From patchwork Thu Nov 11 07:46:57 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sheng Yang X-Patchwork-Id: 316632 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oAB7l76W032109 for ; Thu, 11 Nov 2010 07:47:09 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757799Ab0KKHrA (ORCPT ); Thu, 11 Nov 2010 02:47:00 -0500 Received: from mga11.intel.com ([192.55.52.93]:7549 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757386Ab0KKHrA (ORCPT ); Thu, 11 Nov 2010 02:47:00 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 10 Nov 2010 23:47:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,181,1288594800"; d="scan'208";a="625701253" Received: from syang10-desktop.sh.intel.com (HELO syang10-desktop) ([10.239.13.14]) by fmsmga002.fm.intel.com with ESMTP; 10 Nov 2010 23:46:59 -0800 Received: from yasker by syang10-desktop with local (Exim 4.72) (envelope-from ) id 1PGRs6-0001qQ-5y; Thu, 11 Nov 2010 15:47:02 +0800 From: Sheng Yang To: Avi Kivity , Marcelo Tosatti , "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, Sheng Yang Subject: [PATCH 4/7] KVM: Add kvm_get_irq_routing_entry() func Date: Thu, 11 Nov 2010 15:46:57 +0800 Message-Id: <1289461620-7055-5-git-send-email-sheng@linux.intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1289461620-7055-1-git-send-email-sheng@linux.intel.com> References: <1289461620-7055-1-git-send-email-sheng@linux.intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Thu, 11 Nov 2010 07:47:09 +0000 (UTC) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 7f9e4b7..e2ecbac 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); +int kvm_get_irq_routing_entry(struct kvm *kvm, int gsi, + struct kvm_kernel_irq_routing_entry *entry); 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..ae1dc7c 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -421,6 +421,26 @@ out: return r; } +int kvm_get_irq_routing_entry(struct kvm *kvm, int gsi, + struct kvm_kernel_irq_routing_entry *entry) +{ + 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++; + if (count == 1) + *entry = *ei; + rcu_read_unlock(); + + return (count != 1); +} + #define IOAPIC_ROUTING_ENTRY(irq) \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }