From mboxrd@z Thu Jan 1 00:00:00 1970 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 EB41FC83F03 for ; Fri, 4 Jul 2025 08:51:29 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uXc3x-00084S-9v; Fri, 04 Jul 2025 04:46:29 -0400 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 1uXc3p-0007yc-6d for qemu-devel@nongnu.org; Fri, 04 Jul 2025 04:46:22 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uXc3n-0000cm-9w for qemu-devel@nongnu.org; Fri, 04 Jul 2025 04:46:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1751618778; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BM5vNjDCBW3H5iIwmayDEVixhk6Q2Pc3CcXMJe0BoB8=; b=CvtT1z1w12UeJaDJbhK/e9F0f6Xfhdtq1TLzJ4aKZcVldjduEbV3fLRc+ovPuvU4PIdUEy V+vDfAYnXRoOnFsc9rwdANxpFV9RAld5Q4CcSI4salykX34Du2b6s31L5+SvgUzjYKf0C4 j2mf3SLAdmPNG/iTd2H2UGPyB8P8Y8g= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-592-T2ZyadhHNt23sir9LKjU9g-1; Fri, 04 Jul 2025 04:46:15 -0400 X-MC-Unique: T2ZyadhHNt23sir9LKjU9g-1 X-Mimecast-MFC-AGG-ID: T2ZyadhHNt23sir9LKjU9g_1751618774 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 52F2E1809C83; Fri, 4 Jul 2025 08:46:14 +0000 (UTC) Received: from corto.redhat.com (unknown [10.44.32.43]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 4D2BE19560A7; Fri, 4 Jul 2025 08:46:12 +0000 (UTC) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , Steve Sistare , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Zhenzhong Duan Subject: [PULL 15/27] vfio/iommufd: invariant device name Date: Fri, 4 Jul 2025 10:45:16 +0200 Message-ID: <20250704084528.1412959-16-clg@redhat.com> In-Reply-To: <20250704084528.1412959-1-clg@redhat.com> References: <20250704084528.1412959-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.237, 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: Steve Sistare cpr-transfer will use the device name as a key to find the value of the device descriptor in new QEMU. However, if the descriptor number is specified by a command-line fd parameter, then vfio_device_get_name creates a name that includes the fd number. This causes a chicken-and-egg problem: new QEMU must know the fd number to construct a name to find the fd number. To fix, create an invariant name based on the id command-line parameter, if id is defined. The user will need to provide such an id to use CPR. Signed-off-by: Steve Sistare Reviewed-by: Cédric Le Goater Reviewed-by: Zhenzhong Duan Link: https://lore.kernel.org/qemu-devel/1751493538-202042-10-git-send-email-steven.sistare@oracle.com Signed-off-by: Cédric Le Goater --- hw/vfio/device.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/hw/vfio/device.c b/hw/vfio/device.c index d91c695b69b67ff8f09f590d3fcca8f30f259170..3cd365fb8b10a180c454d07efb4b7d4e6f403046 100644 --- a/hw/vfio/device.c +++ b/hw/vfio/device.c @@ -316,12 +316,17 @@ bool vfio_device_get_name(VFIODevice *vbasedev, Error **errp) error_setg(errp, "Use FD passing only with iommufd backend"); return false; } - /* - * Give a name with fd so any function printing out vbasedev->name - * will not break. - */ if (!vbasedev->name) { - vbasedev->name = g_strdup_printf("VFIO_FD%d", vbasedev->fd); + + if (vbasedev->dev->id) { + vbasedev->name = g_strdup(vbasedev->dev->id); + return true; + } else { + /* + * Assign a name so any function printing it will not break. + */ + vbasedev->name = g_strdup_printf("VFIO_FD%d", vbasedev->fd); + } } } -- 2.50.0