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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 183BEC43334 for ; Thu, 23 Jun 2022 16:08:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232214AbiFWQIU (ORCPT ); Thu, 23 Jun 2022 12:08:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232178AbiFWQIJ (ORCPT ); Thu, 23 Jun 2022 12:08:09 -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 EA56695A3 for ; Thu, 23 Jun 2022 09:08:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1656000479; 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=aDt2oMiTl+iPhm1hmgcMB4/Xg7RW+ZLEgZ2fd31TX5c=; b=F51Xn7+ySosfd/fytFmtenq/OjxQnGg9spn0ndjJ1goH5jJWiTrDzxFuRocJ3nAmFyWNDx U6DOvX3NSVzxb85fmikwtyYq6m4i8Ke//nWWLg94+6Zd5+0DjoZBo39NMVPMKDnuZml29U BMYi8gv3YqBOW+3eE+zgNFSe/1vcL/o= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-172-LX__H52NNYSsJiv-Hy-vsw-1; Thu, 23 Jun 2022 12:07:55 -0400 X-MC-Unique: LX__H52NNYSsJiv-Hy-vsw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B97E2801E80; Thu, 23 Jun 2022 16:07:54 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.194.38]) by smtp.corp.redhat.com (Postfix) with ESMTP id 586082166B26; Thu, 23 Jun 2022 16:07:50 +0000 (UTC) From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: netdev@vger.kernel.org, Jason Wang , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, "Michael S. Tsirkin" Cc: Parav Pandit , Christophe JAILLET , lulu@redhat.com, tanuj.kamde@amd.com, Si-Wei Liu , Piotr.Uminski@intel.com, habetsm.xilinx@gmail.com, gautam.dawar@amd.com, pabloc@xilinx.com, Zhu Lingshan , lvivier@redhat.com, Longpeng , dinang@xilinx.com, martinh@xilinx.com, martinpo@xilinx.com, Eli Cohen , ecree.xilinx@gmail.com, Wu Zongyong , Stefano Garzarella , Dan Carpenter , hanand@xilinx.com, Xie Yongji , Zhang Min Subject: [PATCH v6 2/4] vhost-vdpa: introduce SUSPEND backend feature bit Date: Thu, 23 Jun 2022 18:07:36 +0200 Message-Id: <20220623160738.632852-3-eperezma@redhat.com> In-Reply-To: <20220623160738.632852-1-eperezma@redhat.com> References: <20220623160738.632852-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Userland knows if it can suspend the device or not by checking this feature bit. It's only offered if the vdpa driver backend implements the suspend() operation callback, and to offer it or userland to ack it if the backend does not offer that callback is an error. Signed-off-by: Eugenio Pérez --- drivers/vhost/vdpa.c | 16 +++++++++++++++- include/uapi/linux/vhost_types.h | 2 ++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 23dcbfdfa13b..3d636e192061 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -347,6 +347,14 @@ static long vhost_vdpa_set_config(struct vhost_vdpa *v, return 0; } +static bool vhost_vdpa_can_suspend(const struct vhost_vdpa *v) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + return ops->suspend; +} + static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep) { struct vdpa_device *vdpa = v->vdpa; @@ -577,7 +585,11 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, if (cmd == VHOST_SET_BACKEND_FEATURES) { if (copy_from_user(&features, featurep, sizeof(features))) return -EFAULT; - if (features & ~VHOST_VDPA_BACKEND_FEATURES) + if (features & ~(VHOST_VDPA_BACKEND_FEATURES | + BIT_ULL(VHOST_BACKEND_F_SUSPEND))) + return -EOPNOTSUPP; + if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) && + !vhost_vdpa_can_suspend(v)) return -EOPNOTSUPP; vhost_set_backend_features(&v->vdev, features); return 0; @@ -628,6 +640,8 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, break; case VHOST_GET_BACKEND_FEATURES: features = VHOST_VDPA_BACKEND_FEATURES; + if (vhost_vdpa_can_suspend(v)) + features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND); if (copy_to_user(featurep, &features, sizeof(features))) r = -EFAULT; break; diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h index 634cee485abb..1bdd6e363f4c 100644 --- a/include/uapi/linux/vhost_types.h +++ b/include/uapi/linux/vhost_types.h @@ -161,5 +161,7 @@ struct vhost_vdpa_iova_range { * message */ #define VHOST_BACKEND_F_IOTLB_ASID 0x3 +/* Device can be suspended */ +#define VHOST_BACKEND_F_SUSPEND 0x4 #endif -- 2.31.1