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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 | ||
23 | #include <linux/mm.h> | |
24 | #include <linux/kvm_host.h> | |
25 | #include <linux/uaccess.h> | |
26 | #include <asm/kvm_arm.h> | |
27 | #include <asm/kvm_host.h> | |
28 | #include <asm/kvm_emulate.h> | |
29 | #include <asm/kvm_coproc.h> | |
9d218a1f | 30 | #include <asm/kvm_mmu.h> |
7c8c5e6a MZ |
31 | #include <asm/cacheflush.h> |
32 | #include <asm/cputype.h> | |
0c557ed4 | 33 | #include <asm/debug-monitors.h> |
7c8c5e6a MZ |
34 | #include <trace/events/kvm.h> |
35 | ||
36 | #include "sys_regs.h" | |
37 | ||
38 | /* | |
39 | * All of this file is extremly similar to the ARM coproc.c, but the | |
40 | * types are different. My gut feeling is that it should be pretty | |
41 | * easy to merge, but that would be an ABI breakage -- again. VFP | |
42 | * would also need to be abstracted. | |
62a89c44 MZ |
43 | * |
44 | * For AArch32, we only take care of what is being trapped. Anything | |
45 | * that has to do with init and userspace access has to go via the | |
46 | * 64bit interface. | |
7c8c5e6a MZ |
47 | */ |
48 | ||
49 | /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */ | |
50 | static u32 cache_levels; | |
51 | ||
52 | /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ | |
53 | #define CSSELR_MAX 12 | |
54 | ||
55 | /* Which cache CCSIDR represents depends on CSSELR value. */ | |
56 | static u32 get_ccsidr(u32 csselr) | |
57 | { | |
58 | u32 ccsidr; | |
59 | ||
60 | /* Make sure noone else changes CSSELR during this! */ | |
61 | local_irq_disable(); | |
62 | /* Put value into CSSELR */ | |
63 | asm volatile("msr csselr_el1, %x0" : : "r" (csselr)); | |
64 | isb(); | |
65 | /* Read result out of CCSIDR */ | |
66 | asm volatile("mrs %0, ccsidr_el1" : "=r" (ccsidr)); | |
67 | local_irq_enable(); | |
68 | ||
69 | return ccsidr; | |
70 | } | |
71 | ||
72 | static void do_dc_cisw(u32 val) | |
73 | { | |
74 | asm volatile("dc cisw, %x0" : : "r" (val)); | |
98f7685e | 75 | dsb(ish); |
7c8c5e6a MZ |
76 | } |
77 | ||
78 | static void do_dc_csw(u32 val) | |
79 | { | |
80 | asm volatile("dc csw, %x0" : : "r" (val)); | |
98f7685e | 81 | dsb(ish); |
7c8c5e6a MZ |
82 | } |
83 | ||
84 | /* See note at ARM ARM B1.14.4 */ | |
85 | static bool access_dcsw(struct kvm_vcpu *vcpu, | |
86 | const struct sys_reg_params *p, | |
87 | const struct sys_reg_desc *r) | |
88 | { | |
89 | unsigned long val; | |
90 | int cpu; | |
91 | ||
92 | if (!p->is_write) | |
93 | return read_from_write_only(vcpu, p); | |
94 | ||
95 | cpu = get_cpu(); | |
96 | ||
97 | cpumask_setall(&vcpu->arch.require_dcache_flush); | |
98 | cpumask_clear_cpu(cpu, &vcpu->arch.require_dcache_flush); | |
99 | ||
100 | /* If we were already preempted, take the long way around */ | |
101 | if (cpu != vcpu->arch.last_pcpu) { | |
102 | flush_cache_all(); | |
103 | goto done; | |
104 | } | |
105 | ||
106 | val = *vcpu_reg(vcpu, p->Rt); | |
107 | ||
108 | switch (p->CRm) { | |
109 | case 6: /* Upgrade DCISW to DCCISW, as per HCR.SWIO */ | |
110 | case 14: /* DCCISW */ | |
111 | do_dc_cisw(val); | |
112 | break; | |
113 | ||
114 | case 10: /* DCCSW */ | |
115 | do_dc_csw(val); | |
116 | break; | |
117 | } | |
118 | ||
119 | done: | |
120 | put_cpu(); | |
121 | ||
122 | return true; | |
123 | } | |
124 | ||
4d44923b MZ |
125 | /* |
126 | * Generic accessor for VM registers. Only called as long as HCR_TVM | |
127 | * is set. | |
128 | */ | |
129 | static bool access_vm_reg(struct kvm_vcpu *vcpu, | |
130 | const struct sys_reg_params *p, | |
131 | const struct sys_reg_desc *r) | |
132 | { | |
133 | unsigned long val; | |
134 | ||
135 | BUG_ON(!p->is_write); | |
136 | ||
137 | val = *vcpu_reg(vcpu, p->Rt); | |
f0a3eaff | 138 | if (!p->is_aarch32 || !p->is_32bit) |
4d44923b | 139 | vcpu_sys_reg(vcpu, r->reg) = val; |
f0a3eaff VK |
140 | else |
141 | vcpu_cp15_64_low(vcpu, r->reg) = val & 0xffffffffUL; | |
142 | ||
4d44923b MZ |
143 | return true; |
144 | } | |
145 | ||
146 | /* | |
147 | * SCTLR_EL1 accessor. Only called as long as HCR_TVM is set. If the | |
148 | * guest enables the MMU, we stop trapping the VM sys_regs and leave | |
149 | * it in complete control of the caches. | |
150 | */ | |
151 | static bool access_sctlr(struct kvm_vcpu *vcpu, | |
152 | const struct sys_reg_params *p, | |
153 | const struct sys_reg_desc *r) | |
154 | { | |
155 | access_vm_reg(vcpu, p, r); | |
156 | ||
9d218a1f | 157 | if (vcpu_has_cache_enabled(vcpu)) { /* MMU+Caches enabled? */ |
4d44923b | 158 | vcpu->arch.hcr_el2 &= ~HCR_TVM; |
9d218a1f MZ |
159 | stage2_flush_vm(vcpu->kvm); |
160 | } | |
4d44923b MZ |
161 | |
162 | return true; | |
163 | } | |
164 | ||
7609c125 MZ |
165 | static bool trap_raz_wi(struct kvm_vcpu *vcpu, |
166 | const struct sys_reg_params *p, | |
167 | const struct sys_reg_desc *r) | |
7c8c5e6a MZ |
168 | { |
169 | if (p->is_write) | |
170 | return ignore_write(vcpu, p); | |
171 | else | |
172 | return read_zero(vcpu, p); | |
173 | } | |
174 | ||
0c557ed4 MZ |
175 | static bool trap_oslsr_el1(struct kvm_vcpu *vcpu, |
176 | const struct sys_reg_params *p, | |
177 | const struct sys_reg_desc *r) | |
178 | { | |
179 | if (p->is_write) { | |
180 | return ignore_write(vcpu, p); | |
181 | } else { | |
182 | *vcpu_reg(vcpu, p->Rt) = (1 << 3); | |
183 | return true; | |
184 | } | |
185 | } | |
186 | ||
187 | static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu, | |
188 | const struct sys_reg_params *p, | |
189 | const struct sys_reg_desc *r) | |
190 | { | |
191 | if (p->is_write) { | |
192 | return ignore_write(vcpu, p); | |
193 | } else { | |
194 | u32 val; | |
195 | asm volatile("mrs %0, dbgauthstatus_el1" : "=r" (val)); | |
196 | *vcpu_reg(vcpu, p->Rt) = val; | |
197 | return true; | |
198 | } | |
199 | } | |
200 | ||
201 | /* | |
202 | * We want to avoid world-switching all the DBG registers all the | |
203 | * time: | |
204 | * | |
205 | * - If we've touched any debug register, it is likely that we're | |
206 | * going to touch more of them. It then makes sense to disable the | |
207 | * traps and start doing the save/restore dance | |
208 | * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is | |
209 | * then mandatory to save/restore the registers, as the guest | |
210 | * depends on them. | |
211 | * | |
212 | * For this, we use a DIRTY bit, indicating the guest has modified the | |
213 | * debug registers, used as follow: | |
214 | * | |
215 | * On guest entry: | |
216 | * - If the dirty bit is set (because we're coming back from trapping), | |
