From patchwork Wed Aug 3 17:18:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 12935779 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF7CDC19F2C for ; Wed, 3 Aug 2022 17:19:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236873AbiHCRTb (ORCPT ); Wed, 3 Aug 2022 13:19:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57488 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237931AbiHCRTZ (ORCPT ); Wed, 3 Aug 2022 13:19:25 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3B7945467C for ; Wed, 3 Aug 2022 10:19:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1659547160; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=FS8WOWx2Mlz/EPB9nn2iUK0MkKtiWEii0lW9lgeSWZc=; b=Pfzv83jF5BUtKMV+VWTaidkRrwRqCq9QVsD2XTWKx654sbqIkIxNVE+mQagmikUV0CG94U j+SQv67ZAgKd1VpGIp2h2Z8x8+crJrM1DXW7ICZdOFSL5owC2/SV4jFgFCYvVj0y3FfTcV GdCZooxORr5UYO3eH9A5ZQ+q0QayxA8= 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-184-_Mgt6Ij6ORGrFasUXz0O6w-1; Wed, 03 Aug 2022 13:19:12 -0400 X-MC-Unique: _Mgt6Ij6ORGrFasUXz0O6w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8B5EA1C04B64; Wed, 3 Aug 2022 17:18:47 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.202]) by smtp.corp.redhat.com (Postfix) with ESMTP id D103C1121314; Wed, 3 Aug 2022 17:18:44 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Jason Wang , Stefan Hajnoczi , Gautam Dawar , Cornelia Huck , Eli Cohen , Stefano Garzarella , Harpreet Singh Anand , Zhu Lingshan , Laurent Vivier , "Michael S. Tsirkin" , kvm@vger.kernel.org, Paolo Bonzini , Liuxiangdong , Parav Pandit , Cindy Lu , "Gonglei (Arei)" Subject: [PATCH v3 7/7] vdpa: Always start CVQ in SVQ mode Date: Wed, 3 Aug 2022 19:18:21 +0200 Message-Id: <20220803171821.481336-8-eperezma@redhat.com> In-Reply-To: <20220803171821.481336-1-eperezma@redhat.com> References: <20220803171821.481336-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Isolate control virtqueue in its own group, allowing to intercept control commands but letting dataplane run totally passthrough to the guest. Signed-off-by: Eugenio Pérez --- v3: * Make asid related queries print a warning instead of returning an error and stop the start of qemu. --- hw/virtio/vhost-vdpa.c | 3 +- net/vhost-vdpa.c | 144 +++++++++++++++++++++++++++++++++++++++-- 2 files changed, 142 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 131100841c..a4cb68862b 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -674,7 +674,8 @@ static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) { uint64_t features; uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2 | - 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH; + 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH | + 0x1ULL << VHOST_BACKEND_F_IOTLB_ASID; int r; if (vhost_vdpa_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) { diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index e3b65ed546..5f39f0edb5 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -37,6 +37,9 @@ typedef struct VhostVDPAState { /* Control commands shadow buffers */ void *cvq_cmd_out_buffer, *cvq_cmd_in_buffer; + /* Number of address spaces supported by the device */ + unsigned address_space_num; + /* The device always have SVQ enabled */ bool always_svq; bool started; @@ -100,6 +103,8 @@ static const uint64_t vdpa_svq_device_features = BIT_ULL(VIRTIO_NET_F_RSC_EXT) | BIT_ULL(VIRTIO_NET_F_STANDBY); +#define VHOST_VDPA_NET_CVQ_ASID 1 + VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) { VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); @@ -224,6 +229,101 @@ static NetClientInfo net_vhost_vdpa_info = { .check_peer_type = vhost_vdpa_check_peer_type, }; +static void vhost_vdpa_get_vring_group(int device_fd, + struct vhost_vring_state *state) +{ + int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, state); + if (unlikely(r < 0)) { + /* + * Assume all groups are 0, the consequences are the same and we will + * not abort device creation + */ + state->num = 0; + } +} + +/** + * Check if all the virtqueues of the virtio device are in a different vq than + * the last vq. VQ group of last group passed in cvq_group. + */ +static bool vhost_vdpa_cvq_group_is_independent(struct vhost_vdpa *v, + struct vhost_vring_state cvq_group) +{ + struct vhost_dev *dev = v->dev; + + for (int i = 0; i < (dev->vq_index_end - 1); ++i) { + struct vhost_vring_state vq_group = { + .index = i, + }; + + vhost_vdpa_get_vring_group(v->device_fd, &vq_group); + if (unlikely(vq_group.num == cvq_group.num)) { + warn_report("CVQ %u group is the same as VQ %u one (%u)", + cvq_group.index, vq_group.index, cvq_group.num); + return false; + } + } + + return true; +} + +static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, + unsigned vq_group, + unsigned asid_num) +{ + struct vhost_vring_state asid = { + .index = vq_group, + .num = asid_num, + }; + int ret; + + ret = ioctl(v->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); + if (unlikely(ret < 0)) { + warn_report("Can't set vq group %u asid %u, errno=%d (%s)", + asid.index, asid.num, errno, g_strerror(errno)); + } + return ret; +} + +static void vhost_vdpa_net_prepare(NetClientState *nc) +{ + VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); + struct vhost_vdpa *v = &s->vhost_vdpa; + struct vhost_dev *dev = v->dev; + struct vhost_vring_state cvq_group = { + .index = v->dev->vq_index_end - 1, + }; + int r; + + assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); + + if (dev->nvqs != 1 || dev->vq_index + dev->nvqs != dev->vq_index_end) { + /* Only interested in CVQ */ + return; + } + + if (s->always_svq) { + /* SVQ is already enabled */ + return; + } + + if (s->address_space_num < 2) { + v->shadow_vqs_enabled = false; + return; + } + + vhost_vdpa_get_vring_group(v->device_fd, &cvq_group); + if (!vhost_vdpa_cvq_group_is_independent(v, cvq_group)) { + v->shadow_vqs_enabled = false; + return; + } + + r = vhost_vdpa_set_address_space_id(v, cvq_group.num, + VHOST_VDPA_NET_CVQ_ASID); + v->shadow_vqs_enabled = r == 0; + s->vhost_vdpa.address_space_id = r == 0 ? 1 : 0; +} + static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) { VhostIOVATree *tree = v->iova_tree; @@ -431,6 +531,7 @@ static NetClientInfo net_vhost_vdpa_cvq_info = { .type = NET_CLIENT_DRIVER_VHOST_VDPA, .size = sizeof(VhostVDPAState), .receive = vhost_vdpa_receive, + .prepare = vhost_vdpa_net_prepare, .load = vhost_vdpa_net_load, .cleanup = vhost_vdpa_cleanup, .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, @@ -541,12 +642,38 @@ static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { .avail_handler = vhost_vdpa_net_handle_ctrl_avail, }; +static uint32_t vhost_vdpa_get_as_num(int vdpa_device_fd) +{ + uint64_t features; + unsigned num_as; + int r; + + r = ioctl(vdpa_device_fd, VHOST_GET_BACKEND_FEATURES, &features); + if (unlikely(r < 0)) { + warn_report("Cannot get backend features"); + return 1; + } + + if (!(features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) { + return 1; + } + + r = ioctl(vdpa_device_fd, VHOST_VDPA_GET_AS_NUM, &num_as); + if (unlikely(r < 0)) { + warn_report("Cannot retrieve number of supported ASs"); + return 1; + } + + return num_as; +} + static NetClientState *net_vhost_vdpa_init(NetClientState *peer, const char *device, const char *name, int vdpa_device_fd, int queue_pair_index, int nvqs, + unsigned nas, bool is_datapath, bool svq, VhostIOVATree *iova_tree) @@ -565,6 +692,7 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer, snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); s = DO_UPCAST(VhostVDPAState, nc, nc); + s->address_space_num = nas; s->vhost_vdpa.device_fd = vdpa_device_fd; s->vhost_vdpa.index = queue_pair_index; s->always_svq = svq; @@ -650,6 +778,8 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, g_autoptr(VhostIOVATree) iova_tree = NULL; NetClientState *nc; int queue_pairs, r, i = 0, has_cvq = 0; + unsigned num_as = 1; + bool svq_cvq; assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); opts = &netdev->u.vhost_vdpa; @@ -674,7 +804,13 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, goto err; } - if (opts->x_svq) { + svq_cvq = opts->x_svq; + if (has_cvq && !opts->x_svq) { + num_as = vhost_vdpa_get_as_num(vdpa_device_fd); + svq_cvq = num_as > 1; + } + + if (opts->x_svq || svq_cvq) { struct vhost_vdpa_iova_range iova_range; uint64_t invalid_dev_features = @@ -697,15 +833,15 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, for (i = 0; i < queue_pairs; i++) { ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, - vdpa_device_fd, i, 2, true, opts->x_svq, - iova_tree); + vdpa_device_fd, i, 2, num_as, true, + opts->x_svq, iova_tree); if (!ncs[i]) goto err; } if (has_cvq) { nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, - vdpa_device_fd, i, 1, false, + vdpa_device_fd, i, 1, num_as, false, opts->x_svq, iova_tree); if (!nc) goto err;