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427 lines
11 KiB
427 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* irq_comm.c: Common API for in kernel interrupt controller |
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* Copyright (c) 2007, Intel Corporation. |
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* |
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* Authors: |
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* Yaozu (Eddie) Dong <[email protected]> |
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* |
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* Copyright 2010 Red Hat, Inc. and/or its affiliates. |
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*/ |
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#include <linux/kvm_host.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <linux/rculist.h> |
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#include <trace/events/kvm.h> |
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#include "irq.h" |
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#include "ioapic.h" |
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#include "lapic.h" |
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#include "hyperv.h" |
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#include "x86.h" |
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static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, |
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struct kvm *kvm, int irq_source_id, int level, |
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bool line_status) |
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{ |
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struct kvm_pic *pic = kvm->arch.vpic; |
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return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level); |
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} |
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static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, |
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struct kvm *kvm, int irq_source_id, int level, |
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bool line_status) |
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{ |
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struct kvm_ioapic *ioapic = kvm->arch.vioapic; |
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return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level, |
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line_status); |
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} |
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int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, |
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struct kvm_lapic_irq *irq, struct dest_map *dest_map) |
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{ |
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int i, r = -1; |
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struct kvm_vcpu *vcpu, *lowest = NULL; |
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unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]; |
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unsigned int dest_vcpus = 0; |
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if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map)) |
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return r; |
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if (irq->dest_mode == APIC_DEST_PHYSICAL && |
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irq->dest_id == 0xff && kvm_lowest_prio_delivery(irq)) { |
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printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); |
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irq->delivery_mode = APIC_DM_FIXED; |
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} |
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memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap)); |
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kvm_for_each_vcpu(i, vcpu, kvm) { |
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if (!kvm_apic_present(vcpu)) |
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continue; |
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if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, |
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irq->dest_id, irq->dest_mode)) |
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continue; |
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if (!kvm_lowest_prio_delivery(irq)) { |
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if (r < 0) |
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r = 0; |
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r += kvm_apic_set_irq(vcpu, irq, dest_map); |
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} else if (kvm_apic_sw_enabled(vcpu->arch.apic)) { |
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if (!kvm_vector_hashing_enabled()) { |
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if (!lowest) |
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lowest = vcpu; |
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else if (kvm_apic_compare_prio(vcpu, lowest) < 0) |
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lowest = vcpu; |
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} else { |
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__set_bit(i, dest_vcpu_bitmap); |
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dest_vcpus++; |
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} |
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} |
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} |
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if (dest_vcpus != 0) { |
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int idx = kvm_vector_to_index(irq->vector, dest_vcpus, |
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dest_vcpu_bitmap, KVM_MAX_VCPUS); |
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lowest = kvm_get_vcpu(kvm, idx); |
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} |
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if (lowest) |
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r = kvm_apic_set_irq(lowest, irq, dest_map); |
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return r; |
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} |
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void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, |
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struct kvm_lapic_irq *irq) |
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{ |
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struct msi_msg msg = { .address_lo = e->msi.address_lo, |
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.address_hi = e->msi.address_hi, |
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.data = e->msi.data }; |
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trace_kvm_msi_set_irq(msg.address_lo | (kvm->arch.x2apic_format ? |
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(u64)msg.address_hi << 32 : 0), msg.data); |
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irq->dest_id = x86_msi_msg_get_destid(&msg, kvm->arch.x2apic_format); |
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irq->vector = msg.arch_data.vector; |
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irq->dest_mode = kvm_lapic_irq_dest_mode(msg.arch_addr_lo.dest_mode_logical); |
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irq->trig_mode = msg.arch_data.is_level; |
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irq->delivery_mode = msg.arch_data.delivery_mode << 8; |
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irq->msi_redir_hint = msg.arch_addr_lo.redirect_hint; |
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irq->level = 1; |
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irq->shorthand = APIC_DEST_NOSHORT; |
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} |
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EXPORT_SYMBOL_GPL(kvm_set_msi_irq); |
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static inline bool kvm_msi_route_invalid(struct kvm *kvm, |
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struct kvm_kernel_irq_routing_entry *e) |
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{ |
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return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff); |
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} |
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int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, |
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struct kvm *kvm, int irq_source_id, int level, bool line_status) |
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{ |
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struct kvm_lapic_irq irq; |
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if (kvm_msi_route_invalid(kvm, e)) |
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return -EINVAL; |
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if (!level) |
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return -1; |
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kvm_set_msi_irq(kvm, e, &irq); |
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return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL); |
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} |
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static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e, |
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struct kvm *kvm, int irq_source_id, int level, |
