blob: 656fa455e154abedceba3883cf865adfa73f873b [file] [log] [blame]
Xiantao Zhang3de42dc2008-10-06 13:48:45 +08001/*
2 * irq_comm.c: Common API for in kernel interrupt controller
3 * Copyright (c) 2007, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
17 * Authors:
18 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
19 *
Nicolas Kaiser9611c182010-10-06 14:23:22 +020020 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
Xiantao Zhang3de42dc2008-10-06 13:48:45 +080021 */
22
23#include <linux/kvm_host.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Marcelo Tosatti229456f2009-06-17 09:22:14 -030025#include <trace/events/kvm.h>
Sheng Yang79950e12009-02-10 13:57:06 +080026
Sheng Yang79950e12009-02-10 13:57:06 +080027#include <asm/msidef.h>
Gleb Natapov58c2dde2009-03-05 16:35:04 +020028#ifdef CONFIG_IA64
29#include <asm/iosapic.h>
30#endif
Sheng Yang79950e12009-02-10 13:57:06 +080031
Xiantao Zhang3de42dc2008-10-06 13:48:45 +080032#include "irq.h"
33
34#include "ioapic.h"
35
Gleb Natapov49256632009-02-04 17:28:14 +020036static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
Gleb Natapov1a6e4a82009-08-24 11:54:19 +030037 struct kvm *kvm, int irq_source_id, int level)
Avi Kivity399ec802008-11-19 13:58:46 +020038{
39#ifdef CONFIG_X86
Gleb Natapov1a6e4a82009-08-24 11:54:19 +030040 struct kvm_pic *pic = pic_irqchip(kvm);
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +030041 return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
Gleb Natapov49256632009-02-04 17:28:14 +020042#else
43 return -1;
Avi Kivity399ec802008-11-19 13:58:46 +020044#endif
45}
46
Gleb Natapov49256632009-02-04 17:28:14 +020047static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
Gleb Natapov1a6e4a82009-08-24 11:54:19 +030048 struct kvm *kvm, int irq_source_id, int level)
Avi Kivity399ec802008-11-19 13:58:46 +020049{
Gleb Natapov1a6e4a82009-08-24 11:54:19 +030050 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +030051 return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level);
Avi Kivity399ec802008-11-19 13:58:46 +020052}
53
Gleb Natapov58c2dde2009-03-05 16:35:04 +020054inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
Sheng Yang116191b2009-02-11 16:03:37 +080055{
Gleb Natapov58c2dde2009-03-05 16:35:04 +020056#ifdef CONFIG_IA64
57 return irq->delivery_mode ==
58 (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
59#else
60 return irq->delivery_mode == APIC_DM_LOWEST;
61#endif
62}
Sheng Yang116191b2009-02-11 16:03:37 +080063
Gleb Natapov58c2dde2009-03-05 16:35:04 +020064int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
65 struct kvm_lapic_irq *irq)
66{
67 int i, r = -1;
68 struct kvm_vcpu *vcpu, *lowest = NULL;
69
70 if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
Gleb Natapov1e08ec42012-09-13 17:19:24 +030071 kvm_is_dm_lowest_prio(irq)) {
Gleb Natapov343f94f2009-03-05 16:34:54 +020072 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
Gleb Natapov1e08ec42012-09-13 17:19:24 +030073 irq->delivery_mode = APIC_DM_FIXED;
74 }
75
76 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r))
77 return r;
Gleb Natapov343f94f2009-03-05 16:34:54 +020078
Gleb Natapov988a2ca2009-06-09 15:56:29 +030079 kvm_for_each_vcpu(i, vcpu, kvm) {
80 if (!kvm_apic_present(vcpu))
Gleb Natapov343f94f2009-03-05 16:34:54 +020081 continue;
Sheng Yang74a3a8f2009-03-04 13:33:02 +080082
Gleb Natapov58c2dde2009-03-05 16:35:04 +020083 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
84 irq->dest_id, irq->dest_mode))
Gleb Natapov343f94f2009-03-05 16:34:54 +020085 continue;
86
Gleb Natapov58c2dde2009-03-05 16:35:04 +020087 if (!kvm_is_dm_lowest_prio(irq)) {
88 if (r < 0)
89 r = 0;
90 r += kvm_apic_set_irq(vcpu, irq);
