19ed24f4bSMarc Zyngier // SPDX-License-Identifier: GPL-2.0-only 29ed24f4bSMarc Zyngier /* 39ed24f4bSMarc Zyngier * Copyright (C) 2017 ARM Ltd. 49ed24f4bSMarc Zyngier * Author: Marc Zyngier <marc.zyngier@arm.com> 59ed24f4bSMarc Zyngier */ 69ed24f4bSMarc Zyngier 79ed24f4bSMarc Zyngier #include <linux/interrupt.h> 89ed24f4bSMarc Zyngier #include <linux/irq.h> 99ed24f4bSMarc Zyngier #include <linux/irqdomain.h> 109ed24f4bSMarc Zyngier #include <linux/kvm_host.h> 119ed24f4bSMarc Zyngier #include <linux/irqchip/arm-gic-v3.h> 129ed24f4bSMarc Zyngier 139ed24f4bSMarc Zyngier #include "vgic.h" 149ed24f4bSMarc Zyngier 159ed24f4bSMarc Zyngier /* 169ed24f4bSMarc Zyngier * How KVM uses GICv4 (insert rude comments here): 179ed24f4bSMarc Zyngier * 189ed24f4bSMarc Zyngier * The vgic-v4 layer acts as a bridge between several entities: 199ed24f4bSMarc Zyngier * - The GICv4 ITS representation offered by the ITS driver 209ed24f4bSMarc Zyngier * - VFIO, which is in charge of the PCI endpoint 219ed24f4bSMarc Zyngier * - The virtual ITS, which is the only thing the guest sees 229ed24f4bSMarc Zyngier * 239ed24f4bSMarc Zyngier * The configuration of VLPIs is triggered by a callback from VFIO, 249ed24f4bSMarc Zyngier * instructing KVM that a PCI device has been configured to deliver 259ed24f4bSMarc Zyngier * MSIs to a vITS. 269ed24f4bSMarc Zyngier * 279ed24f4bSMarc Zyngier * kvm_vgic_v4_set_forwarding() is thus called with the routing entry, 289ed24f4bSMarc Zyngier * and this is used to find the corresponding vITS data structures 299ed24f4bSMarc Zyngier * (ITS instance, device, event and irq) using a process that is 309ed24f4bSMarc Zyngier * extremely similar to the injection of an MSI. 319ed24f4bSMarc Zyngier * 329ed24f4bSMarc Zyngier * At this stage, we can link the guest's view of an LPI (uniquely 339ed24f4bSMarc Zyngier * identified by the routing entry) and the host irq, using the GICv4 349ed24f4bSMarc Zyngier * driver mapping operation. Should the mapping succeed, we've then 359ed24f4bSMarc Zyngier * successfully upgraded the guest's LPI to a VLPI. We can then start 369ed24f4bSMarc Zyngier * with updating GICv4's view of the property table and generating an 379ed24f4bSMarc Zyngier * INValidation in order to kickstart the delivery of this VLPI to the 389ed24f4bSMarc Zyngier * guest directly, without software intervention. Well, almost. 399ed24f4bSMarc Zyngier * 409ed24f4bSMarc Zyngier * When the PCI endpoint is deconfigured, this operation is reversed 419ed24f4bSMarc Zyngier * with VFIO calling kvm_vgic_v4_unset_forwarding(). 429ed24f4bSMarc Zyngier * 439ed24f4bSMarc Zyngier * Once the VLPI has been mapped, it needs to follow any change the 449ed24f4bSMarc Zyngier * guest performs on its LPI through the vITS. For that, a number of 459ed24f4bSMarc Zyngier * command handlers have hooks to communicate these changes to the HW: 469ed24f4bSMarc Zyngier * - Any invalidation triggers a call to its_prop_update_vlpi() 479ed24f4bSMarc Zyngier * - The INT command results in a irq_set_irqchip_state(), which 489ed24f4bSMarc Zyngier * generates an INT on the corresponding VLPI. 499ed24f4bSMarc Zyngier * - The CLEAR command results in a irq_set_irqchip_state(), which 509ed24f4bSMarc Zyngier * generates an CLEAR on the corresponding VLPI. 519ed24f4bSMarc Zyngier * - DISCARD translates into an unmap, similar to a call to 529ed24f4bSMarc Zyngier * kvm_vgic_v4_unset_forwarding(). 