217 | * disable the traps, save host registers, restore guest registers. | |
218 | * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), | |
219 | * set the dirty bit, disable the traps, save host registers, | |
220 | * restore guest registers. | |
221 | * - Otherwise, enable the traps | |
222 | * | |
223 | * On guest exit: | |
224 | * - If the dirty bit is set, save guest registers, restore host | |
225 | * registers and clear the dirty bit. This ensure that the host can | |
226 | * now use the debug registers. | |
227 | */ | |
228 | static bool trap_debug_regs(struct kvm_vcpu *vcpu, | |
229 | const struct sys_reg_params *p, | |
230 | const struct sys_reg_desc *r) | |
231 | { | |
232 | if (p->is_write) { | |
233 | vcpu_sys_reg(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt); | |
234 | vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; | |
235 | } else { | |
236 | *vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, r->reg); | |
237 | } | |
238 | ||
239 | return true; | |
240 | } | |
241 | ||
7c8c5e6a MZ |
242 | static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) |
243 | { | |
244 | u64 amair; | |
245 | ||
246 | asm volatile("mrs %0, amair_el1\n" : "=r" (amair)); | |
247 | vcpu_sys_reg(vcpu, AMAIR_EL1) = amair; | |
248 | } | |
249 | ||
250 | static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) | |
251 | { | |
252 | /* | |
253 | * Simply map the vcpu_id into the Aff0 field of the MPIDR. | |
254 | */ | |
255 | vcpu_sys_reg(vcpu, MPIDR_EL1) = (1UL << 31) | (vcpu->vcpu_id & 0xff); | |
256 | } | |
257 | ||
0c557ed4 MZ |
258 | /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ |
259 | #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ | |
260 | /* DBGBVRn_EL1 */ \ | |
261 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b100), \ | |
262 | trap_debug_regs, reset_val, (DBGBVR0_EL1 + (n)), 0 }, \ | |
263 | /* DBGBCRn_EL1 */ \ | |
264 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b101), \ | |
265 | trap_debug_regs, reset_val, (DBGBCR0_EL1 + (n)), 0 }, \ | |
266 | /* DBGWVRn_EL1 */ \ | |
267 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b110), \ | |
268 | trap_debug_regs, reset_val, (DBGWVR0_EL1 + (n)), 0 }, \ | |
269 | /* DBGWCRn_EL1 */ \ | |
270 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b111), \ | |
271 | trap_debug_regs, reset_val, (DBGWCR0_EL1 + (n)), 0 } | |
272 | ||
7c8c5e6a MZ |
273 | /* |
274 | * Architected system registers. | |
275 | * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 | |
7609c125 MZ |
276 | * |
277 | * We could trap ID_DFR0 and tell the guest we don't support performance | |
278 | * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was | |
279 | * NAKed, so it will read the PMCR anyway. | |
280 | * | |
281 | * Therefore we tell the guest we have 0 counters. Unfortunately, we | |
282 | * must always support PMCCNTR (the cycle counter): we just RAZ/WI for | |
283 | * all PM registers, which doesn't crash the guest kernel at least. | |
284 | * | |
0c557ed4 MZ |
285 | * Debug handling: We do trap most, if not all debug related system |
286 | * registers. The implementation is good enough to ensure that a guest | |
287 | * can use these with minimal performance degradation. The drawback is | |
288 | * that we don't implement any of the external debug, none of the | |
289 | * OSlock protocol. This should be revisited if we ever encounter a | |
290 | * more demanding guest... | |
7c8c5e6a MZ |
291 | */ |
292 | static const struct sys_reg_desc sys_reg_descs[] = { | |
293 | /* DC ISW */ | |
294 | { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b0110), Op2(0b010), | |
295 | access_dcsw }, | |
296 | /* DC CSW */ | |
297 | { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1010), Op2(0b010), | |
298 | access_dcsw }, | |
299 | /* DC CISW */ | |
300 | { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b010), | |
301 | access_dcsw }, | |
302 | ||
0c557ed4 MZ |
303 | DBG_BCR_BVR_WCR_WVR_EL1(0), |
304 | DBG_BCR_BVR_WCR_WVR_EL1(1), | |
305 | /* MDCCINT_EL1 */ | |
306 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), | |
307 | trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, | |
308 | /* MDSCR_EL1 */ | |
309 | { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), | |
310 | trap_debug_regs, reset_val, MDSCR_EL1, 0 }, | |
311 | DBG_BCR_BVR_WCR_WVR_EL1(2), | |
312 | DBG_BCR_BVR_WCR_WVR_EL1(3), | |
313 | DBG_BCR_BVR_WCR_WVR_EL1(4), | |
314 | DBG_BCR_BVR_WCR_WVR_EL1(5), | |
315 | DBG_BCR_BVR_WCR_WVR_EL1(6), | |
316 | DBG_BCR_BVR_WCR_WVR_EL1(7), | |
317 | DBG_BCR_BVR_WCR_WVR_EL1(8), | |
318 | DBG_BCR_BVR_WCR_WVR_EL1(9), | |
319 | DBG_BCR_BVR_WCR_WVR_EL1(10), | |
320 | DBG_BCR_BVR_WCR_WVR_EL1(11), | |
321 | DBG_BCR_BVR_WCR_WVR_EL1(12), | |
322 | DBG_BCR_BVR_WCR_WVR_EL1(13), | |
323 | DBG_BCR_BVR_WCR_WVR_EL1(14), | |
324 | DBG_BCR_BVR_WCR_WVR_EL1(15), | |
325 | ||
326 | /* MDRAR_EL1 */ | |
327 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), | |
328 | trap_raz_wi }, | |
329 | /* OSLAR_EL1 */ | |
330 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b100), | |
331 | trap_raz_wi }, | |
332 | /* OSLSR_EL1 */ | |
333 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0001), Op2(0b100), | |
334 | trap_oslsr_el1 }, | |
335 | /* OSDLR_EL1 */ | |
336 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0011), Op2(0b100), | |
337 | trap_raz_wi }, | |
338 | /* DBGPRCR_EL1 */ | |
339 | { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0100), Op2(0b100), | |
340 | trap_raz_wi }, | |
341 | /* DBGCLAIMSET_EL1 */ | |
342 | { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1000), Op2(0b110), | |
343 | trap_raz_wi }, | |
344 | /* DBGCLAIMCLR_EL1 */ | |
345 | { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1001), Op2(0b110), | |
346 | trap_raz_wi }, | |
347 | /* DBGAUTHSTATUS_EL1 */ | |
348 | { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b110), | |
349 | trap_dbgauthstatus_el1 }, | |
350 | ||
62a89c44 MZ |
351 | /* TEECR32_EL1 */ |
352 | { Op0(0b10), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000), | |
353 | NULL, reset_val, TEECR32_EL1, 0 }, | |
354 | /* TEEHBR32_EL1 */ | |
355 | { Op0(0b10), Op1(0b010), CRn(0b0001), CRm(0b0000), Op2(0b000), | |
356 | NULL, reset_val, TEEHBR32_EL1, 0 }, | |
0c557ed4 MZ |
357 | |
358 | /* MDCCSR_EL1 */ | |
359 | { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0001), Op2(0b000), | |
360 | trap_raz_wi }, | |
361 | /* DBGDTR_EL0 */ | |
362 | { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0100), Op2(0b000), | |
363 | trap_raz_wi }, | |
364 | /* DBGDTR[TR]X_EL0 */ | |
