tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright (C) 2001 MandrakeSoft S.A.
3 *
4 * MandrakeSoft S.A.
5 * 43, rue d'Aboukir
6 * 75002 Paris - France
7 * http://www.linux-mandrake.com/
8 * http://www.mandrakesoft.com/
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Yunhong Jiang <yunhong.jiang@intel.com>
25 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
26 * Based on Xen 3.1 code.
27 */
28
29#include <linux/kvm_host.h>
30#include <linux/kvm.h>
31#include <linux/mm.h>
32#include <linux/highmem.h>
33#include <linux/smp.h>
34#include <linux/hrtimer.h>
35#include <linux/io.h>
36#include <asm/processor.h>
37#include <asm/page.h>
38#include <asm/current.h>
39
40#include "ioapic.h"
41#include "lapic.h"
42
43#if 0
44#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
45#else
46#define ioapic_debug(fmt, arg...)
47#endif
48static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
49
50static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
51 unsigned long addr,
52 unsigned long length)
53{
54 unsigned long result = 0;
55
56 switch (ioapic->ioregsel) {
57 case IOAPIC_REG_VERSION:
58 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
59 | (IOAPIC_VERSION_ID & 0xff));
60 break;
61
62 case IOAPIC_REG_APIC_ID:
63 case IOAPIC_REG_ARB_ID:
64 result = ((ioapic->id & 0xf) << 24);
65 break;
66
67 default:
68 {
69 u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
70 u64 redir_content;
71
72 ASSERT(redir_index < IOAPIC_NUM_PINS);
73
74 redir_content = ioapic->redirtbl[redir_index].bits;
75 result = (ioapic->ioregsel & 0x1) ?
76 (redir_content >> 32) & 0xffffffff :
77 redir_content & 0xffffffff;
78 break;
79 }
80 }
81
82 return result;
83}
84
85static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
86{
87 union ioapic_redir_entry *pent;
88
89 pent = &ioapic->redirtbl[idx];
90
91 if (!pent->fields.mask) {
92 int injected = ioapic_deliver(ioapic, idx);
93 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
94 pent->fields.remote_irr = 1;
95 }
96 if (!pent->fields.trig_mode)
97 ioapic->irr &= ~(1 << idx);
98}
99
100static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
101{
102 unsigned index;
103
104 switch (ioapic->ioregsel) {
105 case IOAPIC_REG_VERSION:
106 /* Writes are ignored. */
107 break;
108
109 case IOAPIC_REG_APIC_ID:
110 ioapic->id = (val >> 24) & 0xf;
111 break;
112
113 case IOAPIC_REG_ARB_ID:
114 break;
115
116 default:
117 index = (ioapic->ioregsel - 0x10) >> 1;
118
119 ioapic_debug("change redir index %x val %x\n", index, val);
120 if (index >= IOAPIC_NUM_PINS)
121 return;
122 if (ioapic->ioregsel & 1) {
123 ioapic->redirtbl[index].bits &= 0xffffffff;
124 ioapic->redirtbl[index].bits |= (u64) val << 32;
125 } else {
126 ioapic->redirtbl[index].bits &= ~0xffffffffULL;
127 ioapic->redirtbl[index].bits |= (u32) val;
128 ioapic->redirtbl[index].fields.remote_irr = 0;
129 }
130 if (ioapic->irr & (1 << index))
131 ioapic_service(ioapic, index);
132 break;
133 }
134}
135
136static int ioapic_inj_irq(struct kvm_ioapic *ioapic,
137 struct kvm_vcpu *vcpu,
138 u8 vector, u8 trig_mode, u8 delivery_mode)
139{
140 ioapic_debug("irq %d trig %d deliv %d\n", vector, trig_mode,
141 delivery_mode);
142
143 ASSERT((delivery_mode == IOAPIC_FIXED) ||
144 (delivery_mode == IOAPIC_LOWEST_PRIORITY));
145
146 return kvm_apic_set_irq(vcpu, vector, trig_mode);
147}
148
149static void ioapic_inj_nmi(struct kvm_vcpu *vcpu)
150{
151 kvm_inject_nmi(vcpu);
152}
153
154static u32 ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
155 u8 dest_mode)
156{
157 u32 mask = 0;
158 int i;
159 struct kvm *kvm = ioapic->kvm;
160 struct kvm_vcpu *vcpu;
161
162 ioapic_debug("dest %d dest_mode %d\n", dest, dest_mode);
163
164 if (dest_mode == 0) { /* Physical mode. */
165 if (dest == 0xFF) { /* Broadcast. */
166 for (i = 0; i < KVM_MAX_VCPUS; ++i)
167 if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
168 mask |= 1 << i;
169 return mask;
170 }
171 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
172 vcpu = kvm->vcpus[i];
173 if (!vcpu)
174 continue;
175 if (kvm_apic_match_physical_addr(vcpu->arch.apic, dest)) {
176 if (vcpu->arch.apic)
177 mask = 1 << i;
178 break;
179 }
180 }
181 } else if (dest != 0) /* Logical mode, MDA non-zero. */
182 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
183 vcpu = kvm->vcpus[i];
184 if (!vcpu)
185 continue;
186 if (vcpu->arch.apic &&
187 kvm_apic_match_logical_addr(vcpu->arch.apic, dest))
188 mask |= 1 << vcpu->vcpu_id;
189 }
190 ioapic_debug("mask %x\n", mask);
191 return mask;
192}
193
194static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
195{
196 u8 dest = ioapic->redirtbl[irq].fields.dest_id;
197 u8 dest_mode = ioapic->redirtbl[irq].fields.dest_mode;
198 u8 delivery_mode = ioapic->redirtbl[irq].fields.delivery_mode;
199 u8 vector = ioapic->redirtbl[irq].fields.vector;
200 u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
201 u32 deliver_bitmask;
202 struct kvm_vcpu *vcpu;
203 int vcpu_id, r = 0;
204
205 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
206 "vector=%x trig_mode=%x\n",
207 dest, dest_mode, delivery_mode, vector, trig_mode);
208
209 deliver_bitmask = ioapic_get_delivery_bitmask(ioapic, dest, dest_mode);
210 if (!deliver_bitmask) {
211 ioapic_debug("no target on destination\n");
212 return 0;
213 }
214
215 switch (delivery_mode) {
216 case IOAPIC_LOWEST_PRIORITY:
217 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
218 deliver_bitmask);
219#ifdef CONFIG_X86
220 if (irq == 0)
221 vcpu = ioapic->kvm->vcpus[0];
222#endif
223 if (vcpu != NULL)
224 r = ioapic_inj_irq(ioapic, vcpu, vector,
225 trig_mode, delivery_mode);
226 else
227 ioapic_debug("null lowest prio vcpu: "
228 "mask=%x vector=%x delivery_mode=%x\n",
229 deliver_bitmask, vector, IOAPIC_LOWEST_PRIORITY);
230 break;
231 case IOAPIC_FIXED:
232#ifdef CONFIG_X86
233 if (irq == 0)
234 deliver_bitmask = 1;
235#endif
236 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
237 if (!(deliver_bitmask & (1 << vcpu_id)))
238 continue;
239 deliver_bitmask &= ~(1 << vcpu_id);
240 vcpu = ioapic->kvm->vcpus[vcpu_id];
241 if (vcpu) {
242 r = ioapic_inj_irq(ioapic, vcpu, vector,
243 trig_mode, delivery_mode);
244 }
245 }
246 break;
247 case IOAPIC_NMI:
248 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
249 if (!(deliver_bitmask & (1 << vcpu_id)))
250 continue;
251 deliver_bitmask &= ~(1 << vcpu_id);
252 vcpu = ioapic->kvm->vcpus[vcpu_id];
253 if (vcpu)
254 ioapic_inj_nmi(vcpu);
255 else
256 ioapic_debug("NMI to vcpu %d failed\n",
257 vcpu->vcpu_id);
258 }
259 break;
260 default:
261 printk(KERN_WARNING "Unsupported delivery mode %d\n",
262 delivery_mode);
263 break;
264 }
265 return r;
266}
267
268void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
269{
270 u32 old_irr = ioapic->irr;
271 u32 mask = 1 << irq;
272 union ioapic_redir_entry entry;
273
274 if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
275 entry = ioapic->redirtbl[irq];
276 level ^= entry.fields.polarity;
277 if (!level)