539ed24f4bSMarc Zyngier * - MOVI is translated by an update of the existing mapping, changing 549ed24f4bSMarc Zyngier * the target vcpu, resulting in a VMOVI being generated. 559ed24f4bSMarc Zyngier * - MOVALL is translated by a string of mapping updates (similar to 569ed24f4bSMarc Zyngier * the handling of MOVI). MOVALL is horrible. 579ed24f4bSMarc Zyngier * 589ed24f4bSMarc Zyngier * Note that a DISCARD/MAPTI sequence emitted from the guest without 599ed24f4bSMarc Zyngier * reprogramming the PCI endpoint after MAPTI does not result in a 609ed24f4bSMarc Zyngier * VLPI being mapped, as there is no callback from VFIO (the guest 619ed24f4bSMarc Zyngier * will get the interrupt via the normal SW injection). Fixing this is 629ed24f4bSMarc Zyngier * not trivial, and requires some horrible messing with the VFIO 639ed24f4bSMarc Zyngier * internals. Not fun. Don't do that. 649ed24f4bSMarc Zyngier * 659ed24f4bSMarc Zyngier * Then there is the scheduling. Each time a vcpu is about to run on a 669ed24f4bSMarc Zyngier * physical CPU, KVM must tell the corresponding redistributor about 679ed24f4bSMarc Zyngier * it. And if we've migrated our vcpu from one CPU to another, we must 689ed24f4bSMarc Zyngier * tell the ITS (so that the messages reach the right redistributor). 699ed24f4bSMarc Zyngier * This is done in two steps: first issue a irq_set_affinity() on the 709ed24f4bSMarc Zyngier * irq corresponding to the vcpu, then call its_make_vpe_resident(). 719ed24f4bSMarc Zyngier * You must be in a non-preemptible context. On exit, a call to 729ed24f4bSMarc Zyngier * its_make_vpe_non_resident() tells the redistributor that we're done 739ed24f4bSMarc Zyngier * with the vcpu. 749ed24f4bSMarc Zyngier * 759ed24f4bSMarc Zyngier * Finally, the doorbell handling: Each vcpu is allocated an interrupt 769ed24f4bSMarc Zyngier * which will fire each time a VLPI is made pending whilst the vcpu is 779ed24f4bSMarc Zyngier * not running. Each time the vcpu gets blocked, the doorbell 789ed24f4bSMarc Zyngier * interrupt gets enabled. When the vcpu is unblocked (for whatever 799ed24f4bSMarc Zyngier * reason), the doorbell interrupt is disabled. 809ed24f4bSMarc Zyngier */ 819ed24f4bSMarc Zyngier 829ed24f4bSMarc Zyngier #define DB_IRQ_FLAGS (IRQ_NOAUTOEN | IRQ_DISABLE_UNLAZY | IRQ_NO_BALANCING) 839ed24f4bSMarc Zyngier 849ed24f4bSMarc Zyngier static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info) 859ed24f4bSMarc Zyngier { 869ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu = info; 879ed24f4bSMarc Zyngier 889ed24f4bSMarc Zyngier /* We got the message, no need to fire again */ 899ed24f4bSMarc Zyngier if (!kvm_vgic_global_state.has_gicv4_1 && 909ed24f4bSMarc Zyngier !irqd_irq_disabled(&irq_to_desc(irq)->irq_data)) 919ed24f4bSMarc Zyngier disable_irq_nosync(irq); 929ed24f4bSMarc Zyngier 93a3f574cdSMarc Zyngier /* 94a3f574cdSMarc Zyngier * The v4.1 doorbell can fire concurrently with the vPE being 95a3f574cdSMarc Zyngier * made non-resident. Ensure we only update pending_last 96a3f574cdSMarc Zyngier * *after* the non-residency sequence has completed. 