table[i].reset) | |
1266 | table[i].reset(vcpu, &table[i]); | |
1267 | } | |
1268 | ||
1269 | /** | |
1270 | * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access | |
1271 | * @vcpu: The VCPU pointer | |
1272 | * @run: The kvm_run struct | |
1273 | */ | |
1274 | int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
1275 | { | |
1276 | struct sys_reg_params params; | |
1277 | unsigned long esr = kvm_vcpu_get_hsr(vcpu); | |
2ec5be3d PF |
1278 | int Rt = (esr >> 5) & 0x1f; |
1279 | int ret; | |
7c8c5e6a | 1280 | |
eef8c85a AB |
1281 | trace_kvm_handle_sys_reg(esr); |
1282 | ||
2072d29c MZ |
1283 | params.is_aarch32 = false; |
1284 | params.is_32bit = false; | |
7c8c5e6a MZ |
1285 | params.Op0 = (esr >> 20) & 3; |
1286 | params.Op1 = (esr >> 14) & 0x7; | |
1287 | params.CRn = (esr >> 10) & 0xf; | |
1288 | params.CRm = (esr >> 1) & 0xf; | |
1289 | params.Op2 = (esr >> 17) & 0x7; | |
2ec5be3d | 1290 | params.regval = vcpu_get_reg(vcpu, Rt); |
7c8c5e6a MZ |
1291 | params.is_write = !(esr & 1); |
1292 | ||
2ec5be3d PF |
1293 | ret = emulate_sys_reg(vcpu, ¶ms); |
1294 | ||
1295 | if (!params.is_write) | |
1296 | vcpu_set_reg(vcpu, Rt, params.regval); | |
1297 | return ret; | |
7c8c5e6a MZ |
1298 | } |
1299 | ||
1300 | /****************************************************************************** | |
1301 | * Userspace API | |
1302 | *****************************************************************************/ | |
1303 | ||
1304 | static bool index_to_params(u64 id, struct sys_reg_params *params) | |
1305 | { | |
1306 | switch (id & KVM_REG_SIZE_MASK) { | |
1307 | case KVM_REG_SIZE_U64: | |
1308 | /* Any unused index bits means it's not valid. */ | |
1309 | if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | |
1310 | | KVM_REG_ARM_COPROC_MASK | |
1311 | | KVM_REG_ARM64_SYSREG_OP0_MASK | |
1312 | | KVM_REG_ARM64_SYSREG_OP1_MASK | |
1313 | | KVM_REG_ARM64_SYSREG_CRN_MASK | |
1314 | | KVM_REG_ARM64_SYSREG_CRM_MASK | |
1315 | | KVM_REG_ARM64_SYSREG_OP2_MASK)) | |
1316 | return false; | |
1317 | params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) | |
1318 | >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); | |
1319 | params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) | |
1320 | >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); | |
1321 | params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) | |
1322 | >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); | |
1323 | params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) | |
1324 | >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); | |
1325 | params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) | |
1326 | >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); | |
1327 | return true; | |
1328 | default: | |
1329 | return false; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | /* Decode an index value, and find the sys_reg_desc entry. */ | |
1334 | static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu, | |
1335 | u64 id) | |
1336 | { | |
1337 | size_t num; | |
1338 | const struct sys_reg_desc *table, *r; | |
1339 | struct sys_reg_params params; | |
1340 | ||
1341 | /* We only do sys_reg for now. */ | |
1342 | if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) | |
1343 | return NULL; | |
1344 | ||
1345 | if (!index_to_params(id, ¶ms)) | |
1346 | return NULL; | |
1347 | ||
62a89c44 | 1348 | table = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
1349 | r = find_reg(¶ms, table, num); |
1350 | if (!r) | |
1351 | r = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); | |
1352 | ||
1353 | /* Not saved in the sys_reg array? */ | |
1354 | if (r && !r->reg) | |
1355 | r = NULL; | |
1356 | ||
1357 | return r; | |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * These are the invariant sys_reg registers: we let the guest see the | |
1362 | * host versions of these, so they're part of the guest state. | |
1363 | * | |
1364 | * A future CPU may provide a mechanism to present different values to | |
1365 | * the guest, or a future kvm may trap them. | |
1366 | */ | |
1367 | ||
1368 | #define FUNCTION_INVARIANT(reg) \ | |