365 | { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0101), Op2(0b000), | |
366 | trap_raz_wi }, | |
367 | ||
62a89c44 MZ |
368 | /* DBGVCR32_EL2 */ |
369 | { Op0(0b10), Op1(0b100), CRn(0b0000), CRm(0b0111), Op2(0b000), | |
370 | NULL, reset_val, DBGVCR32_EL2, 0 }, | |
371 | ||
7c8c5e6a MZ |
372 | /* MPIDR_EL1 */ |
373 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b101), | |
374 | NULL, reset_mpidr, MPIDR_EL1 }, | |
375 | /* SCTLR_EL1 */ | |
376 | { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), | |
4d44923b | 377 | access_sctlr, reset_val, SCTLR_EL1, 0x00C50078 }, |
7c8c5e6a MZ |
378 | /* CPACR_EL1 */ |
379 | { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b010), | |
380 | NULL, reset_val, CPACR_EL1, 0 }, | |
381 | /* TTBR0_EL1 */ | |
382 | { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b000), | |
4d44923b | 383 | access_vm_reg, reset_unknown, TTBR0_EL1 }, |
7c8c5e6a MZ |
384 | /* TTBR1_EL1 */ |
385 | { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b001), | |
4d44923b | 386 | access_vm_reg, reset_unknown, TTBR1_EL1 }, |
7c8c5e6a MZ |
387 | /* TCR_EL1 */ |
388 | { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b010), | |
4d44923b | 389 | access_vm_reg, reset_val, TCR_EL1, 0 }, |
7c8c5e6a MZ |
390 | |
391 | /* AFSR0_EL1 */ | |
392 | { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b000), | |
4d44923b | 393 | access_vm_reg, reset_unknown, AFSR0_EL1 }, |
7c8c5e6a MZ |
394 | /* AFSR1_EL1 */ |
395 | { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b001), | |
4d44923b | 396 | access_vm_reg, reset_unknown, AFSR1_EL1 }, |
7c8c5e6a MZ |
397 | /* ESR_EL1 */ |
398 | { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0010), Op2(0b000), | |
4d44923b | 399 | access_vm_reg, reset_unknown, ESR_EL1 }, |
7c8c5e6a MZ |
400 | /* FAR_EL1 */ |
401 | { Op0(0b11), Op1(0b000), CRn(0b0110), CRm(0b0000), Op2(0b000), | |
4d44923b | 402 | access_vm_reg, reset_unknown, FAR_EL1 }, |
1bbd8054 MZ |
403 | /* PAR_EL1 */ |
404 | { Op0(0b11), Op1(0b000), CRn(0b0111), CRm(0b0100), Op2(0b000), | |
405 | NULL, reset_unknown, PAR_EL1 }, | |
7c8c5e6a MZ |
406 | |
407 | /* PMINTENSET_EL1 */ | |
408 | { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b001), | |
7609c125 | 409 | trap_raz_wi }, |
7c8c5e6a MZ |
410 | /* PMINTENCLR_EL1 */ |
411 | { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b010), | |
7609c125 | 412 | trap_raz_wi }, |
7c8c5e6a MZ |
413 | |
414 | /* MAIR_EL1 */ | |
415 | { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0010), Op2(0b000), | |
4d44923b | 416 | access_vm_reg, reset_unknown, MAIR_EL1 }, |
7c8c5e6a MZ |
417 | /* AMAIR_EL1 */ |
418 | { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0011), Op2(0b000), | |
4d44923b | 419 | access_vm_reg, reset_amair_el1, AMAIR_EL1 }, |
7c8c5e6a MZ |
420 | |
421 | /* VBAR_EL1 */ | |
422 | { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b0000), Op2(0b000), | |
423 | NULL, reset_val, VBAR_EL1, 0 }, | |
424 | /* CONTEXTIDR_EL1 */ | |
425 | { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b001), | |
4d44923b | 426 | access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, |
7c8c5e6a MZ |
427 | /* TPIDR_EL1 */ |
428 | { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b100), | |
429 | NULL, reset_unknown, TPIDR_EL1 }, | |
430 | ||
431 | /* CNTKCTL_EL1 */ | |
432 | { Op0(0b11), Op1(0b000), CRn(0b1110), CRm(0b0001), Op2(0b000), | |
433 | NULL, reset_val, CNTKCTL_EL1, 0}, | |
434 | ||
435 | /* CSSELR_EL1 */ | |
436 | { Op0(0b11), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000), | |
437 | NULL, reset_unknown, CSSELR_EL1 }, | |
438 | ||
439 | /* PMCR_EL0 */ | |
440 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b000), | |
7609c125 | 441 | trap_raz_wi }, |
7c8c5e6a MZ |
442 | /* PMCNTENSET_EL0 */ |
443 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b001), | |
7609c125 | 444 | trap_raz_wi }, |
7c8c5e6a MZ |
445 | /* PMCNTENCLR_EL0 */ |
446 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b010), | |
7609c125 | 447 | trap_raz_wi }, |
7c8c5e6a MZ |
448 | /* PMOVSCLR_EL0 */ |
449 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b011), | |
7609c125 | 450 | trap_raz_wi }, |
7c8c5e6a MZ |
451 | /* PMSWINC_EL0 */ |
452 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b100), | |
7609c125 | 453 | trap_raz_wi }, |
7c8c5e6a MZ |
454 | /* PMSELR_EL0 */ |
455 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101), | |
7609c125 | 456 | trap_raz_wi }, |
7c8c5e6a MZ |
457 | /* PMCEID0_EL0 */ |
458 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110), | |
7609c125 | 459 | trap_raz_wi }, |
7c8c5e6a MZ |
460 | /* PMCEID1_EL0 */ |
461 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111), | |
7609c125 | 462 | trap_raz_wi }, |
7c8c5e6a MZ |
463 | /* PMCCNTR_EL0 */ |
464 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000), | |
7609c125 | 465 | trap_raz_wi }, |
7c8c5e6a MZ |
466 | /* PMXEVTYPER_EL0 */ |
467 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001), | |
7609c125 | 468 | trap_raz_wi }, |
7c8c5e6a MZ |
469 | /* PMXEVCNTR_EL0 */ |
470 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b010), | |
7609c125 | 471 | trap_raz_wi }, |
7c8c5e6a MZ |
472 | /* PMUSERENR_EL0 */ |
473 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b000), | |
7609c125 | 474 | trap_raz_wi }, |
7c8c5e6a MZ |
475 | /* PMOVSSET_EL0 */ |
476 | { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b011), | |
7609c125 | 477 | trap_raz_wi }, |
7c8c5e6a MZ |
478 | |
479 | /* TPIDR_EL0 */ | |
480 | { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b010), | |
481 | NULL, reset_unknown, TPIDR_EL0 }, | |
482 | /* TPIDRRO_EL0 */ | |
483 | { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b011), | |
484 | NULL, reset_unknown, TPIDRRO_EL0 }, | |
62a89c44 MZ |
485 | |
486 | /* DACR32_EL2 */ | |
487 | { Op0(0b11), Op1(0b100), CRn(0b0011), CRm(0b0000), Op2(0b000), | |
488 | NULL, reset_unknown, DACR32_EL2 }, | |
489 | /* IFSR32_EL2 */ | |
490 | { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0000), Op2(0b001), | |
491 | NULL, reset_unknown, IFSR32_EL2 }, | |
492 | /* FPEXC32_EL2 */ | |
493 | { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0011), Op2(0b000), | |
494 | NULL, reset_val, FPEXC32_EL2, 0x70 }, | |
495 | }; | |
496 | ||
72564016 MZ |
497 | /* Trapped cp14 registers */ |
498 | static const struct sys_reg_desc cp14_regs[] = { | |
499 | }; | |
500 | ||
a9866ba0 MZ |
501 | /* Trapped cp14 64bit registers */ |
502 | static const struct sys_reg_desc cp14_64_regs[] = { | |
503 | }; | |
504 | ||
4d44923b MZ |
