From patchwork Sat Nov 9 10:14:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 13869407 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 93430D5E364 for ; Sat, 9 Nov 2024 10:28:05 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t9iaI-0004Sv-2p; Sat, 09 Nov 2024 05:20:55 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9iWW-0006M9-PF; Sat, 09 Nov 2024 05:16:59 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9iWV-00086n-4G; Sat, 09 Nov 2024 05:16:56 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id B0690A1400; Sat, 9 Nov 2024 13:13:50 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 5CBB0167EEB; Sat, 9 Nov 2024 13:14:45 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Avihai Horon , =?utf-8?q?C?= =?utf-8?q?=C3=A9dric_Le_Goater?= , Michael Tokarev Subject: [Stable-8.2.8 27/49] vfio/migration: Report only stop-copy size in vfio_state_pending_exact() Date: Sat, 9 Nov 2024 13:14:18 +0300 Message-Id: <20241109101443.312701-27-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Avihai Horon vfio_state_pending_exact() is used to update migration core how much device data is left for the device migration. Currently, the sum of pre-copy and stop-copy sizes of the VFIO device are reported. The pre-copy size is obtained via the VFIO_MIG_GET_PRECOPY_INFO ioctl, which returns the amount of device data available to be transferred while the device is in the PRE_COPY states. The stop-copy size is obtained via the VFIO_DEVICE_FEATURE_MIG_DATA_SIZE ioctl, which returns the total amount of device data left to be transferred in order to complete the device migration. According to the above, current implementation is wrong -- it reports extra overlapping data because pre-copy size is already contained in stop-copy size. Fix it by reporting only stop-copy size. Fixes: eda7362af959 ("vfio/migration: Add VFIO migration pre-copy support") Signed-off-by: Avihai Horon Reviewed-by: Cédric Le Goater (cherry picked from commit 3b5948f808e3b99aedfa0aff45cffbe8b7ec07ed) Signed-off-by: Michael Tokarev diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 28d422b39f..28240c42ce 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -480,9 +480,6 @@ static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy, if (vfio_device_state_is_precopy(vbasedev)) { vfio_query_precopy_size(migration); - - *must_precopy += - migration->precopy_init_size + migration->precopy_dirty_size; } trace_vfio_state_pending_exact(vbasedev->name, *must_precopy, *can_postcopy,