| /* |
| * KVM-based ITS implementation for a GICv3-based system |
| * |
| * Copyright (c) 2015 Samsung Electronics Co., Ltd. |
| * Written by Pavel Fedin <p.fedin@samsung.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qemu/module.h" |
| #include "hw/intc/arm_gicv3_its_common.h" |
| #include "hw/qdev-properties.h" |
| #include "sysemu/runstate.h" |
| #include "sysemu/kvm.h" |
| #include "kvm_arm.h" |
| #include "migration/blocker.h" |
| #include "qom/object.h" |
| |
| #define TYPE_KVM_ARM_ITS "arm-its-kvm" |
| typedef struct KVMARMITSClass KVMARMITSClass; |
| /* This is reusing the GICv3ITSState typedef from ARM_GICV3_ITS_COMMON */ |
| DECLARE_OBJ_CHECKERS(GICv3ITSState, KVMARMITSClass, |
| KVM_ARM_ITS, TYPE_KVM_ARM_ITS) |
| |
| struct KVMARMITSClass { |
| GICv3ITSCommonClass parent_class; |
| void (*parent_reset)(DeviceState *dev); |
| }; |
| |
| |
| static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid) |
| { |
| struct kvm_msi msi; |
| |
| if (unlikely(!s->translater_gpa_known)) { |
| MemoryRegion *mr = &s->iomem_its_translation; |
| MemoryRegionSection mrs; |
| |
| mrs = memory_region_find(mr, 0, 1); |
| memory_region_unref(mrs.mr); |
| s->gits_translater_gpa = mrs.offset_within_address_space + 0x40; |
| s->translater_gpa_known = true; |
| } |
| |
| msi.address_lo = extract64(s->gits_translater_gpa, 0, 32); |
| msi.address_hi = extract64(s->gits_translater_gpa, 32, 32); |
| msi.data = le32_to_cpu(value); |
| msi.flags = KVM_MSI_VALID_DEVID; |
| msi.devid = devid; |
| memset(msi.pad, 0, sizeof(msi.pad)); |
| |
| return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi); |
| } |
| |
| /** |
| * vm_change_state_handler - VM change state callback aiming at flushing |
| * ITS tables into guest RAM |
| * |
| * The tables get flushed to guest RAM whenever the VM gets stopped. |
| */ |
| static void vm_change_state_handler(void *opaque, int running, |
| RunState state) |
| { |
| GICv3ITSState *s = (GICv3ITSState *)opaque; |
| Error *err = NULL; |
| |
| if (running) { |
| return; |
| } |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, |
| KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err); |
| if (err) { |
| error_report_err(err); |
| } |
| } |
| |
| static void kvm_arm_its_realize(DeviceState *dev, Error **errp) |
| { |
| GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); |
| |
| s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false); |
| if (s->dev_fd < 0) { |
| error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS"); |
| return; |
| } |
| |
| /* explicit init of the ITS */ |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, |
| KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort); |
| |
| /* register the base address */ |
| kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, |
| KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd, 0); |
| |
| gicv3_its_init_mmio(s, NULL); |
| |
| if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CTLR)) { |
| error_setg(&s->migration_blocker, "This operating system kernel " |
| "does not support vITS migration"); |
| if (migrate_add_blocker(s->migration_blocker, errp) < 0) { |
| error_free(s->migration_blocker); |
| return; |
| } |
| } else { |
| qemu_add_vm_change_state_handler(vm_change_state_handler, s); |
| } |
| |
| kvm_msi_use_devid = true; |
| kvm_gsi_direct_mapping = false; |
| kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled(); |
| } |
| |
| /** |
| * kvm_arm_its_pre_save - handles the saving of ITS registers. |
| * ITS tables are flushed into guest RAM separately and earlier, |
| * through the VM change state handler, since at the moment pre_save() |
| * is called, the guest RAM has already been saved. |
| */ |
| static void kvm_arm_its_pre_save(GICv3ITSState *s) |
| { |
| int i; |
| |
| for (i = 0; i < 8; i++) { |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_BASER + i * 8, &s->baser[i], false, |
| &error_abort); |
| } |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CTLR, &s->ctlr, false, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CBASER, &s->cbaser, false, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CREADR, &s->creadr, false, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CWRITER, &s->cwriter, false, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_IIDR, &s->iidr, false, &error_abort); |
| } |
| |
| /** |
| * kvm_arm_its_post_load - Restore both the ITS registers and tables |
| */ |
| static void kvm_arm_its_post_load(GICv3ITSState *s) |
| { |
| int i; |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_IIDR, &s->iidr, true, &error_abort); |
| |
| /* |
| * must be written before GITS_CREADR since GITS_CBASER write |
| * access resets GITS_CREADR. |
| */ |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CBASER, &s->cbaser, true, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CREADR, &s->creadr, true, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CWRITER, &s->cwriter, true, &error_abort); |
| |
| |
| for (i = 0; i < 8; i++) { |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_BASER + i * 8, &s->baser[i], true, |
| &error_abort); |
| } |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, |
| KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true, |
| &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CTLR, &s->ctlr, true, &error_abort); |
| } |
| |
| static void kvm_arm_its_reset(DeviceState *dev) |
| { |
| GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); |
| KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s); |
| int i; |
| |
| c->parent_reset(dev); |
| |
| if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, |
| KVM_DEV_ARM_ITS_CTRL_RESET)) { |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, |
| KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort); |
| return; |
| } |
| |
| warn_report("ITS KVM: full reset is not supported by the host kernel"); |
| |
| if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CTLR)) { |
| return; |
| } |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CTLR, &s->ctlr, true, &error_abort); |
| |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_CBASER, &s->cbaser, true, &error_abort); |
| |
| for (i = 0; i < 8; i++) { |
| kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, |
| GITS_BASER + i * 8, &s->baser[i], true, |
| &error_abort); |
| } |
| } |
| |
| static Property kvm_arm_its_props[] = { |
| DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3", |
| GICv3State *), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void kvm_arm_its_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); |
| KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass); |
| |
| dc->realize = kvm_arm_its_realize; |
| device_class_set_props(dc, kvm_arm_its_props); |
| device_class_set_parent_reset(dc, kvm_arm_its_reset, &ic->parent_reset); |
| icc->send_msi = kvm_its_send_msi; |
| icc->pre_save = kvm_arm_its_pre_save; |
| icc->post_load = kvm_arm_its_post_load; |
| } |
| |
| static const TypeInfo kvm_arm_its_info = { |
| .name = TYPE_KVM_ARM_ITS, |
| .parent = TYPE_ARM_GICV3_ITS_COMMON, |
| .instance_size = sizeof(GICv3ITSState), |
| .class_init = kvm_arm_its_class_init, |
| .class_size = sizeof(KVMARMITSClass), |
| }; |
| |
| static void kvm_arm_its_register_types(void) |
| { |
| type_register_static(&kvm_arm_its_info); |
| } |
| |
| type_init(kvm_arm_its_register_types) |