1369 | static void get_##reg(struct kvm_vcpu *v, \ | |
1370 | const struct sys_reg_desc *r) \ | |
1371 | { \ | |
1372 | u64 val; \ | |
1373 | \ | |
1374 | asm volatile("mrs %0, " __stringify(reg) "\n" \ | |
1375 | : "=r" (val)); \ | |
1376 | ((struct sys_reg_desc *)r)->val = val; \ | |
1377 | } | |
1378 | ||
1379 | FUNCTION_INVARIANT(midr_el1) | |
1380 | FUNCTION_INVARIANT(ctr_el0) | |
1381 | FUNCTION_INVARIANT(revidr_el1) | |
1382 | FUNCTION_INVARIANT(id_pfr0_el1) | |
1383 | FUNCTION_INVARIANT(id_pfr1_el1) | |
1384 | FUNCTION_INVARIANT(id_dfr0_el1) | |
1385 | FUNCTION_INVARIANT(id_afr0_el1) | |
1386 | FUNCTION_INVARIANT(id_mmfr0_el1) | |
1387 | FUNCTION_INVARIANT(id_mmfr1_el1) | |
1388 | FUNCTION_INVARIANT(id_mmfr2_el1) | |
1389 | FUNCTION_INVARIANT(id_mmfr3_el1) | |
1390 | FUNCTION_INVARIANT(id_isar0_el1) | |
1391 | FUNCTION_INVARIANT(id_isar1_el1) | |
1392 | FUNCTION_INVARIANT(id_isar2_el1) | |
1393 | FUNCTION_INVARIANT(id_isar3_el1) | |
1394 | FUNCTION_INVARIANT(id_isar4_el1) | |
1395 | FUNCTION_INVARIANT(id_isar5_el1) | |
1396 | FUNCTION_INVARIANT(clidr_el1) | |
1397 | FUNCTION_INVARIANT(aidr_el1) | |
1398 | ||
1399 | /* ->val is filled in by kvm_sys_reg_table_init() */ | |
1400 | static struct sys_reg_desc invariant_sys_regs[] = { | |
1401 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b000), | |
1402 | NULL, get_midr_el1 }, | |
1403 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b110), | |
1404 | NULL, get_revidr_el1 }, | |
1405 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b000), | |
1406 | NULL, get_id_pfr0_el1 }, | |
1407 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b001), | |
1408 | NULL, get_id_pfr1_el1 }, | |
1409 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b010), | |
1410 | NULL, get_id_dfr0_el1 }, | |
1411 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b011), | |
1412 | NULL, get_id_afr0_el1 }, | |
1413 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b100), | |
1414 | NULL, get_id_mmfr0_el1 }, | |
1415 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b101), | |
1416 | NULL, get_id_mmfr1_el1 }, | |
1417 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b110), | |
1418 | NULL, get_id_mmfr2_el1 }, | |
1419 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b111), | |
1420 | NULL, get_id_mmfr3_el1 }, | |
1421 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), | |
1422 | NULL, get_id_isar0_el1 }, | |
1423 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b001), | |
1424 | NULL, get_id_isar1_el1 }, | |
1425 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), | |
1426 | NULL, get_id_isar2_el1 }, | |
1427 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b011), | |
1428 | NULL, get_id_isar3_el1 }, | |
1429 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b100), | |
1430 | NULL, get_id_isar4_el1 }, | |
1431 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b101), | |
1432 | NULL, get_id_isar5_el1 }, | |
1433 | { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b001), | |
1434 | NULL, get_clidr_el1 }, | |
1435 | { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b111), | |
1436 | NULL, get_aidr_el1 }, | |
1437 | { Op0(0b11), Op1(0b011), CRn(0b0000), CRm(0b0000), Op2(0b001), | |
1438 | NULL, get_ctr_el0 }, | |
1439 | }; | |
1440 | ||
26c99af1 | 1441 | static int reg_from_user(u64 *val, const void __user *uaddr, u64 id) |
7c8c5e6a | 1442 | { |
7c8c5e6a MZ |
1443 | if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0) |
1444 | return -EFAULT; | |
1445 | return 0; | |
1446 | } | |
1447 | ||
26c99af1 | 1448 | static int reg_to_user(void __user *uaddr, const u64 *val, u64 id) |
7c8c5e6a | 1449 | { |
7c8c5e6a MZ |
1450 | if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0) |
1451 | return -EFAULT; | |
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | static int get_invariant_sys_reg(u64 id, void __user *uaddr) | |
1456 | { | |
1457 | struct sys_reg_params params; | |
1458 | const struct sys_reg_desc *r; | |
1459 | ||
1460 | if (!index_to_params(id, ¶ms)) | |
1461 | return -ENOENT; | |
1462 | ||
1463 | r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); | |
