1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2011. Freescale Inc. All rights reserved.
4 *
5 * Authors:
6 * Alexander Graf <agraf@suse.de>
7 * Paul Mackerras <paulus@samba.org>
8 *
9 * Description:
10 *
11 * Hypercall handling for running PAPR guests in PR KVM on Book 3S
12 * processors.
13 */
14
15 #include <linux/anon_inodes.h>
16
17 #include <linux/uaccess.h>
18 #include <asm/kvm_ppc.h>
19 #include <asm/kvm_book3s.h>
20
21 #define HPTE_SIZE 16 /* bytes per HPT entry */
22
get_pteg_addr(struct kvm_vcpu * vcpu,long pte_index)23 static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
24 {
25 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
26 unsigned long pteg_addr;
27
28 pte_index <<= 4;
29 pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70;
30 pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
31 pteg_addr |= pte_index;
32
33 return pteg_addr;
34 }
35
kvmppc_h_pr_enter(struct kvm_vcpu * vcpu)36 static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
37 {
38 long flags = kvmppc_get_gpr(vcpu, 4);
39 long pte_index = kvmppc_get_gpr(vcpu, 5);
40 __be64 pteg[2 * 8];
41 __be64 *hpte;
42 unsigned long pteg_addr, i;
43 long int ret;
44
45 i = pte_index & 7;
46 pte_index &= ~7UL;
47 pteg_addr = get_pteg_addr(vcpu, pte_index);
48
49 mutex_lock(&vcpu->kvm->arch.hpt_mutex);
50 ret = H_FUNCTION;
51 if (copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg)))
52 goto done;
53 hpte = pteg;
54
55 ret = H_PTEG_FULL;
56 if (likely((flags & H_EXACT) == 0)) {
57 for (i = 0; ; ++i) {
58 if (i == 8)
59 goto done;
60 if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0)
61 break;
62 hpte += 2;
63 }
64 } else {
65 hpte += i * 2;
66 if (*hpte & HPTE_V_VALID)
67 goto done;
68 }
69
70 hpte[0] = cpu_to_be64(kvmppc_get_gpr(vcpu, 6));
71 hpte[1] = cpu_to_be64(kvmppc_get_gpr(vcpu, 7));
72 pteg_addr += i * HPTE_SIZE;
73 ret = H_FUNCTION;
74 if (copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE))
75 goto done;
76 kvmppc_set_gpr(vcpu, 4, pte_index | i);
77 ret = H_SUCCESS;
78
79 done:
80 mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
81 kvmppc_set_gpr(vcpu, 3, ret);
82
83 return EMULATE_DONE;
84 }
85
kvmppc_h_pr_remove(struct kvm_vcpu * vcpu)86 static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
87 {
88 unsigned long flags= kvmppc_get_gpr(vcpu, 4);
89 unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
90 unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
91 unsigned long v = 0, pteg, rb;
92 unsigned long pte[2];
93 long int ret;
94
95 pteg = get_pteg_addr(vcpu, pte_index);
96 mutex_lock(&vcpu->kvm->arch.hpt_mutex);
97 ret = H_FUNCTION;
98 if (copy_from_user(pte, (void __user *)pteg, sizeof(pte)))
99 goto done;
100 pte[0] = be64_to_cpu((__force __be64)pte[0]);
101 pte[1] = be64_to_cpu((__force __be64)pte[1]);
102
103 ret = H_NOT_FOUND;
104 if ((pte[0] & HPTE_V_VALID) == 0 ||
105 ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) ||
106 ((flags & H_ANDCOND) && (pte[0] & avpn) != 0))
107 goto done;
108
109 ret = H_FUNCTION;
110 if (copy_to_user((void __user *)pteg, &v, sizeof(v)))
111 goto done;
112
113 rb = compute_tlbie_rb(pte[0], pte[1], pte_index);
114 vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
115
116 ret = H_SUCCESS;
117 kvmppc_set_gpr(vcpu, 4, pte[0]);
118 kvmppc_set_gpr(vcpu, 5, pte[1]);
119
120 done:
121 mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
122 kvmppc_set_gpr(vcpu, 3, ret);
123
124 return EMULATE_DONE;
125 }
126
127 /* Request defs for kvmppc_h_pr_bulk_remove() */
