From patchwork Mon Jun 29 12:09:03 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: 32934 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 n5TCAYJl024471 for ; Mon, 29 Jun 2009 12:10:35 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757363AbZF2MJe (ORCPT ); Mon, 29 Jun 2009 08:09:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757666AbZF2MJe (ORCPT ); Mon, 29 Jun 2009 08:09:34 -0400 Received: from mx2.redhat.com ([66.187.237.31]:58029 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753057AbZF2MJd (ORCPT ); Mon, 29 Jun 2009 08:09:33 -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 n5TC9Z44029205; Mon, 29 Jun 2009 08:09:35 -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 n5TC9YxX009006; Mon, 29 Jun 2009 08:09:34 -0400 Received: from redhat.com (vpn-6-102.tlv.redhat.com [10.35.6.102]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n5TC9Vcw014381; Mon, 29 Jun 2009 08:09:32 -0400 Date: Mon, 29 Jun 2009 15:09:03 +0300 From: "Michael S. Tsirkin" To: Gregory Haskins , avi@redhat.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, avi@redhat.com, mtosatti@redhat.com, paulmck@linux.vnet.ibm.com, markmc@redhat.com Subject: [PATCHv3 2/4] kvm: switch coalesced mmio changes to slots_lock Message-ID: <20090629120903.GC21273@redhat.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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 switch coalesced mmio slots_lock. slots_lock is already taken for read everywhere, so we only need to take it for write when changing zones. This is in preparation to removing in_range and kvm->lock around it. Signed-off-by: Michael S. Tsirkin --- virt/kvm/coalesced_mmio.c | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index 397f419..7b7cc9f 100644 --- a/virt/kvm/coalesced_mmio.c +++ b/virt/kvm/coalesced_mmio.c @@ -102,7 +102,7 @@ int kvm_coalesced_mmio_init(struct kvm *kvm) kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops); dev->kvm = kvm; kvm->coalesced_mmio_dev = dev; - kvm_io_bus_register_dev(&kvm->mmio_bus, &dev->dev); + kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev); return 0; } @@ -115,16 +115,16 @@ int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm, if (dev == NULL) return -EINVAL; - mutex_lock(&kvm->lock); + down_write(&kvm->slots_lock); if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) { - mutex_unlock(&kvm->lock); + up_write(&kvm->slots_lock); return -ENOBUFS; } dev->zone[dev->nb_zones] = *zone; dev->nb_zones++; - mutex_unlock(&kvm->lock); + up_write(&kvm->slots_lock); return 0; } @@ -138,7 +138,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm, if (dev == NULL) return -EINVAL; - mutex_lock(&kvm->lock); + down_write(&kvm->slots_lock); i = dev->nb_zones; while(i) { @@ -156,7 +156,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm, i--; } - mutex_unlock(&kvm->lock); + up_write(&kvm->slots_lock); return 0; }