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Sun, 16 Jul 2023 01:15:45 -0700 From: Avihai Horon To: CC: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Paolo Bonzini , Joao Martins , Yishai Hadas , Jason Gunthorpe , Maor Gottlieb , Kirti Wankhede , Tarun Gupta , Avihai Horon Subject: [PATCH for-8.2 1/6] vfio/migration: Move from STOP_COPY to STOP in vfio_save_cleanup() Date: Sun, 16 Jul 2023 11:15:36 +0300 Message-ID: <20230716081541.27900-2-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230716081541.27900-1-avihaih@nvidia.com> References: <20230716081541.27900-1-avihaih@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT058:EE_|BL1PR12MB5032:EE_ X-MS-Office365-Filtering-Correlation-Id: 81f87a5b-e1ef-46aa-6e9e-08db85d4e471 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:216.228.117.161; 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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, 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 2674f4bc47..8acd182a8b 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;