Chris Lalancetteaefd18f2010-06-16 17:11:13 -040091 } else if (kvm_lapic_enabled(vcpu)) {
Gleb Natapov58c2dde2009-03-05 16:35:04 +020092 if (!lowest)
93 lowest = vcpu;
94 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
95 lowest = vcpu;
Gleb Natapove1035712009-03-05 16:34:59 +020096 }
Gleb Natapov343f94f2009-03-05 16:34:54 +020097 }
98
Gleb Natapov58c2dde2009-03-05 16:35:04 +020099 if (lowest)
100 r = kvm_apic_set_irq(lowest, irq);
101
102 return r;
Sheng Yang116191b2009-02-11 16:03:37 +0800103}
104
Michael S. Tsirkin01f21882012-10-17 18:06:02 +0200105static inline void kvm_set_msi_irq(struct kvm_kernel_irq_routing_entry *e,
106 struct kvm_lapic_irq *irq)
107{
108 trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
109
110 irq->dest_id = (e->msi.address_lo &
111 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
112 irq->vector = (e->msi.data &
113 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
114 irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
115 irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
116 irq->delivery_mode = e->msi.data & 0x700;
117 irq->level = 1;
118 irq->shorthand = 0;
119 /* TODO Deal with RH bit of MSI message address */
120}
121
Michael S. Tsirkinbd2b53b2010-11-18 19:09:08 +0200122int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
123 struct kvm *kvm, int irq_source_id, int level)
Sheng Yang79950e12009-02-10 13:57:06 +0800124{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200125 struct kvm_lapic_irq irq;
Sheng Yang79950e12009-02-10 13:57:06 +0800126
Gleb Natapov1a6e4a82009-08-24 11:54:19 +0300127 if (!level)
128 return -1;
129
Michael S. Tsirkin01f21882012-10-17 18:06:02 +0200130 kvm_set_msi_irq(e, &irq);
Gleb Natapov1000ff82009-07-07 16:00:57 +0300131
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200132 return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
Sheng Yang79950e12009-02-10 13:57:06 +0800133}
134
Michael S. Tsirkin01f21882012-10-17 18:06:02 +0200135
136static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e,
137 struct kvm *kvm)
138{
139 struct kvm_lapic_irq irq;
140 int r;
141
142 kvm_set_msi_irq(e, &irq);
143
144 if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r))
145 return r;
146 else
147 return -EWOULDBLOCK;
148}
149
Jan Kiszka07975ad2012-03-29 21:14:12 +0200150int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
151{
152 struct kvm_kernel_irq_routing_entry route;
153
154 if (!irqchip_in_kernel(kvm) || msi->flags != 0)
155 return -EINVAL;
156
157 route.msi.address_lo = msi->address_lo;
158 route.msi.address_hi = msi->address_hi;
159 route.msi.data = msi->data;
160
161 return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
162}
163
Gleb Natapov680b3642009-08-24 11:54:26 +0300164/*
Gleb Natapov49256632009-02-04 17:28:14 +0200165 * Return value:
166 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
167 * = 0 Interrupt was coalesced (previous irq is still pending)
168 * > 0 Number of CPUs interrupt was delivered to
169 */
Gleb Natapov46e624b2009-08-24 11:54:20 +0300170int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800171{
Gleb Natapoveba02262009-08-24 11:54:25 +0300172 struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
173 int ret = -1, i = 0;
Gleb Natapov46e624b2009-08-24 11:54:20 +0300174 struct kvm_irq_routing_table *irq_rt;
175 struct hlist_node *n;
Sheng Yang5550af42008-10-15 20:15:06 +0800176
Avi Kivityae8c1c42009-07-01 12:09:41 +0300177 trace_kvm_set_irq(irq, level, irq_source_id);
Marcelo Tosatti229456f2009-06-17 09:22:14 -0300178
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800179 /* Not possible to detect if the guest uses the PIC or the
180 * IOAPIC. So set the bit in both. The guest will ignore
181 * writes to the unused one.
