From patchwork Sun Jul 26 14:10:01 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 37425 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 n6QEBKRK024570 for ; Sun, 26 Jul 2009 14:11:20 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753493AbZGZOK7 (ORCPT ); Sun, 26 Jul 2009 10:10:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753487AbZGZOK7 (ORCPT ); Sun, 26 Jul 2009 10:10:59 -0400 Received: from mx2.redhat.com ([66.187.237.31]:38225 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753486AbZGZOK7 (ORCPT ); Sun, 26 Jul 2009 10:10:59 -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 n6QEAxF8017057 for ; Sun, 26 Jul 2009 10:10:59 -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 n6QEAwPV029672; Sun, 26 Jul 2009 10:10:58 -0400 Received: from redhat.com (vpn-6-213.tlv.redhat.com [10.35.6.213]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n6QEAuap016203; Sun, 26 Jul 2009 10:10:56 -0400 Date: Sun, 26 Jul 2009 17:10:01 +0300 From: "Michael S. Tsirkin" To: avi@redhat.com, gleb@redhat.com, kvm@vger.kernel.org Subject: [PATCH] kvm: fix ack not being delivered when msi present Message-ID: <20090726141001.GA21167@redhat.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.19 (2009-01-05) 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 kvm_notify_acked_irq does not check irq type, so that it sometimes interprets msi vector as irq. As a result, ack notifiers are not called, which typially hangs the guest. The fix is to track and check irq type. Signed-off-by: Michael S. Tsirkin Acked-by: Gleb Natapov --- Avi, since this bug was introduced in 2.6.30 already, I think we need the fix in 2.6.30.x as well as 2.6.31. include/linux/kvm_host.h | 1 + virt/kvm/irq_comm.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f244f11..f814512 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -119,6 +119,7 @@ struct kvm_memory_slot { struct kvm_kernel_irq_routing_entry { u32 gsi; + u32 type; int (*set)(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int level); union { diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 100c267..001663f 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -171,7 +171,8 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) trace_kvm_ack_irq(irqchip, pin); list_for_each_entry(e, &kvm->irq_routing, link) - if (e->irqchip.irqchip == irqchip && + if (e->type == KVM_IRQ_ROUTING_IRQCHIP && + e->irqchip.irqchip == irqchip && e->irqchip.pin == pin) { gsi = e->gsi; break; @@ -288,6 +289,7 @@ static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, int delta; e->gsi = ue->gsi; + e->type = ue->type; switch (ue->type) { case KVM_IRQ_ROUTING_IRQCHIP: delta = 0;