278 ioapic->irr &= ~mask;
279 else {
280 ioapic->irr |= mask;
281 if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
282 || !entry.fields.remote_irr)
283 ioapic_service(ioapic, irq);
284 }
285 }
286}
287
288static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int gsi)
289{
290 union ioapic_redir_entry *ent;
291
292 ent = &ioapic->redirtbl[gsi];
293 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
294
295 ent->fields.remote_irr = 0;
296 if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
297 ioapic_service(ioapic, gsi);
298}
299
300void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
301{
302 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
303 int i;
304
305 for (i = 0; i < IOAPIC_NUM_PINS; i++)
306 if (ioapic->redirtbl[i].fields.vector == vector)
307 __kvm_ioapic_update_eoi(ioapic, i);
308}
309
310static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
311 int len, int is_write)
312{
313 struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
314
315 return ((addr >= ioapic->base_address &&
316 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
317}
318
319static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
320 void *val)
321{
322 struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
323 u32 result;
324
325 ioapic_debug("addr %lx\n", (unsigned long)addr);
326 ASSERT(!(addr & 0xf)); /* check alignment */
327
328 addr &= 0xff;
329 switch (addr) {
330 case IOAPIC_REG_SELECT:
331 result = ioapic->ioregsel;
332 break;
333
334 case IOAPIC_REG_WINDOW:
335 result = ioapic_read_indirect(ioapic, addr, len);
336 break;
337
338 default:
339 result = 0;
340 break;
341 }
342 switch (len) {
343 case 8:
344 *(u64 *) val = result;
345 break;
346 case 1:
347 case 2:
348 case 4:
349 memcpy(val, (char *)&result, len);
350 break;
351 default:
352 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
353 }
354}
355
356static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
357 const void *val)
358{
359 struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
360 u32 data;
361
362 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
363 (void*)addr, len, val);
364 ASSERT(!(addr & 0xf)); /* check alignment */
365 if (len == 4 || len == 8)
366 data = *(u32 *) val;
367 else {
368 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
369 return;
370 }
371
372 addr &= 0xff;
373 switch (addr) {
374 case IOAPIC_REG_SELECT:
375 ioapic->ioregsel = data;
376 break;
377
378 case IOAPIC_REG_WINDOW:
379 ioapic_write_indirect(ioapic, data);
380 break;
381#ifdef CONFIG_IA64
382 case IOAPIC_REG_EOI:
383 kvm_ioapic_update_eoi(ioapic->kvm, data);
384 break;
385#endif
386
387 default:
388 break;
389 }
390}
391
392void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
393{
394 int i;
395
396 for (i = 0; i < IOAPIC_NUM_PINS; i++)
397 ioapic->redirtbl[i].fields.mask = 1;
398 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
399 ioapic->ioregsel = 0;
400 ioapic->irr = 0;
401 ioapic->id = 0;
402}
403
404int kvm_ioapic_init(struct kvm *kvm)
405{
406 struct kvm_ioapic *ioapic;
407
408 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
409 if (!ioapic)
410 return -ENOMEM;
411 kvm->arch.vioapic = ioapic;
412 kvm_ioapic_reset(ioapic);
413 ioapic->dev.read = ioapic_mmio_read;
414 ioapic->dev.write = ioapic_mmio_write;
415 ioapic->dev.in_range = ioapic_in_range;
416 ioapic->dev.private = ioapic;
417 ioapic->kvm = kvm;
418 kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
419 return 0;
420}