xref: /qemu/hw/intc/arm_gicv3_its_kvm.c (revision 05a248715cef192336a594afed812871a52efc1f)
1  /*
2   * KVM-based ITS implementation for a GICv3-based system
3   *
4   * Copyright (c) 2015 Samsung Electronics Co., Ltd.
5   * Written by Pavel Fedin <p.fedin@samsung.com>
6   *
7   * This library is free software; you can redistribute it and/or
8   * modify it under the terms of the GNU Lesser General Public
9   * License as published by the Free Software Foundation; either
10   * version 2.1 of the License, or (at your option) any later version.
11   *
12   * This library is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19   */
20  
21  #include "qemu/osdep.h"
22  #include "qapi/error.h"
23  #include "qemu/module.h"
24  #include "hw/intc/arm_gicv3_its_common.h"
25  #include "hw/qdev-properties.h"
26  #include "sysemu/runstate.h"
27  #include "sysemu/kvm.h"
28  #include "kvm_arm.h"
29  #include "migration/blocker.h"
30  #include "qom/object.h"
31  
32  #define TYPE_KVM_ARM_ITS "arm-its-kvm"
33  typedef struct KVMARMITSClass KVMARMITSClass;
34  /* This is reusing the GICv3ITSState typedef from ARM_GICV3_ITS_COMMON */
35  DECLARE_OBJ_CHECKERS(GICv3ITSState, KVMARMITSClass,
36                       KVM_ARM_ITS, TYPE_KVM_ARM_ITS)
37  
38  struct KVMARMITSClass {
39      GICv3ITSCommonClass parent_class;
40      void (*parent_reset)(DeviceState *dev);
41  };
42  
43  
44  static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid)
45  {
46      struct kvm_msi msi;
47  
48      if (unlikely(!s->translater_gpa_known)) {
49          MemoryRegion *mr = &s->iomem_its_translation;
50          MemoryRegionSection mrs;
51  
52          mrs = memory_region_find(mr, 0, 1);
53          memory_region_unref(mrs.mr);
54          s->gits_translater_gpa = mrs.offset_within_address_space + 0x40;
55          s->translater_gpa_known = true;
56      }
57  
58      msi.address_lo = extract64(s->gits_translater_gpa, 0, 32);
59      msi.address_hi = extract64(s->gits_translater_gpa, 32, 32);
60      msi.data = le32_to_cpu(value);
61      msi.flags = KVM_MSI_VALID_DEVID;
62      msi.devid = devid;
63      memset(msi.pad, 0, sizeof(msi.pad));
64  
65      return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi);
66  }
67  
68  /**
69   * vm_change_state_handler - VM change state callback aiming at flushing
70   * ITS tables into guest RAM
71   *
72   * The tables get flushed to guest RAM whenever the VM gets stopped.
73   */
74  static void vm_change_state_handler(void *opaque, bool running,
75                                      RunState state)
76  {
77      GICv3ITSState *s = (GICv3ITSState *)opaque;
78      Error *err = NULL;
79  
80      if (running) {
81          return;
82      }
83  
84      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
85                        KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err);
86      if (err) {
87          error_report_err(err);
88      }
89  }
90  
91  static void kvm_arm_its_realize(DeviceState *dev, Error **errp)
92  {
93      GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
94  
95      s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false);
96      if (s->dev_fd < 0) {
97          error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS");
98          return;
99      }
100  
101      /* explicit init of the ITS */
102      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
103                        KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort);
104  
105      /* register the base address */
106      kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
107                              KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd, 0);
108  
109      gicv3_its_init_mmio(s, NULL, NULL);
110  
111      if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
112          GITS_CTLR)) {
113          error_setg(&s->migration_blocker, "This operating system kernel "
114                     "does not support vITS migration");
115          if (migrate_add_blocker(s->migration_blocker, errp) < 0) {
116              error_free(s->migration_blocker);
117              return;
118          }
119      } else {
120          qemu_add_vm_change_state_handler(vm_change_state_handler, s);
121      }
122  
123      kvm_msi_use_devid = true;
124      kvm_gsi_direct_mapping = false;
125      kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
126  }
127  
128  /**
129   * kvm_arm_its_pre_save - handles the saving of ITS registers.