505 | /* |
506 | * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding, | |
507 | * depending on the way they are accessed (as a 32bit or a 64bit | |
508 | * register). | |
509 | */ | |
62a89c44 | 510 | static const struct sys_reg_desc cp15_regs[] = { |
4d44923b MZ |
511 | { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_sctlr, NULL, c1_SCTLR }, |
512 | { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, | |
513 | { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 }, | |
514 | { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR }, | |
515 | { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR }, | |
516 | { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR }, | |
517 | { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR }, | |
518 | { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, c5_ADFSR }, | |
519 | { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, c5_AIFSR }, | |
520 | { Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, c6_DFAR }, | |
521 | { Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, c6_IFAR }, | |
522 | ||
62a89c44 MZ |
523 | /* |
524 | * DC{C,I,CI}SW operations: | |
525 | */ | |
526 | { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, | |
527 | { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, | |
528 | { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, | |
4d44923b | 529 | |
7609c125 MZ |
530 | /* PMU */ |
531 | { Op1( 0), CRn( 9), CRm(12), Op2( 0), trap_raz_wi }, | |
532 | { Op1( 0), CRn( 9), CRm(12), Op2( 1), trap_raz_wi }, | |
533 | { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi }, | |
534 | { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi }, | |
535 | { Op1( 0), CRn( 9), CRm(12), Op2( 5), trap_raz_wi }, | |
536 | { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi }, | |
537 | { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi }, | |
538 | { Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi }, | |
539 | { Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi }, | |
540 | { Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi }, | |
541 | { Op1( 0), CRn( 9), CRm(14), Op2( 0), trap_raz_wi }, | |
542 | { Op1( 0), CRn( 9), CRm(14), Op2( 1), trap_raz_wi }, | |
543 | { Op1( 0), CRn( 9), CRm(14), Op2( 2), trap_raz_wi }, | |
4d44923b MZ |
544 | |
545 | { Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, c10_PRRR }, | |
546 | { Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, c10_NMRR }, | |
547 | { Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, c10_AMAIR0 }, | |
548 | { Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, c10_AMAIR1 }, | |
549 | { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID }, | |
550 | ||
a9866ba0 MZ |
551 | }; |
552 | ||
553 | static const struct sys_reg_desc cp15_64_regs[] = { | |
554 | { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, | |
4d44923b | 555 | { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 }, |
7c8c5e6a MZ |
556 | }; |
557 | ||
558 | /* Target specific emulation tables */ | |
559 | static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS]; | |
560 | ||
561 | void kvm_register_target_sys_reg_table(unsigned int target, | |
562 | struct kvm_sys_reg_target_table *table) | |
563 | { | |
564 | target_tables[target] = table; | |
565 | } | |
566 | ||
567 | /* Get specific register table for this target. */ | |
62a89c44 MZ |
568 | static const struct sys_reg_desc *get_target_table(unsigned target, |
569 | bool mode_is_64, | |
570 | size_t *num) | |
7c8c5e6a MZ |
571 | { |
572 | struct kvm_sys_reg_target_table *table; | |
573 | ||
574 | table = target_tables[target]; | |
62a89c44 MZ |
575 | if (mode_is_64) { |
576 | *num = table->table64.num; | |
577 | return table->table64.table; | |
578 | } else { | |
579 | *num = table->table32.num; | |
580 | return table->table32.table; | |
581 | } | |
7c8c5e6a MZ |
582 | } |
583 | ||
584 | static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params, | |
585 | const struct sys_reg_desc table[], | |
586 | unsigned int num) | |
587 | { | |
588 | unsigned int i; | |
589 | ||
590 | for (i = 0; i < num; i++) { | |
591 | const struct sys_reg_desc *r = &table[i]; | |
592 | ||
593 | if (params->Op0 != r->Op0) | |
594 | continue; | |
595 | if (params->Op1 != r->Op1) | |
596 | continue; | |
597 | if (params->CRn != r->CRn) | |
598 | continue; | |
599 | if (params->CRm != r->CRm) | |
600 | continue; | |
601 | if (params->Op2 != r->Op2) | |
602 | continue; | |
603 | ||
604 | return r; | |
605 | } | |
606 | return NULL; | |
607 | } | |
608 | ||
62a89c44 MZ |
609 | int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run) |
610 | { | |
611 | kvm_inject_undefined(vcpu); | |
612 | return 1; | |
613 | } | |
614 | ||
72564016 MZ |
615 | /* |
616 | * emulate_cp -- tries to match a sys_reg access in a handling table, and | |
617 | * call the corresponding trap handler. | |
618 | * | |
619 | * @params: pointer to the descriptor of the access | |
620 | * @table: array of trap descriptors | |
621 | * @num: size of the trap descriptor array | |
622 | * | |
623 | * Return 0 if the access has been handled, and -1 if not. | |
624 | */ | |
625 | static int emulate_cp(struct kvm_vcpu *vcpu, | |
626 | const struct sys_reg_params *params, | |
627 | const struct sys_reg_desc *table, | |
628 | size_t num) | |
62a89c44 | 629 | { |
72564016 | 630 | const struct sys_reg_desc *r; |
62a89c44 | 631 | |
72564016 MZ |
632 | if (!table) |
633 | return -1; /* Not handled */ | |
62a89c44 | 634 | |
62a89c44 | 635 | r = find_reg(params, table, num); |
62a89c44 | 636 | |
72564016 | 637 | if (r) { |
62a89c44 MZ |
638 | /* |
639 | * Not having an accessor means that we have | |
640 | * configured a trap that we don't know how to | |
641 | * handle. This certainly qualifies as a gross bug | |
642 | * that should be fixed right away. | |
643 | */ | |
644 | BUG_ON(!r->access); | |
645 | ||
646 | if (likely(r->access(vcpu, params, r))) { | |
647 | /* Skip instruction, since it was emulated */ | |
648 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
62a89c44 | 649 | } |
72564016 MZ |
650 | |
651 | /* Handled */ | |
652 | return 0; | |
653 | } | |
654 | ||
655 | /* Not handled */ | |
656 | return -1; | |
657 | } | |
658 | ||
659 | static void unhandled_cp_access(struct kvm_vcpu *vcpu, | |
660 | struct sys_reg_params *params) | |
661 | { | |
662 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | |
663 | int cp; | |
664 | ||
665 | switch(hsr_ec) { | |
666 | case ESR_EL2_EC_CP15_32: | |
667 | case ESR_EL2_EC_CP15_64: | |
668 | cp = 15; | |
669 | break; | |