1464 | if (!r) | |
1465 | return -ENOENT; | |
1466 | ||
1467 | return reg_to_user(uaddr, &r->val, id); | |
1468 | } | |
1469 | ||
1470 | static int set_invariant_sys_reg(u64 id, void __user *uaddr) | |
1471 | { | |
1472 | struct sys_reg_params params; | |
1473 | const struct sys_reg_desc *r; | |
1474 | int err; | |
1475 | u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */ | |
1476 | ||
1477 | if (!index_to_params(id, ¶ms)) | |
1478 | return -ENOENT; | |
1479 | r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); | |
1480 | if (!r) | |
1481 | return -ENOENT; | |
1482 | ||
1483 | err = reg_from_user(&val, uaddr, id); | |
1484 | if (err) | |
1485 | return err; | |
1486 | ||
1487 | /* This is what we mean by invariant: you can't change it. */ | |
1488 | if (r->val != val) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static bool is_valid_cache(u32 val) | |
1495 | { | |
1496 | u32 level, ctype; | |
1497 | ||
1498 | if (val >= CSSELR_MAX) | |
18d45766 | 1499 | return false; |
7c8c5e6a MZ |
1500 | |
1501 | /* Bottom bit is Instruction or Data bit. Next 3 bits are level. */ | |
1502 | level = (val >> 1); | |
1503 | ctype = (cache_levels >> (level * 3)) & 7; | |
1504 | ||
1505 | switch (ctype) { | |
1506 | case 0: /* No cache */ | |
1507 | return false; | |
1508 | case 1: /* Instruction cache only */ | |
1509 | return (val & 1); | |
1510 | case 2: /* Data cache only */ | |
1511 | case 4: /* Unified cache */ | |
1512 | return !(val & 1); | |
1513 | case 3: /* Separate instruction and data caches */ | |
1514 | return true; | |
1515 | default: /* Reserved: we can't know instruction or data. */ | |
1516 | return false; | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | static int demux_c15_get(u64 id, void __user *uaddr) | |
1521 | { | |
1522 | u32 val; | |
1523 | u32 __user *uval = uaddr; | |
1524 | ||
1525 | /* Fail if we have unknown bits set. */ | |
1526 | if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK | |
1527 | | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) | |
1528 | return -ENOENT; | |
1529 | ||
1530 | switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { | |
1531 | case KVM_REG_ARM_DEMUX_ID_CCSIDR: | |
1532 | if (KVM_REG_SIZE(id) != 4) | |
1533 | return -ENOENT; | |
1534 | val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) | |
1535 | >> KVM_REG_ARM_DEMUX_VAL_SHIFT; | |
1536 | if (!is_valid_cache(val)) | |
1537 | return -ENOENT; | |
1538 | ||
1539 | return put_user(get_ccsidr(val), uval); | |
1540 | default: | |
1541 | return -ENOENT; | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | static int demux_c15_set(u64 id, void __user *uaddr) | |
1546 | { | |
1547 | u32 val, newval; | |
1548 | u32 __user *uval = uaddr; | |
1549 | ||
1550 | /* Fail if we have unknown bits set. */ | |
1551 | if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK | |
1552 | | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) | |
1553 | return -ENOENT; | |
1554 | ||
1555 | switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { | |
1556 | case KVM_REG_ARM_DEMUX_ID_CCSIDR: | |
1557 | if (KVM_REG_SIZE(id) != 4) | |
1558 | return -ENOENT; | |
1559 | val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) | |
1560 | >> KVM_REG_ARM_DEMUX_VAL_SHIFT; | |
1561 | if (!is_valid_cache(val)) | |
1562 | return -ENOENT; | |
1563 | ||
1564 | if (get_user(newval, uval)) | |
1565 | return -EFAULT; | |
1566 | ||
1567 | /* This is also invariant: you can't change it. */ | |
1568 | if (newval != get_ccsidr(val)) | |
1569 | return -EINVAL; | |
1570 | return 0; | |
1571 | default: | |
1572 | return -ENOENT; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
1577 | { | |
1578 | const struct sys_reg_desc *r; | |
1579 | void __user *uaddr = (void __user *)(unsigned long)reg->addr; | |
1580 | ||
1581 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) | |
1582 | return demux_c15_get(reg->id, uaddr); | |
1583 | ||
1584 | if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) | |
1585 | return -ENOENT; | |
1586 | ||
1587 | r = index_to_sys_reg_desc(vcpu, reg->id); | |
1588 | if (!r) | |
