From c905880e253b8e2f77db26dcb647a1a3bb359b11 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 30 Jun 2014 20:51:12 +1000 Subject: [PATCH] KVM: Move irq notifier implementation into eventfd.c This moves the functions kvm_irq_has_notifier(), kvm_notify_acked_irq(), kvm_register_irq_ack_notifier() and kvm_unregister_irq_ack_notifier() from irqchip.c to eventfd.c. The reason for doing this is that those functions are used in connection with IRQFDs, which are implemented in eventfd.c. In future we will want to use IRQFDs on platforms that don't implement the GSI routing implemented in irqchip.c, so we won't be compiling in irqchip.c, but we still need the irq notifiers. The implementation is unchanged. Signed-off-by: Paul Mackerras Tested-by: Eric Auger Tested-by: Cornelia Huck Signed-off-by: Paolo Bonzini (cherry picked from commit e4d57e1ee1ab59f0cef0272800ac6c52e0ec814a) Signed-off-by: Christoffer Dall --- virt/kvm/eventfd.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++ virt/kvm/irqchip.c | 61 -------------------------------------------- 2 files changed, 63 insertions(+), 61 deletions(-) diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 71133644f465..d2b1653c97dd 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -34,7 +34,9 @@ #include #include #include +#include +#include "irq.h" #include "iodev.h" #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING @@ -830,3 +832,64 @@ kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) return kvm_assign_ioeventfd(kvm, args); } + +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 = kvm_irq_map_chip_pin(kvm, 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); + +void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) +{ + struct kvm_irq_ack_notifier *kian; + int gsi, idx; + + trace_kvm_ack_irq(irqchip, pin); + + idx = srcu_read_lock(&kvm->irq_srcu); + gsi = kvm_irq_map_chip_pin(kvm, 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); +} + +void kvm_register_irq_ack_notifier(struct kvm *kvm, + struct kvm_irq_ack_notifier *kian) +{ + 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 +} + +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 +} diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c index 04faac50cef5..7f256f31df10 100644 --- a/virt/kvm/irqchip.c +++ b/virt/kvm/irqchip.c @@ -69,67 +69,6 @@ int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) return irq_rt->chip[irqchip][pin]; } -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 = kvm_irq_map_chip_pin(kvm, 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); - -void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) -{ - struct kvm_irq_ack_notifier *kian; - int gsi, idx; - - trace_kvm_ack_irq(irqchip, pin); - - idx = srcu_read_lock(&kvm->irq_srcu); - gsi = kvm_irq_map_chip_pin(kvm, 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); -} - -void kvm_register_irq_ack_notifier(struct kvm *kvm, - struct kvm_irq_ack_notifier *kian) -{ - 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 -} - -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 -} - int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) { struct kvm_kernel_irq_routing_entry route; -- 2.34.1