97a3f574cdSMarc Zyngier */ 98a3f574cdSMarc Zyngier raw_spin_lock(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vpe_lock); 999ed24f4bSMarc Zyngier vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last = true; 100a3f574cdSMarc Zyngier raw_spin_unlock(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vpe_lock); 101a3f574cdSMarc Zyngier 1029ed24f4bSMarc Zyngier kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu); 1039ed24f4bSMarc Zyngier kvm_vcpu_kick(vcpu); 1049ed24f4bSMarc Zyngier 1059ed24f4bSMarc Zyngier return IRQ_HANDLED; 1069ed24f4bSMarc Zyngier } 1079ed24f4bSMarc Zyngier 1089ed24f4bSMarc Zyngier static void vgic_v4_sync_sgi_config(struct its_vpe *vpe, struct vgic_irq *irq) 1099ed24f4bSMarc Zyngier { 1109ed24f4bSMarc Zyngier vpe->sgi_config[irq->intid].enabled = irq->enabled; 1119ed24f4bSMarc Zyngier vpe->sgi_config[irq->intid].group = irq->group; 1129ed24f4bSMarc Zyngier vpe->sgi_config[irq->intid].priority = irq->priority; 1139ed24f4bSMarc Zyngier } 1149ed24f4bSMarc Zyngier 1159ed24f4bSMarc Zyngier static void vgic_v4_enable_vsgis(struct kvm_vcpu *vcpu) 1169ed24f4bSMarc Zyngier { 1179ed24f4bSMarc Zyngier struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 1189ed24f4bSMarc Zyngier int i; 1199ed24f4bSMarc Zyngier 1209ed24f4bSMarc Zyngier /* 1219ed24f4bSMarc Zyngier * With GICv4.1, every virtual SGI can be directly injected. So 1229ed24f4bSMarc Zyngier * let's pretend that they are HW interrupts, tied to a host 1239ed24f4bSMarc Zyngier * IRQ. The SGI code will do its magic. 1249ed24f4bSMarc Zyngier */ 1259ed24f4bSMarc Zyngier for (i = 0; i < VGIC_NR_SGIS; i++) { 1269ed24f4bSMarc Zyngier struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, i); 1279ed24f4bSMarc Zyngier struct irq_desc *desc; 1289ed24f4bSMarc Zyngier unsigned long flags; 1299ed24f4bSMarc Zyngier int ret; 1309ed24f4bSMarc Zyngier 1319ed24f4bSMarc Zyngier raw_spin_lock_irqsave(&irq->irq_lock, flags); 1329ed24f4bSMarc Zyngier 1339ed24f4bSMarc Zyngier if (irq->hw) 1349ed24f4bSMarc Zyngier goto unlock; 1359ed24f4bSMarc Zyngier 1369ed24f4bSMarc Zyngier irq->hw = true; 1379ed24f4bSMarc Zyngier irq->host_irq = irq_find_mapping(vpe->sgi_domain, i); 1389ed24f4bSMarc Zyngier 1399ed24f4bSMarc Zyngier /* Transfer the full irq state to the vPE */ 1409ed24f4bSMarc Zyngier vgic_v4_sync_sgi_config(vpe, irq); 1419ed24f4bSMarc Zyngier desc = irq_to_desc(irq->host_irq); 1429ed24f4bSMarc Zyngier ret = irq_domain_activate_irq(irq_desc_get_irq_data(desc), 1439ed24f4bSMarc Zyngier false); 1449ed24f4bSMarc Zyngier if (!WARN_ON(ret)) { 1459ed24f4bSMarc Zyngier /* Transfer pending state */ 1469ed24f4bSMarc Zyngier ret = irq_set_irqchip_state(irq->host_irq, 1479ed24f4bSMarc Zyngier IRQCHIP_STATE_PENDING, 1489ed24f4bSMarc Zyngier irq->pending_latch); 1499ed24f4bSMarc Zyngier WARN_ON(ret); 1509ed24f4bSMarc Zyngier irq->pending_latch = false; 1519ed24f4bSMarc Zyngier } 1529ed24f4bSMarc Zyngier unlock: 1539ed24f4bSMarc Zyngier raw_spin_unlock_irqrestore(&irq->irq_lock, flags); 1549ed24f4bSMarc Zyngier vgic_put_irq(vcpu->kvm, irq); 1559ed24f4bSMarc Zyngier } 1569ed24f4bSMarc Zyngier } 1579ed24f4bSMarc Zyngier 1589ed24f4bSMarc Zyngier static void vgic_v4_disable_vsgis(struct kvm_vcpu *vcpu) 1599ed24f4bSMarc Zyngier { 1609ed24f4bSMarc Zyngier int i; 1619ed24f4bSMarc Zyngier 1629ed24f4bSMarc Zyngier for (i = 0; i < VGIC_NR_SGIS; i++) { 1639ed24f4bSMarc Zyngier struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, i); 1649ed24f4bSMarc Zyngier struct irq_desc *desc; 1659ed24f4bSMarc Zyngier unsigned long flags; 