182 */
Gleb Natapove42bba92009-08-24 11:54:22 +0300183 rcu_read_lock();
184 irq_rt = rcu_dereference(kvm->irq_routing);
Gleb Natapov46e624b2009-08-24 11:54:20 +0300185 if (irq < irq_rt->nr_rt_entries)
Gleb Natapoveba02262009-08-24 11:54:25 +0300186 hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
187 irq_set[i++] = *e;
Gleb Natapove42bba92009-08-24 11:54:22 +0300188 rcu_read_unlock();
Gleb Natapoveba02262009-08-24 11:54:25 +0300189
190 while(i--) {
191 int r;
192 r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
193 if (r < 0)
194 continue;
195
196 ret = r + ((ret < 0) ? 0 : ret);
197 }
198
Gleb Natapov49256632009-02-04 17:28:14 +0200199 return ret;
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800200}
201
Michael S. Tsirkin01f21882012-10-17 18:06:02 +0200202/*
203 * Deliver an IRQ in an atomic context if we can, or return a failure,
204 * user can retry in a process context.
205 * Return value:
206 * -EWOULDBLOCK - Can't deliver in atomic context: retry in a process context.
207 * Other values - No need to retry.
208 */
209int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level)
210{
211 struct kvm_kernel_irq_routing_entry *e;
212 int ret = -EINVAL;
213 struct kvm_irq_routing_table *irq_rt;
214 struct hlist_node *n;
215
216 trace_kvm_set_irq(irq, level, irq_source_id);
217
218 /*
219 * Injection into either PIC or IOAPIC might need to scan all CPUs,
220 * which would need to be retried from thread context; when same GSI
221 * is connected to both PIC and IOAPIC, we'd have to report a
222 * partial failure here.
223 * Since there's no easy way to do this, we only support injecting MSI
224 * which is limited to 1:1 GSI mapping.
225 */
226 rcu_read_lock();
227 irq_rt = rcu_dereference(kvm->irq_routing);
228 if (irq < irq_rt->nr_rt_entries)
229 hlist_for_each_entry(e, n, &irq_rt->map[irq], link) {
230 if (likely(e->type == KVM_IRQ_ROUTING_MSI))
231 ret = kvm_set_msi_inatomic(e, kvm);
232 else
233 ret = -EWOULDBLOCK;
234 break;
235 }
236 rcu_read_unlock();
237 return ret;
238}
239
Marcelo Tosatti44882ee2009-01-27 15:12:38 -0200240void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800241{
242 struct kvm_irq_ack_notifier *kian;
243 struct hlist_node *n;
Gleb Natapov3e71f882009-08-24 11:54:21 +0300244 int gsi;
Marcelo Tosatti44882ee2009-01-27 15:12:38 -0200245
Marcelo Tosatti229456f2009-06-17 09:22:14 -0300246 trace_kvm_ack_irq(irqchip, pin);
247
Gleb Natapove42bba92009-08-24 11:54:22 +0300248 rcu_read_lock();
249 gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
Gleb Natapov3e71f882009-08-24 11:54:21 +0300250 if (gsi != -1)
Gleb Natapov280aa172009-08-24 11:54:24 +0300251 hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
252 link)
Gleb Natapov3e71f882009-08-24 11:54:21 +0300253 if (kian->gsi == gsi)
254 kian->irq_acked(kian);
Gleb Natapov280aa172009-08-24 11:54:24 +0300255 rcu_read_unlock();
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800256}
257
258void kvm_register_irq_ack_notifier(struct kvm *kvm,
259 struct kvm_irq_ack_notifier *kian)
260{
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300261 mutex_lock(&kvm->irq_lock);
Gleb Natapov280aa172009-08-24 11:54:24 +0300262 hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300263 mutex_unlock(&kvm->irq_lock);
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800264}
265
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300266void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
267 struct kvm_irq_ack_notifier *kian)
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800268{
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300269 mutex_lock(&kvm->irq_lock);
Gleb Natapov280aa172009-08-24 11:54:24 +0300270 hlist_del_init_rcu(&kian->link);
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300271 mutex_unlock(&kvm->irq_lock);
Gleb Natapov280aa172009-08-24 11:54:24 +0300272 synchronize_rcu();
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800273}
Sheng Yang5550af42008-10-15 20:15:06 +0800274
Sheng Yang5550af42008-10-15 20:15:06 +0800275int kvm_request_irq_source_id(struct kvm *kvm)
