From b97e6de9c96cefaa02a6a7464731ea504b45e150 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Wed, 28 Oct 2015 19:16:47 +0100 Subject: [PATCH] KVM: x86: merge kvm_arch_set_irq with kvm_set_msi_inatomic MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We do not want to do too much work in atomic context, in particular not walking all the VCPUs of the virtual machine. So we want to distinguish the architecture-specific injection function for irqfd from kvm_set_msi. Since it's still empty, reuse the newly added kvm_arch_set_irq and rename it to kvm_arch_set_irq_inatomic. Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/irq_comm.c | 14 ++++++++------ include/linux/kvm_host.h | 7 +++---- virt/kvm/eventfd.c | 11 ++++------- 3 files changed, 15 insertions(+), 17 deletions(-) diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 8f4499c7ffc1..75dc633c48dc 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -124,12 +124,16 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, } -static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm) +int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int irq_source_id, int level, + bool line_status) { struct kvm_lapic_irq irq; int r; + if (unlikely(e->type != KVM_IRQ_ROUTING_MSI)) + return -EWOULDBLOCK; + kvm_set_msi_irq(e, &irq); if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL)) @@ -165,10 +169,8 @@ int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level) idx = srcu_read_lock(&kvm->irq_srcu); if (kvm_irq_map_gsi(kvm, entries, irq) > 0) { e = &entries[0]; - if (likely(e->type == KVM_IRQ_ROUTING_MSI)) - ret = kvm_set_msi_inatomic(e, kvm); - else - ret = -EWOULDBLOCK; + ret = kvm_arch_set_irq_inatomic(e, kvm, irq_source_id, + irq, level); } srcu_read_unlock(&kvm->irq_srcu, idx); return ret; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 87189a41d904..15c78f320678 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -830,10 +830,9 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level); int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm, int irq_source_id, int level, bool line_status); - -int kvm_arch_set_irq(struct kvm_kernel_irq_routing_entry *irq, struct kvm *kvm, - int irq_source_id, int level, bool line_status); - +int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int irq_source_id, + int level, bool line_status); bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin); void kvm_notify_acked_gsi(struct kvm *kvm, int gsi); void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin); diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index e29fd2640709..46dbc0a7dfc1 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -171,7 +171,7 @@ irqfd_deactivate(struct kvm_kernel_irqfd *irqfd) queue_work(irqfd_cleanup_wq, &irqfd->shutdown); } -int __attribute__((weak)) kvm_arch_set_irq( +int __attribute__((weak)) kvm_arch_set_irq_inatomic( struct kvm_kernel_irq_routing_entry *irq, struct kvm *kvm, int irq_source_id, int level, @@ -201,12 +201,9 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key) irq = irqfd->irq_entry; } while (read_seqcount_retry(&irqfd->irq_entry_sc, seq)); /* An event has been signaled, inject an interrupt */ - if (irq.type == KVM_IRQ_ROUTING_MSI) - kvm_set_msi(&irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, - false); - else if (kvm_arch_set_irq(&irq, kvm, - KVM_USERSPACE_IRQ_SOURCE_ID, 1, - false) == -EWOULDBLOCK) + if (kvm_arch_set_irq_inatomic(&irq, kvm, + KVM_USERSPACE_IRQ_SOURCE_ID, 1, + false) == -EWOULDBLOCK) schedule_work(&irqfd->inject); srcu_read_unlock(&kvm->irq_srcu, idx); }