670 | case ESR_EL2_EC_CP14_MR: | |
671 | case ESR_EL2_EC_CP14_64: | |
672 | cp = 14; | |
673 | break; | |
674 | default: | |
675 | WARN_ON((cp = -1)); | |
62a89c44 MZ |
676 | } |
677 | ||
72564016 MZ |
678 | kvm_err("Unsupported guest CP%d access at: %08lx\n", |
679 | cp, *vcpu_pc(vcpu)); | |
62a89c44 MZ |
680 | print_sys_reg_instr(params); |
681 | kvm_inject_undefined(vcpu); | |
682 | } | |
683 | ||
684 | /** | |
72564016 | 685 | * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP15 access |
62a89c44 MZ |
686 | * @vcpu: The VCPU pointer |
687 | * @run: The kvm_run struct | |
688 | */ | |
72564016 MZ |
689 | static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, |
690 | const struct sys_reg_desc *global, | |
691 | size_t nr_global, | |
692 | const struct sys_reg_desc *target_specific, | |
693 | size_t nr_specific) | |
62a89c44 MZ |
694 | { |
695 | struct sys_reg_params params; | |
696 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
697 | int Rt2 = (hsr >> 10) & 0xf; | |
698 | ||
2072d29c MZ |
699 | params.is_aarch32 = true; |
700 | params.is_32bit = false; | |
62a89c44 MZ |
701 | params.CRm = (hsr >> 1) & 0xf; |
702 | params.Rt = (hsr >> 5) & 0xf; | |
703 | params.is_write = ((hsr & 1) == 0); | |
704 | ||
705 | params.Op0 = 0; | |
706 | params.Op1 = (hsr >> 16) & 0xf; | |
707 | params.Op2 = 0; | |
708 | params.CRn = 0; | |
709 | ||
710 | /* | |
711 | * Massive hack here. Store Rt2 in the top 32bits so we only | |
712 | * have one register to deal with. As we use the same trap | |
713 | * backends between AArch32 and AArch64, we get away with it. | |
714 | */ | |
715 | if (params.is_write) { | |
716 | u64 val = *vcpu_reg(vcpu, params.Rt); | |
717 | val &= 0xffffffff; | |
718 | val |= *vcpu_reg(vcpu, Rt2) << 32; | |
719 | *vcpu_reg(vcpu, params.Rt) = val; | |
720 | } | |
721 | ||
72564016 MZ |
722 | if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific)) |
723 | goto out; | |
724 | if (!emulate_cp(vcpu, ¶ms, global, nr_global)) | |
725 | goto out; | |
726 | ||
727 | unhandled_cp_access(vcpu, ¶ms); | |
62a89c44 | 728 | |
72564016 | 729 | out: |
62a89c44 MZ |
730 | /* Do the opposite hack for the read side */ |
731 | if (!params.is_write) { | |
732 | u64 val = *vcpu_reg(vcpu, params.Rt); | |
733 | val >>= 32; | |
734 | *vcpu_reg(vcpu, Rt2) = val; | |
735 | } | |
736 | ||
737 | return 1; | |
738 | } | |
739 | ||
740 | /** | |
741 | * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access | |
742 | * @vcpu: The VCPU pointer | |
743 | * @run: The kvm_run struct | |
744 | */ | |
72564016 MZ |
745 | static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, |
746 | const struct sys_reg_desc *global, | |
747 | size_t nr_global, | |
748 | const struct sys_reg_desc *target_specific, | |
749 | size_t nr_specific) | |
62a89c44 MZ |
750 | { |
751 | struct sys_reg_params params; | |
752 | u32 hsr = kvm_vcpu_get_hsr(vcpu); | |
753 | ||
2072d29c MZ |
754 | params.is_aarch32 = true; |
755 | params.is_32bit = true; | |
62a89c44 MZ |
756 | params.CRm = (hsr >> 1) & 0xf; |
757 | params.Rt = (hsr >> 5) & 0xf; | |
758 | params.is_write = ((hsr & 1) == 0); | |
759 | params.CRn = (hsr >> 10) & 0xf; | |
760 | params.Op0 = 0; | |
761 | params.Op1 = (hsr >> 14) & 0x7; | |
762 | params.Op2 = (hsr >> 17) & 0x7; | |
763 | ||
72564016 MZ |
764 | if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific)) |
765 | return 1; | |
766 | if (!emulate_cp(vcpu, ¶ms, global, nr_global)) | |
767 | return 1; | |
768 | ||
769 | unhandled_cp_access(vcpu, ¶ms); | |
62a89c44 MZ |
770 | return 1; |
771 | } | |
772 | ||
72564016 MZ |
773 | int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run) |
774 | { | |
775 | const struct sys_reg_desc *target_specific; | |
776 | size_t num; | |
777 | ||
778 | target_specific = get_target_table(vcpu->arch.target, false, &num); | |
779 | return kvm_handle_cp_64(vcpu, | |
a9866ba0 | 780 | cp15_64_regs, ARRAY_SIZE(cp15_64_regs), |
72564016 MZ |
781 | target_specific, num); |
782 | } | |
783 | ||
784 | int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
785 | { | |
786 | const struct sys_reg_desc *target_specific; | |
787 | size_t num; | |
788 | ||
789 | target_specific = get_target_table(vcpu->arch.target, false, &num); | |
790 | return kvm_handle_cp_32(vcpu, | |
791 | cp15_regs, ARRAY_SIZE(cp15_regs), | |
792 | target_specific, num); | |
793 | } | |
794 | ||
795 | int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
796 | { | |
797 | return kvm_handle_cp_64(vcpu, | |
a9866ba0 | 798 | cp14_64_regs, ARRAY_SIZE(cp14_64_regs), |
72564016 MZ |
799 | NULL, 0); |
800 | } | |
801 | ||
802 | int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
803 | { | |
804 | return kvm_handle_cp_32(vcpu, | |
805 | cp14_regs, ARRAY_SIZE(cp14_regs), | |
806 | NULL, 0); | |
807 | } | |
808 | ||
7c8c5e6a MZ |
809 | static int emulate_sys_reg(struct kvm_vcpu *vcpu, |
810 | const struct sys_reg_params *params) | |
811 | { | |
812 | size_t num; | |
813 | const struct sys_reg_desc *table, *r; | |
814 | ||
62a89c44 | 815 | table = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
816 | |
817 | /* Search target-specific then generic table. */ | |
818 | r = find_reg(params, table, num); | |
819 | if (!r) | |
820 | r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); | |
821 | ||
822 | if (likely(r)) { | |
823 | /* | |
824 | * Not having an accessor means that we have | |
825 | * configured a trap that we don't know how to | |
826 | * handle. This certainly qualifies as a gross bug | |
827 | * that should be fixed right away. | |
828 | */ | |
829 | BUG_ON(!r->access); | |
830 | ||
831 | if (likely(r->access(vcpu, params, r))) { | |
832 | /* Skip instruction, since it was emulated */ | |
833 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
834 | return 1; | |
835 | } | |
836 | /* If access function fails, it should complain. */ | |
837 | } else { | |
838 | kvm_err("Unsupported guest sys_reg access at: %lx\n", | |
839 | *vcpu_pc(vcpu)); | |
840 | print_sys_reg_instr(params); | |
841 | } | |
842 | kvm_inject_undefined(vcpu); | |
843 | return 1; | |
844 | } | |
845 | ||
846 | static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, | |
847 | const struct sys_reg_desc *table, size_t num) | |
848 | { | |
849 | unsigned long i; | |
850 | ||
851 | for (i = 0; i < num; i++) | |
852 | if (table[i].reset) | |
853 | table[i].reset(vcpu, &table[i]); | |
854 | } | |
855 | ||
856 | /** | |
857 | * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access | |
858 | * @vcpu: The VCPU pointer | |
859 | * @run: The kvm_run struct | |