1669ed24f4bSMarc Zyngier int ret; 1679ed24f4bSMarc Zyngier 1689ed24f4bSMarc Zyngier raw_spin_lock_irqsave(&irq->irq_lock, flags); 1699ed24f4bSMarc Zyngier 1709ed24f4bSMarc Zyngier if (!irq->hw) 1719ed24f4bSMarc Zyngier goto unlock; 1729ed24f4bSMarc Zyngier 1739ed24f4bSMarc Zyngier irq->hw = false; 1749ed24f4bSMarc Zyngier ret = irq_get_irqchip_state(irq->host_irq, 1759ed24f4bSMarc Zyngier IRQCHIP_STATE_PENDING, 1769ed24f4bSMarc Zyngier &irq->pending_latch); 1779ed24f4bSMarc Zyngier WARN_ON(ret); 1789ed24f4bSMarc Zyngier 1799ed24f4bSMarc Zyngier desc = irq_to_desc(irq->host_irq); 1809ed24f4bSMarc Zyngier irq_domain_deactivate_irq(irq_desc_get_irq_data(desc)); 1819ed24f4bSMarc Zyngier unlock: 1829ed24f4bSMarc Zyngier raw_spin_unlock_irqrestore(&irq->irq_lock, flags); 1839ed24f4bSMarc Zyngier vgic_put_irq(vcpu->kvm, irq); 1849ed24f4bSMarc Zyngier } 1859ed24f4bSMarc Zyngier } 1869ed24f4bSMarc Zyngier 1879ed24f4bSMarc Zyngier void vgic_v4_configure_vsgis(struct kvm *kvm) 1889ed24f4bSMarc Zyngier { 1899ed24f4bSMarc Zyngier struct vgic_dist *dist = &kvm->arch.vgic; 1909ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 19146808a4cSMarc Zyngier unsigned long i; 1929ed24f4bSMarc Zyngier 193*c38b8400SJean-Philippe Brucker lockdep_assert_held(&kvm->arch.config_lock); 194*c38b8400SJean-Philippe Brucker 1959ed24f4bSMarc Zyngier kvm_arm_halt_guest(kvm); 1969ed24f4bSMarc Zyngier 1979ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) { 1989ed24f4bSMarc Zyngier if (dist->nassgireq) 1999ed24f4bSMarc Zyngier vgic_v4_enable_vsgis(vcpu); 2009ed24f4bSMarc Zyngier else 2019ed24f4bSMarc Zyngier vgic_v4_disable_vsgis(vcpu); 2029ed24f4bSMarc Zyngier } 2039ed24f4bSMarc Zyngier 2049ed24f4bSMarc Zyngier kvm_arm_resume_guest(kvm); 2059ed24f4bSMarc Zyngier } 2069ed24f4bSMarc Zyngier 20780317fe4SShenming Lu /* 20880317fe4SShenming Lu * Must be called with GICv4.1 and the vPE unmapped, which 20980317fe4SShenming Lu * indicates the invalidation of any VPT caches associated 21080317fe4SShenming Lu * with the vPE, thus we can get the VLPI state by peeking 21180317fe4SShenming Lu * at the VPT. 21280317fe4SShenming Lu */ 21380317fe4SShenming Lu void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val) 21480317fe4SShenming Lu { 21580317fe4SShenming Lu struct its_vpe *vpe = &irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 21680317fe4SShenming Lu int mask = BIT(irq->intid % BITS_PER_BYTE); 21780317fe4SShenming Lu void *va; 21880317fe4SShenming Lu u8 *ptr; 21980317fe4SShenming Lu 22080317fe4SShenming Lu va = page_address(vpe->vpt_page); 22180317fe4SShenming Lu ptr = va + irq->intid / BITS_PER_BYTE; 22280317fe4SShenming Lu 22380317fe4SShenming Lu *val = !!(*ptr & mask); 22480317fe4SShenming Lu } 22580317fe4SShenming Lu 226ef369168SMarc Zyngier int vgic_v4_request_vpe_irq(struct kvm_vcpu *vcpu, int irq) 227ef369168SMarc Zyngier { 228ef369168SMarc Zyngier return request_irq(irq, vgic_v4_doorbell_handler, 0, "vcpu", vcpu); 229ef369168SMarc Zyngier } 230ef369168SMarc Zyngier 2319ed24f4bSMarc Zyngier /** 2329ed24f4bSMarc Zyngier * vgic_v4_init - Initialize the GICv4 data structures 2339ed24f4bSMarc Zyngier * @kvm: Pointer to the VM being initialized 2349ed24f4bSMarc Zyngier * 2359ed24f4bSMarc Zyngier * We may be called each time a vITS is created, or when the 236f0032773SOliver Upton * vgic is initialized. In both cases, the number of vcpus 237f0032773SOliver Upton * should now be fixed. 