130   * ITS tables are flushed into guest RAM separately and earlier,
131   * through the VM change state handler, since at the moment pre_save()
132   * is called, the guest RAM has already been saved.
133   */
134  static void kvm_arm_its_pre_save(GICv3ITSState *s)
135  {
136      int i;
137  
138      for (i = 0; i < 8; i++) {
139          kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
140                            GITS_BASER + i * 8, &s->baser[i], false,
141                            &error_abort);
142      }
143  
144      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
145                        GITS_CTLR, &s->ctlr, false, &error_abort);
146  
147      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
148                        GITS_CBASER, &s->cbaser, false, &error_abort);
149  
150      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
151                        GITS_CREADR, &s->creadr, false, &error_abort);
152  
153      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
154                        GITS_CWRITER, &s->cwriter, false, &error_abort);
155  
156      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
157                        GITS_IIDR, &s->iidr, false, &error_abort);
158  }
159  
160  /**
161   * kvm_arm_its_post_load - Restore both the ITS registers and tables
162   */
163  static void kvm_arm_its_post_load(GICv3ITSState *s)
164  {
165      int i;
166  
167      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
168                        GITS_IIDR, &s->iidr, true, &error_abort);
169  
170      /*
171       * must be written before GITS_CREADR since GITS_CBASER write
172       * access resets GITS_CREADR.
173       */
174      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
175                        GITS_CBASER, &s->cbaser, true, &error_abort);
176  
177      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
178                        GITS_CREADR, &s->creadr, true, &error_abort);
179  
180      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
181                        GITS_CWRITER, &s->cwriter, true, &error_abort);
182  
183  
184      for (i = 0; i < 8; i++) {
185          kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
186                            GITS_BASER + i * 8, &s->baser[i], true,
187                            &error_abort);
188      }
189  
190      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
191                        KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true,
192                        &error_abort);
193  
194      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
195                        GITS_CTLR, &s->ctlr, true, &error_abort);
196  }
197  
198  static void kvm_arm_its_reset(DeviceState *dev)
199  {
200      GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
201      KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s);
202      int i;
203  
204      c->parent_reset(dev);
205  
206      if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
207                                 KVM_DEV_ARM_ITS_CTRL_RESET)) {
208          kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
209                            KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort);
210          return;
211      }
212  
213      warn_report("ITS KVM: full reset is not supported by the host kernel");
214  
215      if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
216                                 GITS_CTLR)) {
217          return;
218      }
219  
220      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
221                        GITS_CTLR, &s->ctlr, true, &error_abort);
222  
223      kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
224                        GITS_CBASER, &s->cbaser, true, &error_abort);
225  
226      for (i = 0; i < 8; i++) {
227          kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
228                            GITS_BASER + i * 8, &s->baser[i], true,
229                            &error_abort);
230      }
231  }
232  
233  static Property kvm_arm_its_props[] = {
234      DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3",
235                       GICv3State *),
236      DEFINE_PROP_END_OF_LIST(),
237  };
238  
239  static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
240  {
241      DeviceClass *dc = DEVICE_CLASS(klass);
242      GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
243      KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass);
244  
245      dc->realize = kvm_arm_its_realize;
246      device_class_set_props(dc, kvm_arm_its_props);
247      device_class_set_parent_reset(dc, kvm_arm_its_reset, &ic->parent_reset);
248      icc->send_msi = kvm_its_send_msi;
249      icc->pre_save = kvm_arm_its_pre_save;
250      icc->post_load = kvm_arm_its_post_load;
251  }
252  
253  static const TypeInfo kvm_arm_its_info = {
254      .name = TYPE_KVM_ARM_ITS,
255      .parent = TYPE_ARM_GICV3_ITS_COMMON,
256      .instance_size = sizeof(GICv3ITSState),
257      .class_init = kvm_arm_its_class_init,
258      .class_size = sizeof(KVMARMITSClass),
259  };
260  
261  static void kvm_arm_its_register_types(void)
262  {
263      type_register_static(&kvm_arm_its_info);
264  }
265  
266  type_init(kvm_arm_its_register_types)
267