summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/e500mc.c
blob: f48a0c22e8f9024e87965df7b0821596d43c926a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
/*
 * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Varun Sethi, <varun.sethi@freescale.com>
 *
 * Description:
 * This file is derived from arch/powerpc/kvm/e500.c,
 * by Yu Liu <yu.liu@freescale.com>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 */

#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/miscdevice.h>
#include <linux/module.h>

#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/dbell.h>

#include "booke.h"
#include "e500.h"

void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
{
	enum ppc_dbell dbell_type;
	unsigned long tag;

	switch (type) {
	case INT_CLASS_NONCRIT:
		dbell_type = PPC_G_DBELL;
		break;
	case INT_CLASS_CRIT:
		dbell_type = PPC_G_DBELL_CRIT;
		break;
	case INT_CLASS_MC:
		dbell_type = PPC_G_DBELL_MC;
		break;
	default:
		WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
		return;
	}

	preempt_disable();
	tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
	mb();
	ppc_msgsnd(dbell_type, 0, tag);
	preempt_enable();
}

/* gtlbe must not be mapped by more than one host tlb entry */
void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
			   struct kvm_book3e_206_tlb_entry *gtlbe)
{
	unsigned int tid, ts;
	gva_t eaddr;
	u32 val;
	unsigned long flags;

	ts = get_tlb_ts(gtlbe);
	tid = get_tlb_tid(gtlbe);

	/* We search the host TLB to invalidate its shadow TLB entry */
	val = (tid << 16) | ts;
	eaddr = get_tlb_eaddr(gtlbe);

	local_irq_save(flags);

	mtspr(SPRN_MAS6, val);
	mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));

	asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
	val = mfspr(SPRN_MAS1);
	if (val & MAS1_VALID) {
		mtspr(SPRN_MAS1, val & ~MAS1_VALID);
		asm volatile("tlbwe");
	}
	mtspr(SPRN_MAS5, 0);
	/* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
	mtspr(SPRN_MAS8, 0);
	isync();

	local_irq_restore(flags);
}

void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
{
	unsigned long flags;

	local_irq_save(flags);
	mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
	asm volatile("tlbilxlpid");
	mtspr(SPRN_MAS5, 0);
	local_irq_restore(flags);
}

void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
{
	vcpu->arch.pid = pid;
}

void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
{
}

/* We use two lpids per VM */
static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);

static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);

	kvmppc_booke_vcpu_load(vcpu, cpu);

	mtspr(SPRN_LPID, get_lpid(vcpu));
	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
	mtspr(SPRN_GPIR, vcpu->vcpu_id);
	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
	vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
	vcpu->arch.epsc = vcpu->arch.eplc;
	mtspr(SPRN_EPLC, vcpu->arch.eplc);
	mtspr(SPRN_EPSC, vcpu->arch.epsc);

	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);

	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);

	mtspr(SPRN_GEPR, vcpu->arch.epr);
	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
	mtspr(SPRN_GESR, vcpu->arch.shared->esr);

	if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
	    __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
		kvmppc_e500_tlbil_all(vcpu_e500);
		__this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
	}
}

static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
{
	vcpu->arch.eplc = mfspr(SPRN_EPLC);
	vcpu->arch.epsc = mfspr(SPRN_EPSC);

	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);

	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);

	vcpu->arch.epr = mfspr(SPRN_GEPR);
	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
	vcpu->arch.shared->esr = mfspr(SPRN_GESR);

	vcpu->arch.oldpir = mfspr(SPRN_PIR);

	kvmppc_booke_vcpu_put(vcpu);
}

int kvmppc_core_check_processor_compat(void)
{
	int r;

	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
		r = 0;
	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
		r = 0;
#ifdef CONFIG_ALTIVEC
	/*
	 * Since guests have the privilege to enable AltiVec, we need AltiVec
	 * support in the host to save/restore their context.
	 * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
	 * because it's cleared in the absence of CONFIG_ALTIVEC!
	 */
	else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
		r = 0;
#endif
	else
		r = -ENOTSUPP;

	return r;
}

int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);

	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
				 SPRN_EPCR_DUVD;
#ifdef CONFIG_64BIT
	vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
#endif
	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;

	vcpu->arch.pvr = mfspr(SPRN_PVR);
	vcpu_e500->svr = mfspr(SPRN_SVR);

	vcpu->arch.cpu_type = KVM_CPU_E500MC;

	return 0;
}

static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
					struct kvm_sregs *sregs)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);

	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
			       KVM_SREGS_E_PC;
	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;

	sregs->u.e.impl.fsl.features = 0;
	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;

	kvmppc_get_sregs_e500_tlb(vcpu, sregs);

	sregs->u.e.ivor_high[3] =
		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];

	return kvmppc_get_sregs_ivor(vcpu, sregs);
}

static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
					struct kvm_sregs *sregs)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	int ret;

