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Mon, 26 Jun 2023 01:23:58 -0700 From: Avihai Horon To: CC: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Juan Quintela , Peter Xu , Leonardo Bras , Zhenzhong Duan , Yishai Hadas , Jason Gunthorpe , Maor Gottlieb , Avihai Horon , Kirti Wankhede , Tarun Gupta , Joao Martins Subject: [PATCH 1/3] vfio/migration: Move from STOP_COPY to STOP in vfio_save_cleanup() Date: Mon, 26 Jun 2023 11:23:51 +0300 Message-ID: <20230626082353.18535-2-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230626082353.18535-1-avihaih@nvidia.com> References: <20230626082353.18535-1-avihaih@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT073:EE_|DM4PR12MB5865:EE_ X-MS-Office365-Filtering-Correlation-Id: 35f4e4c1-bd4d-4a31-65a1-08db761eb8c4 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; 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envelope-from=avihaih@nvidia.com; helo=NAM02-SN1-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Changing the device state from STOP_COPY to STOP can take time as the device may need to free resources and do other operations as part of the transition. Currently, this is done in vfio_save_complete_precopy() and therefore it is counted in the migration downtime. To avoid this, change the device state from STOP_COPY to STOP in vfio_save_cleanup(), which is called after migration has completed and thus is not part of migration downtime. Signed-off-by: Avihai Horon --- hw/vfio/migration.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index acbf0bb7ab..a8bfbe4b89 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -383,6 +383,19 @@ static void vfio_save_cleanup(void *opaque) VFIODevice *vbasedev = opaque; VFIOMigration *migration = vbasedev->migration; + /* + * Changing device state from STOP_COPY to STOP can take time. Do it here, + * after migration has completed, so it won't increase downtime. + */ + if (migration->device_state == VFIO_DEVICE_STATE_STOP_COPY) { + /* + * If setting the device in STOP state fails, the device should be + * reset. To do so, use ERROR state as a recover state. + */ + vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP, + VFIO_DEVICE_STATE_ERROR); + } + g_free(migration->data_buffer); migration->data_buffer = NULL; migration->precopy_init_size = 0; @@ -508,12 +521,6 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) return ret; } - /* - * If setting the device in STOP state fails, the device should be reset. - * To do so, use ERROR state as a recover state. - */ - ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP, - VFIO_DEVICE_STATE_ERROR); trace_vfio_save_complete_precopy(vbasedev->name, ret); return ret;