2389ed24f4bSMarc Zyngier */ 2399ed24f4bSMarc Zyngier int vgic_v4_init(struct kvm *kvm) 2409ed24f4bSMarc Zyngier { 2419ed24f4bSMarc Zyngier struct vgic_dist *dist = &kvm->arch.vgic; 2429ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 24346808a4cSMarc Zyngier int nr_vcpus, ret; 24446808a4cSMarc Zyngier unsigned long i; 2459ed24f4bSMarc Zyngier 246f0032773SOliver Upton lockdep_assert_held(&kvm->arch.config_lock); 247f0032773SOliver Upton 2489ed24f4bSMarc Zyngier if (!kvm_vgic_global_state.has_gicv4) 2499ed24f4bSMarc Zyngier return 0; /* Nothing to see here... move along. */ 2509ed24f4bSMarc Zyngier 2519ed24f4bSMarc Zyngier if (dist->its_vm.vpes) 2529ed24f4bSMarc Zyngier return 0; 2539ed24f4bSMarc Zyngier 2549ed24f4bSMarc Zyngier nr_vcpus = atomic_read(&kvm->online_vcpus); 2559ed24f4bSMarc Zyngier 2569ed24f4bSMarc Zyngier dist->its_vm.vpes = kcalloc(nr_vcpus, sizeof(*dist->its_vm.vpes), 2573ef23167SJia He GFP_KERNEL_ACCOUNT); 2589ed24f4bSMarc Zyngier if (!dist->its_vm.vpes) 2599ed24f4bSMarc Zyngier return -ENOMEM; 2609ed24f4bSMarc Zyngier 2619ed24f4bSMarc Zyngier dist->its_vm.nr_vpes = nr_vcpus; 2629ed24f4bSMarc Zyngier 2639ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) 2649ed24f4bSMarc Zyngier dist->its_vm.vpes[i] = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 2659ed24f4bSMarc Zyngier 2669ed24f4bSMarc Zyngier ret = its_alloc_vcpu_irqs(&dist->its_vm); 2679ed24f4bSMarc Zyngier if (ret < 0) { 2689ed24f4bSMarc Zyngier kvm_err("VPE IRQ allocation failure\n"); 2699ed24f4bSMarc Zyngier kfree(dist->its_vm.vpes); 2709ed24f4bSMarc Zyngier dist->its_vm.nr_vpes = 0; 2719ed24f4bSMarc Zyngier dist->its_vm.vpes = NULL; 2729ed24f4bSMarc Zyngier return ret; 2739ed24f4bSMarc Zyngier } 2749ed24f4bSMarc Zyngier 2759ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) { 2769ed24f4bSMarc Zyngier int irq = dist->its_vm.vpes[i]->irq; 2779ed24f4bSMarc Zyngier unsigned long irq_flags = DB_IRQ_FLAGS; 2789ed24f4bSMarc Zyngier 2799ed24f4bSMarc Zyngier /* 2809ed24f4bSMarc Zyngier * Don't automatically enable the doorbell, as we're 2819ed24f4bSMarc Zyngier * flipping it back and forth when the vcpu gets 2829ed24f4bSMarc Zyngier * blocked. Also disable the lazy disabling, as the 2839ed24f4bSMarc Zyngier * doorbell could kick us out of the guest too 2849ed24f4bSMarc Zyngier * early... 2859ed24f4bSMarc Zyngier * 2869ed24f4bSMarc Zyngier * On GICv4.1, the doorbell is managed in HW and must 2879ed24f4bSMarc Zyngier * be left enabled. 2889ed24f4bSMarc Zyngier */ 2899ed24f4bSMarc Zyngier if (kvm_vgic_global_state.has_gicv4_1) 2909ed24f4bSMarc Zyngier irq_flags &= ~IRQ_NOAUTOEN; 2919ed24f4bSMarc Zyngier irq_set_status_flags(irq, irq_flags); 2929ed24f4bSMarc Zyngier 293ef369168SMarc Zyngier ret = vgic_v4_request_vpe_irq(vcpu, irq); 2949ed24f4bSMarc Zyngier if (ret) { 2959ed24f4bSMarc Zyngier kvm_err("failed to allocate vcpu IRQ%d\n", irq); 2969ed24f4bSMarc Zyngier /* 2979ed24f4bSMarc Zyngier * Trick: adjust the number of vpes so we know 2989ed24f4bSMarc Zyngier * how many to nuke on teardown... 