	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
	}

	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
	if (ret < 0)
		return ret;

	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
		return 0;

	if (sregs->u.e.features & KVM_SREGS_E_PM) {
		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
			sregs->u.e.ivor_high[3];
	}

	if (sregs->u.e.features & KVM_SREGS_E_PC) {
		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
			sregs->u.e.ivor_high[4];
		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
			sregs->u.e.ivor_high[5];
	}

	return kvmppc_set_sregs_ivor(vcpu, sregs);
}

static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
			      union kvmppc_one_reg *val)
{
	int r = 0;

	switch (id) {
	case KVM_REG_PPC_SPRG9:
		*val = get_reg_val(id, vcpu->arch.sprg9);
		break;
	default:
		r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
	}

	return r;
}

static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
			      union kvmppc_one_reg *val)
{
	int r = 0;

	switch (id) {
	case KVM_REG_PPC_SPRG9:
		vcpu->arch.sprg9 = set_reg_val(id, *val);
		break;
	default:
		r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
	}

	return r;
}

static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
						       unsigned int id)
{
	struct kvmppc_vcpu_e500 *vcpu_e500;
	struct kvm_vcpu *vcpu;
	int err;

	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
	if (!vcpu_e500) {
		err = -ENOMEM;
		goto out;
	}
	vcpu = &vcpu_e500->vcpu;

	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
	vcpu->arch.oldpir = 0xffffffff;

	err = kvm_vcpu_init(vcpu, kvm, id);
	if (err)
		goto free_vcpu;

	err = kvmppc_e500_tlb_init(vcpu_e500);
	if (err)
		goto uninit_vcpu;

	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
	if (!vcpu->arch.shared)
		goto uninit_tlb;

	return vcpu;

uninit_tlb:
	kvmppc_e500_tlb_uninit(vcpu_e500);
uninit_vcpu:
	kvm_vcpu_uninit(vcpu);

free_vcpu:
	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
out:
	return ERR_PTR(err);
}

static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);

	free_page((unsigned long)vcpu->arch.shared);
	kvmppc_e500_tlb_uninit(vcpu_e500);
	kvm_vcpu_uninit(vcpu);
	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
}

static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
{
	int lpid;

	lpid = kvmppc_alloc_lpid();
	if (lpid < 0)
		return lpid;

	/*
	 * Use two lpids per VM on cores with two threads like e6500. Use
	 * even numbers to speedup vcpu lpid computation with consecutive lpids
	 * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
	 */
	if (threads_per_core == 2)
		lpid <<= 1;

	kvm->arch.lpid = lpid;
	return 0;
}

static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
{
	int lpid = kvm->arch.lpid;

	if (threads_per_core == 2)
		lpid >>= 1;

	kvmppc_free_lpid(lpid);
}

static struct kvmppc_ops kvm_ops_e500mc = {
	.get_sregs = kvmppc_core_get_sregs_e500mc,
	.set_sregs = kvmppc_core_set_sregs_e500mc,
	.get_one_reg = kvmppc_get_one_reg_e500mc,
	.set_one_reg = kvmppc_set_one_reg_e500mc,
	.vcpu_load   = kvmppc_core_vcpu_load_e500mc,
	.vcpu_put    = kvmppc_core_vcpu_put_e500mc,
	.vcpu_create = kvmppc_core_vcpu_create_e500mc,
	.vcpu_free   = kvmppc_core_vcpu_free_e500mc,
	.mmu_destroy  = kvmppc_mmu_destroy_e500,
	.init_vm = kvmppc_core_init_vm_e500mc,
	.destroy_vm = kvmppc_core_destroy_vm_e500mc,
	.emulate_op = kvmppc_core_emulate_op_e500,
	.emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
	.emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
};

static int __init kvmppc_e500mc_init(void)
{
	int r;

	r = kvmppc_booke_init();
	if (r)
		goto err_out;

	/*
	 * Use two lpids per VM on dual threaded processors like e6500
	 * to workarround the lack of tlb write conditional instruction.
	 * Expose half the number of available hardware lpids to the lpid
	 * allocator.
	 */
	kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
	kvmppc_claim_lpid(0); /* host */

	r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
	if (r)
		goto err_out;
	kvm_ops_e500mc.owner = THIS_MODULE;
	kvmppc_pr_ops = &kvm_ops_e500mc;

err_out:
	return r;
}

static void __exit kvmppc_e500mc_exit(void)
{
	kvmppc_pr_ops = NULL;
	kvmppc_booke_exit();
}

module_init(kvmppc_e500mc_init);
module_exit(kvmppc_e500mc_exit);
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");
OpenPOWER on IntegriCloud