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 /* Must be called with the kvm lock held */ 1889ed24f4bSMarc Zyngier void vgic_v4_configure_vsgis(struct kvm *kvm) 1899ed24f4bSMarc Zyngier { 1909ed24f4bSMarc Zyngier struct vgic_dist *dist = &kvm->arch.vgic; 1919ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 1929ed24f4bSMarc Zyngier int i; 1939ed24f4bSMarc Zyngier 1949ed24f4bSMarc Zyngier kvm_arm_halt_guest(kvm); 1959ed24f4bSMarc Zyngier 1969ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) { 1979ed24f4bSMarc Zyngier if (dist->nassgireq) 1989ed24f4bSMarc Zyngier vgic_v4_enable_vsgis(vcpu); 1999ed24f4bSMarc Zyngier else 2009ed24f4bSMarc Zyngier vgic_v4_disable_vsgis(vcpu); 2019ed24f4bSMarc Zyngier } 2029ed24f4bSMarc Zyngier 2039ed24f4bSMarc Zyngier kvm_arm_resume_guest(kvm); 2049ed24f4bSMarc Zyngier } 2059ed24f4bSMarc Zyngier 2069ed24f4bSMarc Zyngier /** 2079ed24f4bSMarc Zyngier * vgic_v4_init - Initialize the GICv4 data structures 2089ed24f4bSMarc Zyngier * @kvm: Pointer to the VM being initialized 2099ed24f4bSMarc Zyngier * 2109ed24f4bSMarc Zyngier * We may be called each time a vITS is created, or when the 2119ed24f4bSMarc Zyngier * vgic is initialized. This relies on kvm->lock to be 2129ed24f4bSMarc Zyngier * held. In both cases, the number of vcpus should now be 2139ed24f4bSMarc Zyngier * fixed. 2149ed24f4bSMarc Zyngier */ 2159ed24f4bSMarc Zyngier int vgic_v4_init(struct kvm *kvm) 2169ed24f4bSMarc Zyngier { 2179ed24f4bSMarc Zyngier struct vgic_dist *dist = &kvm->arch.vgic; 2189ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 2199ed24f4bSMarc Zyngier int i, nr_vcpus, ret; 2209ed24f4bSMarc Zyngier 2219ed24f4bSMarc Zyngier if (!kvm_vgic_global_state.has_gicv4) 2229ed24f4bSMarc Zyngier return 0; /* Nothing to see here... move along. */ 2239ed24f4bSMarc Zyngier 2249ed24f4bSMarc Zyngier if (dist->its_vm.vpes) 2259ed24f4bSMarc Zyngier return 0; 2269ed24f4bSMarc Zyngier 2279ed24f4bSMarc Zyngier nr_vcpus = atomic_read(&kvm->online_vcpus); 2289ed24f4bSMarc Zyngier 2299ed24f4bSMarc Zyngier dist->its_vm.vpes = kcalloc(nr_vcpus, sizeof(*dist->its_vm.vpes), 2309ed24f4bSMarc Zyngier GFP_KERNEL); 2319ed24f4bSMarc Zyngier if (!dist->its_vm.vpes) 2329ed24f4bSMarc Zyngier return -ENOMEM; 2339ed24f4bSMarc Zyngier 2349ed24f4bSMarc Zyngier dist->its_vm.nr_vpes = nr_vcpus; 2359ed24f4bSMarc Zyngier 2369ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) 2379ed24f4bSMarc Zyngier dist->its_vm.vpes[i] = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 2389ed24f4bSMarc Zyngier 2399ed24f4bSMarc Zyngier ret = its_alloc_vcpu_irqs(&dist->its_vm); 2409ed24f4bSMarc Zyngier if (ret < 0) { 2419ed24f4bSMarc Zyngier kvm_err("VPE IRQ allocation failure\n"); 2429ed24f4bSMarc Zyngier kfree(dist->its_vm.vpes); 2439ed24f4bSMarc Zyngier dist->its_vm.nr_vpes = 0; 2449ed24f4bSMarc Zyngier dist->its_vm.vpes = NULL; 2459ed24f4bSMarc Zyngier return ret; 2469ed24f4bSMarc Zyngier } 2479ed24f4bSMarc Zyngier 2489ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) { 2499ed24f4bSMarc Zyngier int irq = dist->its_vm.vpes[i]->irq; 2509ed24f4bSMarc Zyngier unsigned long irq_flags = DB_IRQ_FLAGS; 2519ed24f4bSMarc Zyngier 2529ed24f4bSMarc Zyngier /* 2539ed24f4bSMarc Zyngier * Don't automatically enable the doorbell, as we're 2549ed24f4bSMarc Zyngier * flipping it back and forth when the vcpu gets 2559ed24f4bSMarc Zyngier * blocked. Also disable the lazy disabling, as the 2569ed24f4bSMarc Zyngier * doorbell could kick us out of the guest too 2579ed24f4bSMarc Zyngier * early... 