1 /*
2 * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
3 *
4 * Author: Varun Sethi, <varun.sethi@freescale.com>
5 *
6 * Description:
7 * This file is derived from arch/powerpc/kvm/e500.c,
8 * by Yu Liu <yu.liu@freescale.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
15 #include <linux/kvm_host.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18 #include <linux/export.h>
19 #include <linux/miscdevice.h>
20 #include <linux/module.h>
21
22 #include <asm/reg.h>
23 #include <asm/cputable.h>
24 #include <asm/kvm_ppc.h>
25 #include <asm/dbell.h>
26
27 #include "booke.h"
28 #include "e500.h"
29
kvmppc_set_pending_interrupt(struct kvm_vcpu * vcpu,enum int_class type)30 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
31 {
32 enum ppc_dbell dbell_type;
33 unsigned long tag;
34
35 switch (type) {
36 case INT_CLASS_NONCRIT:
37 dbell_type = PPC_G_DBELL;
38 break;
39 case INT_CLASS_CRIT:
40 dbell_type = PPC_G_DBELL_CRIT;
41 break;
42 case INT_CLASS_MC:
43 dbell_type = PPC_G_DBELL_MC;
44 break;
45 default:
46 WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
47 return;
48 }
49
50 preempt_disable();
51 tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
52 mb();
53 ppc_msgsnd(dbell_type, 0, tag);
54 preempt_enable();
55 }
56
57 /* gtlbe must not be mapped by more than one host tlb entry */
kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 * vcpu_e500,struct kvm_book3e_206_tlb_entry * gtlbe)58 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
59 struct kvm_book3e_206_tlb_entry *gtlbe)
60 {
61 unsigned int tid, ts;
62 gva_t eaddr;
63 u32 val;
64 unsigned long flags;
65
66 ts = get_tlb_ts(gtlbe);
67 tid = get_tlb_tid(gtlbe);
68
69 /* We search the host TLB to invalidate its shadow TLB entry */
70 val = (tid << 16) | ts;
71 eaddr = get_tlb_eaddr(gtlbe);
72
73 local_irq_save(flags);
74
75 mtspr(SPRN_MAS6, val);
76 mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
77
78 asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
79 val = mfspr(SPRN_MAS1);
80 if (val & MAS1_VALID) {
81 mtspr(SPRN_MAS1, val & ~MAS1_VALID);
82 asm volatile("tlbwe");
83 }
84 mtspr(SPRN_MAS5, 0);
85 /* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
86 mtspr(SPRN_MAS8, 0);
87 isync();
88
89 local_irq_restore(flags);
90 }
91
kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 * vcpu_e500)92 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
93 {
94 unsigned long flags;
95
96 local_irq_save(flags);
97 mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
98 asm volatile("tlbilxlpid");
99 mtspr(SPRN_MAS5, 0);
100 local_irq_restore(flags);
101 }
102
kvmppc_set_pid(struct kvm_vcpu * vcpu,u32 pid)103 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
104 {
105 vcpu->arch.pid = pid;
106 }
107
kvmppc_mmu_msr_notify(struct kvm_vcpu * vcpu,u32 old_msr)108 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
109 {
110 }
111
112 /* We use two lpids per VM */
113 static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
114
kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu * vcpu,int cpu)115 static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
116 {
117 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
118
119 kvmppc_booke_vcpu_load(vcpu, cpu);
120
121 mtspr(SPRN_LPID, get_lpid(vcpu));
122 mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
123 mtspr(SPRN_GPIR, vcpu->vcpu_id);
124 mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
125 vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
126 vcpu->arch.epsc = vcpu->arch.eplc;
127 mtspr(SPRN_EPLC, vcpu->arch.eplc);
128 mtspr(SPRN_EPSC, vcpu->arch.epsc);
129
130 mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
131 mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
132 mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
133 mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
134 mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
135 mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
136 mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
137
138 mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
139 mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
140
141 mtspr(SPRN_GEPR, vcpu->arch.epr);
142 mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
143 mtspr(SPRN_GESR, vcpu->arch.shared->esr);
144
145 if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
146 __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
147 kvmppc_e500_tlbil_all(vcpu_e500);
148 __this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
149 }
150 }
151
kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu * vcpu)152 static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
153 {
154 vcpu->arch.eplc = mfspr(SPRN_EPLC);
155 vcpu->arch.epsc = mfspr(SPRN_EPSC);
156
157 vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
158 vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
159 vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
160 vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
161
162 vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
163 vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
164
165 vcpu->arch.epr = mfspr(SPRN_GEPR);
166 vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
167 vcpu->arch.shared->esr = mfspr(SPRN_GESR);
168
169 vcpu->arch.oldpir = mfspr(SPRN_PIR);
170
171 kvmppc_booke_vcpu_put(vcpu);
172 }
173
kvmppc_core_check_processor_compat(void)174 int kvmppc_core_check_processor_compat(void)
175 {
176 int r;
177
178 if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
179 r = 0;
180 else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
181 r = 0;
182 #ifdef CONFIG_ALTIVEC
183 /*
184 * Since guests have the privilege to enable AltiVec, we need AltiVec
185 * support in the host to save/restore their context.