860 | */ | |
861 | int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
862 | { | |
863 | struct sys_reg_params params; | |
864 | unsigned long esr = kvm_vcpu_get_hsr(vcpu); | |
865 | ||
2072d29c MZ |
866 | params.is_aarch32 = false; |
867 | params.is_32bit = false; | |
7c8c5e6a MZ |
868 | params.Op0 = (esr >> 20) & 3; |
869 | params.Op1 = (esr >> 14) & 0x7; | |
870 | params.CRn = (esr >> 10) & 0xf; | |
871 | params.CRm = (esr >> 1) & 0xf; | |
872 | params.Op2 = (esr >> 17) & 0x7; | |
873 | params.Rt = (esr >> 5) & 0x1f; | |
874 | params.is_write = !(esr & 1); | |
875 | ||
876 | return emulate_sys_reg(vcpu, ¶ms); | |
877 | } | |
878 | ||
879 | /****************************************************************************** | |
880 | * Userspace API | |
881 | *****************************************************************************/ | |
882 | ||
883 | static bool index_to_params(u64 id, struct sys_reg_params *params) | |
884 | { | |
885 | switch (id & KVM_REG_SIZE_MASK) { | |
886 | case KVM_REG_SIZE_U64: | |
887 | /* Any unused index bits means it's not valid. */ | |
888 | if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | |
889 | | KVM_REG_ARM_COPROC_MASK | |
890 | | KVM_REG_ARM64_SYSREG_OP0_MASK | |
891 | | KVM_REG_ARM64_SYSREG_OP1_MASK | |
892 | | KVM_REG_ARM64_SYSREG_CRN_MASK | |
893 | | KVM_REG_ARM64_SYSREG_CRM_MASK | |
894 | | KVM_REG_ARM64_SYSREG_OP2_MASK)) | |
895 | return false; | |
896 | params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) | |
897 | >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); | |
898 | params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) | |
899 | >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); | |
900 | params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) | |
901 | >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); | |
902 | params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) | |
903 | >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); | |
904 | params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) | |
905 | >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); | |
906 | return true; | |
907 | default: | |
908 | return false; | |
909 | } | |
910 | } | |
911 | ||
912 | /* Decode an index value, and find the sys_reg_desc entry. */ | |
913 | static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu, | |
914 | u64 id) | |
915 | { | |
916 | size_t num; | |
917 | const struct sys_reg_desc *table, *r; | |
918 | struct sys_reg_params params; | |
919 | ||
920 | /* We only do sys_reg for now. */ | |
921 | if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) | |
922 | return NULL; | |
923 | ||
924 | if (!index_to_params(id, ¶ms)) | |
925 | return NULL; | |
926 | ||
62a89c44 | 927 | table = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
928 | r = find_reg(¶ms, table, num); |
929 | if (!r) | |
930 | r = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); | |
931 | ||
932 | /* Not saved in the sys_reg array? */ | |
933 | if (r && !r->reg) | |
934 | r = NULL; | |
935 | ||
936 | return r; | |
937 | } | |
938 | ||
939 | /* | |
940 | * These are the invariant sys_reg registers: we let the guest see the | |
941 | * host versions of these, so they're part of the guest state. | |
942 | * | |
943 | * A future CPU may provide a mechanism to present different values to | |
944 | * the guest, or a future kvm may trap them. | |
945 | */ | |
946 | ||
947 | #define FUNCTION_INVARIANT(reg) \ | |
948 | static void get_##reg(struct kvm_vcpu *v, \ | |
949 | const struct sys_reg_desc *r) \ | |
950 | { \ | |
951 | u64 val; \ | |
952 | \ | |
953 | asm volatile("mrs %0, " __stringify(reg) "\n" \ | |
954 | : "=r" (val)); \ | |
955 | ((struct sys_reg_desc *)r)->val = val; \ | |
956 | } | |
957 | ||
958 | FUNCTION_INVARIANT(midr_el1) | |
959 | FUNCTION_INVARIANT(ctr_el0) | |
960 | FUNCTION_INVARIANT(revidr_el1) | |
961 | FUNCTION_INVARIANT(id_pfr0_el1) | |
962 | FUNCTION_INVARIANT(id_pfr1_el1) | |
963 | FUNCTION_INVARIANT(id_dfr0_el1) | |
964 | FUNCTION_INVARIANT(id_afr0_el1) | |
965 | FUNCTION_INVARIANT(id_mmfr0_el1) | |
966 | FUNCTION_INVARIANT(id_mmfr1_el1) | |
967 | FUNCTION_INVARIANT(id_mmfr2_el1) | |
968 | FUNCTION_INVARIANT(id_mmfr3_el1) | |
969 | FUNCTION_INVARIANT(id_isar0_el1) | |
970 | FUNCTION_INVARIANT(id_isar1_el1) | |
971 | FUNCTION_INVARIANT(id_isar2_el1) | |
972 | FUNCTION_INVARIANT(id_isar3_el1) | |
973 | FUNCTION_INVARIANT(id_isar4_el1) | |
974 | FUNCTION_INVARIANT(id_isar5_el1) | |
975 | FUNCTION_INVARIANT(clidr_el1) | |
976 | FUNCTION_INVARIANT(aidr_el1) | |
977 | ||
978 | /* ->val is filled in by kvm_sys_reg_table_init() */ | |
979 | static struct sys_reg_desc invariant_sys_regs[] = { | |
980 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b000), | |
981 | NULL, get_midr_el1 }, | |
982 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b110), | |
983 | NULL, get_revidr_el1 }, | |
984 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b000), | |
985 | NULL, get_id_pfr0_el1 }, | |
986 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b001), | |
987 | NULL, get_id_pfr1_el1 }, | |
988 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b010), | |
989 | NULL, get_id_dfr0_el1 }, | |
990 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b011), | |
991 | NULL, get_id_afr0_el1 }, | |
992 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b100), | |
993 | NULL, get_id_mmfr0_el1 }, | |
994 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b101), | |
995 | NULL, get_id_mmfr1_el1 }, | |
996 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b110), | |
997 | NULL, get_id_mmfr2_el1 }, | |
998 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b111), | |
999 | NULL, get_id_mmfr3_el1 }, | |
1000 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), | |
1001 | NULL, get_id_isar0_el1 }, | |
1002 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b001), | |
1003 | NULL, get_id_isar1_el1 }, | |
1004 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), | |
1005 | NULL, get_id_isar2_el1 }, | |
1006 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b011), | |
1007 | NULL, get_id_isar3_el1 }, | |
1008 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b100), | |
1009 | NULL, get_id_isar4_el1 }, | |
1010 | { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b101), | |
1011 | NULL, get_id_isar5_el1 }, | |
1012 | { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b001), | |
1013 | NULL, get_clidr_el1 }, | |
1014 | { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b111), | |