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bool line_status) |
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{ |
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if (!level) |
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return -1; |
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return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint); |
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} |
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int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, |
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struct kvm *kvm, int irq_source_id, int level, |
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bool line_status) |
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{ |
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struct kvm_lapic_irq irq; |
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int r; |
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switch (e->type) { |
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case KVM_IRQ_ROUTING_HV_SINT: |
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return kvm_hv_set_sint(e, kvm, irq_source_id, level, |
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line_status); |
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case KVM_IRQ_ROUTING_MSI: |
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if (kvm_msi_route_invalid(kvm, e)) |
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return -EINVAL; |
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kvm_set_msi_irq(kvm, e, &irq); |
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if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL)) |
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return r; |
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break; |
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default: |
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break; |
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} |
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return -EWOULDBLOCK; |
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} |
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int kvm_request_irq_source_id(struct kvm *kvm) |
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{ |
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unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; |
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int irq_source_id; |
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mutex_lock(&kvm->irq_lock); |
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irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG); |
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if (irq_source_id >= BITS_PER_LONG) { |
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printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); |
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irq_source_id = -EFAULT; |
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goto unlock; |
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} |
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ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); |
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ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); |
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set_bit(irq_source_id, bitmap); |
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unlock: |
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mutex_unlock(&kvm->irq_lock); |
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return irq_source_id; |
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} |
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void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) |
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{ |
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ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); |
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ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); |
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mutex_lock(&kvm->irq_lock); |
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if (irq_source_id < 0 || |
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irq_source_id >= BITS_PER_LONG) { |
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printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); |
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goto unlock; |
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} |
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clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); |
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if (!irqchip_kernel(kvm)) |
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goto unlock; |
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kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id); |
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kvm_pic_clear_all(kvm->arch.vpic, irq_source_id); |
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unlock: |
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mutex_unlock(&kvm->irq_lock); |
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} |
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void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, |
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struct kvm_irq_mask_notifier *kimn) |
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{ |
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mutex_lock(&kvm->irq_lock); |
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kimn->irq = irq; |
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hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list); |
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mutex_unlock(&kvm->irq_lock); |
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} |
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void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, |
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struct kvm_irq_mask_notifier *kimn) |
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{ |
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mutex_lock(&kvm->irq_lock); |
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hlist_del_rcu(&kimn->link); |
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mutex_unlock(&kvm->irq_lock); |
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synchronize_srcu(&kvm->irq_srcu); |
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} |
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void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin, |
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bool mask) |
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{ |
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struct kvm_irq_mask_notifier *kimn; |
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int idx, gsi; |
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idx = srcu_read_lock(&kvm->irq_srcu); |
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gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin); |
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if (gsi != -1) |
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hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link) |
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if (kimn->irq == gsi) |
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kimn->func(kimn, mask); |
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srcu_read_unlock(&kvm->irq_srcu, idx); |
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} |
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bool kvm_arch_can_set_irq_routing(struct kvm *kvm) |
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{ |
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return irqchip_in_kernel(kvm); |
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} |
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int kvm_set_routing_entry(struct kvm *kvm, |
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struct kvm_kernel_irq_routing_entry *e, |
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const struct kvm_irq_routing_entry *ue) |
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{ |
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/* We can't check irqchip_in_kernel() here as some callers are |
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* currently inititalizing the irqchip. Other callers should therefore |
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* check kvm_arch_can_set_irq_routing() before calling this function. |
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*/ |
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switch (ue->type) { |
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case KVM_IRQ_ROUTING_IRQCHIP: |
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if (irqchip_split(kvm)) |
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return -EINVAL; |
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e->irqchip.pin = ue->u.irqchip.pin; |
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switch (ue->u.irqchip.irqchip) { |
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case KVM_IRQCHIP_PIC_SLAVE: |
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e->irqchip.pin += PIC_NUM_PINS / 2; |
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fallthrough; |
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case KVM_IRQCHIP_PIC_MASTER: |
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if (ue->u.irqchip.pin >= PIC_NUM_PINS / 2) |
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return -EINVAL; |