2999ed24f4bSMarc Zyngier */ 3009ed24f4bSMarc Zyngier dist->its_vm.nr_vpes = i; 3019ed24f4bSMarc Zyngier break; 3029ed24f4bSMarc Zyngier } 3039ed24f4bSMarc Zyngier } 3049ed24f4bSMarc Zyngier 3059ed24f4bSMarc Zyngier if (ret) 3069ed24f4bSMarc Zyngier vgic_v4_teardown(kvm); 3079ed24f4bSMarc Zyngier 3089ed24f4bSMarc Zyngier return ret; 3099ed24f4bSMarc Zyngier } 3109ed24f4bSMarc Zyngier 3119ed24f4bSMarc Zyngier /** 3129ed24f4bSMarc Zyngier * vgic_v4_teardown - Free the GICv4 data structures 3139ed24f4bSMarc Zyngier * @kvm: Pointer to the VM being destroyed 3149ed24f4bSMarc Zyngier */ 3159ed24f4bSMarc Zyngier void vgic_v4_teardown(struct kvm *kvm) 3169ed24f4bSMarc Zyngier { 3179ed24f4bSMarc Zyngier struct its_vm *its_vm = &kvm->arch.vgic.its_vm; 3189ed24f4bSMarc Zyngier int i; 3199ed24f4bSMarc Zyngier 320f0032773SOliver Upton lockdep_assert_held(&kvm->arch.config_lock); 321f0032773SOliver Upton 3229ed24f4bSMarc Zyngier if (!its_vm->vpes) 3239ed24f4bSMarc Zyngier return; 3249ed24f4bSMarc Zyngier 3259ed24f4bSMarc Zyngier for (i = 0; i < its_vm->nr_vpes; i++) { 3269ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, i); 3279ed24f4bSMarc Zyngier int irq = its_vm->vpes[i]->irq; 3289ed24f4bSMarc Zyngier 3299ed24f4bSMarc Zyngier irq_clear_status_flags(irq, DB_IRQ_FLAGS); 3309ed24f4bSMarc Zyngier free_irq(irq, vcpu); 3319ed24f4bSMarc Zyngier } 3329ed24f4bSMarc Zyngier 3339ed24f4bSMarc Zyngier its_free_vcpu_irqs(its_vm); 3349ed24f4bSMarc Zyngier kfree(its_vm->vpes); 3359ed24f4bSMarc Zyngier its_vm->nr_vpes = 0; 3369ed24f4bSMarc Zyngier its_vm->vpes = NULL; 3379ed24f4bSMarc Zyngier } 3389ed24f4bSMarc Zyngier 3399ed24f4bSMarc Zyngier int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db) 3409ed24f4bSMarc Zyngier { 3419ed24f4bSMarc Zyngier struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 3429ed24f4bSMarc Zyngier 3439ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(vcpu->kvm) || !vpe->resident) 3449ed24f4bSMarc Zyngier return 0; 3459ed24f4bSMarc Zyngier 3469ed24f4bSMarc Zyngier return its_make_vpe_non_resident(vpe, need_db); 3479ed24f4bSMarc Zyngier } 3489ed24f4bSMarc Zyngier 3499ed24f4bSMarc Zyngier int vgic_v4_load(struct kvm_vcpu *vcpu) 3509ed24f4bSMarc Zyngier { 3519ed24f4bSMarc Zyngier struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 3529ed24f4bSMarc Zyngier int err; 3539ed24f4bSMarc Zyngier 3549ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(vcpu->kvm) || vpe->resident) 3559ed24f4bSMarc Zyngier return 0; 3569ed24f4bSMarc Zyngier 3579ed24f4bSMarc Zyngier /* 3589ed24f4bSMarc Zyngier * Before making the VPE resident, make sure the redistributor 3599ed24f4bSMarc Zyngier * corresponding to our current CPU expects us here. See the 3609ed24f4bSMarc Zyngier * doc in drivers/irqchip/irq-gic-v4.c to understand how this 3619ed24f4bSMarc Zyngier * turns into a VMOVP command at the ITS level. 3629ed24f4bSMarc Zyngier */ 3639ed24f4bSMarc Zyngier err = irq_set_affinity(vpe->irq, cpumask_of(smp_processor_id())); 3649ed24f4bSMarc Zyngier if (err) 3659ed24f4bSMarc Zyngier return err; 3669ed24f4bSMarc Zyngier 3679ed24f4bSMarc Zyngier err = its_make_vpe_resident(vpe, false, vcpu->kvm->arch.vgic.enabled); 3689ed24f4bSMarc Zyngier if (err) 3699ed24f4bSMarc Zyngier return err; 3709ed24f4bSMarc Zyngier 3719ed24f4bSMarc Zyngier /* 3729ed24f4bSMarc Zyngier * Now that the VPE is resident, let's get rid of a potential 3739ed24f4bSMarc Zyngier * doorbell interrupt that would still be pending. This is a 3749ed24f4bSMarc Zyngier * GICv4.0 only "feature"... 