From patchwork Wed May 19 16:28:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 12267923 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85E02C433ED for ; Wed, 19 May 2021 16:35:29 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 1FCC561244 for ; Wed, 19 May 2021 16:35:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1FCC561244 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:37176 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ljPAO-0002Wp-3X for qemu-devel@archiver.kernel.org; Wed, 19 May 2021 12:35:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34368) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ljP54-0002Ub-H4 for qemu-devel@nongnu.org; Wed, 19 May 2021 12:29:59 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:39417) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ljP50-0005Cd-Ew for qemu-devel@nongnu.org; Wed, 19 May 2021 12:29:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621441793; 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=lN9E94Er5x6d1jL2uZjeSkSsMx9OR6z4PGUDVqDULLg=; b=MeM2BPLexVJWQTb8wkp/iNvsqQWrSULFJvX+9UKcaqvEnW7WovnNb1F+xdVXRpfzYmCv/l 9vnRmnncrk2tSTRKJJrVX9S2BjX+1eTAwt3H4fxEbKsydKT0NjpHkJp93AYBwW0u7NeLZQ UNlHWRFwNcwVjbxmUTYU5c16mM8IUwM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-405-s9GvOcEjMEOa3Uv9TLvyJg-1; Wed, 19 May 2021 12:29:51 -0400 X-MC-Unique: s9GvOcEjMEOa3Uv9TLvyJg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2223A801817; Wed, 19 May 2021 16:29:50 +0000 (UTC) Received: from eperezma.remote.csb (ovpn-113-65.ams2.redhat.com [10.36.113.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9355B5D6AC; Wed, 19 May 2021 16:29:46 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Subject: [RFC v3 05/29] virtio: Add VIRTIO_F_QUEUE_STATE Date: Wed, 19 May 2021 18:28:39 +0200 Message-Id: <20210519162903.1172366-6-eperezma@redhat.com> In-Reply-To: <20210519162903.1172366-1-eperezma@redhat.com> References: <20210519162903.1172366-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eperezma@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.39, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Parav Pandit , "Michael S. Tsirkin" , Jason Wang , Juan Quintela , Markus Armbruster , virtualization@lists.linux-foundation.org, Harpreet Singh Anand , Xiao W Wang , Stefan Hajnoczi , Eli Cohen , Michael Lilja , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Implementation of RFC of device state capability: https://lists.oasis-open.org/archives/virtio-comment/202012/msg00005.html With this capability, vdpa device can reset it's index so it can start consuming from shadow virtqueue (SVQ), that start with state 0. Another approach would be to make SVQ to start forwarding from the state of the device when the later is stopped, but this device capability is needed at the destination of live migration anyway. The use case is to test SVQ with virtio-pci vdpa (vp_vdpa) with nested virtualization. Spawning a L0 qemu with a virtio-net device, use vp_vdpa driver to handle it in the guest, and then spawn a L1 qemu using that vdpa device. When L1 qemu calls device to set a new state though vdpa ioctl, vp_vdpa should set each queue state though virtio VIRTIO_PCI_COMMON_Q_AVAIL_STATE. Since this is only for testing vhost-vdpa, it's added here before of proposing to kernel code. No effort is done for checking that device can actually change its state, its layout, or if the device even supports to change state at all. These will be added in the future. Also, a modified version of vp_vdpa that allows to set these in PCI config is needed. TODO: Check for feature enabled and split in virtio pci config Signed-off-by: Eugenio