276{
277 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300278 int irq_source_id;
279
280 mutex_lock(&kvm->irq_lock);
Marcelo Tosatticd5a2682009-10-17 22:47:23 -0300281 irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
Mark McLoughlin61552362008-12-01 13:57:48 +0000282
Marcelo Tosatticd5a2682009-10-17 22:47:23 -0300283 if (irq_source_id >= BITS_PER_LONG) {
Sheng Yang5550af42008-10-15 20:15:06 +0800284 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
Jiri Slaby0c6ddce2009-09-25 09:33:38 +0200285 irq_source_id = -EFAULT;
286 goto unlock;
Mark McLoughlin61552362008-12-01 13:57:48 +0000287 }
288
289 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
Alex Williamson7a844282012-09-21 11:58:03 -0600290#ifdef CONFIG_X86
291 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
292#endif
Mark McLoughlin61552362008-12-01 13:57:48 +0000293 set_bit(irq_source_id, bitmap);
Jiri Slaby0c6ddce2009-09-25 09:33:38 +0200294unlock:
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300295 mutex_unlock(&kvm->irq_lock);
Mark McLoughlin61552362008-12-01 13:57:48 +0000296
Sheng Yang5550af42008-10-15 20:15:06 +0800297 return irq_source_id;
298}
299
300void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
301{
Mark McLoughlin61552362008-12-01 13:57:48 +0000302 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
Alex Williamson7a844282012-09-21 11:58:03 -0600303#ifdef CONFIG_X86
304 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
305#endif
Mark McLoughlin61552362008-12-01 13:57:48 +0000306
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300307 mutex_lock(&kvm->irq_lock);
Mark McLoughlin61552362008-12-01 13:57:48 +0000308 if (irq_source_id < 0 ||
Marcelo Tosatticd5a2682009-10-17 22:47:23 -0300309 irq_source_id >= BITS_PER_LONG) {
Sheng Yang5550af42008-10-15 20:15:06 +0800310 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
Jiri Slaby0c6ddce2009-09-25 09:33:38 +0200311 goto unlock;
Sheng Yang5550af42008-10-15 20:15:06 +0800312 }
Marcelo Tosattie50212b2009-10-29 13:44:17 -0200313 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
314 if (!irqchip_in_kernel(kvm))
315 goto unlock;
316
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300317 kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
Gleb Natapov1a6e4a82009-08-24 11:54:19 +0300318#ifdef CONFIG_X86
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300319 kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id);
Gleb Natapov1a6e4a82009-08-24 11:54:19 +0300320#endif
Jiri Slaby0c6ddce2009-09-25 09:33:38 +0200321unlock:
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300322 mutex_unlock(&kvm->irq_lock);
Sheng Yang5550af42008-10-15 20:15:06 +0800323}
Avi Kivity75858a82009-01-04 17:10:50 +0200324
325void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
326 struct kvm_irq_mask_notifier *kimn)
327{
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300328 mutex_lock(&kvm->irq_lock);
Avi Kivity75858a82009-01-04 17:10:50 +0200329 kimn->irq = irq;
Gleb Natapov280aa172009-08-24 11:54:24 +0300330 hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300331 mutex_unlock(&kvm->irq_lock);
Avi Kivity75858a82009-01-04 17:10:50 +0200332}
333
334void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
335 struct kvm_irq_mask_notifier *kimn)
336{
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300337 mutex_lock(&kvm->irq_lock);
Gleb Natapov280aa172009-08-24 11:54:24 +0300338 hlist_del_rcu(&kimn->link);
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300339 mutex_unlock(&kvm->irq_lock);
Gleb Natapov280aa172009-08-24 11:54:24 +0300340 synchronize_rcu();
Avi Kivity75858a82009-01-04 17:10:50 +0200341}
342
Gleb Natapov4a994352010-07-11 15:32:23 +0300343void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
344 bool mask)
Avi Kivity75858a82009-01-04 17:10:50 +0200345{
346 struct kvm_irq_mask_notifier *kimn;
347 struct hlist_node *n;
Gleb Natapov4a994352010-07-11 15:32:23 +0300348 int gsi;
Avi Kivity75858a82009-01-04 17:10:50 +0200349