1589 | return get_invariant_sys_reg(reg->id, uaddr); | |
1590 | ||
84e690bf AB |
1591 | if (r->get_user) |
1592 | return (r->get_user)(vcpu, r, reg, uaddr); | |
1593 | ||
7c8c5e6a MZ |
1594 | return reg_to_user(uaddr, &vcpu_sys_reg(vcpu, r->reg), reg->id); |
1595 | } | |
1596 | ||
1597 | int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
1598 | { | |
1599 | const struct sys_reg_desc *r; | |
1600 | void __user *uaddr = (void __user *)(unsigned long)reg->addr; | |
1601 | ||
1602 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) | |
1603 | return demux_c15_set(reg->id, uaddr); | |
1604 | ||
1605 | if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) | |
1606 | return -ENOENT; | |
1607 | ||
1608 | r = index_to_sys_reg_desc(vcpu, reg->id); | |
1609 | if (!r) | |
1610 | return set_invariant_sys_reg(reg->id, uaddr); | |
1611 | ||
84e690bf AB |
1612 | if (r->set_user) |
1613 | return (r->set_user)(vcpu, r, reg, uaddr); | |
1614 | ||
7c8c5e6a MZ |
1615 | return reg_from_user(&vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id); |
1616 | } | |
1617 | ||
1618 | static unsigned int num_demux_regs(void) | |
1619 | { | |
1620 | unsigned int i, count = 0; | |
1621 | ||
1622 | for (i = 0; i < CSSELR_MAX; i++) | |
1623 | if (is_valid_cache(i)) | |
1624 | count++; | |
1625 | ||
1626 | return count; | |
1627 | } | |
1628 | ||
1629 | static int write_demux_regids(u64 __user *uindices) | |
1630 | { | |
efd48cea | 1631 | u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; |
7c8c5e6a MZ |
1632 | unsigned int i; |
1633 | ||
1634 | val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; | |
1635 | for (i = 0; i < CSSELR_MAX; i++) { | |
1636 | if (!is_valid_cache(i)) | |
1637 | continue; | |
1638 | if (put_user(val | i, uindices)) | |
1639 | return -EFAULT; | |
1640 | uindices++; | |
1641 | } | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | static u64 sys_reg_to_index(const struct sys_reg_desc *reg) | |
1646 | { | |
1647 | return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | | |
1648 | KVM_REG_ARM64_SYSREG | | |
1649 | (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | | |
1650 | (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | | |
1651 | (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | | |
1652 | (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | | |
1653 | (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); | |
1654 | } | |
1655 | ||
1656 | static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) | |
1657 | { | |
1658 | if (!*uind) | |
1659 | return true; | |
1660 | ||
1661 | if (put_user(sys_reg_to_index(reg), *uind)) | |
1662 | return false; | |
1663 | ||
1664 | (*uind)++; | |
1665 | return true; | |
1666 | } | |
1667 | ||
1668 | /* Assumed ordered tables, see kvm_sys_reg_table_init. */ | |
1669 | static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) | |
1670 | { | |
1671 | const struct sys_reg_desc *i1, *i2, *end1, *end2; | |
1672 | unsigned int total = 0; | |
1673 | size_t num; | |
1674 | ||
1675 | /* We check for duplicates here, to allow arch-specific overrides. */ | |
62a89c44 | 1676 | i1 = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
1677 | end1 = i1 + num; |
1678 | i2 = sys_reg_descs; | |
1679 | end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); | |
1680 | ||
1681 | BUG_ON(i1 == end1 || i2 == end2); | |
1682 | ||
1683 | /* Walk carefully, as both tables may refer to the same register. */ | |
1684 | while (i1 || i2) { | |
1685 | int cmp = cmp_sys_reg(i1, i2); | |
1686 | /* target-specific overrides generic entry. */ | |
1687 | if (cmp <= 0) { | |
1688 | /* Ignore registers we trap but don't save. */ | |
1689 | if (i1->reg) { | |
1690 | if (!copy_reg_to_user(i1, &uind)) | |
1691 | return -EFAULT; | |
1692 | total++; | |
1693 | } | |
1694 | } else { | |
1695 | /* Ignore registers we trap but don't save. */ | |
1696 | if (i2->reg) { | |
1697 | if (!copy_reg_to_user(i2, &uind)) | |
1698 | return -EFAULT; | |
1699 | total++; | |
1700 | } | |
1701 | } | |
1702 | ||
1703 | if (cmp <= 0 && ++i1 == end1) | |
1704 | i1 = NULL; | |
1705 | if (cmp >= 0 && ++i2 == end2) | |
