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Mon, 25 Dec 2023 05:42:16 -0800 From: Dragos Tatulea To: "Michael S . Tsirkin" , Jason Wang , Eugenio Perez Martin , Si-Wei Liu , , "Gal Pressman" CC: Dragos Tatulea , , , Parav Pandit , Xuan Zhuo Subject: [PATCH 1/2] vdpa: Track device suspended state Date: Mon, 25 Dec 2023 15:42:09 +0200 Message-ID: <20231225134210.151540-2-dtatulea@nvidia.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231225134210.151540-1-dtatulea@nvidia.com> References: <20231225134210.151540-1-dtatulea@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB56:EE_|MN2PR12MB4423:EE_ X-MS-Office365-Filtering-Correlation-Id: 6c480dc1-4a9b-4518-64ec-08dc054f5a66 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(396003)(346002)(39860400002)(136003)(376002)(230922051799003)(186009)(82310400011)(64100799003)(451199024)(1800799012)(46966006)(40470700004)(36840700001)(40480700001)(36756003)(40460700003)(6666004)(6636002)(70586007)(70206006)(86362001)(336012)(66574015)(426003)(1076003)(7636003)(356005)(82740400003)(26005)(83380400001)(2616005)(47076005)(41300700001)(2906002)(15650500001)(5660300002)(8936002)(8676002)(478600001)(36860700001)(54906003)(316002)(4326008)(110136005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Dec 2023 13:42:35.4795 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6c480dc1-4a9b-4518-64ec-08dc054f5a66 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB56.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4423 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786261592775269024 X-GMAIL-MSGID: 1786261592775269024 Set vdpa device suspended state on successful suspend. Clear it on successful resume and reset. The state will be locked by the vhost_vdpa mutex. The mutex is taken during suspend, resume and reset in vhost_vdpa_unlocked_ioctl. The exception is vhost_vdpa_open which does a device reset but that should be safe because it can only happen before the other ops. Signed-off-by: Dragos Tatulea Suggested-by: Eugenio Pérez --- drivers/vhost/vdpa.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index da7ec77cdaff..4c422be7d1e7 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -59,6 +59,7 @@ struct vhost_vdpa { int in_batch; struct vdpa_iova_range range; u32 batch_asid; + bool suspended; }; static DEFINE_IDA(vhost_vdpa_ida); @@ -232,6 +233,8 @@ static int _compat_vdpa_reset(struct vhost_vdpa *v) struct vdpa_device *vdpa = v->vdpa; u32 flags = 0; + v->suspended = false; + if (v->vdev.vqs) { flags |= !vhost_backend_has_feature(v->vdev.vqs[0], VHOST_BACKEND_F_IOTLB_PERSIST) ? @@ -590,11 +593,16 @@ static long vhost_vdpa_suspend(struct vhost_vdpa *v) { struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; + int ret; if (!ops->suspend) return -EOPNOTSUPP; - return ops->suspend(vdpa); + ret = ops->suspend(vdpa); + if (!ret) + v->suspended = true; + + return ret; } /* After a successful return of this ioctl the device resumes processing @@ -605,11 +613,16 @@ static long vhost_vdpa_resume(struct vhost_vdpa *v) { struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; + int ret; if (!ops->resume) return -EOPNOTSUPP; - return ops->resume(vdpa); + ret = ops->resume(vdpa); + if (!ret) + v->suspended = false; + + return ret; } static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,