From patchwork Wed Jul 20 13:11:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 12923960 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D5296C433EF for ; Wed, 20 Jul 2022 13:22:59 +0000 (UTC) Received: from localhost ([::1]:51370 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oE9fG-0003n4-VR for qemu-devel@archiver.kernel.org; Wed, 20 Jul 2022 09:22:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60876) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oE9V3-0005Qy-Js for qemu-devel@nongnu.org; Wed, 20 Jul 2022 09:12:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:30657) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oE9V1-0006qZ-Fv for qemu-devel@nongnu.org; Wed, 20 Jul 2022 09:12:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658322742; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=T4YJxl2Ihvh9ReBnIK1lQc/64ru3Eo2avWjYkmJ9JfE=; b=ThiEl8WJmrnC1lCHB2FVk/+eEGbz+Lcejq5KPi7phaAE7r+Y/zY3h/6kpE1XTuwlDbU90S pjZ19/JR9ybozLTuAR8XtnPRvONfetMj/pDcIlHn3NmsIqsI6VgE6Of4JwZ91TXzZJ4QVh sJ17LqkpTsAc7baEqdzPh9VK4/Wt0oU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-62-8LlK1HfvP5eqI4Gc4V-Pag-1; Wed, 20 Jul 2022 09:12:21 -0400 X-MC-Unique: 8LlK1HfvP5eqI4Gc4V-Pag-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3CA5D1C16B47; Wed, 20 Jul 2022 13:12:21 +0000 (UTC) Received: from server.redhat.com (ovpn-13-124.pek2.redhat.com [10.72.13.124]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0CDFBC2C7EC; Wed, 20 Jul 2022 13:12:16 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, qemu-devel@nongnu.org Cc: Jason Wang , virtio-fs@redhat.com, Stefan Hajnoczi , "Dr. David Alan Gilbert" , "Michael S. Tsirkin" , "Gonglei (Arei)" , Gerd Hoffmann , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= Subject: [PATCH v13 02/10] virtio-pci: decouple notifier from interrupt process Date: Wed, 20 Jul 2022 21:11:56 +0800 Message-Id: <20220720131204.591104-3-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 Received-SPF: pass client-ip=170.10.133.124; envelope-from=lulu@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" To reuse the notifier process. We add the virtio_pci_get_notifier to get the notifier and vector. The INPUT for this function is IDX, The OUTPUT is the notifier and the vector Signed-off-by: Cindy Lu --- hw/virtio/virtio-pci.c | 88 +++++++++++++++++++++++++++--------------- 1 file changed, 57 insertions(+), 31 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 7cf1231c1c..2869d0d2f6 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -705,29 +705,41 @@ static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy, } static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy, - unsigned int queue_no, + EventNotifier *n, unsigned int vector) { VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - VirtQueue *vq = virtio_get_queue(vdev, queue_no); - EventNotifier *n = virtio_queue_get_guest_notifier(vq); return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq); } static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy, - unsigned int queue_no, + EventNotifier *n , unsigned int vector) { - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - VirtQueue *vq = virtio_get_queue(vdev, queue_no); - EventNotifier *n = virtio_queue_get_guest_notifier(vq); VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; int ret; ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq); assert(ret == 0); } +static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no, + EventNotifier **n, unsigned int *vector) +{ + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); + VirtQueue *vq; + + if (queue_no == VIRTIO_CONFIG_IRQ_IDX) { + return -1; + } else { + if (!virtio_queue_get_num(vdev, queue_no)) { + return -1; + } + *vector = virtio_queue_vector(vdev, queue_no); + vq = virtio_get_queue(vdev, queue_no); + *n = virtio_queue_get_guest_notifier(vq); + } + return 0; +} static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) { @@ -736,12 +748,15 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); unsigned int vector; int ret, queue_no; - + EventNotifier *n; for (queue_no = 0; queue_no < nvqs; queue_no++) { if (!virtio_queue_get_num(vdev, queue_no)) { break; } - vector = virtio_queue_vector(vdev, queue_no); + ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + break; + } if (vector >= msix_nr_vectors_allocated(dev)) { continue; } @@ -753,7 +768,7 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) * Otherwise, delay until unmasked in the frontend. */ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector); + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); if (ret < 0) { kvm_virtio_pci_vq_vector_release(proxy, vector); goto undo; @@ -769,7 +784,11 @@ undo: continue; } if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); + ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + break; + } + kvm_virtio_pci_irqfd_release(proxy, n, vector); } kvm_virtio_pci_vq_vector_release(proxy, vector); } @@ -783,12 +802,16 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) unsigned int vector; int queue_no; VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); - + EventNotifier *n; + int ret ; for (queue_no = 0; queue_no < nvqs; queue_no++) { if (!virtio_queue_get_num(vdev, queue_no)) { break; } - vector = virtio_queue_vector(vdev, queue_no); + ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + break; + } if (vector >= msix_nr_vectors_allocated(dev)) { continue; } @@ -796,21 +819,20 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) * Otherwise, it was cleaned when masked in the frontend. */ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); + kvm_virtio_pci_irqfd_release(proxy, n, vector); } kvm_virtio_pci_vq_vector_release(proxy, vector); } } -static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy, +static int virtio_pci_one_vector_unmask(VirtIOPCIProxy *proxy, unsigned int queue_no, unsigned int vector, - MSIMessage msg) + MSIMessage msg, + EventNotifier *n) { VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); - VirtQueue *vq = virtio_get_queue(vdev, queue_no); - EventNotifier *n = virtio_queue_get_guest_notifier(vq); VirtIOIRQFD *irqfd; int ret = 0; @@ -837,14 +859,15 @@ static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy, event_notifier_set(n); } } else { - ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector); + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); } return ret; } -static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy, +static void virtio_pci_one_vector_mask(VirtIOPCIProxy *proxy, unsigned int queue_no, - unsigned int vector) + unsigned int vector, + EventNotifier *n) { VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); @@ -855,7 +878,7 @@ static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy, if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { k->guest_notifier_mask(vdev, queue_no, true); } else { - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); + kvm_virtio_pci_irqfd_release(proxy, n, vector); } } @@ -865,6 +888,7 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); VirtQueue *vq = virtio_vector_first_queue(vdev, vector); + EventNotifier *n; int ret, index, unmasked = 0; while (vq) { @@ -873,7 +897,8 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, break; } if (index < proxy->nvqs_with_notifiers) { - ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg); + n = virtio_queue_get_guest_notifier(vq); + ret = virtio_pci_one_vector_unmask(proxy, index, vector, msg, n); if (ret < 0) { goto undo; } @@ -889,7 +914,8 @@ undo: while (vq && unmasked >= 0) { index = virtio_get_queue_index(vq); if (index < proxy->nvqs_with_notifiers) { - virtio_pci_vq_vector_mask(proxy, index, vector); + n = virtio_queue_get_guest_notifier(vq); + virtio_pci_one_vector_mask(proxy, index, vector, n); --unmasked; } vq = virtio_vector_next_queue(vq); @@ -902,15 +928,17 @@ static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector) VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); VirtQueue *vq = virtio_vector_first_queue(vdev, vector); + EventNotifier *n; int index; while (vq) { index = virtio_get_queue_index(vq); + n = virtio_queue_get_guest_notifier(vq); if (!virtio_queue_get_num(vdev, index)) { break; } if (index < proxy->nvqs_with_notifiers) { - virtio_pci_vq_vector_mask(proxy, index, vector); + virtio_pci_one_vector_mask(proxy, index, vector, n); } vq = virtio_vector_next_queue(vq); } @@ -926,19 +954,17 @@ static void virtio_pci_vector_poll(PCIDevice *dev, int queue_no; unsigned int vector; EventNotifier *notifier; - VirtQueue *vq; + int ret; for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { - if (!virtio_queue_get_num(vdev, queue_no)) { + ret = virtio_pci_get_notifier(proxy, queue_no, ¬ifier, &vector); + if (ret < 0) { break; } - vector = virtio_queue_vector(vdev, queue_no); if (vector < vector_start || vector >= vector_end || !msix_is_masked(dev, vector)) { continue; } - vq = virtio_get_queue(vdev, queue_no); - notifier = virtio_queue_get_guest_notifier(vq); if (k->guest_notifier_pending) { if (k->guest_notifier_pending(vdev, queue_no)) { msix_set_pending(dev, vector);