128 #define H_BULK_REMOVE_TYPE 0xc000000000000000ULL
129 #define H_BULK_REMOVE_REQUEST 0x4000000000000000ULL
130 #define H_BULK_REMOVE_RESPONSE 0x8000000000000000ULL
131 #define H_BULK_REMOVE_END 0xc000000000000000ULL
132 #define H_BULK_REMOVE_CODE 0x3000000000000000ULL
133 #define H_BULK_REMOVE_SUCCESS 0x0000000000000000ULL
134 #define H_BULK_REMOVE_NOT_FOUND 0x1000000000000000ULL
135 #define H_BULK_REMOVE_PARM 0x2000000000000000ULL
136 #define H_BULK_REMOVE_HW 0x3000000000000000ULL
137 #define H_BULK_REMOVE_RC 0x0c00000000000000ULL
138 #define H_BULK_REMOVE_FLAGS 0x0300000000000000ULL
139 #define H_BULK_REMOVE_ABSOLUTE 0x0000000000000000ULL
140 #define H_BULK_REMOVE_ANDCOND 0x0100000000000000ULL
141 #define H_BULK_REMOVE_AVPN 0x0200000000000000ULL
142 #define H_BULK_REMOVE_PTEX 0x00ffffffffffffffULL
143 #define H_BULK_REMOVE_MAX_BATCH 4
144
kvmppc_h_pr_bulk_remove(struct kvm_vcpu * vcpu)145 static int kvmppc_h_pr_bulk_remove(struct kvm_vcpu *vcpu)
146 {
147 int i;
148 int paramnr = 4;
149 int ret = H_SUCCESS;
150
151 mutex_lock(&vcpu->kvm->arch.hpt_mutex);
152 for (i = 0; i < H_BULK_REMOVE_MAX_BATCH; i++) {
153 unsigned long tsh = kvmppc_get_gpr(vcpu, paramnr+(2*i));
154 unsigned long tsl = kvmppc_get_gpr(vcpu, paramnr+(2*i)+1);
155 unsigned long pteg, rb, flags;
156 unsigned long pte[2];
157 unsigned long v = 0;
158
159 if ((tsh & H_BULK_REMOVE_TYPE) == H_BULK_REMOVE_END) {
160 break; /* Exit success */
161 } else if ((tsh & H_BULK_REMOVE_TYPE) !=
162 H_BULK_REMOVE_REQUEST) {
163 ret = H_PARAMETER;
164 break; /* Exit fail */
165 }
166
167 tsh &= H_BULK_REMOVE_PTEX | H_BULK_REMOVE_FLAGS;
168 tsh |= H_BULK_REMOVE_RESPONSE;
169
170 if ((tsh & H_BULK_REMOVE_ANDCOND) &&
171 (tsh & H_BULK_REMOVE_AVPN)) {
172 tsh |= H_BULK_REMOVE_PARM;
173 kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
174 ret = H_PARAMETER;
175 break; /* Exit fail */
176 }
177
178 pteg = get_pteg_addr(vcpu, tsh & H_BULK_REMOVE_PTEX);
179 if (copy_from_user(pte, (void __user *)pteg, sizeof(pte))) {
180 ret = H_FUNCTION;
181 break;
182 }
183 pte[0] = be64_to_cpu((__force __be64)pte[0]);
184 pte[1] = be64_to_cpu((__force __be64)pte[1]);
185
186 /* tsl = AVPN */
187 flags = (tsh & H_BULK_REMOVE_FLAGS) >> 26;
188
189 if ((pte[0] & HPTE_V_VALID) == 0 ||
190 ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != tsl) ||
191 ((flags & H_ANDCOND) && (pte[0] & tsl) != 0)) {
192 tsh |= H_BULK_REMOVE_NOT_FOUND;
193 } else {
194 /* Splat the pteg in (userland) hpt */
195 if (copy_to_user((void __user *)pteg, &v, sizeof(v))) {
196 ret = H_FUNCTION;
197 break;
198 }
199
200 rb = compute_tlbie_rb(pte[0], pte[1],
201 tsh & H_BULK_REMOVE_PTEX);
202 vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
203 tsh |= H_BULK_REMOVE_SUCCESS;
204 tsh |= (pte[1] & (HPTE_R_C | HPTE_R_R)) << 43;
205 }
206 kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
207 }
208 mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
209 kvmppc_set_gpr(vcpu, 3, ret);
210
211 return EMULATE_DONE;
212 }
213
kvmppc_h_pr_protect(struct kvm_vcpu * vcpu)214 static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
215 {
216 unsigned long flags = kvmppc_get_gpr(vcpu, 4);
217 unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
218 unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
219 unsigned long rb, pteg, r, v;
220 unsigned long pte[2];
221 long int ret;
222
223 pteg = get_pteg_addr(vcpu, pte_index);
224 mutex_lock(&vcpu->kvm->arch.hpt_mutex);
225 ret = H_FUNCTION;
226 if (copy_from_user(pte, (void __user *)pteg, sizeof(pte)))