1015 | NULL, get_aidr_el1 }, | |
1016 | { Op0(0b11), Op1(0b011), CRn(0b0000), CRm(0b0000), Op2(0b001), | |
1017 | NULL, get_ctr_el0 }, | |
1018 | }; | |
1019 | ||
26c99af1 | 1020 | static int reg_from_user(u64 *val, const void __user *uaddr, u64 id) |
7c8c5e6a | 1021 | { |
7c8c5e6a MZ |
1022 | if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0) |
1023 | return -EFAULT; | |
1024 | return 0; | |
1025 | } | |
1026 | ||
26c99af1 | 1027 | static int reg_to_user(void __user *uaddr, const u64 *val, u64 id) |
7c8c5e6a | 1028 | { |
7c8c5e6a MZ |
1029 | if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0) |
1030 | return -EFAULT; | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static int get_invariant_sys_reg(u64 id, void __user *uaddr) | |
1035 | { | |
1036 | struct sys_reg_params params; | |
1037 | const struct sys_reg_desc *r; | |
1038 | ||
1039 | if (!index_to_params(id, ¶ms)) | |
1040 | return -ENOENT; | |
1041 | ||
1042 | r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); | |
1043 | if (!r) | |
1044 | return -ENOENT; | |
1045 | ||
1046 | return reg_to_user(uaddr, &r->val, id); | |
1047 | } | |
1048 | ||
1049 | static int set_invariant_sys_reg(u64 id, void __user *uaddr) | |
1050 | { | |
1051 | struct sys_reg_params params; | |
1052 | const struct sys_reg_desc *r; | |
1053 | int err; | |
1054 | u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */ | |
1055 | ||
1056 | if (!index_to_params(id, ¶ms)) | |
1057 | return -ENOENT; | |
1058 | r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); | |
1059 | if (!r) | |
1060 | return -ENOENT; | |
1061 | ||
1062 | err = reg_from_user(&val, uaddr, id); | |
1063 | if (err) | |
1064 | return err; | |
1065 | ||
1066 | /* This is what we mean by invariant: you can't change it. */ | |
1067 | if (r->val != val) | |
1068 | return -EINVAL; | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static bool is_valid_cache(u32 val) | |
1074 | { | |
1075 | u32 level, ctype; | |
1076 | ||
1077 | if (val >= CSSELR_MAX) | |
1078 | return -ENOENT; | |
1079 | ||
1080 | /* Bottom bit is Instruction or Data bit. Next 3 bits are level. */ | |
1081 | level = (val >> 1); | |
1082 | ctype = (cache_levels >> (level * 3)) & 7; | |
1083 | ||
1084 | switch (ctype) { | |
1085 | case 0: /* No cache */ | |
1086 | return false; | |
1087 | case 1: /* Instruction cache only */ | |
1088 | return (val & 1); | |
1089 | case 2: /* Data cache only */ | |
1090 | case 4: /* Unified cache */ | |
1091 | return !(val & 1); | |
1092 | case 3: /* Separate instruction and data caches */ | |
1093 | return true; | |
1094 | default: /* Reserved: we can't know instruction or data. */ | |
1095 | return false; | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | static int demux_c15_get(u64 id, void __user *uaddr) | |
1100 | { | |
1101 | u32 val; | |
1102 | u32 __user *uval = uaddr; | |
1103 | ||
1104 | /* Fail if we have unknown bits set. */ | |
1105 | if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK | |
1106 | | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) | |
1107 | return -ENOENT; | |
1108 | ||
1109 | switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { | |
1110 | case KVM_REG_ARM_DEMUX_ID_CCSIDR: | |
1111 | if (KVM_REG_SIZE(id) != 4) | |
1112 | return -ENOENT; | |
1113 | val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) | |
1114 | >> KVM_REG_ARM_DEMUX_VAL_SHIFT; | |
1115 | if (!is_valid_cache(val)) | |
1116 | return -ENOENT; | |
1117 | ||
1118 | return put_user(get_ccsidr(val), uval); | |
1119 | default: | |
1120 | return -ENOENT; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static int demux_c15_set(u64 id, void __user *uaddr) | |
1125 | { | |
1126 | u32 val, newval; | |
1127 | u32 __user *uval = uaddr; | |
1128 | ||
1129 | /* Fail if we have unknown bits set. */ | |
1130 | if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK | |
1131 | | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) | |
1132 | return -ENOENT; | |
1133 | ||
1134 | switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { | |
1135 | case KVM_REG_ARM_DEMUX_ID_CCSIDR: | |
1136 | if (KVM_REG_SIZE(id) != 4) | |
1137 | return -ENOENT; | |
1138 | val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) | |
1139 | >> KVM_REG_ARM_DEMUX_VAL_SHIFT; | |
1140 | if (!is_valid_cache(val)) | |
1141 | return -ENOENT; | |
1142 | ||
1143 | if (get_user(newval, uval)) | |
1144 | return -EFAULT; | |
1145 | ||
1146 | /* This is also invariant: you can't change it. */ | |
1147 | if (newval != get_ccsidr(val)) | |
1148 | return -EINVAL; | |
1149 | return 0; | |
1150 | default: | |
1151 | return -ENOENT; | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
1156 | { | |
1157 | const struct sys_reg_desc *r; | |
1158 | void __user *uaddr = (void __user *)(unsigned long)reg->addr; | |
1159 | ||
1160 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) | |
1161 | return demux_c15_get(reg->id, uaddr); | |
1162 | ||
1163 | if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) | |
1164 | return -ENOENT; | |
1165 | ||
1166 | r = index_to_sys_reg_desc(vcpu, reg->id); | |
1167 | if (!r) | |
1168 | return get_invariant_sys_reg(reg->id, uaddr); | |
1169 | ||
1170 | return reg_to_user(uaddr, &vcpu_sys_reg(vcpu, r->reg), reg->id); | |
1171 | } | |
1172 | ||
1173 | int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
1174 | { | |
1175 | const struct sys_reg_desc *r; | |
1176 | void __user *uaddr = (void __user *)(unsigned long)reg->addr; | |
1177 | ||
1178 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) | |
1179 | return demux_c15_set(reg->id, uaddr); | |
1180 | ||
1181 | if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) | |
1182 | return -ENOENT; | |
1183 | ||
1184 | r = index_to_sys_reg_desc(vcpu, reg->id); | |
1185 | if (!r) | |
1186 | return set_invariant_sys_reg(reg->id, uaddr); | |
1187 | ||
1188 | return reg_from_user(&vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id); | |
1189 | } | |
1190 | ||
1191 | static unsigned int num_demux_regs(void) | |
1192 | { | |
1193 | unsigned int i, count = 0; | |
1194 | ||
1195 | for (i = 0; i < CSSELR_MAX; i++) | |
1196 | if (is_valid_cache(i)) | |
1197 | count++; | |
1198 | ||
1199 | return count; | |
1200 | } | |
1201 | ||
1202 | static int write_demux_regids(u64 __user *uindices) | |
1203 | { | |
efd48cea | 1204 | u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; |
7c8c5e6a MZ |
1205 | unsigned int i; |
1206 | ||
1207 | val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; | |
1208 | for (i = 0; i < CSSELR_MAX; i++) { | |
1209 | if (!is_valid_cache(i)) | |
