Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001 MandrakeSoft S.A. |
Avi Kivity | 221d059 | 2010-05-23 18:37:00 +0300 | [diff] [blame] | 3 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 4 | * |
| 5 | * MandrakeSoft S.A. |
| 6 | * 43, rue d'Aboukir |
| 7 | * 75002 Paris - France |
| 8 | * http://www.linux-mandrake.com/ |
| 9 | * http://www.mandrakesoft.com/ |
| 10 | * |
| 11 | * This library is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU Lesser General Public |
| 13 | * License as published by the Free Software Foundation; either |
| 14 | * version 2 of the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This library is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | * Lesser General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU Lesser General Public |
| 22 | * License along with this library; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 24 | * |
| 25 | * Yunhong Jiang <yunhong.jiang@intel.com> |
| 26 | * Yaozu (Eddie) Dong <eddie.dong@intel.com> |
| 27 | * Based on Xen 3.1 code. |
| 28 | */ |
Sean Christopherson | 8d20bd6 | 2022-11-30 23:09:18 +0000 | [diff] [blame] | 29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 30 | |
Avi Kivity | edf8841 | 2007-12-16 11:02:48 +0200 | [diff] [blame] | 31 | #include <linux/kvm_host.h> |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 32 | #include <linux/kvm.h> |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/highmem.h> |
| 35 | #include <linux/smp.h> |
| 36 | #include <linux/hrtimer.h> |
| 37 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/slab.h> |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 39 | #include <linux/export.h> |
Marios Pomonis | 8c86405 | 2019-12-11 12:47:44 -0800 | [diff] [blame] | 40 | #include <linux/nospec.h> |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 41 | #include <asm/processor.h> |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 42 | #include <asm/page.h> |
| 43 | #include <asm/current.h> |
Gleb Natapov | 1000ff8 | 2009-07-07 16:00:57 +0300 | [diff] [blame] | 44 | #include <trace/events/kvm.h> |
Zhang Xiantao | 8247019 | 2007-12-17 13:59:56 +0800 | [diff] [blame] | 45 | |
| 46 | #include "ioapic.h" |
| 47 | #include "lapic.h" |
Marcelo Tosatti | f524472 | 2008-07-26 17:01:00 -0300 | [diff] [blame] | 48 | #include "irq.h" |
Zhang Xiantao | 8247019 | 2007-12-17 13:59:56 +0800 | [diff] [blame] | 49 | |
Paolo Bonzini | 0b10a1c | 2014-03-18 11:51:29 +0100 | [diff] [blame] | 50 | static int ioapic_service(struct kvm_ioapic *vioapic, int irq, |
Yang Zhang | aa2fbe6 | 2013-04-11 19:21:40 +0800 | [diff] [blame] | 51 | bool line_status); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 52 | |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 53 | static void kvm_ioapic_update_eoi_one(struct kvm_vcpu *vcpu, |
| 54 | struct kvm_ioapic *ioapic, |
| 55 | int trigger_mode, |
| 56 | int pin); |
| 57 | |
Jinrong Liang | 019024e5 | 2022-01-25 17:59:03 +0800 | [diff] [blame] | 58 | static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 59 | { |
| 60 | unsigned long result = 0; |
| 61 | |
| 62 | switch (ioapic->ioregsel) { |
| 63 | case IOAPIC_REG_VERSION: |
| 64 | result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16) |
| 65 | | (IOAPIC_VERSION_ID & 0xff)); |
| 66 | break; |
| 67 | |
| 68 | case IOAPIC_REG_APIC_ID: |
| 69 | case IOAPIC_REG_ARB_ID: |
| 70 | result = ((ioapic->id & 0xf) << 24); |
| 71 | break; |
| 72 | |
| 73 | default: |
| 74 | { |
| 75 | u32 redir_index = (ioapic->ioregsel - 0x10) >> 1; |
Marios Pomonis | 8c86405 | 2019-12-11 12:47:44 -0800 | [diff] [blame] | 76 | u64 redir_content = ~0ULL; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 77 | |
Marios Pomonis | 8c86405 | 2019-12-11 12:47:44 -0800 | [diff] [blame] | 78 | if (redir_index < IOAPIC_NUM_PINS) { |
| 79 | u32 index = array_index_nospec( |
| 80 | redir_index, IOAPIC_NUM_PINS); |
| 81 | |
| 82 | redir_content = ioapic->redirtbl[index].bits; |
| 83 | } |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 84 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 85 | result = (ioapic->ioregsel & 0x1) ? |
| 86 | (redir_content >> 32) & 0xffffffff : |
| 87 | redir_content & 0xffffffff; |
| 88 | break; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | return result; |
| 93 | } |
| 94 | |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 95 | static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic) |
| 96 | { |
| 97 | ioapic->rtc_status.pending_eoi = 0; |
Juergen Gross | a1c42dd | 2021-09-13 15:57:44 +0200 | [diff] [blame] | 98 | bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPU_IDS); |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 99 | } |
| 100 | |
Paolo Bonzini | 4009b24 | 2014-03-28 20:41:51 +0100 | [diff] [blame] | 101 | static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic); |
| 102 | |
| 103 | static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic) |
| 104 | { |
| 105 | if (WARN_ON(ioapic->rtc_status.pending_eoi < 0)) |
| 106 | kvm_rtc_eoi_tracking_restore_all(ioapic); |
| 107 | } |
| 108 | |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 109 | static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) |
| 110 | { |
| 111 | bool new_val, old_val; |
| 112 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; |