Pérez --- hw/virtio/virtio-pci.h | 1 + include/hw/virtio/virtio.h | 4 +++- include/standard-headers/linux/virtio_config.h | 3 +++ include/standard-headers/linux/virtio_pci.h | 2 ++ hw/virtio/virtio-pci.c | 9 +++++++++ 5 files changed, 18 insertions(+), 1 deletion(-) diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h index d7d5d403a9..69e34449cd 100644 --- a/hw/virtio/virtio-pci.h +++ b/hw/virtio/virtio-pci.h @@ -115,6 +115,7 @@ typedef struct VirtIOPCIQueue { uint32_t desc[2]; uint32_t avail[2]; uint32_t used[2]; + uint16_t state; } VirtIOPCIQueue; struct VirtIOPCIProxy { diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index c2c7cee993..dfcc7d8350 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -289,7 +289,9 @@ typedef struct VirtIORNGConf VirtIORNGConf; DEFINE_PROP_BIT64("iommu_platform", _state, _field, \ VIRTIO_F_IOMMU_PLATFORM, false), \ DEFINE_PROP_BIT64("packed", _state, _field, \ - VIRTIO_F_RING_PACKED, false) + VIRTIO_F_RING_PACKED, false), \ + DEFINE_PROP_BIT64("save_restore_q_state", _state, _field, \ + VIRTIO_F_QUEUE_STATE, true) hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n); diff --git a/include/standard-headers/linux/virtio_config.h b/include/standard-headers/linux/virtio_config.h index 22e3a85f67..59fad3eb45 100644 --- a/include/standard-headers/linux/virtio_config.h +++ b/include/standard-headers/linux/virtio_config.h @@ -90,4 +90,7 @@ * Does the device support Single Root I/O Virtualization? */ #define VIRTIO_F_SR_IOV 37 + +/* Device support save and restore virtqueue state */ +#define VIRTIO_F_QUEUE_STATE 40 #endif /* _LINUX_VIRTIO_CONFIG_H */ diff --git a/include/standard-headers/linux/virtio_pci.h b/include/standard-headers/linux/virtio_pci.h index db7a8e2fcb..c8d9802a87 100644 --- a/include/standard-headers/linux/virtio_pci.h +++ b/include/standard-headers/linux/virtio_pci.h @@ -164,6 +164,7 @@ struct virtio_pci_common_cfg { uint32_t queue_avail_hi; /* read-write */ uint32_t queue_used_lo; /* read-write */ uint32_t queue_used_hi; /* read-write */ + uint16_t queue_avail_state; /* read-write */ }; /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */ @@ -202,6 +203,7 @@ struct virtio_pci_cfg_cap { #define VIRTIO_PCI_COMMON_Q_AVAILHI 44 #define VIRTIO_PCI_COMMON_Q_USEDLO 48 #define VIRTIO_PCI_COMMON_Q_USEDHI 52 +#define VIRTIO_PCI_COMMON_Q_AVAIL_STATE 56 #endif /* VIRTIO_PCI_NO_MODERN */ diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 883045a223..ddb6fff098 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1216,6 +1216,9 @@ static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, case VIRTIO_PCI_COMMON_Q_USEDHI: val = proxy->vqs[vdev->queue_sel].used[1]; break; + case VIRTIO_PCI_COMMON_Q_AVAIL_STATE: + val = virtio_queue_get_last_avail_idx(vdev, vdev->queue_sel); + break; default: val = 0; } @@ -1298,6 +1301,8 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr, proxy->vqs[vdev->queue_sel].avail[0], ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | proxy->vqs[vdev->queue_sel].used[0]); + virtio_queue_set_last_avail_idx(vdev, vdev->queue_sel, + proxy->vqs[vdev->queue_sel].state); proxy->vqs[vdev->queue_sel].enabled = 1; } else { virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val); @@ -1321,6 +1326,9 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr, case VIRTIO_PCI_COMMON_Q_USEDHI: proxy->vqs[vdev->queue_sel].used[1] = val; break; + case VIRTIO_PCI_COMMON_Q_AVAIL_STATE: + proxy->vqs[vdev->queue_sel].state = val; + break; default: break; } @@ -1900,6 +1908,7 @@ static void virtio_pci_reset(DeviceState *qdev) proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; + proxy->vqs[i].state = 0; } if (pci_is_express(dev)) {