227 goto done;
228 pte[0] = be64_to_cpu((__force __be64)pte[0]);
229 pte[1] = be64_to_cpu((__force __be64)pte[1]);
230
231 ret = H_NOT_FOUND;
232 if ((pte[0] & HPTE_V_VALID) == 0 ||
233 ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn))
234 goto done;
235
236 v = pte[0];
237 r = pte[1];
238 r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI |
239 HPTE_R_KEY_LO);
240 r |= (flags << 55) & HPTE_R_PP0;
241 r |= (flags << 48) & HPTE_R_KEY_HI;
242 r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
243
244 pte[1] = r;
245
246 rb = compute_tlbie_rb(v, r, pte_index);
247 vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
248 pte[0] = (__force u64)cpu_to_be64(pte[0]);
249 pte[1] = (__force u64)cpu_to_be64(pte[1]);
250 ret = H_FUNCTION;
251 if (copy_to_user((void __user *)pteg, pte, sizeof(pte)))
252 goto done;
253 ret = H_SUCCESS;
254
255 done:
256 mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
257 kvmppc_set_gpr(vcpu, 3, ret);
258
259 return EMULATE_DONE;
260 }
261
kvmppc_h_pr_logical_ci_load(struct kvm_vcpu * vcpu)262 static int kvmppc_h_pr_logical_ci_load(struct kvm_vcpu *vcpu)
263 {
264 long rc;
265
266 rc = kvmppc_h_logical_ci_load(vcpu);
267 if (rc == H_TOO_HARD)
268 return EMULATE_FAIL;
269 kvmppc_set_gpr(vcpu, 3, rc);
270 return EMULATE_DONE;
271 }
272
kvmppc_h_pr_logical_ci_store(struct kvm_vcpu * vcpu)273 static int kvmppc_h_pr_logical_ci_store(struct kvm_vcpu *vcpu)
274 {
275 long rc;
276
277 rc = kvmppc_h_logical_ci_store(vcpu);
278 if (rc == H_TOO_HARD)
279 return EMULATE_FAIL;
280 kvmppc_set_gpr(vcpu, 3, rc);
281 return EMULATE_DONE;
282 }
283
284 #ifdef CONFIG_SPAPR_TCE_IOMMU
kvmppc_h_pr_put_tce(struct kvm_vcpu * vcpu)285 static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
286 {
287 unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
288 unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
289 unsigned long tce = kvmppc_get_gpr(vcpu, 6);
290 long rc;
291
292 rc = kvmppc_h_put_tce(vcpu, liobn, ioba, tce);
293 if (rc == H_TOO_HARD)
294 return EMULATE_FAIL;
295 kvmppc_set_gpr(vcpu, 3, rc);
296 return EMULATE_DONE;
297 }
298
kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu * vcpu)299 static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu)
300 {
301 unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
302 unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
303 unsigned long tce = kvmppc_get_gpr(vcpu, 6);
304 unsigned long npages = kvmppc_get_gpr(vcpu, 7);
305 long rc;
306
307 rc = kvmppc_h_put_tce_indirect(vcpu, liobn, ioba,
308 tce, npages);
309 if (rc == H_TOO_HARD)
310 return EMULATE_FAIL;
311 kvmppc_set_gpr(vcpu, 3, rc);
312 return EMULATE_DONE;
313 }
314
kvmppc_h_pr_stuff_tce(struct kvm_vcpu * vcpu)315 static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu)
316 {
317 unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
318 unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
319 unsigned long tce_value = kvmppc_get_gpr(vcpu, 6);
320 unsigned long npages = kvmppc_get_gpr(vcpu, 7);
321 long rc;
322
323 rc = kvmppc_h_stuff_tce(vcpu, liobn, ioba, tce_value, npages);
324 if (rc == H_TOO_HARD)
325 return EMULATE_FAIL;
326 kvmppc_set_gpr(vcpu, 3, rc);
327 return EMULATE_DONE;
328 }
329
330 #else /* CONFIG_SPAPR_TCE_IOMMU */
kvmppc_h_pr_put_tce(struct kvm_vcpu * vcpu)331 static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
332 {
333 return EMULATE_FAIL;
334 }
335
kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu * vcpu)336 static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu)
