From patchwork Tue Jul 24 22:33:59 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nicholas A. Bellinger" X-Patchwork-Id: 1233531 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 499963FD4F for ; Tue, 24 Jul 2012 22:37:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755422Ab2GXWhR (ORCPT ); Tue, 24 Jul 2012 18:37:17 -0400 Received: from mail.linux-iscsi.org ([67.23.28.174]:40989 "EHLO linux-iscsi.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755229Ab2GXWhQ (ORCPT ); Tue, 24 Jul 2012 18:37:16 -0400 Received: from linux-iscsi.org (localhost [127.0.0.1]) by linux-iscsi.org (Postfix) with ESMTP id 73D3F22D9DE; Tue, 24 Jul 2012 22:34:14 +0000 (UTC) From: "Nicholas A. Bellinger" To: target-devel Cc: lf-virt , kvm-devel , qemu-devel , Stefan Hajnoczi , Zhi Yong Wu , Anthony Liguori , Paolo Bonzini , "Michael S. Tsirkin" , Christoph Hellwig , Jens Axboe , Hannes Reinecke , Anthony Liguori Subject: [RFC 2/9] virtio-pci: support host notifiers in TCG mode Date: Tue, 24 Jul 2012 22:33:59 +0000 Message-Id: <1343169246-17636-3-git-send-email-nab@linux-iscsi.org> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1343169246-17636-1-git-send-email-nab@linux-iscsi.org> References: <1343169246-17636-1-git-send-email-nab@linux-iscsi.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Stefan Hajnoczi Normally host notifiers are only used together with vhost-net in KVM mode. It is occassionally useful to use vhost with TCG mode, mainly for testing and development. This isn't hard to achieve, simply fall back to notifying the host notifier manually from qemu if KVM mode is disabled. Signed-off-by: Stefan Hajnoczi Cc: Anthony Liguori Cc: Paolo Bonzini Signed-off-by: Nicholas Bellinger --- hw/virtio-pci.c | 23 ++++++++++++++++++++--- hw/virtio.c | 7 +++++++ 2 files changed, 27 insertions(+), 3 deletions(-) diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index 4e03f0b..538eef4 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -249,6 +249,25 @@ void virtio_pci_reset(DeviceState *d) proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG; } +static void virtio_pci_queue_notify(VirtIOPCIProxy *proxy, uint32_t n) +{ + VirtQueue *vq; + EventNotifier *notifier; + + if (n >= VIRTIO_PCI_QUEUE_MAX) { + return; + } + + vq = virtio_get_queue(proxy->vdev, n); + notifier = virtio_queue_get_host_notifier(vq); + if (event_notifier_valid(notifier)) { + printf("notifying vq %u host notifier from userspace\n", n); + event_notifier_notify(notifier); + } else { + virtio_queue_notify_vq(vq); + } +} + static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) { VirtIOPCIProxy *proxy = opaque; @@ -278,9 +297,7 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) vdev->queue_sel = val; break; case VIRTIO_PCI_QUEUE_NOTIFY: - if (val < VIRTIO_PCI_QUEUE_MAX) { - virtio_queue_notify(vdev, val); - } + virtio_pci_queue_notify(proxy, val); break; case VIRTIO_PCI_STATUS: if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { diff --git a/hw/virtio.c b/hw/virtio.c index d146f86..36a18b5 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -536,6 +536,11 @@ void virtio_reset(void *opaque) vdev->vq[i].signalled_used = 0; vdev->vq[i].signalled_used_valid = false; vdev->vq[i].notification = true; + + assert(!event_notifier_valid(&vdev->vq[i].guest_notifier)); + assert(!event_notifier_valid(&vdev->vq[i].host_notifier)); + vdev->vq[i].guest_notifier = EVENT_NOTIFIER_INITIALIZER; + vdev->vq[i].host_notifier = EVENT_NOTIFIER_INITIALIZER; } } @@ -905,6 +910,8 @@ VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { vdev->vq[i].vector = VIRTIO_NO_VECTOR; vdev->vq[i].vdev = vdev; + vdev->vq[i].guest_notifier = EVENT_NOTIFIER_INITIALIZER; + vdev->vq[i].host_notifier = EVENT_NOTIFIER_INITIALIZER; } vdev->name = name;