summaryrefslogtreecommitdiff
path: root/virt/kvm/ioapic.c
blob: 883fd0dc9b78600950e1f333bf66f11187a5d1a2 (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
/*
 *  Copyright (C) 2001  MandrakeSoft S.A.
 *
 *    MandrakeSoft S.A.
 *    43, rue d'Aboukir
 *    75002 Paris - France
 *    http://www.linux-mandrake.com/
 *    http://www.mandrakesoft.com/
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *  Yunhong Jiang <yunhong.jiang@intel.com>
 *  Yaozu (Eddie) Dong <eddie.dong@intel.com>
 *  Based on Xen 3.1 code.
 */

#include <linux/kvm_host.h>
#include <linux/kvm.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/smp.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/current.h>

#include "ioapic.h"
#include "lapic.h"
#include "irq.h"

#if 0
#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
#else
#define ioapic_debug(fmt, arg...)
#endif
static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);

static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
					  unsigned long addr,
					  unsigned long length)
{
	unsigned long result = 0;

	switch (ioapic->ioregsel) {
	case IOAPIC_REG_VERSION:
		result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
			  | (IOAPIC_VERSION_ID & 0xff));
		break;

	case IOAPIC_REG_APIC_ID:
	case IOAPIC_REG_ARB_ID:
		result = ((ioapic->id & 0xf) << 24);
		break;

	default:
		{
			u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
			u64 redir_content;

			ASSERT(redir_index < IOAPIC_NUM_PINS);

			redir_content = ioapic->redirtbl[redir_index].bits;
			result = (ioapic->ioregsel & 0x1) ?
			    (redir_content >> 32) & 0xffffffff :
			    redir_content & 0xffffffff;
			break;
		}
	}

	return result;
}

static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
{
	union kvm_ioapic_redirect_entry *pent;
	int injected = -1;

	pent = &ioapic->redirtbl[idx];

	if (!pent->fields.mask) {
		injected = ioapic_deliver(ioapic, idx);
		if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
			pent->fields.remote_irr = 1;
	}
	if (!pent->fields.trig_mode)
		ioapic->irr &= ~(1 << idx);

	return injected;
}

static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
{
	unsigned index;
	bool mask_before, mask_after;

	switch (ioapic->ioregsel) {
	case IOAPIC_REG_VERSION:
		/* Writes are ignored. */
		break;

	case IOAPIC_REG_APIC_ID:
		ioapic->id = (val >> 24) & 0xf;
		break;

	case IOAPIC_REG_ARB_ID:
		break;

	default:
		index = (ioapic->ioregsel - 0x10) >> 1;

		ioapic_debug("change redir index %x val %x\n", index, val);
		if (index >= IOAPIC_NUM_PINS)
			return;
		mask_before = ioapic->redirtbl[index].fields.mask;
		if (ioapic->ioregsel & 1) {
			ioapic->redirtbl[index].bits &= 0xffffffff;
			ioapic->redirtbl[index].bits |= (u64) val << 32;
		} else {
			ioapic->redirtbl[index].bits &= ~0xffffffffULL;
			ioapic->redirtbl[index].bits |= (u32) val;
			ioapic->redirtbl[index].fields.remote_irr = 0;
		}
		mask_after = ioapic->redirtbl[index].fields.mask;
		if (mask_before != mask_after)
			kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
		if (ioapic->irr & (1 << index))
			ioapic_service(ioapic, index);
		break;
	}
}

static int ioapic_inj_irq(struct kvm_ioapic *ioapic,
			   struct kvm_vcpu *vcpu,
			   u8 vector, u8 trig_mode, u8 delivery_mode)
{
	ioapic_debug("irq %d trig %d deliv %d\n", vector, trig_mode,
		     delivery_mode);

	ASSERT((delivery_mode == IOAPIC_FIXED) ||
	       (delivery_mode == IOAPIC_LOWEST_PRIORITY));

	return kvm_apic_set_irq(vcpu, vector, trig_mode);
}

static void ioapic_inj_nmi(struct kvm_vcpu *vcpu)
{
	kvm_inject_nmi(vcpu);
	kvm_vcpu_kick(vcpu);
}

u32 kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
				    u8 dest_mode)
{
	u32 mask = 0;
	int i;
	struct kvm *kvm = ioapic->kvm;
	struct kvm_vcpu *vcpu;

	ioapic_debug("dest %d dest_mode %d\n", dest, dest_mode);

	if (dest_mode == 0) {	/* Physical mode. */
		if (dest == 0xFF) {	/* Broadcast. */
			for (i = 0; i < KVM_MAX_VCPUS; ++i)
				if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
					mask |= 1 << i;
			return mask;
		}
		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
			vcpu = kvm->vcpus[i];
			if (!vcpu)
				continue;
			if (kvm_apic_match_physical_addr(vcpu->arch.apic, dest)) {
				if (vcpu->arch.apic)
					mask = 1 << i;
				break;
			}
		}
	} else if (dest != 0)	/* Logical mode, MDA non-zero. */
		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
			vcpu = kvm->vcpus[i];
			if (!vcpu)
				continue;
			if (vcpu->arch.apic &&
			    kvm_apic_match_logical_addr(vcpu->arch.apic, dest))
				mask |= 1 << vcpu->vcpu_id;
		}
	ioapic_debug("mask %x\n", mask);
	return mask;
}

static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
{
	union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
	unsigned long deliver_bitmask;
	struct kvm_vcpu *vcpu;
	int vcpu_id, r = -1;

	ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
		     "vector=%x trig_mode=%x\n",
		     entry.fields.dest, entry.fields.dest_mode,
		     entry.fields.delivery_mode, entry.fields.vector,
		     entry.fields.trig_mode);

	kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
	if (!deliver_bitmask) {
		ioapic_debug("no target on destination\n");
		return 0;
	}

	/* Always delivery PIT interrupt to vcpu 0 */
#ifdef CONFIG_X86
	if (irq == 0)
		deliver_bitmask = 1;
#endif

	for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
		if (!(deliver_bitmask & (1 << vcpu_id)))
			continue;
		deliver_bitmask &= ~(1 << vcpu_id);
		vcpu = ioapic->kvm->vcpus[vcpu_id];
		if (vcpu) {
			if (entry.fields.delivery_mode ==
					IOAPIC_LOWEST_PRIORITY ||
			    entry.fields.delivery_mode == IOAPIC_FIXED) {
				if (r < 0)
					r = 0;
				r += ioapic_inj_irq(ioapic, vcpu,
						    entry.fields.vector,
						    entry.fields.trig_mode,
						    entry.fields.delivery_mode);
			} else if (entry.fields.delivery_mode == IOAPIC_NMI) {
				r = 1;
				ioapic_inj_nmi(vcpu);
			} else
				ioapic_debug("unsupported delivery mode %x!\n",
					     entry.fields.delivery_mode);
		} else
			ioapic_debug("null destination vcpu: "
				     "mask=%x vector=%x delivery_mode=%x\n",
				     entry.fields.deliver_bitmask,
				     entry.fields.vector,
				     entry.fields.delivery_mode);
	}
	return r;
}

int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
{
	u32 old_irr = ioapic->irr;
	u32 mask = 1 << irq;
	union kvm_ioapic_redirect_entry entry;
	int ret = 1;

	if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
		entry = ioapic->redirtbl[irq];
		level ^= entry.fields.polarity;
		if (!level)
			ioapic->irr &= ~mask;
		else {
			ioapic->irr |= mask;
			if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
			    || !entry.fields.remote_irr)
				ret = ioapic_service(ioapic, irq);
		}
	}
	return ret;
}

static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin,
				    int trigger_mode)
{
	union kvm_ioapic_redirect_entry *ent;

	ent = &ioapic->redirtbl[pin];

	kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, pin);

	if (trigger_mode == IOAPIC_LEVEL_TRIG) {
		ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
		ent->fields.remote_irr = 0;
		if (!ent->fields.mask && (ioapic->irr & (1 << pin)))
			ioapic_service(ioapic, pin);
	}
}

void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
{
	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
	int i;

	for (i = 0; i < IOAPIC_NUM_PINS; i++)
		if (ioapic->redirtbl[i].fields.vector == vector)
			__kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
}

static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
			   int len, int is_write)
{
	struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;

	return ((addr >= ioapic->base_address &&
		 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
}

static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
			     void *val)
{
	struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
	u32 result;

	ioapic_debug("addr %lx\n", (unsigned long)addr);
	ASSERT(!(addr & 0xf));	/* check alignment */

	addr &= 0xff;
	switch (addr) {
	case IOAPIC_REG_SELECT:
		result = ioapic->ioregsel;
		break;

	case IOAPIC_REG_WINDOW:
		result = ioapic_read_indirect(ioapic, addr, len);
		break;

	default:
		result = 0;
		break;
	}
	switch (len) {
	case 8:
		*(u64 *) val = result;
		break;
	case 1:
	case 2:
	case 4:
		memcpy(val, (char *)&result, len);
		break;
	default:
		printk(KERN_WARNING "ioapic: wrong length %d\n", len);
	}
}

static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
			      const void *val)
{
	struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
	u32 data;

	ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
		     (void*)addr, len, val);
	ASSERT(!(addr & 0xf));	/* check alignment */
	if (len == 4 || len == 8)
		data = *(u32 *) val;
	else {
		printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
		return;
	}

	addr &= 0xff;
	switch (addr) {
	case IOAPIC_REG_SELECT:
		ioapic->ioregsel = data;
		break;

	case IOAPIC_REG_WINDOW:
		ioapic_write_indirect(ioapic, data);
		break;
#ifdef	CONFIG_IA64
	case IOAPIC_REG_EOI:
		kvm_ioapic_update_eoi(ioapic->kvm, data, IOAPIC_LEVEL_TRIG);
		break;
#endif

	default:
		break;
	}
}

void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
{
	int i;

	for (i = 0; i < IOAPIC_NUM_PINS; i++)
		ioapic->redirtbl[i].fields.mask = 1;
	ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
	ioapic->ioregsel = 0;
	ioapic->irr = 0;
	ioapic->id = 0;
}

int kvm_ioapic_init(struct kvm *kvm)
{
	struct kvm_ioapic *ioapic;

	ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
	if (!ioapic)
		return -ENOMEM;
	kvm->arch.vioapic = ioapic;
	kvm_ioapic_reset(ioapic);
	ioapic->dev.read = ioapic_mmio_read;
	ioapic->dev.write = ioapic_mmio_write;
	ioapic->dev.in_range = ioapic_in_range;
	ioapic->dev.private = ioapic;
	ioapic->kvm = kvm;
	kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
	return 0;
}