Paolo Bonzini | b0eaf45 | 2016-09-14 23:39:12 +0200 | [diff] [blame] | 113 | struct dest_map *dest_map = &ioapic->rtc_status.dest_map; |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 114 | union kvm_ioapic_redirect_entry *e; |
| 115 | |
| 116 | e = &ioapic->redirtbl[RTC_GSI]; |
Peter Xu | 5c69d5c | 2019-12-04 20:07:20 +0100 | [diff] [blame] | 117 | if (!kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT, |
| 118 | e->fields.dest_id, |
| 119 | kvm_lapic_irq_dest_mode(!!e->fields.dest_mode))) |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 120 | return; |
| 121 | |
| 122 | new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector); |
Paolo Bonzini | b0eaf45 | 2016-09-14 23:39:12 +0200 | [diff] [blame] | 123 | old_val = test_bit(vcpu->vcpu_id, dest_map->map); |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 124 | |
| 125 | if (new_val == old_val) |
| 126 | return; |
| 127 | |
| 128 | if (new_val) { |
Paolo Bonzini | b0eaf45 | 2016-09-14 23:39:12 +0200 | [diff] [blame] | 129 | __set_bit(vcpu->vcpu_id, dest_map->map); |
| 130 | dest_map->vectors[vcpu->vcpu_id] = e->fields.vector; |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 131 | ioapic->rtc_status.pending_eoi++; |
| 132 | } else { |
Paolo Bonzini | b0eaf45 | 2016-09-14 23:39:12 +0200 | [diff] [blame] | 133 | __clear_bit(vcpu->vcpu_id, dest_map->map); |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 134 | ioapic->rtc_status.pending_eoi--; |
Paolo Bonzini | 4009b24 | 2014-03-28 20:41:51 +0100 | [diff] [blame] | 135 | rtc_status_pending_eoi_check_valid(ioapic); |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 136 | } |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) |
| 140 | { |
| 141 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; |
| 142 | |
| 143 | spin_lock(&ioapic->lock); |
| 144 | __rtc_irq_eoi_tracking_restore_one(vcpu); |
| 145 | spin_unlock(&ioapic->lock); |
| 146 | } |
| 147 | |
| 148 | static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic) |
| 149 | { |
| 150 | struct kvm_vcpu *vcpu; |
Marc Zyngier | 46808a4 | 2021-11-16 16:04:02 +0000 | [diff] [blame] | 151 | unsigned long i; |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 152 | |
| 153 | if (RTC_GSI >= IOAPIC_NUM_PINS) |
| 154 | return; |
| 155 | |
| 156 | rtc_irq_eoi_tracking_reset(ioapic); |
| 157 | kvm_for_each_vcpu(i, vcpu, ioapic->kvm) |
| 158 | __rtc_irq_eoi_tracking_restore_one(vcpu); |
| 159 | } |
| 160 | |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 161 | static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu, |
| 162 | int vector) |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 163 | { |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 164 | struct dest_map *dest_map = &ioapic->rtc_status.dest_map; |
| 165 | |
| 166 | /* RTC special handling */ |
| 167 | if (test_bit(vcpu->vcpu_id, dest_map->map) && |
| 168 | (vector == dest_map->vectors[vcpu->vcpu_id]) && |
| 169 | (test_and_clear_bit(vcpu->vcpu_id, |
| 170 | ioapic->rtc_status.dest_map.map))) { |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 171 | --ioapic->rtc_status.pending_eoi; |
Paolo Bonzini | 4009b24 | 2014-03-28 20:41:51 +0100 | [diff] [blame] | 172 | rtc_status_pending_eoi_check_valid(ioapic); |
| 173 | } |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic) |
| 177 | { |
| 178 | if (ioapic->rtc_status.pending_eoi > 0) |
| 179 | return true; /* coalesced */ |
| 180 | |
| 181 | return false; |
| 182 | } |
| 183 | |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 184 | static void ioapic_lazy_update_eoi(struct kvm_ioapic *ioapic, int irq) |
| 185 | { |
Marc Zyngier | 46808a4 | 2021-11-16 16:04:02 +0000 | [diff] [blame] | 186 | unsigned long i; |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 187 | struct kvm_vcpu *vcpu; |
| 188 | union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; |
| 189 | |
| 190 | kvm_for_each_vcpu(i, vcpu, ioapic->kvm) { |
| 191 | if (!kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT, |
| 192 | entry->fields.dest_id, |
| 193 | entry->fields.dest_mode) || |
| 194 | kvm_apic_pending_eoi(vcpu, entry->fields.vector)) |
| 195 | continue; |
| 196 | |
| 197 | /* |
| 198 | * If no longer has pending EOI in LAPICs, update |
Vitaly Kuznetsov | 7737706 | 2020-10-24 04:13:24 -0400 | [diff] [blame] | 199 | * EOI for this vector. |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 200 | */ |
| 201 | rtc_irq_eoi(ioapic, vcpu, entry->fields.vector); |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 202 | break; |
| 203 | } |
| 204 | } |
| 205 | |
Paolo Bonzini | 44847de | 2014-03-18 12:00:14 +0100 | [diff] [blame] | 206 | static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq, |
| 207 | int irq_level, bool line_status) |
| 208 | { |
| 209 | union kvm_ioapic_redirect_entry entry; |
| 210 | u32 mask = 1 << irq; |
| 211 | u32 old_irr; |
| 212 | int edge, ret; |
| 213 | |
| 214 | entry = ioapic->redirtbl[irq]; |
| 215 | edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); |
| 216 | |
| 217 | if (!irq_level) { |
| 218 | ioapic->irr &= ~mask; |
| 219 | ret = 1; |
| 220 | goto out; |
| 221 | } |
| 222 | |
| 223 | /* |
Paolo Bonzini | 8be8f93 | 2020-05-04 12:19:45 -0400 | [diff] [blame] | 224 | * AMD SVM AVIC accelerate EOI write iff the interrupt is edge |
| 225 | * triggered, in which case the in-kernel IOAPIC will not be able |
| 226 | * to receive the EOI. In this case, we do a lazy update of the |