186 * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
187 * because it's cleared in the absence of CONFIG_ALTIVEC!
188 */
189 else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
190 r = 0;
191 #endif
192 else
193 r = -ENOTSUPP;
194
195 return r;
196 }
197
kvmppc_core_vcpu_setup(struct kvm_vcpu * vcpu)198 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
199 {
200 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
201
202 vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
203 SPRN_EPCR_DUVD;
204 #ifdef CONFIG_64BIT
205 vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
206 #endif
207 vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;
208
209 vcpu->arch.pvr = mfspr(SPRN_PVR);
210 vcpu_e500->svr = mfspr(SPRN_SVR);
211
212 vcpu->arch.cpu_type = KVM_CPU_E500MC;
213
214 return 0;
215 }
216
kvmppc_core_get_sregs_e500mc(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)217 static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
218 struct kvm_sregs *sregs)
219 {
220 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
221
222 sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
223 KVM_SREGS_E_PC;
224 sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
225
226 sregs->u.e.impl.fsl.features = 0;
227 sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
228 sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
229 sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
230
231 kvmppc_get_sregs_e500_tlb(vcpu, sregs);
232
233 sregs->u.e.ivor_high[3] =
234 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
235 sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
236 sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
237
238 return kvmppc_get_sregs_ivor(vcpu, sregs);
239 }
240
kvmppc_core_set_sregs_e500mc(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)241 static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
242 struct kvm_sregs *sregs)
243 {
244 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
245 int ret;
246
247 if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
248 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
249 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
250 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
251 }
252
253 ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
254 if (ret < 0)
255 return ret;
256
257 if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
258 return 0;
259
260 if (sregs->u.e.features & KVM_SREGS_E_PM) {
261 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
262 sregs->u.e.ivor_high[3];
263 }
264
265 if (sregs->u.e.features & KVM_SREGS_E_PC) {
266 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
267 sregs->u.e.ivor_high[4];
268 vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
269 sregs->u.e.ivor_high[5];
270 }
271
272 return kvmppc_set_sregs_ivor(vcpu, sregs);
273 }
274
kvmppc_get_one_reg_e500mc(struct kvm_vcpu * vcpu,u64 id,union kvmppc_one_reg * val)275 static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
276 union kvmppc_one_reg *val)
277 {
278 int r = 0;
279
280 switch (id) {
281 case KVM_REG_PPC_SPRG9:
282 *val = get_reg_val(id, vcpu->arch.sprg9);
283 break;
284 default:
285 r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
286 }
287
288 return r;
289 }
290
kvmppc_set_one_reg_e500mc(struct kvm_vcpu * vcpu,u64 id,union kvmppc_one_reg * val)291 static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
292 union kvmppc_one_reg *val)
293 {
294 int r = 0;
295
296 switch (id) {
297 case KVM_REG_PPC_SPRG9:
298 vcpu->arch.sprg9 = set_reg_val(id, *val);
299 break;
300 default:
301 r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
302 }
303
304 return r;
305 }
306
kvmppc_core_vcpu_create_e500mc(struct kvm * kvm,unsigned int id)307 static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
