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 
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 
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 
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 
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 
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 
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 
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
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 
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 
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 */
331 static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
332 {
333 	return EMULATE_FAIL;
334 }
335 
336 static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu)
337 {
338 	return EMULATE_FAIL;
339 }
340 
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 
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 
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_halt(vcpu);
380 		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
381 		vcpu->stat.generic.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 
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 
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