| 227 | * pending EOI when trying to set IOAPIC irq. |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 228 | */ |
Paolo Bonzini | 8be8f93 | 2020-05-04 12:19:45 -0400 | [diff] [blame] | 229 | if (edge && kvm_apicv_activated(ioapic->kvm)) |
Suravee Suthikulpanit | f458d03 | 2019-11-14 14:15:19 -0600 | [diff] [blame] | 230 | ioapic_lazy_update_eoi(ioapic, irq); |
| 231 | |
| 232 | /* |
Paolo Bonzini | 44847de | 2014-03-18 12:00:14 +0100 | [diff] [blame] | 233 | * Return 0 for coalesced interrupts; for edge-triggered interrupts, |
| 234 | * this only happens if a previous edge has not been delivered due |
Miaohe Lin | 0011679 | 2019-12-11 14:26:23 +0800 | [diff] [blame] | 235 | * to masking. For level interrupts, the remote_irr field tells |
Paolo Bonzini | 44847de | 2014-03-18 12:00:14 +0100 | [diff] [blame] | 236 | * us if the interrupt is waiting for an EOI. |
| 237 | * |
| 238 | * RTC is special: it is edge-triggered, but userspace likes to know |
| 239 | * if it has been already ack-ed via EOI because coalesced RTC |
| 240 | * interrupts lead to time drift in Windows guests. So we track |
| 241 | * EOI manually for the RTC interrupt. |
| 242 | */ |
| 243 | if (irq == RTC_GSI && line_status && |
| 244 | rtc_irq_check_coalesced(ioapic)) { |
| 245 | ret = 0; |
| 246 | goto out; |
| 247 | } |
| 248 | |
| 249 | old_irr = ioapic->irr; |
| 250 | ioapic->irr |= mask; |
Nikita Leshenko | 7d22536 | 2017-11-05 15:52:31 +0200 | [diff] [blame] | 251 | if (edge) { |
Wincy Van | 5bda6ee | 2014-12-24 11:14:29 +0800 | [diff] [blame] | 252 | ioapic->irr_delivered &= ~mask; |
Nikita Leshenko | 7d22536 | 2017-11-05 15:52:31 +0200 | [diff] [blame] | 253 | if (old_irr == ioapic->irr) { |
| 254 | ret = 0; |
| 255 | goto out; |
| 256 | } |
Paolo Bonzini | 44847de | 2014-03-18 12:00:14 +0100 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | ret = ioapic_service(ioapic, irq, line_status); |
| 260 | |
| 261 | out: |
| 262 | trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); |
| 263 | return ret; |
| 264 | } |
| 265 | |
Paolo Bonzini | 673f7b4 | 2014-03-18 11:39:23 +0100 | [diff] [blame] | 266 | static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr) |
| 267 | { |
| 268 | u32 idx; |
| 269 | |
| 270 | rtc_irq_eoi_tracking_reset(ioapic); |
| 271 | for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS) |
| 272 | ioapic_set_irq(ioapic, idx, 1, true); |
| 273 | |
| 274 | kvm_rtc_eoi_tracking_restore_all(ioapic); |
| 275 | } |
| 276 | |
| 277 | |
Andrey Smetanin | 6308630 | 2015-11-10 15:36:32 +0300 | [diff] [blame] | 278 | void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, ulong *ioapic_handled_vectors) |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 279 | { |
| 280 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; |
Joerg Roedel | 4d99ba8 | 2016-02-29 16:04:45 +0100 | [diff] [blame] | 281 | struct dest_map *dest_map = &ioapic->rtc_status.dest_map; |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 282 | union kvm_ioapic_redirect_entry *e; |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 283 | int index; |
| 284 | |
| 285 | spin_lock(&ioapic->lock); |
Joerg Roedel | 4d99ba8 | 2016-02-29 16:04:45 +0100 | [diff] [blame] | 286 | |
| 287 | /* Make sure we see any missing RTC EOI */ |
| 288 | if (test_bit(vcpu->vcpu_id, dest_map->map)) |
| 289 | __set_bit(dest_map->vectors[vcpu->vcpu_id], |
| 290 | ioapic_handled_vectors); |
| 291 | |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 292 | for (index = 0; index < IOAPIC_NUM_PINS; index++) { |
| 293 | e = &ioapic->redirtbl[index]; |
Paolo Bonzini | 0f6c0a7 | 2014-07-30 18:07:24 +0200 | [diff] [blame] | 294 | if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG || |
| 295 | kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) || |
| 296 | index == RTC_GSI) { |
Peter Xu | 5c69d5c | 2019-12-04 20:07:20 +0100 | [diff] [blame] | 297 | u16 dm = kvm_lapic_irq_dest_mode(!!e->fields.dest_mode); |
| 298 | |
| 299 | if (kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT, |
| 300 | e->fields.dest_id, dm) || |
Nikita Leshenko | 0fc5a36 | 2017-11-05 15:52:29 +0200 | [diff] [blame] | 301 | kvm_apic_pending_eoi(vcpu, e->fields.vector)) |
Yang Zhang | cf9e65b | 2013-04-11 19:25:14 +0800 | [diff] [blame] | 302 | __set_bit(e->fields.vector, |
Andrey Smetanin | 6308630 | 2015-11-10 15:36:32 +0300 | [diff] [blame] | 303 | ioapic_handled_vectors); |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 304 | } |
| 305 | } |
| 306 | spin_unlock(&ioapic->lock); |
| 307 | } |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 308 | |
David Hildenbrand | 993225a | 2017-04-07 10:50:33 +0200 | [diff] [blame] | 309 | void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm) |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 310 | { |
David Hildenbrand | 0bceb15 | 2017-04-07 10:50:25 +0200 | [diff] [blame] | 311 | if (!ioapic_in_kernel(kvm)) |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 312 | return; |
Yang Zhang | 3d81bc7 | 2013-04-11 19:25:13 +0800 | [diff] [blame] | 313 | kvm_make_scan_ioapic_request(kvm); |
Yang Zhang | c7c9c56 | 2013-01-25 10:18:51 +0800 | [diff] [blame] | 314 | } |
| 315 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 316 | static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) |
| 317 | { |
| 318 | unsigned index; |