3759ed24f4bSMarc Zyngier */ 3769ed24f4bSMarc Zyngier if (!kvm_vgic_global_state.has_gicv4_1) 3779ed24f4bSMarc Zyngier err = irq_set_irqchip_state(vpe->irq, IRQCHIP_STATE_PENDING, false); 3789ed24f4bSMarc Zyngier 3799ed24f4bSMarc Zyngier return err; 3809ed24f4bSMarc Zyngier } 3819ed24f4bSMarc Zyngier 38257e3cebdSShenming Lu void vgic_v4_commit(struct kvm_vcpu *vcpu) 38357e3cebdSShenming Lu { 38457e3cebdSShenming Lu struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 38557e3cebdSShenming Lu 38657e3cebdSShenming Lu /* 38757e3cebdSShenming Lu * No need to wait for the vPE to be ready across a shallow guest 38857e3cebdSShenming Lu * exit, as only a vcpu_put will invalidate it. 38957e3cebdSShenming Lu */ 39057e3cebdSShenming Lu if (!vpe->ready) 39157e3cebdSShenming Lu its_commit_vpe(vpe); 39257e3cebdSShenming Lu } 39357e3cebdSShenming Lu 3949ed24f4bSMarc Zyngier static struct vgic_its *vgic_get_its(struct kvm *kvm, 3959ed24f4bSMarc Zyngier struct kvm_kernel_irq_routing_entry *irq_entry) 3969ed24f4bSMarc Zyngier { 3979ed24f4bSMarc Zyngier struct kvm_msi msi = (struct kvm_msi) { 3989ed24f4bSMarc Zyngier .address_lo = irq_entry->msi.address_lo, 3999ed24f4bSMarc Zyngier .address_hi = irq_entry->msi.address_hi, 4009ed24f4bSMarc Zyngier .data = irq_entry->msi.data, 4019ed24f4bSMarc Zyngier .flags = irq_entry->msi.flags, 4029ed24f4bSMarc Zyngier .devid = irq_entry->msi.devid, 4039ed24f4bSMarc Zyngier }; 4049ed24f4bSMarc Zyngier 4059ed24f4bSMarc Zyngier return vgic_msi_to_its(kvm, &msi); 4069ed24f4bSMarc Zyngier } 4079ed24f4bSMarc Zyngier 4089ed24f4bSMarc Zyngier int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, 4099ed24f4bSMarc Zyngier struct kvm_kernel_irq_routing_entry *irq_entry) 4109ed24f4bSMarc Zyngier { 4119ed24f4bSMarc Zyngier struct vgic_its *its; 4129ed24f4bSMarc Zyngier struct vgic_irq *irq; 4139ed24f4bSMarc Zyngier struct its_vlpi_map map; 41412df7429SZenghui Yu unsigned long flags; 4159ed24f4bSMarc Zyngier int ret; 4169ed24f4bSMarc Zyngier 4179ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(kvm)) 4189ed24f4bSMarc Zyngier return 0; 4199ed24f4bSMarc Zyngier 4209ed24f4bSMarc Zyngier /* 4219ed24f4bSMarc Zyngier * Get the ITS, and escape early on error (not a valid 4229ed24f4bSMarc Zyngier * doorbell for any of our vITSs). 4239ed24f4bSMarc Zyngier */ 4249ed24f4bSMarc Zyngier its = vgic_get_its(kvm, irq_entry); 4259ed24f4bSMarc Zyngier if (IS_ERR(its)) 4269ed24f4bSMarc Zyngier return 0; 4279ed24f4bSMarc Zyngier 4289ed24f4bSMarc Zyngier mutex_lock(&its->its_lock); 4299ed24f4bSMarc Zyngier 4309ed24f4bSMarc Zyngier /* Perform the actual DevID/EventID -> LPI translation. */ 4319ed24f4bSMarc Zyngier ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid, 4329ed24f4bSMarc Zyngier irq_entry->msi.data, &irq); 4339ed24f4bSMarc Zyngier if (ret) 4349ed24f4bSMarc Zyngier goto out; 4359ed24f4bSMarc Zyngier 4369ed24f4bSMarc Zyngier /* 4379ed24f4bSMarc Zyngier * Emit the mapping request. If it fails, the ITS probably 4389ed24f4bSMarc Zyngier * isn't v4 compatible, so let's silently bail out. Holding 4399ed24f4bSMarc Zyngier * the ITS lock should ensure that nothing can modify the 4409ed24f4bSMarc Zyngier * target vcpu. 4419ed24f4bSMarc Zyngier */ 4429ed24f4bSMarc Zyngier map = (struct its_vlpi_map) { 4439ed24f4bSMarc Zyngier .vm = &kvm->arch.vgic.its_vm, 4449ed24f4bSMarc Zyngier .vpe = &irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe, 