From mboxrd@z Thu Jan 1 00:00:00 1970 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 mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by smtp.lore.kernel.org (Postfix) with ESMTP id ECB50ECD6C1 for ; Wed, 11 Feb 2026 16:16:11 +0000 (UTC) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 8A9E940698; Wed, 11 Feb 2026 17:15:36 +0100 (CET) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mails.dpdk.org (Postfix) with ESMTP id 543AC4067E for ; Wed, 11 Feb 2026 17:15:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1770826534; 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=Xb9DqOm/buOL6ptjb4REFLDdQvbdIaFuIWi0lVsAXok=; b=aoyAzmsFYNGBO/vpFd/FWj5uxVqJRINFl5sPRWMN1AoNI4+CgRfxotcXDooI5IbAV3R/mZ my1LXETRDH5PX/MXEpD02fAnUy1HEDJfbEkURzUGoWTuyJ3Mef4pUPFC39tdMd53hUu8Iw mS8rXH4ceVL00uON7r8/uI7lLuLpubg= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-249-AtdbcXdHNEOSYNehGfh3Jg-1; Wed, 11 Feb 2026 11:15:33 -0500 X-MC-Unique: AtdbcXdHNEOSYNehGfh3Jg-1 X-Mimecast-MFC-AGG-ID: AtdbcXdHNEOSYNehGfh3Jg_1770826532 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A9FB31956056; Wed, 11 Feb 2026 16:15:32 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.226.212]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id ECEA618004AD; Wed, 11 Feb 2026 16:15:29 +0000 (UTC) From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: Maxime Coquelin Cc: jasowang@redhat.com, david.marchand@redhat.com, mst@redhat.com, dev@dpdk.org, Yongji Xie , chenbox@nvidia.com Subject: [RFC 10/10] vhost: Support vduse suspend feature Date: Wed, 11 Feb 2026 17:14:57 +0100 Message-ID: <20260211161457.2703686-11-eperezma@redhat.com> In-Reply-To: <20260211161457.2703686-1-eperezma@redhat.com> References: <20260211161457.2703686-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: D0keiD9NiTh5skYMd9k6tNWJx-cfGfS17WxlbNON8l8_1770826532 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org From: Super User Add support for the VDUSE_F_SUSPEND feature. The suspend feature allows the driver to stop the device from processing the virtqueues. This ensures that the virtqueue state can be fetched reliably in a live migration. Signed-off-by: Eugenio Pérez --- kernel/linux/uapi/linux/vduse.h | 4 ++++ lib/vhost/vduse.c | 40 ++++++++++++++++++++++++++++++++- lib/vhost/vhost.h | 1 + 3 files changed, 44 insertions(+), 1 deletion(-) diff --git a/kernel/linux/uapi/linux/vduse.h b/kernel/linux/uapi/linux/vduse.h index 156446cdc712..ca510027cac2 100644 --- a/kernel/linux/uapi/linux/vduse.h +++ b/kernel/linux/uapi/linux/vduse.h @@ -21,6 +21,9 @@ /* The VDUSE instance expects a request for vq ready */ #define VDUSE_F_QUEUE_READY 0 +/* The VDUSE instance expects a request for suspend */ +#define VDUSE_F_SUSPEND 1 + /* * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION). * This is used for future extension. @@ -338,6 +341,7 @@ enum vduse_req_type { VDUSE_UPDATE_IOTLB, VDUSE_SET_VQ_GROUP_ASID, VDUSE_SET_VQ_READY, + VDUSE_SUSPEND, }; /** diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c index 9c0801453605..2f421a06a2d2 100644 --- a/lib/vhost/vduse.c +++ b/lib/vhost/vduse.c @@ -46,7 +46,8 @@ static const char * const vduse_reqs_str[] = { (id < RTE_DIM(vduse_reqs_str) ? \ vduse_reqs_str[id] : "Unknown") -static const uint64_t supported_vduse_features = RTE_BIT64(VDUSE_F_QUEUE_READY); +static const uint64_t supported_vduse_features = + RTE_BIT64(VDUSE_F_QUEUE_READY) | RTE_BIT64(VDUSE_F_SUSPEND); static uint64_t vduse_vq_to_group(struct virtio_net *dev, struct vhost_virtqueue *vq) { @@ -521,6 +522,12 @@ vduse_events_handler(int fd, void *arg, int *close __rte_unused) resp.result = VDUSE_REQ_RESULT_FAILED; break; } + if (dev->vduse_suspended) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "SET_VQ_READY received on suspended device"); + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } i = req.vq_ready.num; vq = dev->virtqueue[i]; @@ -544,6 +551,37 @@ vduse_events_handler(int fd, void *arg, int *close __rte_unused) vq->enabled = req.vq_ready.ready; resp.result = VDUSE_REQ_RESULT_OK; break; + case VDUSE_SUSPEND: + if (dev->vduse_api_ver < 2) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "Unexpected suspend message with ver %"PRIu64, + dev->vduse_api_ver); + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + if (!(dev->vduse_features & RTE_BIT64(VDUSE_F_SUSPEND))) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "Unnegotiated suspend message"); + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK)) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "Unexpected suspend message with no DRIVER_OK"); + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + for (i = 0; dev->notify_ops->vring_state_changed && + i < dev->nr_vring; i++) { + if (dev->virtqueue[i] == dev->cvq) + continue; + + dev->notify_ops->vring_state_changed(dev->vid, i, false); + } + dev->vduse_suspended = true; + resp.result = VDUSE_REQ_RESULT_OK; + break; + default: resp.result = VDUSE_REQ_RESULT_FAILED; break; diff --git a/lib/vhost/vhost.h b/lib/vhost/vhost.h index ce2e1a271c6f..73f0c9397cd0 100644 --- a/lib/vhost/vhost.h +++ b/lib/vhost/vhost.h @@ -534,6 +534,7 @@ struct __rte_cache_aligned virtio_net { int vduse_dev_fd; uint64_t vduse_api_ver; uint64_t vduse_features; + bool vduse_suspended; struct vhost_virtqueue *cvq; -- 2.53.0