Avi Kivity | 75858a8 | 2009-01-04 17:10:50 +0200 | [diff] [blame] | 319 | bool mask_before, mask_after; |
Gleb Natapov | 70f93da | 2009-07-05 18:48:12 +0300 | [diff] [blame] | 320 | union kvm_ioapic_redirect_entry *e; |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 321 | int old_remote_irr, old_delivery_status, old_dest_id, old_dest_mode; |
Vitaly Kuznetsov | 2f9b68f | 2021-08-27 11:25:14 +0200 | [diff] [blame] | 322 | DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 323 | |
| 324 | switch (ioapic->ioregsel) { |
| 325 | case IOAPIC_REG_VERSION: |
| 326 | /* Writes are ignored. */ |
| 327 | break; |
| 328 | |
| 329 | case IOAPIC_REG_APIC_ID: |
| 330 | ioapic->id = (val >> 24) & 0xf; |
| 331 | break; |
| 332 | |
| 333 | case IOAPIC_REG_ARB_ID: |
| 334 | break; |
| 335 | |
| 336 | default: |
| 337 | index = (ioapic->ioregsel - 0x10) >> 1; |
| 338 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 339 | if (index >= IOAPIC_NUM_PINS) |
| 340 | return; |
Marios Pomonis | 6705645 | 2019-12-11 12:47:45 -0800 | [diff] [blame] | 341 | index = array_index_nospec(index, IOAPIC_NUM_PINS); |
Gleb Natapov | 70f93da | 2009-07-05 18:48:12 +0300 | [diff] [blame] | 342 | e = &ioapic->redirtbl[index]; |
| 343 | mask_before = e->fields.mask; |
Nikita Leshenko | b200dded | 2017-11-05 15:52:33 +0200 | [diff] [blame] | 344 | /* Preserve read-only fields */ |
| 345 | old_remote_irr = e->fields.remote_irr; |
| 346 | old_delivery_status = e->fields.delivery_status; |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 347 | old_dest_id = e->fields.dest_id; |
| 348 | old_dest_mode = e->fields.dest_mode; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 349 | if (ioapic->ioregsel & 1) { |
Gleb Natapov | 70f93da | 2009-07-05 18:48:12 +0300 | [diff] [blame] | 350 | e->bits &= 0xffffffff; |
| 351 | e->bits |= (u64) val << 32; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 352 | } else { |
Gleb Natapov | 70f93da | 2009-07-05 18:48:12 +0300 | [diff] [blame] | 353 | e->bits &= ~0xffffffffULL; |
| 354 | e->bits |= (u32) val; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 355 | } |
Nikita Leshenko | b200dded | 2017-11-05 15:52:33 +0200 | [diff] [blame] | 356 | e->fields.remote_irr = old_remote_irr; |
| 357 | e->fields.delivery_status = old_delivery_status; |
Nikita Leshenko | a8bfec2 | 2017-11-05 15:52:32 +0200 | [diff] [blame] | 358 | |
| 359 | /* |
| 360 | * Some OSes (Linux, Xen) assume that Remote IRR bit will |
| 361 | * be cleared by IOAPIC hardware when the entry is configured |
| 362 | * as edge-triggered. This behavior is used to simulate an |
| 363 | * explicit EOI on IOAPICs that don't have the EOI register. |
| 364 | */ |
| 365 | if (e->fields.trig_mode == IOAPIC_EDGE_TRIG) |
| 366 | e->fields.remote_irr = 0; |
| 367 | |
Gleb Natapov | 70f93da | 2009-07-05 18:48:12 +0300 | [diff] [blame] | 368 | mask_after = e->fields.mask; |
Avi Kivity | 75858a8 | 2009-01-04 17:10:50 +0200 | [diff] [blame] | 369 | if (mask_before != mask_after) |
Gleb Natapov | 4a99435 | 2010-07-11 15:32:23 +0300 | [diff] [blame] | 370 | kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after); |
Gleb Natapov | 70f93da | 2009-07-05 18:48:12 +0300 | [diff] [blame] | 371 | if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG |
Gleb Natapov | b4a2f5e | 2009-07-05 18:48:11 +0300 | [diff] [blame] | 372 | && ioapic->irr & (1 << index)) |
Yang Zhang | aa2fbe6 | 2013-04-11 19:21:40 +0800 | [diff] [blame] | 373 | ioapic_service(ioapic, index, false); |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 374 | if (e->fields.delivery_mode == APIC_DM_FIXED) { |
| 375 | struct kvm_lapic_irq irq; |
| 376 | |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 377 | irq.vector = e->fields.vector; |
| 378 | irq.delivery_mode = e->fields.delivery_mode << 8; |
Peter Xu | c96001c | 2019-12-04 20:07:18 +0100 | [diff] [blame] | 379 | irq.dest_mode = |
| 380 | kvm_lapic_irq_dest_mode(!!e->fields.dest_mode); |
Nitesh Narayan Lal | 0c22056 | 2020-03-13 09:16:24 -0400 | [diff] [blame] | 381 | irq.level = false; |
| 382 | irq.trig_mode = e->fields.trig_mode; |
| 383 | irq.shorthand = APIC_DEST_NOSHORT; |
| 384 | irq.dest_id = e->fields.dest_id; |
| 385 | irq.msi_redir_hint = false; |
Vitaly Kuznetsov | 2f9b68f | 2021-08-27 11:25:14 +0200 | [diff] [blame] | 386 | bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS); |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 387 | kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq, |
Vitaly Kuznetsov | 2f9b68f | 2021-08-27 11:25:14 +0200 | [diff] [blame] | 388 | vcpu_bitmap); |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 389 | if (old_dest_mode != e->fields.dest_mode || |
| 390 | old_dest_id != e->fields.dest_id) { |
| 391 | /* |
| 392 | * Update vcpu_bitmap with vcpus specified in |
| 393 | * the previous request as well. This is done to |
| 394 | * keep ioapic_handled_vectors synchronized. |
| 395 | */ |
| 396 | irq.dest_id = old_dest_id; |
Peter Xu | c96001c | 2019-12-04 20:07:18 +0100 | [diff] [blame] | 397 | irq.dest_mode = |
| 398 | kvm_lapic_irq_dest_mode( |
| 399 | !!e->fields.dest_mode); |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 400 | kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq, |
Vitaly Kuznetsov | 2f9b68f | 2021-08-27 11:25:14 +0200 | [diff] [blame] | 401 | vcpu_bitmap); |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 402 | } |
| 403 | kvm_make_scan_ioapic_request_mask(ioapic->kvm, |