1706 | i2 = NULL; | |
1707 | } | |
1708 | return total; | |
1709 | } | |
1710 | ||
1711 | unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) | |
1712 | { | |
1713 | return ARRAY_SIZE(invariant_sys_regs) | |
1714 | + num_demux_regs() | |
1715 | + walk_sys_regs(vcpu, (u64 __user *)NULL); | |
1716 | } | |
1717 | ||
1718 | int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
1719 | { | |
1720 | unsigned int i; | |
1721 | int err; | |
1722 | ||
1723 | /* Then give them all the invariant registers' indices. */ | |
1724 | for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { | |
1725 | if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) | |
1726 | return -EFAULT; | |
1727 | uindices++; | |
1728 | } | |
1729 | ||
1730 | err = walk_sys_regs(vcpu, uindices); | |
1731 | if (err < 0) | |
1732 | return err; | |
1733 | uindices += err; | |
1734 | ||
1735 | return write_demux_regids(uindices); | |
1736 | } | |
1737 | ||
e6a95517 MZ |
1738 | static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n) |
1739 | { | |
1740 | unsigned int i; | |
1741 | ||
1742 | for (i = 1; i < n; i++) { | |
1743 | if (cmp_sys_reg(&table[i-1], &table[i]) >= 0) { | |
1744 | kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1); | |
1745 | return 1; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | return 0; | |
1750 | } | |
1751 | ||
7c8c5e6a MZ |
1752 | void kvm_sys_reg_table_init(void) |
1753 | { | |
1754 | unsigned int i; | |
1755 | struct sys_reg_desc clidr; | |
1756 | ||
1757 | /* Make sure tables are unique and in order. */ | |
e6a95517 MZ |
1758 | BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs))); |
1759 | BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs))); | |
1760 | BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs))); | |
1761 | BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs))); | |
1762 | BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs))); | |
1763 | BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs))); | |
7c8c5e6a MZ |
1764 | |
1765 | /* We abuse the reset function to overwrite the table itself. */ | |
1766 | for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) | |
1767 | invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); | |
1768 | ||
1769 | /* | |
1770 | * CLIDR format is awkward, so clean it up. See ARM B4.1.20: | |
1771 | * | |
1772 | * If software reads the Cache Type fields from Ctype1 | |
1773 | * upwards, once it has seen a value of 0b000, no caches | |
1774 | * exist at further-out levels of the hierarchy. So, for | |
1775 | * example, if Ctype3 is the first Cache Type field with a | |
1776 | * value of 0b000, the values of Ctype4 to Ctype7 must be | |
1777 | * ignored. | |
1778 | */ | |
1779 | get_clidr_el1(NULL, &clidr); /* Ugly... */ | |
1780 | cache_levels = clidr.val; | |
1781 | for (i = 0; i < 7; i++) | |
1782 | if (((cache_levels >> (i*3)) & 7) == 0) | |
1783 | break; | |
1784 | /* Clear all higher bits. */ | |
1785 | cache_levels &= (1 << (i*3))-1; | |
1786 | } | |
1787 | ||
1788 | /** | |
1789 | * kvm_reset_sys_regs - sets system registers to reset value | |
1790 | * @vcpu: The VCPU pointer | |
1791 | * | |
1792 | * This function finds the right table above and sets the registers on the | |
1793 | * virtual CPU struct to their architecturally defined reset values. | |
1794 | */ | |
1795 | void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) | |
1796 | { | |
1797 | size_t num; | |
1798 | const struct sys_reg_desc *table; | |
1799 | ||
1800 | /* Catch someone adding a register without putting in reset entry. */ | |
1801 | memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs)); | |
1802 | ||
1803 | /* Generic chip reset first (so target could override). */ | |
1804 | reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); | |
1805 | ||
62a89c44 | 1806 | table = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
1807 | reset_sys_reg_descs(vcpu, table, num); |
1808 | ||
1809 | for (num = 1; num < NR_SYS_REGS; num++) | |
1810 | if (vcpu_sys_reg(vcpu, num) == 0x4242424242424242) | |
1811 | panic("Didn't reset vcpu_sys_reg(%zi)", num); | |
1812 | } |