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e->set = kvm_set_pic_irq; |
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break; |
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case KVM_IRQCHIP_IOAPIC: |
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if (ue->u.irqchip.pin >= KVM_IOAPIC_NUM_PINS) |
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return -EINVAL; |
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e->set = kvm_set_ioapic_irq; |
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break; |
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default: |
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return -EINVAL; |
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} |
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e->irqchip.irqchip = ue->u.irqchip.irqchip; |
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break; |
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case KVM_IRQ_ROUTING_MSI: |
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e->set = kvm_set_msi; |
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e->msi.address_lo = ue->u.msi.address_lo; |
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e->msi.address_hi = ue->u.msi.address_hi; |
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e->msi.data = ue->u.msi.data; |
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if (kvm_msi_route_invalid(kvm, e)) |
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return -EINVAL; |
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break; |
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case KVM_IRQ_ROUTING_HV_SINT: |
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e->set = kvm_hv_set_sint; |
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e->hv_sint.vcpu = ue->u.hv_sint.vcpu; |
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e->hv_sint.sint = ue->u.hv_sint.sint; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, |
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struct kvm_vcpu **dest_vcpu) |
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{ |
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int i, r = 0; |
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struct kvm_vcpu *vcpu; |
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if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu)) |
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return true; |
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kvm_for_each_vcpu(i, vcpu, kvm) { |
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if (!kvm_apic_present(vcpu)) |
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continue; |
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if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand, |
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irq->dest_id, irq->dest_mode)) |
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continue; |
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if (++r == 2) |
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return false; |
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*dest_vcpu = vcpu; |
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} |
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return r == 1; |
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} |
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EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu); |
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#define IOAPIC_ROUTING_ENTRY(irq) \ |
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{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ |
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.u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } } |
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#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) |
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#define PIC_ROUTING_ENTRY(irq) \ |
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{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ |
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.u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } } |
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#define ROUTING_ENTRY2(irq) \ |
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IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) |
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static const struct kvm_irq_routing_entry default_routing[] = { |
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ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), |
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ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), |
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ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), |
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ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), |
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ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), |
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ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), |
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ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), |
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ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), |
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ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), |
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ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), |
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ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), |
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ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), |
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}; |
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int kvm_setup_default_irq_routing(struct kvm *kvm) |
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{ |
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return kvm_set_irq_routing(kvm, default_routing, |
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ARRAY_SIZE(default_routing), 0); |
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} |
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static const struct kvm_irq_routing_entry empty_routing[] = {}; |
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int kvm_setup_empty_irq_routing(struct kvm *kvm) |
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{ |
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return kvm_set_irq_routing(kvm, empty_routing, 0, 0); |
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} |
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void kvm_arch_post_irq_routing_update(struct kvm *kvm) |
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{ |
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if (!irqchip_split(kvm)) |
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return; |
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kvm_make_scan_ioapic_request(kvm); |
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} |
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void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, |
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ulong *ioapic_handled_vectors) |
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{ |
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struct kvm *kvm = vcpu->kvm; |
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struct kvm_kernel_irq_routing_entry *entry; |
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struct kvm_irq_routing_table *table; |
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u32 i, nr_ioapic_pins; |
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int idx; |
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idx = srcu_read_lock(&kvm->irq_srcu); |
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table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); |
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nr_ioapic_pins = min_t(u32, table->nr_rt_entries, |
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kvm->arch.nr_reserved_ioapic_pins); |
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for (i = 0; i < nr_ioapic_pins; ++i) { |
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hlist_for_each_entry(entry, &table->map[i], link) { |
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struct kvm_lapic_irq irq; |
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if (entry->type != KVM_IRQ_ROUTING_MSI) |
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continue; |
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kvm_set_msi_irq(vcpu->kvm, entry, &irq); |
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if (irq.trig_mode && |
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kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT, |
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irq.dest_id, irq.dest_mode)) |
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__set_bit(irq.vector, ioapic_handled_vectors); |
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} |
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} |
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srcu_read_unlock(&kvm->irq_srcu, idx); |
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} |
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void kvm_arch_irq_routing_update(struct kvm *kvm) |
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{ |
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kvm_hv_irq_routing_update(kvm); |
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}
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