diff options
Diffstat (limited to 'virt/kvm/irqchip.c')
-rw-r--r-- | virt/kvm/irqchip.c | 98 |
1 files changed, 37 insertions, 61 deletions
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c index b43c275775cd..7f256f31df10 100644 --- a/virt/kvm/irqchip.c +++ b/virt/kvm/irqchip.c @@ -31,65 +31,42 @@ #include <trace/events/kvm.h> #include "irq.h" -bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin) -{ - struct kvm_irq_ack_notifier *kian; - int gsi, idx; - - idx = srcu_read_lock(&kvm->irq_srcu); - gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin]; - if (gsi != -1) - hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list, - link) - if (kian->gsi == gsi) { - srcu_read_unlock(&kvm->irq_srcu, idx); - return true; - } - - srcu_read_unlock(&kvm->irq_srcu, idx); - - return false; -} -EXPORT_SYMBOL_GPL(kvm_irq_has_notifier); +struct kvm_irq_routing_table { + int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS]; + struct kvm_kernel_irq_routing_entry *rt_entries; + u32 nr_rt_entries; + /* + * Array indexed by gsi. Each entry contains list of irq chips + * the gsi is connected to. + */ + struct hlist_head map[0]; +}; -void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) +int kvm_irq_map_gsi(struct kvm *kvm, + struct kvm_kernel_irq_routing_entry *entries, int gsi) { - struct kvm_irq_ack_notifier *kian; - int gsi, idx; - - trace_kvm_ack_irq(irqchip, pin); + struct kvm_irq_routing_table *irq_rt; + struct kvm_kernel_irq_routing_entry *e; + int n = 0; + + irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, + lockdep_is_held(&kvm->irq_lock)); + if (gsi < irq_rt->nr_rt_entries) { + hlist_for_each_entry(e, &irq_rt->map[gsi], link) { + entries[n] = *e; + ++n; + } + } - idx = srcu_read_lock(&kvm->irq_srcu); - gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin]; - if (gsi != -1) - hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list, - link) - if (kian->gsi == gsi) - kian->irq_acked(kian); - srcu_read_unlock(&kvm->irq_srcu, idx); + return n; } -void kvm_register_irq_ack_notifier(struct kvm *kvm, - struct kvm_irq_ack_notifier *kian) +int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) { - mutex_lock(&kvm->irq_lock); - hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list); - mutex_unlock(&kvm->irq_lock); -#ifdef __KVM_HAVE_IOAPIC - kvm_vcpu_request_scan_ioapic(kvm); -#endif -} + struct kvm_irq_routing_table *irq_rt; -void kvm_unregister_irq_ack_notifier(struct kvm *kvm, - struct kvm_irq_ack_notifier *kian) -{ - mutex_lock(&kvm->irq_lock); - hlist_del_init_rcu(&kian->link); - mutex_unlock(&kvm->irq_lock); - synchronize_srcu(&kvm->irq_srcu); -#ifdef __KVM_HAVE_IOAPIC - kvm_vcpu_request_scan_ioapic(kvm); -#endif + irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); + return irq_rt->chip[irqchip][pin]; } int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) @@ -115,9 +92,8 @@ int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, bool line_status) { - struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS]; - int ret = -1, i = 0, idx; - struct kvm_irq_routing_table *irq_rt; + struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS]; + int ret = -1, i, idx; trace_kvm_set_irq(irq, level, irq_source_id); @@ -126,10 +102,7 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, * writes to the unused one. */ idx = srcu_read_lock(&kvm->irq_srcu); - irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); - if (irq < irq_rt->nr_rt_entries) - hlist_for_each_entry(e, &irq_rt->map[irq], link) - irq_set[i++] = *e; + i = kvm_irq_map_gsi(kvm, irq_set, irq); srcu_read_unlock(&kvm->irq_srcu, idx); while(i--) { @@ -171,9 +144,11 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt, e->gsi = ue->gsi; e->type = ue->type; - r = kvm_set_routing_entry(rt, e, ue); + r = kvm_set_routing_entry(e, ue); if (r) goto out; + if (e->type == KVM_IRQ_ROUTING_IRQCHIP) + rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi; hlist_add_head(&e->link, &rt->map[e->gsi]); r = 0; @@ -224,7 +199,8 @@ int kvm_set_irq_routing(struct kvm *kvm, mutex_lock(&kvm->irq_lock); old = kvm->irq_routing; - kvm_irq_routing_update(kvm, new); + rcu_assign_pointer(kvm->irq_routing, new); + kvm_irq_routing_update(kvm); mutex_unlock(&kvm->irq_lock); synchronize_srcu_expedited(&kvm->irq_srcu); |