Vitaly Kuznetsov | 2f9b68f | 2021-08-27 11:25:14 +0200 | [diff] [blame] | 404 | vcpu_bitmap); |
Nitesh Narayan Lal | 7ee30bc | 2019-11-07 07:53:43 -0500 | [diff] [blame] | 405 | } else { |
| 406 | kvm_make_scan_ioapic_request(ioapic->kvm); |
| 407 | } |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 408 | break; |
| 409 | } |
| 410 | } |
| 411 | |
Paolo Bonzini | 0b10a1c | 2014-03-18 11:51:29 +0100 | [diff] [blame] | 412 | static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 413 | { |
Gleb Natapov | 58c2dde | 2009-03-05 16:35:04 +0200 | [diff] [blame] | 414 | union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; |
| 415 | struct kvm_lapic_irq irqe; |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 416 | int ret; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 417 | |
Nikita Leshenko | da3fe7b | 2017-11-05 15:52:30 +0200 | [diff] [blame] | 418 | if (entry->fields.mask || |
| 419 | (entry->fields.trig_mode == IOAPIC_LEVEL_TRIG && |
| 420 | entry->fields.remote_irr)) |
Paolo Bonzini | 0b10a1c | 2014-03-18 11:51:29 +0100 | [diff] [blame] | 421 | return -1; |
| 422 | |
Gleb Natapov | 58c2dde | 2009-03-05 16:35:04 +0200 | [diff] [blame] | 423 | irqe.dest_id = entry->fields.dest_id; |
| 424 | irqe.vector = entry->fields.vector; |
Peter Xu | c96001c | 2019-12-04 20:07:18 +0100 | [diff] [blame] | 425 | irqe.dest_mode = kvm_lapic_irq_dest_mode(!!entry->fields.dest_mode); |
Gleb Natapov | 58c2dde | 2009-03-05 16:35:04 +0200 | [diff] [blame] | 426 | irqe.trig_mode = entry->fields.trig_mode; |
| 427 | irqe.delivery_mode = entry->fields.delivery_mode << 8; |
| 428 | irqe.level = 1; |
Peter Xu | 150a84f | 2019-12-04 20:07:21 +0100 | [diff] [blame] | 429 | irqe.shorthand = APIC_DEST_NOSHORT; |
James Sullivan | 93bbf0b | 2015-03-18 19:26:03 -0600 | [diff] [blame] | 430 | irqe.msi_redir_hint = false; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 431 | |
Paolo Bonzini | 0bc830b | 2014-03-18 10:47:17 +0100 | [diff] [blame] | 432 | if (irqe.trig_mode == IOAPIC_EDGE_TRIG) |
Wincy Van | 5bda6ee | 2014-12-24 11:14:29 +0800 | [diff] [blame] | 433 | ioapic->irr_delivered |= 1 << irq; |
Paolo Bonzini | 0bc830b | 2014-03-18 10:47:17 +0100 | [diff] [blame] | 434 | |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 435 | if (irq == RTC_GSI && line_status) { |
Paolo Bonzini | 4009b24 | 2014-03-28 20:41:51 +0100 | [diff] [blame] | 436 | /* |
| 437 | * pending_eoi cannot ever become negative (see |
| 438 | * rtc_status_pending_eoi_check_valid) and the caller |
| 439 | * ensures that it is only called if it is >= zero, namely |
| 440 | * if rtc_irq_check_coalesced returns false). |
| 441 | */ |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 442 | BUG_ON(ioapic->rtc_status.pending_eoi != 0); |
| 443 | ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, |
Joerg Roedel | 9e4aabe | 2016-02-29 16:04:43 +0100 | [diff] [blame] | 444 | &ioapic->rtc_status.dest_map); |
Paolo Bonzini | 5678de3f | 2014-03-28 20:41:50 +0100 | [diff] [blame] | 445 | ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret); |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 446 | } else |
| 447 | ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); |
| 448 | |
Paolo Bonzini | 0b10a1c | 2014-03-18 11:51:29 +0100 | [diff] [blame] | 449 | if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG) |
| 450 | entry->fields.remote_irr = 1; |
| 451 | |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 452 | return ret; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 453 | } |
| 454 | |
Michael S. Tsirkin | 1a577b72 | 2012-07-19 13:45:20 +0300 | [diff] [blame] | 455 | int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, |
Yang Zhang | aa2fbe6 | 2013-04-11 19:21:40 +0800 | [diff] [blame] | 456 | int level, bool line_status) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 457 | { |
Michael S. Tsirkin | 28a6fda | 2012-08-14 19:20:28 +0300 | [diff] [blame] | 458 | int ret, irq_level; |
| 459 | |
| 460 | BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 461 | |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 462 | spin_lock(&ioapic->lock); |
Michael S. Tsirkin | 28a6fda | 2012-08-14 19:20:28 +0300 | [diff] [blame] | 463 | irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], |
| 464 | irq_source_id, level); |
Paolo Bonzini | 44847de | 2014-03-18 12:00:14 +0100 | [diff] [blame] | 465 | ret = ioapic_set_irq(ioapic, irq, irq_level, line_status); |
Yang Zhang | 2c2bf01 | 2013-04-11 19:21:41 +0800 | [diff] [blame] | 466 | |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 467 | spin_unlock(&ioapic->lock); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 468 | |
Gleb Natapov | 4925663 | 2009-02-04 17:28:14 +0200 | [diff] [blame] | 469 | return ret; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 470 | } |
| 471 | |
Michael S. Tsirkin | 1a577b72 | 2012-07-19 13:45:20 +0300 | [diff] [blame] | 472 | void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id) |
| 473 | { |
| 474 | int i; |
| 475 | |
| 476 | spin_lock(&ioapic->lock); |
| 477 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) |
| 478 | __clear_bit(irq_source_id, &ioapic->irq_states[i]); |
| 479 | spin_unlock(&ioapic->lock); |
| 480 | } |
| 481 | |
Zhang Haoyu | 184564e | 2014-09-11 16:47:04 +0800 | [diff] [blame] | 482 | static void kvm_ioapic_eoi_inject_work(struct work_struct *work) |