1210 | continue; | |
1211 | if (put_user(val | i, uindices)) | |
1212 | return -EFAULT; | |
1213 | uindices++; | |
1214 | } | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static u64 sys_reg_to_index(const struct sys_reg_desc *reg) | |
1219 | { | |
1220 | return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | | |
1221 | KVM_REG_ARM64_SYSREG | | |
1222 | (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | | |
1223 | (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | | |
1224 | (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | | |
1225 | (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | | |
1226 | (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); | |
1227 | } | |
1228 | ||
1229 | static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) | |
1230 | { | |
1231 | if (!*uind) | |
1232 | return true; | |
1233 | ||
1234 | if (put_user(sys_reg_to_index(reg), *uind)) | |
1235 | return false; | |
1236 | ||
1237 | (*uind)++; | |
1238 | return true; | |
1239 | } | |
1240 | ||
1241 | /* Assumed ordered tables, see kvm_sys_reg_table_init. */ | |
1242 | static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) | |
1243 | { | |
1244 | const struct sys_reg_desc *i1, *i2, *end1, *end2; | |
1245 | unsigned int total = 0; | |
1246 | size_t num; | |
1247 | ||
1248 | /* We check for duplicates here, to allow arch-specific overrides. */ | |
62a89c44 | 1249 | i1 = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
1250 | end1 = i1 + num; |
1251 | i2 = sys_reg_descs; | |
1252 | end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); | |
1253 | ||
1254 | BUG_ON(i1 == end1 || i2 == end2); | |
1255 | ||
1256 | /* Walk carefully, as both tables may refer to the same register. */ | |
1257 | while (i1 || i2) { | |
1258 | int cmp = cmp_sys_reg(i1, i2); | |
1259 | /* target-specific overrides generic entry. */ | |
1260 | if (cmp <= 0) { | |
1261 | /* Ignore registers we trap but don't save. */ | |
1262 | if (i1->reg) { | |
1263 | if (!copy_reg_to_user(i1, &uind)) | |
1264 | return -EFAULT; | |
1265 | total++; | |
1266 | } | |
1267 | } else { | |
1268 | /* Ignore registers we trap but don't save. */ | |
1269 | if (i2->reg) { | |
1270 | if (!copy_reg_to_user(i2, &uind)) | |
1271 | return -EFAULT; | |
1272 | total++; | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | if (cmp <= 0 && ++i1 == end1) | |
1277 | i1 = NULL; | |
1278 | if (cmp >= 0 && ++i2 == end2) | |
1279 | i2 = NULL; | |
1280 | } | |
1281 | return total; | |
1282 | } | |
1283 | ||
1284 | unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) | |
1285 | { | |
1286 | return ARRAY_SIZE(invariant_sys_regs) | |
1287 | + num_demux_regs() | |
1288 | + walk_sys_regs(vcpu, (u64 __user *)NULL); | |
1289 | } | |
1290 | ||
1291 | int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
1292 | { | |
1293 | unsigned int i; | |
1294 | int err; | |
1295 | ||
1296 | /* Then give them all the invariant registers' indices. */ | |
1297 | for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { | |
1298 | if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) | |
1299 | return -EFAULT; | |
1300 | uindices++; | |
1301 | } | |
1302 | ||
1303 | err = walk_sys_regs(vcpu, uindices); | |
1304 | if (err < 0) | |
1305 | return err; | |
1306 | uindices += err; | |
1307 | ||
1308 | return write_demux_regids(uindices); | |
1309 | } | |
1310 | ||
e6a95517 MZ |
1311 | static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n) |
1312 | { | |
1313 | unsigned int i; | |
1314 | ||
1315 | for (i = 1; i < n; i++) { | |
1316 | if (cmp_sys_reg(&table[i-1], &table[i]) >= 0) { | |
1317 | kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1); | |
1318 | return 1; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | return 0; | |
1323 | } | |
1324 | ||
7c8c5e6a MZ |
1325 | void kvm_sys_reg_table_init(void) |
1326 | { | |
1327 | unsigned int i; | |
1328 | struct sys_reg_desc clidr; | |
1329 | ||
1330 | /* Make sure tables are unique and in order. */ | |
e6a95517 MZ |
1331 | BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs))); |
1332 | BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs))); | |
1333 | BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs))); | |
1334 | BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs))); | |
1335 | BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs))); | |
1336 | BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs))); | |
7c8c5e6a MZ |
1337 | |
1338 | /* We abuse the reset function to overwrite the table itself. */ | |
1339 | for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) | |
1340 | invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); | |
1341 | ||
1342 | /* | |
1343 | * CLIDR format is awkward, so clean it up. See ARM B4.1.20: | |
1344 | * | |
1345 | * If software reads the Cache Type fields from Ctype1 | |
1346 | * upwards, once it has seen a value of 0b000, no caches | |
1347 | * exist at further-out levels of the hierarchy. So, for | |
1348 | * example, if Ctype3 is the first Cache Type field with a | |
1349 | * value of 0b000, the values of Ctype4 to Ctype7 must be | |
1350 | * ignored. | |
1351 | */ | |
1352 | get_clidr_el1(NULL, &clidr); /* Ugly... */ | |
1353 | cache_levels = clidr.val; | |
1354 | for (i = 0; i < 7; i++) | |
1355 | if (((cache_levels >> (i*3)) & 7) == 0) | |
1356 | break; | |
1357 | /* Clear all higher bits. */ | |
1358 | cache_levels &= (1 << (i*3))-1; | |
1359 | } | |
1360 | ||
1361 | /** | |
1362 | * kvm_reset_sys_regs - sets system registers to reset value | |
1363 | * @vcpu: The VCPU pointer | |
1364 | * | |
1365 | * This function finds the right table above and sets the registers on the | |
1366 | * virtual CPU struct to their architecturally defined reset values. | |
1367 | */ | |
1368 | void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) | |
1369 | { | |
1370 | size_t num; | |
1371 | const struct sys_reg_desc *table; | |
1372 | ||
1373 | /* Catch someone adding a register without putting in reset entry. */ | |
1374 | memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs)); | |
1375 | ||
1376 | /* Generic chip reset first (so target could override). */ | |
1377 | reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); | |
1378 | ||
62a89c44 | 1379 | table = get_target_table(vcpu->arch.target, true, &num); |
7c8c5e6a MZ |
1380 | reset_sys_reg_descs(vcpu, table, num); |
1381 | ||
1382 | for (num = 1; num < NR_SYS_REGS; num++) | |
1383 | if (vcpu_sys_reg(vcpu, num) == 0x4242424242424242) | |
1384 | panic("Didn't reset vcpu_sys_reg(%zi)", num); | |
1385 | } |