2589ed24f4bSMarc Zyngier * 2599ed24f4bSMarc Zyngier * On GICv4.1, the doorbell is managed in HW and must 2609ed24f4bSMarc Zyngier * be left enabled. 2619ed24f4bSMarc Zyngier */ 2629ed24f4bSMarc Zyngier if (kvm_vgic_global_state.has_gicv4_1) 2639ed24f4bSMarc Zyngier irq_flags &= ~IRQ_NOAUTOEN; 2649ed24f4bSMarc Zyngier irq_set_status_flags(irq, irq_flags); 2659ed24f4bSMarc Zyngier 2669ed24f4bSMarc Zyngier ret = request_irq(irq, vgic_v4_doorbell_handler, 2679ed24f4bSMarc Zyngier 0, "vcpu", vcpu); 2689ed24f4bSMarc Zyngier if (ret) { 2699ed24f4bSMarc Zyngier kvm_err("failed to allocate vcpu IRQ%d\n", irq); 2709ed24f4bSMarc Zyngier /* 2719ed24f4bSMarc Zyngier * Trick: adjust the number of vpes so we know 2729ed24f4bSMarc Zyngier * how many to nuke on teardown... 2739ed24f4bSMarc Zyngier */ 2749ed24f4bSMarc Zyngier dist->its_vm.nr_vpes = i; 2759ed24f4bSMarc Zyngier break; 2769ed24f4bSMarc Zyngier } 2779ed24f4bSMarc Zyngier } 2789ed24f4bSMarc Zyngier 2799ed24f4bSMarc Zyngier if (ret) 2809ed24f4bSMarc Zyngier vgic_v4_teardown(kvm); 2819ed24f4bSMarc Zyngier 2829ed24f4bSMarc Zyngier return ret; 2839ed24f4bSMarc Zyngier } 2849ed24f4bSMarc Zyngier 2859ed24f4bSMarc Zyngier /** 2869ed24f4bSMarc Zyngier * vgic_v4_teardown - Free the GICv4 data structures 2879ed24f4bSMarc Zyngier * @kvm: Pointer to the VM being destroyed 2889ed24f4bSMarc Zyngier * 2899ed24f4bSMarc Zyngier * Relies on kvm->lock to be held. 2909ed24f4bSMarc Zyngier */ 2919ed24f4bSMarc Zyngier void vgic_v4_teardown(struct kvm *kvm) 2929ed24f4bSMarc Zyngier { 2939ed24f4bSMarc Zyngier struct its_vm *its_vm = &kvm->arch.vgic.its_vm; 2949ed24f4bSMarc Zyngier int i; 2959ed24f4bSMarc Zyngier 2969ed24f4bSMarc Zyngier if (!its_vm->vpes) 2979ed24f4bSMarc Zyngier return; 2989ed24f4bSMarc Zyngier 2999ed24f4bSMarc Zyngier for (i = 0; i < its_vm->nr_vpes; i++) { 3009ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, i); 3019ed24f4bSMarc Zyngier int irq = its_vm->vpes[i]->irq; 3029ed24f4bSMarc Zyngier 3039ed24f4bSMarc Zyngier irq_clear_status_flags(irq, DB_IRQ_FLAGS); 3049ed24f4bSMarc Zyngier free_irq(irq, vcpu); 3059ed24f4bSMarc Zyngier } 3069ed24f4bSMarc Zyngier 3079ed24f4bSMarc Zyngier its_free_vcpu_irqs(its_vm); 3089ed24f4bSMarc Zyngier kfree(its_vm->vpes); 3099ed24f4bSMarc Zyngier its_vm->nr_vpes = 0; 3109ed24f4bSMarc Zyngier its_vm->vpes = NULL; 3119ed24f4bSMarc Zyngier } 3129ed24f4bSMarc Zyngier 3139ed24f4bSMarc Zyngier int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db) 3149ed24f4bSMarc Zyngier { 3159ed24f4bSMarc Zyngier struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 3169ed24f4bSMarc Zyngier 3179ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(vcpu->kvm) || !vpe->resident) 3189ed24f4bSMarc Zyngier return 0; 3199ed24f4bSMarc Zyngier 3209ed24f4bSMarc Zyngier return its_make_vpe_non_resident(vpe, need_db); 3219ed24f4bSMarc Zyngier } 3229ed24f4bSMarc Zyngier 3239ed24f4bSMarc Zyngier int vgic_v4_load(struct kvm_vcpu *vcpu) 3249ed24f4bSMarc Zyngier { 3259ed24f4bSMarc Zyngier struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; 3269ed24f4bSMarc Zyngier int err; 3279ed24f4bSMarc Zyngier 3289ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(vcpu->kvm) || vpe->resident) 3299ed24f4bSMarc Zyngier return 0; 3309ed24f4bSMarc Zyngier 3319ed24f4bSMarc Zyngier /* 3329ed24f4bSMarc Zyngier * Before making the VPE resident, make sure the redistributor 3339ed24f4bSMarc Zyngier * corresponding to our current CPU expects us here. See the 3349ed24f4bSMarc Zyngier * doc in drivers/irqchip/irq-gic-v4.c to understand how this 3359ed24f4bSMarc Zyngier * turns into a VMOVP command at the ITS level. 3369ed24f4bSMarc Zyngier */ 3379ed24f4bSMarc Zyngier err = irq_set_affinity(vpe->irq, cpumask_of(smp_processor_id())); 3389ed24f4bSMarc Zyngier if (err) 3399ed24f4bSMarc Zyngier return err; 3409ed24f4bSMarc Zyngier 3419ed24f4bSMarc Zyngier err = its_make_vpe_resident(vpe, false, vcpu->kvm->arch.vgic.enabled); 3429ed24f4bSMarc Zyngier if (err) 3439ed24f4bSMarc Zyngier return err; 3449ed24f4bSMarc Zyngier 3459ed24f4bSMarc Zyngier /* 3469ed24f4bSMarc Zyngier * Now that the VPE is resident, let's get rid of a potential 3479ed24f4bSMarc Zyngier * doorbell interrupt that would still be pending. This is a 3489ed24f4bSMarc Zyngier * GICv4.0 only "feature"... 3499ed24f4bSMarc Zyngier */ 3509ed24f4bSMarc Zyngier if (!kvm_vgic_global_state.has_gicv4_1) 3519ed24f4bSMarc Zyngier err = irq_set_irqchip_state(vpe->irq, IRQCHIP_STATE_PENDING, false); 3529ed24f4bSMarc Zyngier 3539ed24f4bSMarc Zyngier return err; 3549ed24f4bSMarc Zyngier } 3559ed24f4bSMarc Zyngier 3569ed24f4bSMarc Zyngier static struct vgic_its *vgic_get_its(struct kvm *kvm, 3579ed24f4bSMarc Zyngier struct kvm_kernel_irq_routing_entry *irq_entry) 3589ed24f4bSMarc Zyngier { 3599ed24f4bSMarc Zyngier struct kvm_msi msi = (struct kvm_msi) { 3609ed24f4bSMarc Zyngier .address_lo = irq_entry->msi.address_lo, 3619ed24f4bSMarc Zyngier .address_hi = irq_entry->msi.address_hi, 3629ed24f4bSMarc Zyngier .data = irq_entry->msi.data, 3639ed24f4bSMarc Zyngier .flags = irq_entry->msi.flags, 3649ed24f4bSMarc Zyngier .devid = irq_entry->msi.devid, 3659ed24f4bSMarc Zyngier }; 3669ed24f4bSMarc Zyngier 3679ed24f4bSMarc Zyngier return vgic_msi_to_its(kvm, &msi); 3689ed24f4bSMarc Zyngier } 3699ed24f4bSMarc Zyngier 3709ed24f4bSMarc Zyngier int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, 3719ed24f4bSMarc Zyngier struct kvm_kernel_irq_routing_entry *irq_entry) 3729ed24f4bSMarc Zyngier { 3739ed24f4bSMarc Zyngier struct vgic_its *its; 3749ed24f4bSMarc Zyngier struct vgic_irq *irq; 3759ed24f4bSMarc Zyngier struct its_vlpi_map map; 3769ed24f4bSMarc Zyngier int ret; 3779ed24f4bSMarc Zyngier 3789ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(kvm)) 3799ed24f4bSMarc Zyngier return 0; 3809ed24f4bSMarc Zyngier 3819ed24f4bSMarc Zyngier /* 3829ed24f4bSMarc Zyngier * Get the ITS, and escape early on error (not a valid 3839ed24f4bSMarc Zyngier * doorbell for any of our vITSs). 