From patchwork Mon Jun 29 12:09:11 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: 32935 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 n5TCAYJm024471 for ; Mon, 29 Jun 2009 12:10:35 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757993AbZF2MJn (ORCPT ); Mon, 29 Jun 2009 08:09:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757884AbZF2MJn (ORCPT ); Mon, 29 Jun 2009 08:09:43 -0400 Received: from mx2.redhat.com ([66.187.237.31]:58036 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756397AbZF2MJl (ORCPT ); Mon, 29 Jun 2009 08:09:41 -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 n5TC9iGr029240; Mon, 29 Jun 2009 08:09:44 -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 n5TC9hmA009052; Mon, 29 Jun 2009 08:09:43 -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 n5TC9e07014402; Mon, 29 Jun 2009 08:09:40 -0400 Date: Mon, 29 Jun 2009 15:09:11 +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 3/4] kvm: convert bus to slots_lock Message-ID: <20090629120911.GD21273@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 Use slots_lock to protect device list on the bus. slots_lock is already taken for read everywhere, so we only need to take it for write when registering devices. This is in preparation to removing in_range and kvm->lock around it. Signed-off-by: Michael S. Tsirkin --- arch/x86/kvm/i8254.c | 4 ++-- arch/x86/kvm/i8259.c | 2 +- include/linux/kvm_host.h | 3 ++- virt/kvm/ioapic.c | 2 +- virt/kvm/kvm_main.c | 5 ++++- 5 files changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 331705f..c2387ec 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -620,11 +620,11 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags) kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier); kvm_iodevice_init(&pit->dev, &pit_dev_ops); - kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev); + kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &pit->dev); if (flags & KVM_PIT_SPEAKER_DUMMY) { kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops); - kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev); + kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &pit->speaker_dev); } return pit; diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 148c52a..1851aec 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -548,6 +548,6 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm) * Initialize PIO device */ kvm_iodevice_init(&s->dev, &picdev_ops); - kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev); + kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &s->dev); return s; } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2451f48..8b1ee3f 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -42,6 +42,7 @@ #define KVM_USERSPACE_IRQ_SOURCE_ID 0 +struct kvm; struct kvm_vcpu; extern struct kmem_cache *kvm_vcpu_cache; @@ -61,7 +62,7 @@ void kvm_io_bus_init(struct kvm_io_bus *bus); void kvm_io_bus_destroy(struct kvm_io_bus *bus); struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr, int len, int is_write); -void kvm_io_bus_register_dev(struct kvm_io_bus *bus, +void kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus, struct kvm_io_device *dev); struct kvm_vcpu { diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index d8b2eca..ad80ead 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -343,7 +343,7 @@ int kvm_ioapic_init(struct kvm *kvm) kvm_ioapic_reset(ioapic); kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); ioapic->kvm = kvm; - kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev); + kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &ioapic->dev); return 0; } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 58d6bc6..7bb2821 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2499,11 +2499,14 @@ struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, return NULL; } -void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) +void kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus, + struct kvm_io_device *dev) { + down_write(&kvm->slots_lock); BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); bus->devs[bus->dev_count++] = dev; + up_write(&kvm->slots_lock); } static struct notifier_block kvm_cpu_notifier = {