From patchwork Tue Jul 14 14:30:45 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gleb Natapov X-Patchwork-Id: 35554 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n6EEVKVH013008 for ; Tue, 14 Jul 2009 14:31:21 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754902AbZGNOa6 (ORCPT ); Tue, 14 Jul 2009 10:30:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754863AbZGNOay (ORCPT ); Tue, 14 Jul 2009 10:30:54 -0400 Received: from mx2.redhat.com ([66.187.237.31]:40180 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754868AbZGNOat (ORCPT ); Tue, 14 Jul 2009 10:30:49 -0400 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id n6EEUnU1028933 for ; Tue, 14 Jul 2009 10:30:49 -0400 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n6EEUmKN020584; Tue, 14 Jul 2009 10:30:48 -0400 Received: from dhcp-1-237.tlv.redhat.com (dhcp-1-237.tlv.redhat.com [10.35.1.237]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n6EEUljr005304; Tue, 14 Jul 2009 10:30:47 -0400 Received: by dhcp-1-237.tlv.redhat.com (Postfix, from userid 13519) id 0FB421336D3; Tue, 14 Jul 2009 17:30:46 +0300 (IDT) From: Gleb Natapov To: kvm@vger.kernel.org Cc: mtosatti@redhat.com Subject: [PATCH 10/10] Change irq routing table to use gsi indexed array. Date: Tue, 14 Jul 2009 17:30:45 +0300 Message-Id: <1247581845-7625-11-git-send-email-gleb@redhat.com> In-Reply-To: <1247581845-7625-1-git-send-email-gleb@redhat.com> References: <1247581845-7625-1-git-send-email-gleb@redhat.com> X-Scanned-By: MIMEDefang 2.58 on 172.16.27.26 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Use gsi indexed array instead of scanning all entries on each interrupt injection. Also maintain back mapping from irqchip/pin to gsi to speedup interrupt acknowledgment notifications. Signed-off-by: Gleb Natapov --- include/linux/kvm_host.h | 11 ++++++- virt/kvm/irq_comm.c | 62 ++++++++++++++++++++++++++++----------------- 2 files changed, 47 insertions(+), 26 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index aa64d0d..ae6cbf1 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -128,7 +128,14 @@ struct kvm_kernel_irq_routing_entry { } irqchip; struct msi_msg msi; }; - struct list_head link; + struct hlist_node link; +}; + +struct kvm_irq_routing_table { + int chip[3][KVM_IOAPIC_NUM_PINS]; + struct kvm_kernel_irq_routing_entry *rt_entries; + u32 max_gsi; + struct hlist_head map[0]; }; struct kvm { @@ -165,7 +172,7 @@ struct kvm { #endif #ifdef CONFIG_HAVE_KVM_IRQCHIP - struct kvm_kernel_irq_routing_entry *irq_routing; + struct kvm_irq_routing_table *irq_routing; spinlock_t irq_routing_lock; struct hlist_head mask_notifier_list; struct hlist_head irq_ack_notifier_list; diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index c54a28b..da643d4 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -125,6 +125,8 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) struct kvm_kernel_irq_routing_entry *e; unsigned long *irq_state, sig_level; int ret = -1; + struct kvm_irq_routing_table *irq_rt; + struct hlist_node *n; trace_kvm_set_irq(irq, level, irq_source_id); @@ -147,14 +149,13 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) * writes to the unused one. */ rcu_read_lock(); - for (e = rcu_dereference(kvm->irq_routing); e && e->set; e++) { - if (e->gsi == irq) { - int r = e->set(e, kvm, sig_level); - if (r < 0) - continue; + irq_rt = rcu_dereference(kvm->irq_routing); + hlist_for_each_entry(e, n, &irq_rt->map[irq], link) { + int r = e->set(e, kvm, sig_level); + if (r < 0) + continue; - ret = r + ((ret < 0) ? 0 : ret); - } + ret = r + ((ret < 0) ? 0 : ret); } rcu_read_unlock(); return ret; @@ -162,21 +163,16 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) { - struct kvm_kernel_irq_routing_entry *e; struct kvm_irq_ack_notifier *kian; struct hlist_node *n; - unsigned gsi = pin; + unsigned gsi; trace_kvm_ack_irq(irqchip, pin); rcu_read_lock(); - for (e = rcu_dereference(kvm->irq_routing); e && e->set; e++) { - if (e->irqchip.irqchip == irqchip && - e->irqchip.pin == pin) { - gsi = e->gsi; - break; - } - } + gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; + if (gsi == -1) + gsi = pin; hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list, link) if (kian->gsi == gsi) @@ -277,7 +273,8 @@ void kvm_free_irq_routing(struct kvm *kvm) kfree(kvm->irq_routing); } -static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, +static int setup_routing_entry(struct kvm_irq_routing_table *rt, + struct kvm_kernel_irq_routing_entry *e, const struct kvm_irq_routing_entry *ue) { int r = -EINVAL; @@ -303,6 +300,7 @@ static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, } e->irqchip.irqchip = ue->u.irqchip.irqchip; e->irqchip.pin = ue->u.irqchip.pin + delta; + rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi; break; case KVM_IRQ_ROUTING_MSI: e->set = kvm_set_msi; @@ -313,6 +311,8 @@ static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, default: goto out; } + + hlist_add_head(&e->link, &rt->map[e->gsi]); r = 0; out: return r; @@ -324,23 +324,37 @@ int kvm_set_irq_routing(struct kvm *kvm, unsigned nr, unsigned flags) { - struct kvm_kernel_irq_routing_entry *new, *old; - unsigned i; + struct kvm_irq_routing_table *new, *old; + u32 i, j, max_gsi = 0; int r; - /* last elemet is left zeored and indicates the end of the array */ - new = kzalloc(sizeof(*new) * (nr + 1), GFP_KERNEL); + for (i = 0; i < nr; ++i) { + if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES) + return -EINVAL; + max_gsi = max(max_gsi, ue[i].gsi); + } + + max_gsi += 1; + + new = kzalloc(sizeof(*new) + (max_gsi * sizeof(struct hlist_head)) + + (nr * sizeof(struct kvm_kernel_irq_routing_entry)), + GFP_KERNEL); if (!new) return -ENOMEM; + new->rt_entries = (void *)&new->map[max_gsi]; + + new->max_gsi = max_gsi; + for (i = 0; i < 3; i++) + for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++) + new->chip[i][j] = -1; + for (i = 0; i < nr; ++i) { r = -EINVAL; - if (ue->gsi >= KVM_MAX_IRQ_ROUTES) - goto out; if (ue->flags) goto out; - r = setup_routing_entry(new + i, ue); + r = setup_routing_entry(new, &new->rt_entries[i], ue); if (r) goto out; ++ue;