2 * Copyright (C) 2001 MandrakeSoft S.A.
7 * http://www.linux-mandrake.com/
8 * http://www.mandrakesoft.com/
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.
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.
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
24 * Yunhong Jiang <yunhong.jiang@intel.com>
25 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
26 * Based on Xen 3.1 code.
29 #include <linux/kvm_host.h>
30 #include <linux/kvm.h>
32 #include <linux/highmem.h>
33 #include <linux/smp.h>
34 #include <linux/hrtimer.h>
36 #include <asm/processor.h>
38 #include <asm/current.h>
45 #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
47 #define ioapic_debug(fmt, arg...)
49 static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
51 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
55 unsigned long result = 0;
57 switch (ioapic->ioregsel) {
58 case IOAPIC_REG_VERSION:
59 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
60 | (IOAPIC_VERSION_ID & 0xff));
63 case IOAPIC_REG_APIC_ID:
64 case IOAPIC_REG_ARB_ID:
65 result = ((ioapic->id & 0xf) << 24);
70 u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
73 ASSERT(redir_index < IOAPIC_NUM_PINS);
75 redir_content = ioapic->redirtbl[redir_index].bits;
76 result = (ioapic->ioregsel & 0x1) ?
77 (redir_content >> 32) & 0xffffffff :
78 redir_content & 0xffffffff;
86 static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
88 union kvm_ioapic_redirect_entry *pent;
91 pent = &ioapic->redirtbl[idx];
93 if (!pent->fields.mask) {
94 injected = ioapic_deliver(ioapic, idx);
95 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
96 pent->fields.remote_irr = 1;
102 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
105 bool mask_before, mask_after;
107 switch (ioapic->ioregsel) {
108 case IOAPIC_REG_VERSION:
109 /* Writes are ignored. */
112 case IOAPIC_REG_APIC_ID:
113 ioapic->id = (val >> 24) & 0xf;
116 case IOAPIC_REG_ARB_ID:
120 index = (ioapic->ioregsel - 0x10) >> 1;
122 ioapic_debug("change redir index %x val %x\n", index, val);
123 if (index >= IOAPIC_NUM_PINS)
125 mask_before = ioapic->redirtbl[index].fields.mask;
126 if (ioapic->ioregsel & 1) {
127 ioapic->redirtbl[index].bits &= 0xffffffff;
128 ioapic->redirtbl[index].bits |= (u64) val << 32;
130 ioapic->redirtbl[index].bits &= ~0xffffffffULL;
131 ioapic->redirtbl[index].bits |= (u32) val;
132 ioapic->redirtbl[index].fields.remote_irr = 0;
134 mask_after = ioapic->redirtbl[index].fields.mask;
135 if (mask_before != mask_after)
136 kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
137 if (ioapic->redirtbl[index].fields.trig_mode == IOAPIC_LEVEL_TRIG
138 && ioapic->irr & (1 << index))
139 ioapic_service(ioapic, index);
144 static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
146 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
147 struct kvm_lapic_irq irqe;
149 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
150 "vector=%x trig_mode=%x\n",
151 entry->fields.dest, entry->fields.dest_mode,
152 entry->fields.delivery_mode, entry->fields.vector,
153 entry->fields.trig_mode);
155 irqe.dest_id = entry->fields.dest_id;
156 irqe.vector = entry->fields.vector;
157 irqe.dest_mode = entry->fields.dest_mode;
158 irqe.trig_mode = entry->fields.trig_mode;
159 irqe.delivery_mode = entry->fields.delivery_mode << 8;
164 /* Always delivery PIT interrupt to vcpu 0 */
166 irqe.dest_mode = 0; /* Physical mode. */
167 /* need to read apic_id from apic regiest since
168 * it can be rewritten */
169 irqe.dest_id = ioapic->kvm->bsp_vcpu->vcpu_id;
172 return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
175 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
177 u32 old_irr = ioapic->irr;
179 union kvm_ioapic_redirect_entry entry;
182 if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
183 entry = ioapic->redirtbl[irq];
184 level ^= entry.fields.polarity;
186 ioapic->irr &= ~mask;
188 int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
190 if ((edge && old_irr != ioapic->irr) ||
191 (!edge && !entry.fields.remote_irr))
192 ret = ioapic_service(ioapic, irq);
198 static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin,
201 union kvm_ioapic_redirect_entry *ent;
203 ent = &ioapic->redirtbl[pin];
205 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, pin);
207 if (trigger_mode == IOAPIC_LEVEL_TRIG) {
208 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
209 ent->fields.remote_irr = 0;
210 if (!ent->fields.mask && (ioapic->irr & (1 << pin)))
211 ioapic_service(ioapic, pin);
215 void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
217 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
220 for (i = 0; i < IOAPIC_NUM_PINS; i++)
221 if (ioapic->redirtbl[i].fields.vector == vector)
222 __kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
225 static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
227 return container_of(dev, struct kvm_ioapic, dev);
230 static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
231 int len, int is_write)
233 struct kvm_ioapic *ioapic = to_ioapic(this);
235 return ((addr >= ioapic->base_address &&
236 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
239 static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
242 struct kvm_ioapic *ioapic = to_ioapic(this);
245 ioapic_debug("addr %lx\n", (unsigned long)addr);
246 ASSERT(!(addr & 0xf)); /* check alignment */
248 mutex_lock(&ioapic->kvm->irq_lock);
251 case IOAPIC_REG_SELECT:
252 result = ioapic->ioregsel;
255 case IOAPIC_REG_WINDOW:
256 result = ioapic_read_indirect(ioapic, addr, len);
265 *(u64 *) val = result;
270 memcpy(val, (char *)&result, len);
273 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
275 mutex_unlock(&ioapic->kvm->irq_lock);
278 static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
281 struct kvm_ioapic *ioapic = to_ioapic(this);
284 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
285 (void*)addr, len, val);
286 ASSERT(!(addr & 0xf)); /* check alignment */
288 mutex_lock(&ioapic->kvm->irq_lock);
289 if (len == 4 || len == 8)
292 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
298 case IOAPIC_REG_SELECT:
299 ioapic->ioregsel = data;
302 case IOAPIC_REG_WINDOW:
303 ioapic_write_indirect(ioapic, data);
307 kvm_ioapic_update_eoi(ioapic->kvm, data, IOAPIC_LEVEL_TRIG);
314 mutex_unlock(&ioapic->kvm->irq_lock);
317 void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
321 for (i = 0; i < IOAPIC_NUM_PINS; i++)
322 ioapic->redirtbl[i].fields.mask = 1;
323 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
324 ioapic->ioregsel = 0;
329 static const struct kvm_io_device_ops ioapic_mmio_ops = {
330 .read = ioapic_mmio_read,
331 .write = ioapic_mmio_write,
332 .in_range = ioapic_in_range,
335 int kvm_ioapic_init(struct kvm *kvm)
337 struct kvm_ioapic *ioapic;
339 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
342 kvm->arch.vioapic = ioapic;
343 kvm_ioapic_reset(ioapic);
344 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
346 kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);