| 483 | { |
| 484 | int i; |
| 485 | struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic, |
| 486 | eoi_inject.work); |
| 487 | spin_lock(&ioapic->lock); |
| 488 | for (i = 0; i < IOAPIC_NUM_PINS; i++) { |
| 489 | union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; |
| 490 | |
| 491 | if (ent->fields.trig_mode != IOAPIC_LEVEL_TRIG) |
| 492 | continue; |
| 493 | |
| 494 | if (ioapic->irr & (1 << i) && !ent->fields.remote_irr) |
| 495 | ioapic_service(ioapic, i, false); |
| 496 | } |
| 497 | spin_unlock(&ioapic->lock); |
| 498 | } |
| 499 | |
| 500 | #define IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT 10000 |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 501 | static void kvm_ioapic_update_eoi_one(struct kvm_vcpu *vcpu, |
| 502 | struct kvm_ioapic *ioapic, |
| 503 | int trigger_mode, |
| 504 | int pin) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 505 | { |
Radim Krčmář | c806a6a | 2015-03-18 19:38:22 +0100 | [diff] [blame] | 506 | struct kvm_lapic *apic = vcpu->arch.apic; |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 507 | union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[pin]; |
Joerg Roedel | 4d99ba8 | 2016-02-29 16:04:45 +0100 | [diff] [blame] | 508 | |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 509 | /* |
| 510 | * We are dropping lock while calling ack notifiers because ack |
| 511 | * notifier callbacks for assigned devices call into IOAPIC |
| 512 | * recursively. Since remote_irr is cleared only after call |
| 513 | * to notifiers if the same vector will be delivered while lock |
| 514 | * is dropped it will be put into irr and will be delivered |
| 515 | * after ack notifier returns. |
| 516 | */ |
| 517 | spin_unlock(&ioapic->lock); |
| 518 | kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, pin); |
| 519 | spin_lock(&ioapic->lock); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 520 | |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 521 | if (trigger_mode != IOAPIC_LEVEL_TRIG || |
| 522 | kvm_lapic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) |
| 523 | return; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 524 | |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 525 | ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG); |
| 526 | ent->fields.remote_irr = 0; |
| 527 | if (!ent->fields.mask && (ioapic->irr & (1 << pin))) { |
| 528 | ++ioapic->irq_eoi[pin]; |
| 529 | if (ioapic->irq_eoi[pin] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) { |
| 530 | /* |
| 531 | * Real hardware does not deliver the interrupt |
| 532 | * immediately during eoi broadcast, and this |
| 533 | * lets a buggy guest make slow progress |
| 534 | * even if it does not correctly handle a |
| 535 | * level-triggered interrupt. Emulate this |
| 536 | * behavior if we detect an interrupt storm. |
| 537 | */ |
| 538 | schedule_delayed_work(&ioapic->eoi_inject, HZ / 100); |
| 539 | ioapic->irq_eoi[pin] = 0; |
| 540 | trace_kvm_ioapic_delayed_eoi_inj(ent->bits); |
Zhang Haoyu | 184564e | 2014-09-11 16:47:04 +0800 | [diff] [blame] | 541 | } else { |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 542 | ioapic_service(ioapic, pin, false); |
Zhang Haoyu | 184564e | 2014-09-11 16:47:04 +0800 | [diff] [blame] | 543 | } |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 544 | } else { |
| 545 | ioapic->irq_eoi[pin] = 0; |
Marcelo Tosatti | f524472 | 2008-07-26 17:01:00 -0300 | [diff] [blame] | 546 | } |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 547 | } |
| 548 | |
Yang Zhang | 1fcc789 | 2013-04-11 19:21:35 +0800 | [diff] [blame] | 549 | void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode) |
Avi Kivity | 4fa6b9c | 2008-06-17 15:36:36 -0700 | [diff] [blame] | 550 | { |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 551 | int i; |
Yang Zhang | 1fcc789 | 2013-04-11 19:21:35 +0800 | [diff] [blame] | 552 | struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; |
Avi Kivity | 4fa6b9c | 2008-06-17 15:36:36 -0700 | [diff] [blame] | 553 | |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 554 | spin_lock(&ioapic->lock); |
Suravee Suthikulpanit | 1ec2405 | 2019-11-14 14:15:18 -0600 | [diff] [blame] | 555 | rtc_irq_eoi(ioapic, vcpu, vector); |
| 556 | for (i = 0; i < IOAPIC_NUM_PINS; i++) { |
| 557 | union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; |
| 558 | |
| 559 | if (ent->fields.vector != vector) |
| 560 | continue; |
| 561 | kvm_ioapic_update_eoi_one(vcpu, ioapic, trigger_mode, i); |
| 562 | } |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 563 | spin_unlock(&ioapic->lock); |
Avi Kivity | 4fa6b9c | 2008-06-17 15:36:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
Gregory Haskins | d76685c4 | 2009-06-01 12:54:50 -0400 | [diff] [blame] | 566 | static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev) |
| 567 | { |
| 568 | return container_of(dev, struct kvm_ioapic, dev); |
| 569 | } |
| 570 | |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 571 | static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 572 | { |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 573 | return ((addr >= ioapic->base_address && |
| 574 | (addr < ioapic->base_address + IOAPIC_MEM_LENGTH))); |
| 575 | } |
| 576 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 577 | static int ioapic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this, |
