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Mon, 3 Apr 2023 06:00:01 -0700 From: Avihai Horon To: CC: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Keqian Zhu , Joao Martins , "Avihai Horon" Subject: [PATCH] vfio/migration: Skip log_sync during migration SETUP state Date: Mon, 3 Apr 2023 16:00:00 +0300 Message-ID: <20230403130000.6422-1-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000C97D:EE_|SN7PR12MB6982:EE_ X-MS-Office365-Filtering-Correlation-Id: a57cdf08-eb51-4e2d-b82f-08db3443626e 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:216.228.118.233; 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envelope-from=avihaih@nvidia.com; helo=NAM11-DM6-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 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 Currently, VFIO log_sync can be issued while migration is in SETUP state. However, doing this log_sync is at best redundant and at worst can fail. Redundant -- all RAM is marked dirty in migration SETUP state and is transferred only after migration is set to ACTIVE state, so doing log_sync during migration SETUP is pointless. Can fail -- there is a time window, between setting migration state to SETUP and starting dirty tracking by RAM save_live_setup handler, during which dirty tracking is still not started. Any VFIO log_sync call that is issued during this time window will fail. For example, this error can be triggered by migrating a VM when a GUI is active, which constantly calls log_sync. Fix it by skipping VFIO log_sync while migration is in SETUP state. Fixes: 758b96b61d5c ("vfio/migrate: Move switch of dirty tracking into vfio_memory_listener") Signed-off-by: Avihai Horon --- hw/vfio/common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 4d01ea3515..78358ede27 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -478,7 +478,8 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container) VFIODevice *vbasedev; MigrationState *ms = migrate_get_current(); - if (!migration_is_setup_or_active(ms->state)) { + if (ms->state != MIGRATION_STATUS_ACTIVE && + ms->state != MIGRATION_STATUS_DEVICE) { return false; }