337 {
338 return EMULATE_FAIL;
339 }
340
kvmppc_h_pr_stuff_tce(struct kvm_vcpu * vcpu)341 static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu)
342 {
343 return EMULATE_FAIL;
344 }
345 #endif /* CONFIG_SPAPR_TCE_IOMMU */
346
kvmppc_h_pr_xics_hcall(struct kvm_vcpu * vcpu,u32 cmd)347 static int kvmppc_h_pr_xics_hcall(struct kvm_vcpu *vcpu, u32 cmd)
348 {
349 long rc = kvmppc_xics_hcall(vcpu, cmd);
350 kvmppc_set_gpr(vcpu, 3, rc);
351 return EMULATE_DONE;
352 }
353
kvmppc_h_pr(struct kvm_vcpu * vcpu,unsigned long cmd)354 int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
355 {
356 int rc, idx;
357
358 if (cmd <= MAX_HCALL_OPCODE &&
359 !test_bit(cmd/4, vcpu->kvm->arch.enabled_hcalls))
360 return EMULATE_FAIL;
361
362 switch (cmd) {
363 case H_ENTER:
364 return kvmppc_h_pr_enter(vcpu);
365 case H_REMOVE:
366 return kvmppc_h_pr_remove(vcpu);
367 case H_PROTECT:
368 return kvmppc_h_pr_protect(vcpu);
369 case H_BULK_REMOVE:
370 return kvmppc_h_pr_bulk_remove(vcpu);
371 case H_PUT_TCE:
372 return kvmppc_h_pr_put_tce(vcpu);
373 case H_PUT_TCE_INDIRECT:
374 return kvmppc_h_pr_put_tce_indirect(vcpu);
375 case H_STUFF_TCE:
376 return kvmppc_h_pr_stuff_tce(vcpu);
377 case H_CEDE:
378 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
379 kvm_vcpu_block(vcpu);
380 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
381 vcpu->stat.halt_wakeup++;
382 return EMULATE_DONE;
383 case H_LOGICAL_CI_LOAD:
384 return kvmppc_h_pr_logical_ci_load(vcpu);
385 case H_LOGICAL_CI_STORE:
386 return kvmppc_h_pr_logical_ci_store(vcpu);
387 case H_XIRR:
388 case H_CPPR:
389 case H_EOI:
390 case H_IPI:
391 case H_IPOLL:
392 case H_XIRR_X:
393 if (kvmppc_xics_enabled(vcpu))
394 return kvmppc_h_pr_xics_hcall(vcpu, cmd);
395 break;
396 case H_RTAS:
397 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
398 break;
399 idx = srcu_read_lock(&vcpu->kvm->srcu);
400 rc = kvmppc_rtas_hcall(vcpu);
401 srcu_read_unlock(&vcpu->kvm->srcu, idx);
402 if (rc)
403 break;
404 kvmppc_set_gpr(vcpu, 3, 0);
405 return EMULATE_DONE;
406 }
407
408 return EMULATE_FAIL;
409 }
410
kvmppc_hcall_impl_pr(unsigned long cmd)411 int kvmppc_hcall_impl_pr(unsigned long cmd)
412 {
413 switch (cmd) {
414 case H_ENTER:
415 case H_REMOVE:
416 case H_PROTECT:
417 case H_BULK_REMOVE:
418 case H_PUT_TCE:
419 case H_PUT_TCE_INDIRECT:
420 case H_STUFF_TCE:
421 case H_CEDE:
422 case H_LOGICAL_CI_LOAD:
423 case H_LOGICAL_CI_STORE:
424 #ifdef CONFIG_KVM_XICS
425 case H_XIRR:
426 case H_CPPR:
427 case H_EOI:
428 case H_IPI:
429 case H_IPOLL:
430 case H_XIRR_X:
431 #endif
432 return 1;
433 }
434 return 0;
435 }
436
437 /*
438 * List of hcall numbers to enable by default.
439 * For compatibility with old userspace, we enable by default
440 * all hcalls that were implemented before the hcall-enabling
441 * facility was added. Note this list should not include H_RTAS.
442 */
443 static unsigned int default_hcall_list[] = {
444 H_ENTER,
445 H_REMOVE,
446 H_PROTECT,
447 H_BULK_REMOVE,
448 H_PUT_TCE,
449 H_CEDE,
450 #ifdef CONFIG_KVM_XICS
451 H_XIRR,
452 H_CPPR,
453 H_EOI,
454 H_IPI,
455 H_IPOLL,
456 H_XIRR_X,
457 #endif
458 0
459 };
460
kvmppc_pr_init_default_hcalls(struct kvm * kvm)461 void kvmppc_pr_init_default_hcalls(struct kvm *kvm)
462 {
463 int i;
464 unsigned int hcall;
465
466 for (i = 0; default_hcall_list[i]; ++i) {
467 hcall = default_hcall_list[i];
468 WARN_ON(!kvmppc_hcall_impl_pr(hcall));
469 __set_bit(hcall / 4, kvm->arch.enabled_hcalls);
470 }
471 }
472