| 578 | gpa_t addr, int len, void *val) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 579 | { |
Gregory Haskins | d76685c4 | 2009-06-01 12:54:50 -0400 | [diff] [blame] | 580 | struct kvm_ioapic *ioapic = to_ioapic(this); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 581 | u32 result; |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 582 | if (!ioapic_in_range(ioapic, addr)) |
| 583 | return -EOPNOTSUPP; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 584 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 585 | ASSERT(!(addr & 0xf)); /* check alignment */ |
| 586 | |
| 587 | addr &= 0xff; |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 588 | spin_lock(&ioapic->lock); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 589 | switch (addr) { |
| 590 | case IOAPIC_REG_SELECT: |
| 591 | result = ioapic->ioregsel; |
| 592 | break; |
| 593 | |
| 594 | case IOAPIC_REG_WINDOW: |
Jinrong Liang | 019024e5 | 2022-01-25 17:59:03 +0800 | [diff] [blame] | 595 | result = ioapic_read_indirect(ioapic); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 596 | break; |
| 597 | |
| 598 | default: |
| 599 | result = 0; |
| 600 | break; |
| 601 | } |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 602 | spin_unlock(&ioapic->lock); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 603 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 604 | switch (len) { |
| 605 | case 8: |
| 606 | *(u64 *) val = result; |
| 607 | break; |
| 608 | case 1: |
| 609 | case 2: |
| 610 | case 4: |
| 611 | memcpy(val, (char *)&result, len); |
| 612 | break; |
| 613 | default: |
| 614 | printk(KERN_WARNING "ioapic: wrong length %d\n", len); |
| 615 | } |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 616 | return 0; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 617 | } |
| 618 | |
Nikolay Nikolaev | e32edf4 | 2015-03-26 14:39:28 +0000 | [diff] [blame] | 619 | static int ioapic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this, |
| 620 | gpa_t addr, int len, const void *val) |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 621 | { |
Gregory Haskins | d76685c4 | 2009-06-01 12:54:50 -0400 | [diff] [blame] | 622 | struct kvm_ioapic *ioapic = to_ioapic(this); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 623 | u32 data; |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 624 | if (!ioapic_in_range(ioapic, addr)) |
| 625 | return -EOPNOTSUPP; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 626 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 627 | ASSERT(!(addr & 0xf)); /* check alignment */ |
Marcelo Tosatti | 60eead7 | 2009-06-04 15:08:23 -0300 | [diff] [blame] | 628 | |
Julian Stecklina | d77fe63 | 2011-11-23 13:54:30 +0100 | [diff] [blame] | 629 | switch (len) { |
| 630 | case 8: |
| 631 | case 4: |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 632 | data = *(u32 *) val; |
Julian Stecklina | d77fe63 | 2011-11-23 13:54:30 +0100 | [diff] [blame] | 633 | break; |
| 634 | case 2: |
| 635 | data = *(u16 *) val; |
| 636 | break; |
| 637 | case 1: |
| 638 | data = *(u8 *) val; |
| 639 | break; |
| 640 | default: |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 641 | printk(KERN_WARNING "ioapic: Unsupported size %d\n", len); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 642 | return 0; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | addr &= 0xff; |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 646 | spin_lock(&ioapic->lock); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 647 | switch (addr) { |
| 648 | case IOAPIC_REG_SELECT: |
Julian Stecklina | d77fe63 | 2011-11-23 13:54:30 +0100 | [diff] [blame] | 649 | ioapic->ioregsel = data & 0xFF; /* 8-bit register */ |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 650 | break; |
| 651 | |
| 652 | case IOAPIC_REG_WINDOW: |
| 653 | ioapic_write_indirect(ioapic, data); |
| 654 | break; |
| 655 | |
| 656 | default: |
| 657 | break; |
| 658 | } |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 659 | spin_unlock(&ioapic->lock); |
Michael S. Tsirkin | bda9020 | 2009-06-29 22:24:32 +0300 | [diff] [blame] | 660 | return 0; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 661 | } |
| 662 | |
Stephen Hemminger | 7940876 | 2013-12-29 12:12:29 -0800 | [diff] [blame] | 663 | static void kvm_ioapic_reset(struct kvm_ioapic *ioapic) |
Eddie Dong | 8c39269 | 2007-10-10 12:15:54 +0200 | [diff] [blame] | 664 | { |
| 665 | int i; |
| 666 | |
Zhang Haoyu | 184564e | 2014-09-11 16:47:04 +0800 | [diff] [blame] | 667 | cancel_delayed_work_sync(&ioapic->eoi_inject); |
Eddie Dong | 8c39269 | 2007-10-10 12:15:54 +0200 | [diff] [blame] | 668 | for (i = 0; i < IOAPIC_NUM_PINS; i++) |
| 669 | ioapic->redirtbl[i].fields.mask = 1; |
| 670 | ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; |
| 671 | ioapic->ioregsel = 0; |
| 672 | ioapic->irr = 0; |
Wincy Van | 5bda6ee | 2014-12-24 11:14:29 +0800 | [diff] [blame] | 673 | ioapic->irr_delivered = 0; |
Eddie Dong | 8c39269 | 2007-10-10 12:15:54 +0200 | [diff] [blame] | 674 | ioapic->id = 0; |
Jiri Slaby | 8678654 | 2016-10-13 17:45:20 +0200 | [diff] [blame] | 675 | memset(ioapic->irq_eoi, 0x00, sizeof(ioapic->irq_eoi)); |
Yang Zhang | 1060691 | 2013-04-11 19:21:38 +0800 | [diff] [blame] | 676 | rtc_irq_eoi_tracking_reset(ioapic); |
Eddie Dong | 8c39269 | 2007-10-10 12:15:54 +0200 | [diff] [blame] | 677 | } |