Gleb Natapov280aa172009-08-24 11:54:24 +0300350 rcu_read_lock();
Gleb Natapov4a994352010-07-11 15:32:23 +0300351 gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
352 if (gsi != -1)
353 hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
354 if (kimn->irq == gsi)
355 kimn->func(kimn, mask);
Gleb Natapov280aa172009-08-24 11:54:24 +0300356 rcu_read_unlock();
Avi Kivity75858a82009-01-04 17:10:50 +0200357}
358
Avi Kivity399ec802008-11-19 13:58:46 +0200359void kvm_free_irq_routing(struct kvm *kvm)
360{
Gleb Natapove42bba92009-08-24 11:54:22 +0300361 /* Called only during vm destruction. Nobody can use the pointer
362 at this stage */
Gleb Natapov46e624b2009-08-24 11:54:20 +0300363 kfree(kvm->irq_routing);
Avi Kivity399ec802008-11-19 13:58:46 +0200364}
365
Gleb Natapov46e624b2009-08-24 11:54:20 +0300366static int setup_routing_entry(struct kvm_irq_routing_table *rt,
367 struct kvm_kernel_irq_routing_entry *e,
Hannes Edercded19f2009-02-21 02:19:13 +0100368 const struct kvm_irq_routing_entry *ue)
Avi Kivity399ec802008-11-19 13:58:46 +0200369{
370 int r = -EINVAL;
371 int delta;
Marcelo Tosattid72118c2010-01-12 16:42:09 -0200372 unsigned max_pin;
Gleb Natapov46e624b2009-08-24 11:54:20 +0300373 struct kvm_kernel_irq_routing_entry *ei;
374 struct hlist_node *n;
375
376 /*
377 * Do not allow GSI to be mapped to the same irqchip more than once.
378 * Allow only one to one mapping between GSI and MSI.
379 */
380 hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
381 if (ei->type == KVM_IRQ_ROUTING_MSI ||
Avi Kivityf2ebd422012-04-22 17:02:11 +0300382 ue->type == KVM_IRQ_ROUTING_MSI ||
Gleb Natapov46e624b2009-08-24 11:54:20 +0300383 ue->u.irqchip.irqchip == ei->irqchip.irqchip)
384 return r;
Avi Kivity399ec802008-11-19 13:58:46 +0200385
386 e->gsi = ue->gsi;
Michael S. Tsirkin5116d8f2009-07-26 17:10:01 +0300387 e->type = ue->type;
Avi Kivity399ec802008-11-19 13:58:46 +0200388 switch (ue->type) {
389 case KVM_IRQ_ROUTING_IRQCHIP:
390 delta = 0;
391 switch (ue->u.irqchip.irqchip) {
392 case KVM_IRQCHIP_PIC_MASTER:
393 e->set = kvm_set_pic_irq;
Michael S. Tsirkin93b65472012-07-19 13:55:53 +0300394 max_pin = PIC_NUM_PINS;
Avi Kivity399ec802008-11-19 13:58:46 +0200395 break;
396 case KVM_IRQCHIP_PIC_SLAVE:
Gleb Natapov49256632009-02-04 17:28:14 +0200397 e->set = kvm_set_pic_irq;
Michael S. Tsirkin93b65472012-07-19 13:55:53 +0300398 max_pin = PIC_NUM_PINS;
Avi Kivity399ec802008-11-19 13:58:46 +0200399 delta = 8;
400 break;
401 case KVM_IRQCHIP_IOAPIC:
Marcelo Tosattid72118c2010-01-12 16:42:09 -0200402 max_pin = KVM_IOAPIC_NUM_PINS;
Chris Wrightefbc1002009-05-01 14:15:43 -0700403 e->set = kvm_set_ioapic_irq;
Avi Kivity399ec802008-11-19 13:58:46 +0200404 break;
405 default:
406 goto out;
407 }
408 e->irqchip.irqchip = ue->u.irqchip.irqchip;
409 e->irqchip.pin = ue->u.irqchip.pin + delta;
Marcelo Tosattid72118c2010-01-12 16:42:09 -0200410 if (e->irqchip.pin >= max_pin)
Gleb Natapov3e71f882009-08-24 11:54:21 +0300411 goto out;
412 rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
Avi Kivity399ec802008-11-19 13:58:46 +0200413 break;
Sheng Yang79950e12009-02-10 13:57:06 +0800414 case KVM_IRQ_ROUTING_MSI:
415 e->set = kvm_set_msi;
416 e->msi.address_lo = ue->u.msi.address_lo;
417 e->msi.address_hi = ue->u.msi.address_hi;
418 e->msi.data = ue->u.msi.data;
419 break;
Avi Kivity399ec802008-11-19 13:58:46 +0200420 default:
421 goto out;
422 }
Gleb Natapov46e624b2009-08-24 11:54:20 +0300423
424 hlist_add_head(&e->link, &rt->map[e->gsi]);
Avi Kivity399ec802008-11-19 13:58:46 +0200425 r = 0;
426out:
427 return r;
428}
429
430
431int kvm_set_irq_routing(struct kvm *kvm,
432 const struct kvm_irq_routing_entry *ue,
433 unsigned nr,
434 unsigned flags)
435{
Gleb Natapov46e624b2009-08-24 11:54:20 +0300436 struct kvm_irq_routing_table *new, *old;
Gleb Natapov3e71f882009-08-24 11:54:21 +0300437 u32 i, j, nr_rt_entries = 0;
Avi Kivity399ec802008-11-19 13:58:46 +0200438 int r;
439
440 for (i = 0; i < nr; ++i) {
Gleb Natapov46e624b2009-08-24 11:54:20 +0300441 if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