308 unsigned int id)
309 {
310 struct kvmppc_vcpu_e500 *vcpu_e500;
311 struct kvm_vcpu *vcpu;
312 int err;
313
314 vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
315 if (!vcpu_e500) {
316 err = -ENOMEM;
317 goto out;
318 }
319 vcpu = &vcpu_e500->vcpu;
320
321 /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
322 vcpu->arch.oldpir = 0xffffffff;
323
324 err = kvm_vcpu_init(vcpu, kvm, id);
325 if (err)
326 goto free_vcpu;
327
328 err = kvmppc_e500_tlb_init(vcpu_e500);
329 if (err)
330 goto uninit_vcpu;
331
332 vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
333 if (!vcpu->arch.shared) {
334 err = -ENOMEM;
335 goto uninit_tlb;
336 }
337
338 return vcpu;
339
340 uninit_tlb:
341 kvmppc_e500_tlb_uninit(vcpu_e500);
342 uninit_vcpu:
343 kvm_vcpu_uninit(vcpu);
344
345 free_vcpu:
346 kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
347 out:
348 return ERR_PTR(err);
349 }
350
kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu * vcpu)351 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
352 {
353 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
354
355 free_page((unsigned long)vcpu->arch.shared);
356 kvmppc_e500_tlb_uninit(vcpu_e500);
357 kvm_vcpu_uninit(vcpu);
358 kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
359 }
360
kvmppc_core_init_vm_e500mc(struct kvm * kvm)361 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
362 {
363 int lpid;
364
365 lpid = kvmppc_alloc_lpid();
366 if (lpid < 0)
367 return lpid;
368
369 /*
370 * Use two lpids per VM on cores with two threads like e6500. Use
371 * even numbers to speedup vcpu lpid computation with consecutive lpids
372 * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
373 */
374 if (threads_per_core == 2)
375 lpid <<= 1;
376
377 kvm->arch.lpid = lpid;
378 return 0;
379 }
380
kvmppc_core_destroy_vm_e500mc(struct kvm * kvm)381 static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
382 {
383 int lpid = kvm->arch.lpid;
384
385 if (threads_per_core == 2)
386 lpid >>= 1;
387
388 kvmppc_free_lpid(lpid);
389 }
390
391 static struct kvmppc_ops kvm_ops_e500mc = {
392 .get_sregs = kvmppc_core_get_sregs_e500mc,
393 .set_sregs = kvmppc_core_set_sregs_e500mc,
394 .get_one_reg = kvmppc_get_one_reg_e500mc,
395 .set_one_reg = kvmppc_set_one_reg_e500mc,
396 .vcpu_load = kvmppc_core_vcpu_load_e500mc,
397 .vcpu_put = kvmppc_core_vcpu_put_e500mc,
398 .vcpu_create = kvmppc_core_vcpu_create_e500mc,
399 .vcpu_free = kvmppc_core_vcpu_free_e500mc,
400 .mmu_destroy = kvmppc_mmu_destroy_e500,
401 .init_vm = kvmppc_core_init_vm_e500mc,
402 .destroy_vm = kvmppc_core_destroy_vm_e500mc,
403 .emulate_op = kvmppc_core_emulate_op_e500,
404 .emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
405 .emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
406 };
407
kvmppc_e500mc_init(void)408 static int __init kvmppc_e500mc_init(void)
409 {
410 int r;
411
412 r = kvmppc_booke_init();
413 if (r)
414 goto err_out;
415
416 /*
417 * Use two lpids per VM on dual threaded processors like e6500
418 * to workarround the lack of tlb write conditional instruction.
419 * Expose half the number of available hardware lpids to the lpid
420 * allocator.
421 */
422 kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
423 kvmppc_claim_lpid(0); /* host */
424
425 r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
426 if (r)
427 goto err_out;
428 kvm_ops_e500mc.owner = THIS_MODULE;
429 kvmppc_pr_ops = &kvm_ops_e500mc;
430
431 err_out:
432 return r;
433 }
434
kvmppc_e500mc_exit(void)435 static void __exit kvmppc_e500mc_exit(void)
436 {
437 kvmppc_pr_ops = NULL;
438 kvmppc_booke_exit();
439 }
440
441 module_init(kvmppc_e500mc_init);
442 module_exit(kvmppc_e500mc_exit);
443 MODULE_ALIAS_MISCDEV(KVM_MINOR);
444 MODULE_ALIAS("devname:kvm");
445
