1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015, 2016 ARM Ltd.
7 #include <linux/kvm_host.h>
8 #include <trace/events/kvm.h>
9 #include <kvm/arm_vgic.h>
13 * vgic_irqfd_set_irq: inject the IRQ corresponding to the
14 * irqchip routing entry
16 * This is the entry point for irqfd IRQ injection
18 static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e,
19 struct kvm *kvm, int irq_source_id,
20 int level, bool line_status)
22 unsigned int spi_id = e->irqchip.pin + VGIC_NR_PRIVATE_IRQS;
24 if (!vgic_valid_spi(kvm, spi_id))
26 return kvm_vgic_inject_irq(kvm, NULL, spi_id, level, NULL);
30 * kvm_set_routing_entry: populate a kvm routing entry
31 * from a user routing entry
33 * @kvm: the VM this entry is applied to
34 * @e: kvm kernel routing entry handle
35 * @ue: user api routing entry handle
36 * return 0 on success, -EINVAL on errors.
38 int kvm_set_routing_entry(struct kvm *kvm,
39 struct kvm_kernel_irq_routing_entry *e,
40 const struct kvm_irq_routing_entry *ue)
45 case KVM_IRQ_ROUTING_IRQCHIP:
46 e->set = vgic_irqfd_set_irq;
47 e->irqchip.irqchip = ue->u.irqchip.irqchip;
48 e->irqchip.pin = ue->u.irqchip.pin;
49 if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) ||
50 (e->irqchip.irqchip >= KVM_NR_IRQCHIPS))
53 case KVM_IRQ_ROUTING_MSI:
55 e->msi.address_lo = ue->u.msi.address_lo;
56 e->msi.address_hi = ue->u.msi.address_hi;
57 e->msi.data = ue->u.msi.data;
58 e->msi.flags = ue->flags;
59 e->msi.devid = ue->u.msi.devid;
69 static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e,
72 msi->address_lo = e->msi.address_lo;
73 msi->address_hi = e->msi.address_hi;
74 msi->data = e->msi.data;
75 msi->flags = e->msi.flags;
76 msi->devid = e->msi.devid;
79 * kvm_set_msi: inject the MSI corresponding to the
82 * This is the entry point for irqfd MSI injection
83 * and userspace MSI injection.
85 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
86 struct kvm *kvm, int irq_source_id,
87 int level, bool line_status)
91 if (!vgic_has_its(kvm))
97 kvm_populate_msi(e, &msi);
98 return vgic_its_inject_msi(kvm, &msi);
102 * kvm_arch_set_irq_inatomic: fast-path for irqfd injection
104 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
105 struct kvm *kvm, int irq_source_id, int level,
112 case KVM_IRQ_ROUTING_MSI: {
115 if (!vgic_has_its(kvm))
118 kvm_populate_msi(e, &msi);
119 return vgic_its_inject_cached_translation(kvm, &msi);
122 case KVM_IRQ_ROUTING_IRQCHIP:
124 * Injecting SPIs is always possible in atomic context
125 * as long as the damn vgic is initialized.
127 if (unlikely(!vgic_initialized(kvm)))
129 return vgic_irqfd_set_irq(e, kvm, irq_source_id, 1, line_status);
135 int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
137 struct kvm_irq_routing_entry *entries;
138 struct vgic_dist *dist = &kvm->arch.vgic;
139 u32 nr = dist->nr_spis;
142 entries = kcalloc(nr, sizeof(*entries), GFP_KERNEL_ACCOUNT);
146 for (i = 0; i < nr; i++) {
148 entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
149 entries[i].u.irqchip.irqchip = 0;
150 entries[i].u.irqchip.pin = i;
152 ret = kvm_set_irq_routing(kvm, entries, nr, 0);