442 return -EINVAL;
443 nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
444 }
445
446 nr_rt_entries += 1;
447
448 new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
449 + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
450 GFP_KERNEL);
451
452 if (!new)
453 return -ENOMEM;
454
455 new->rt_entries = (void *)&new->map[nr_rt_entries];
456
457 new->nr_rt_entries = nr_rt_entries;
Gleb Natapov3e71f882009-08-24 11:54:21 +0300458 for (i = 0; i < 3; i++)
459 for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
460 new->chip[i][j] = -1;
Gleb Natapov46e624b2009-08-24 11:54:20 +0300461
462 for (i = 0; i < nr; ++i) {
Avi Kivity399ec802008-11-19 13:58:46 +0200463 r = -EINVAL;
Avi Kivity399ec802008-11-19 13:58:46 +0200464 if (ue->flags)
465 goto out;
Gleb Natapov46e624b2009-08-24 11:54:20 +0300466 r = setup_routing_entry(new, &new->rt_entries[i], ue);
Avi Kivity399ec802008-11-19 13:58:46 +0200467 if (r)
468 goto out;
469 ++ue;
Avi Kivity399ec802008-11-19 13:58:46 +0200470 }
471
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300472 mutex_lock(&kvm->irq_lock);
Gleb Natapov46e624b2009-08-24 11:54:20 +0300473 old = kvm->irq_routing;
Michael S. Tsirkinbd2b53b2010-11-18 19:09:08 +0200474 kvm_irq_routing_update(kvm, new);
Marcelo Tosattifa40a822009-06-04 15:08:24 -0300475 mutex_unlock(&kvm->irq_lock);
Michael S. Tsirkinbd2b53b2010-11-18 19:09:08 +0200476
Gleb Natapove42bba92009-08-24 11:54:22 +0300477 synchronize_rcu();
Avi Kivity399ec802008-11-19 13:58:46 +0200478
Gleb Natapov46e624b2009-08-24 11:54:20 +0300479 new = old;
Avi Kivity399ec802008-11-19 13:58:46 +0200480 r = 0;
481
482out:
Gleb Natapov46e624b2009-08-24 11:54:20 +0300483 kfree(new);
Avi Kivity399ec802008-11-19 13:58:46 +0200484 return r;
485}
486
487#define IOAPIC_ROUTING_ENTRY(irq) \
488 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
489 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
490#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
491
492#ifdef CONFIG_X86
Avi Kivity399ec802008-11-19 13:58:46 +0200493# define PIC_ROUTING_ENTRY(irq) \
494 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
495 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
496# define ROUTING_ENTRY2(irq) \
497 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
498#else
499# define ROUTING_ENTRY2(irq) \
500 IOAPIC_ROUTING_ENTRY(irq)
501#endif
502
503static const struct kvm_irq_routing_entry default_routing[] = {
504 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
505 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
506 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
507 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
508 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
509 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
510 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
511 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
512 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
513 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
514 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
515 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
516#ifdef CONFIG_IA64
517 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
518 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
519 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
520 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
521 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
522 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
523 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
524 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
525 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
526 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
527 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
528 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
529#endif
530};
531
532int kvm_setup_default_irq_routing(struct kvm *kvm)
533{
534 return kvm_set_irq_routing(kvm, default_routing,
535 ARRAY_SIZE(default_routing), 0);
536}