| 678 | |
Gregory Haskins | d76685c4 | 2009-06-01 12:54:50 -0400 | [diff] [blame] | 679 | static const struct kvm_io_device_ops ioapic_mmio_ops = { |
| 680 | .read = ioapic_mmio_read, |
| 681 | .write = ioapic_mmio_write, |
Gregory Haskins | d76685c4 | 2009-06-01 12:54:50 -0400 | [diff] [blame] | 682 | }; |
| 683 | |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 684 | int kvm_ioapic_init(struct kvm *kvm) |
| 685 | { |
| 686 | struct kvm_ioapic *ioapic; |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 687 | int ret; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 688 | |
Ben Gardon | 254272c | 2019-02-11 11:02:50 -0800 | [diff] [blame] | 689 | ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL_ACCOUNT); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 690 | if (!ioapic) |
| 691 | return -ENOMEM; |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 692 | spin_lock_init(&ioapic->lock); |
Zhang Haoyu | 184564e | 2014-09-11 16:47:04 +0800 | [diff] [blame] | 693 | INIT_DELAYED_WORK(&ioapic->eoi_inject, kvm_ioapic_eoi_inject_work); |
Zhang Xiantao | d7deeeb0 | 2007-12-14 10:17:34 +0800 | [diff] [blame] | 694 | kvm->arch.vioapic = ioapic; |
Eddie Dong | 8c39269 | 2007-10-10 12:15:54 +0200 | [diff] [blame] | 695 | kvm_ioapic_reset(ioapic); |
Gregory Haskins | d76685c4 | 2009-06-01 12:54:50 -0400 | [diff] [blame] | 696 | kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 697 | ioapic->kvm = kvm; |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 698 | mutex_lock(&kvm->slots_lock); |
Sasha Levin | 743eeb0 | 2011-07-27 16:00:48 +0300 | [diff] [blame] | 699 | ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address, |
| 700 | IOAPIC_MEM_LENGTH, &ioapic->dev); |
Marcelo Tosatti | 79fac95 | 2009-12-23 14:35:26 -0200 | [diff] [blame] | 701 | mutex_unlock(&kvm->slots_lock); |
Wei Yongjun | 1ae77ba | 2010-02-09 10:31:09 +0800 | [diff] [blame] | 702 | if (ret < 0) { |
| 703 | kvm->arch.vioapic = NULL; |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 704 | kfree(ioapic); |
Wei Yongjun | 1ae77ba | 2010-02-09 10:31:09 +0800 | [diff] [blame] | 705 | } |
Gregory Haskins | 090b7af | 2009-07-07 17:08:44 -0400 | [diff] [blame] | 706 | |
| 707 | return ret; |
Eddie Dong | 1fd4f2a | 2007-07-18 12:03:39 +0300 | [diff] [blame] | 708 | } |
Avi Kivity | 75858a8 | 2009-01-04 17:10:50 +0200 | [diff] [blame] | 709 | |
Wei Yongjun | 72bb2fc | 2010-02-09 10:33:03 +0800 | [diff] [blame] | 710 | void kvm_ioapic_destroy(struct kvm *kvm) |
| 711 | { |
| 712 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; |
| 713 | |
Peter Xu | 950712e | 2017-03-15 16:01:18 +0800 | [diff] [blame] | 714 | if (!ioapic) |
| 715 | return; |
| 716 | |
Zhang Haoyu | 184564e | 2014-09-11 16:47:04 +0800 | [diff] [blame] | 717 | cancel_delayed_work_sync(&ioapic->eoi_inject); |
David Hildenbrand | 49f520b | 2017-04-07 10:50:29 +0200 | [diff] [blame] | 718 | mutex_lock(&kvm->slots_lock); |
Julia Lawall | d90e3a3 | 2015-04-27 22:35:34 +0200 | [diff] [blame] | 719 | kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); |
David Hildenbrand | 49f520b | 2017-04-07 10:50:29 +0200 | [diff] [blame] | 720 | mutex_unlock(&kvm->slots_lock); |
Julia Lawall | d90e3a3 | 2015-04-27 22:35:34 +0200 | [diff] [blame] | 721 | kvm->arch.vioapic = NULL; |
| 722 | kfree(ioapic); |
Wei Yongjun | 72bb2fc | 2010-02-09 10:33:03 +0800 | [diff] [blame] | 723 | } |
| 724 | |
David Hildenbrand | 33392b4 | 2017-04-07 10:50:27 +0200 | [diff] [blame] | 725 | void kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 726 | { |
David Hildenbrand | 0191e92 | 2017-04-07 10:50:24 +0200 | [diff] [blame] | 727 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 728 | |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 729 | spin_lock(&ioapic->lock); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 730 | memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); |
Wincy Van | 5bda6ee | 2014-12-24 11:14:29 +0800 | [diff] [blame] | 731 | state->irr &= ~ioapic->irr_delivered; |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 732 | spin_unlock(&ioapic->lock); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 733 | } |
| 734 | |
David Hildenbrand | 33392b4 | 2017-04-07 10:50:27 +0200 | [diff] [blame] | 735 | void kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 736 | { |
David Hildenbrand | 0191e92 | 2017-04-07 10:50:24 +0200 | [diff] [blame] | 737 | struct kvm_ioapic *ioapic = kvm->arch.vioapic; |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 738 | |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 739 | spin_lock(&ioapic->lock); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 740 | memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); |
Paolo Bonzini | 673f7b4 | 2014-03-18 11:39:23 +0100 | [diff] [blame] | 741 | ioapic->irr = 0; |
Wincy Van | 5bda6ee | 2014-12-24 11:14:29 +0800 | [diff] [blame] | 742 | ioapic->irr_delivered = 0; |
David Hildenbrand | ca8ab3f | 2017-04-07 10:50:32 +0200 | [diff] [blame] | 743 | kvm_make_scan_ioapic_request(kvm); |
Paolo Bonzini | 673f7b4 | 2014-03-18 11:39:23 +0100 | [diff] [blame] | 744 | kvm_ioapic_inject_all(ioapic, state->irr); |
Marcelo Tosatti | 46a47b1 | 2010-04-23 14:03:38 -0300 | [diff] [blame] | 745 | spin_unlock(&ioapic->lock); |
Gleb Natapov | eba0226 | 2009-08-24 11:54:25 +0300 | [diff] [blame] | 746 | } |