4459ed24f4bSMarc Zyngier .vintid = irq->intid, 4469ed24f4bSMarc Zyngier .properties = ((irq->priority & 0xfc) | 4479ed24f4bSMarc Zyngier (irq->enabled ? LPI_PROP_ENABLED : 0) | 4489ed24f4bSMarc Zyngier LPI_PROP_GROUP1), 4499ed24f4bSMarc Zyngier .db_enabled = true, 4509ed24f4bSMarc Zyngier }; 4519ed24f4bSMarc Zyngier 4529ed24f4bSMarc Zyngier ret = its_map_vlpi(virq, &map); 4539ed24f4bSMarc Zyngier if (ret) 4549ed24f4bSMarc Zyngier goto out; 4559ed24f4bSMarc Zyngier 4569ed24f4bSMarc Zyngier irq->hw = true; 4579ed24f4bSMarc Zyngier irq->host_irq = virq; 4589ed24f4bSMarc Zyngier atomic_inc(&map.vpe->vlpi_count); 4599ed24f4bSMarc Zyngier 46012df7429SZenghui Yu /* Transfer pending state */ 46112df7429SZenghui Yu raw_spin_lock_irqsave(&irq->irq_lock, flags); 46212df7429SZenghui Yu if (irq->pending_latch) { 46312df7429SZenghui Yu ret = irq_set_irqchip_state(irq->host_irq, 46412df7429SZenghui Yu IRQCHIP_STATE_PENDING, 46512df7429SZenghui Yu irq->pending_latch); 46612df7429SZenghui Yu WARN_RATELIMIT(ret, "IRQ %d", irq->host_irq); 46712df7429SZenghui Yu 46812df7429SZenghui Yu /* 46912df7429SZenghui Yu * Clear pending_latch and communicate this state 47012df7429SZenghui Yu * change via vgic_queue_irq_unlock. 47112df7429SZenghui Yu */ 47212df7429SZenghui Yu irq->pending_latch = false; 47312df7429SZenghui Yu vgic_queue_irq_unlock(kvm, irq, flags); 47412df7429SZenghui Yu } else { 47512df7429SZenghui Yu raw_spin_unlock_irqrestore(&irq->irq_lock, flags); 47612df7429SZenghui Yu } 47712df7429SZenghui Yu 4789ed24f4bSMarc Zyngier out: 4799ed24f4bSMarc Zyngier mutex_unlock(&its->its_lock); 4809ed24f4bSMarc Zyngier return ret; 4819ed24f4bSMarc Zyngier } 4829ed24f4bSMarc Zyngier 4839ed24f4bSMarc Zyngier int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int virq, 4849ed24f4bSMarc Zyngier struct kvm_kernel_irq_routing_entry *irq_entry) 4859ed24f4bSMarc Zyngier { 4869ed24f4bSMarc Zyngier struct vgic_its *its; 4879ed24f4bSMarc Zyngier struct vgic_irq *irq; 4889ed24f4bSMarc Zyngier int ret; 4899ed24f4bSMarc Zyngier 4909ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(kvm)) 4919ed24f4bSMarc Zyngier return 0; 4929ed24f4bSMarc Zyngier 4939ed24f4bSMarc Zyngier /* 4949ed24f4bSMarc Zyngier * Get the ITS, and escape early on error (not a valid 4959ed24f4bSMarc Zyngier * doorbell for any of our vITSs). 4969ed24f4bSMarc Zyngier */ 4979ed24f4bSMarc Zyngier its = vgic_get_its(kvm, irq_entry); 4989ed24f4bSMarc Zyngier if (IS_ERR(its)) 4999ed24f4bSMarc Zyngier return 0; 5009ed24f4bSMarc Zyngier 5019ed24f4bSMarc Zyngier mutex_lock(&its->its_lock); 5029ed24f4bSMarc Zyngier 5039ed24f4bSMarc Zyngier ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid, 5049ed24f4bSMarc Zyngier irq_entry->msi.data, &irq); 5059ed24f4bSMarc Zyngier if (ret) 5069ed24f4bSMarc Zyngier goto out; 5079ed24f4bSMarc Zyngier 5089ed24f4bSMarc Zyngier WARN_ON(!(irq->hw && irq->host_irq == virq)); 5099ed24f4bSMarc Zyngier if (irq->hw) { 5109ed24f4bSMarc Zyngier atomic_dec(&irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count); 5119ed24f4bSMarc Zyngier irq->hw = false; 5129ed24f4bSMarc Zyngier ret = its_unmap_vlpi(virq); 5139ed24f4bSMarc Zyngier } 5149ed24f4bSMarc Zyngier 5159ed24f4bSMarc Zyngier out: 5169ed24f4bSMarc Zyngier mutex_unlock(&its->its_lock); 5179ed24f4bSMarc Zyngier return ret; 5189ed24f4bSMarc Zyngier } 519