3849ed24f4bSMarc Zyngier */ 3859ed24f4bSMarc Zyngier its = vgic_get_its(kvm, irq_entry); 3869ed24f4bSMarc Zyngier if (IS_ERR(its)) 3879ed24f4bSMarc Zyngier return 0; 3889ed24f4bSMarc Zyngier 3899ed24f4bSMarc Zyngier mutex_lock(&its->its_lock); 3909ed24f4bSMarc Zyngier 3919ed24f4bSMarc Zyngier /* Perform the actual DevID/EventID -> LPI translation. */ 3929ed24f4bSMarc Zyngier ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid, 3939ed24f4bSMarc Zyngier irq_entry->msi.data, &irq); 3949ed24f4bSMarc Zyngier if (ret) 3959ed24f4bSMarc Zyngier goto out; 3969ed24f4bSMarc Zyngier 3979ed24f4bSMarc Zyngier /* 3989ed24f4bSMarc Zyngier * Emit the mapping request. If it fails, the ITS probably 3999ed24f4bSMarc Zyngier * isn't v4 compatible, so let's silently bail out. Holding 4009ed24f4bSMarc Zyngier * the ITS lock should ensure that nothing can modify the 4019ed24f4bSMarc Zyngier * target vcpu. 4029ed24f4bSMarc Zyngier */ 4039ed24f4bSMarc Zyngier map = (struct its_vlpi_map) { 4049ed24f4bSMarc Zyngier .vm = &kvm->arch.vgic.its_vm, 4059ed24f4bSMarc Zyngier .vpe = &irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe, 4069ed24f4bSMarc Zyngier .vintid = irq->intid, 4079ed24f4bSMarc Zyngier .properties = ((irq->priority & 0xfc) | 4089ed24f4bSMarc Zyngier (irq->enabled ? LPI_PROP_ENABLED : 0) | 4099ed24f4bSMarc Zyngier LPI_PROP_GROUP1), 4109ed24f4bSMarc Zyngier .db_enabled = true, 4119ed24f4bSMarc Zyngier }; 4129ed24f4bSMarc Zyngier 4139ed24f4bSMarc Zyngier ret = its_map_vlpi(virq, &map); 4149ed24f4bSMarc Zyngier if (ret) 4159ed24f4bSMarc Zyngier goto out; 4169ed24f4bSMarc Zyngier 4179ed24f4bSMarc Zyngier irq->hw = true; 4189ed24f4bSMarc Zyngier irq->host_irq = virq; 4199ed24f4bSMarc Zyngier atomic_inc(&map.vpe->vlpi_count); 4209ed24f4bSMarc Zyngier 4219ed24f4bSMarc Zyngier out: 4229ed24f4bSMarc Zyngier mutex_unlock(&its->its_lock); 4239ed24f4bSMarc Zyngier return ret; 4249ed24f4bSMarc Zyngier } 4259ed24f4bSMarc Zyngier 4269ed24f4bSMarc Zyngier int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int virq, 4279ed24f4bSMarc Zyngier struct kvm_kernel_irq_routing_entry *irq_entry) 4289ed24f4bSMarc Zyngier { 4299ed24f4bSMarc Zyngier struct vgic_its *its; 4309ed24f4bSMarc Zyngier struct vgic_irq *irq; 4319ed24f4bSMarc Zyngier int ret; 4329ed24f4bSMarc Zyngier 4339ed24f4bSMarc Zyngier if (!vgic_supports_direct_msis(kvm)) 4349ed24f4bSMarc Zyngier return 0; 4359ed24f4bSMarc Zyngier 4369ed24f4bSMarc Zyngier /* 4379ed24f4bSMarc Zyngier * Get the ITS, and escape early on error (not a valid 4389ed24f4bSMarc Zyngier * doorbell for any of our vITSs). 4399ed24f4bSMarc Zyngier */ 4409ed24f4bSMarc Zyngier its = vgic_get_its(kvm, irq_entry); 4419ed24f4bSMarc Zyngier if (IS_ERR(its)) 4429ed24f4bSMarc Zyngier return 0; 4439ed24f4bSMarc Zyngier 4449ed24f4bSMarc Zyngier mutex_lock(&its->its_lock); 4459ed24f4bSMarc Zyngier 4469ed24f4bSMarc Zyngier ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid, 4479ed24f4bSMarc Zyngier irq_entry->msi.data, &irq); 4489ed24f4bSMarc Zyngier if (ret) 4499ed24f4bSMarc Zyngier goto out; 4509ed24f4bSMarc Zyngier 4519ed24f4bSMarc Zyngier WARN_ON(!(irq->hw && irq->host_irq == virq)); 4529ed24f4bSMarc Zyngier if (irq->hw) { 4539ed24f4bSMarc Zyngier atomic_dec(&irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count); 4549ed24f4bSMarc Zyngier irq->hw = false; 4559ed24f4bSMarc Zyngier ret = its_unmap_vlpi(virq); 4569ed24f4bSMarc Zyngier } 4579ed24f4bSMarc Zyngier 4589ed24f4bSMarc Zyngier out: 4599ed24f4bSMarc Zyngier mutex_unlock(&its->its_lock); 4609ed24f4bSMarc Zyngier return ret; 4619ed24f4bSMarc Zyngier } 462