From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sheng Yang Subject: [PATCH 5/8] KVM: Add kvm_get_irq_routing_entry() func Date: Wed, 20 Oct 2010 16:26:29 +0800 Message-ID: <1287563192-29685-6-git-send-email-sheng@linux.intel.com> References: <1287563192-29685-1-git-send-email-sheng@linux.intel.com> Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" , Sheng Yang To: Avi Kivity , Marcelo Tosatti Return-path: Received: from mga03.intel.com ([143.182.124.21]:61694 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751676Ab0JTIZa (ORCPT ); Wed, 20 Oct 2010 04:25:30 -0400 In-Reply-To: <1287563192-29685-1-git-send-email-sheng@linux.intel.com> Sender: kvm-owner@vger.kernel.org List-ID: We need to query the entry later. Signed-off-by: Sheng Yang --- include/linux/kvm_host.h | 2 ++ virt/kvm/irq_comm.c | 20 ++++++++++++++++++++ 2 files changed, 22 insertions(+), 0 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 7f9e4b7..30f83cd 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -614,6 +614,8 @@ int kvm_set_irq_routing(struct kvm *kvm, const struct kvm_irq_routing_entry *entries, unsigned nr, unsigned flags); +struct kvm_kernel_irq_routing_entry *kvm_get_irq_routing_entry(struct kvm *kvm, + int gsi); void kvm_free_irq_routing(struct kvm *kvm); #else diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 8edca91..80ced8c 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -421,6 +421,26 @@ out: return r; } +struct kvm_kernel_irq_routing_entry *kvm_get_irq_routing_entry(struct kvm *kvm, + int gsi) +{ + int count = 0; + struct kvm_kernel_irq_routing_entry *ei = NULL; + struct kvm_irq_routing_table *irq_rt; + struct hlist_node *n; + + rcu_read_lock(); + irq_rt = rcu_dereference(kvm->irq_routing); + if (gsi < irq_rt->nr_rt_entries) + hlist_for_each_entry(ei, n, &irq_rt->map[gsi], link) + count++; + rcu_read_unlock(); + if (count == 1) + return ei; + + return NULL; +} + #define IOAPIC_ROUTING_ENTRY(irq) \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) } -- 1.7.0.1