From nobody Wed Nov 13 12:02:51 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.libvirt.org designates 8.43.85.245 as permitted sender) client-ip=8.43.85.245; envelope-from=devel-bounces@lists.libvirt.org; helo=lists.libvirt.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.libvirt.org designates 8.43.85.245 as permitted sender) smtp.mailfrom=devel-bounces@lists.libvirt.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.libvirt.org (lists.libvirt.org [8.43.85.245]) by mx.zohomail.com with SMTPS id 1722605112397252.38352754313473; Fri, 2 Aug 2024 06:25:12 -0700 (PDT) Received: by lists.libvirt.org (Postfix, from userid 996) id 2CB7E1439; Fri, 2 Aug 2024 09:25:11 -0400 (EDT) Received: from lists.libvirt.org (localhost [IPv6:::1]) by lists.libvirt.org (Postfix) with ESMTP id 3E234146C; Fri, 2 Aug 2024 09:23:59 -0400 (EDT) Received: by lists.libvirt.org (Postfix, from userid 996) id 5F918137C; Fri, 2 Aug 2024 09:23:53 -0400 (EDT) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.libvirt.org (Postfix) with ESMTPS id C5976139D for ; Fri, 2 Aug 2024 09:23:52 -0400 (EDT) Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-66-KEcEDv5wO5uKGocQo5rwKQ-1; Fri, 02 Aug 2024 09:23:51 -0400 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4FC441955D5D for ; Fri, 2 Aug 2024 13:23:50 +0000 (UTC) Received: from speedmetal.redhat.com (unknown [10.45.242.16]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 6706F1955D47 for ; Fri, 2 Aug 2024 13:23:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on lists.libvirt.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE autolearn=unavailable autolearn_force=no version=3.4.4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722605032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=arBs8qWM7UBc+RiwmYbo+eqJsZ1NVzdEWS+QQElgNQg=; b=Ng8O8VpOf+ivcXR3On7Zt4g5Rp3kQL8WbMJNmqhUpTMD4z1VtM6Ia+zNMbE1ynfZW2Nnbw ov1TJERanF7exXTDX0qtSr0BpQc6N1iF7vo+BZVoQxTPBJmAVZkydV2n9O1HGw4txyYVNe bBjQuiWzP2fcnN/3Gjf+GMSH9xgJZEk= X-MC-Unique: KEcEDv5wO5uKGocQo5rwKQ-1 From: Peter Krempa To: devel@lists.libvirt.org Subject: [PATCH v5 02/11] qemu: Introduce shared_filesystems configuration option Date: Fri, 2 Aug 2024 15:23:35 +0200 Message-ID: In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Message-ID-Hash: 4TK626YNPM526WMU4HZFLVZKQCV35VP6 X-Message-ID-Hash: 4TK626YNPM526WMU4HZFLVZKQCV35VP6 X-MailFrom: pkrempa@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-config-1; header-match-config-2; header-match-config-3; header-match-devel.lists.libvirt.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; suspicious-header X-Mailman-Version: 3.2.2 Precedence: list List-Id: Development discussions about the libvirt library & tools Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1722605113969116600 Content-Type: text/plain; charset="utf-8" From: Andrea Bolognani As explained in the comment, this can help in scenarios where a shared filesystem can't be detected as such by libvirt, by giving the admin the opportunity to provide this information manually. Signed-off-by: Andrea Bolognani Signed-off-by: Peter Krempa --- src/qemu/libvirtd_qemu.aug | 3 +++ src/qemu/qemu.conf.in | 26 +++++++++++++++++++++++++ src/qemu/qemu_conf.c | 31 ++++++++++++++++++++++++++++++ src/qemu/qemu_conf.h | 2 ++ src/qemu/test_libvirtd_qemu.aug.in | 5 +++++ 5 files changed, 67 insertions(+) diff --git a/src/qemu/libvirtd_qemu.aug b/src/qemu/libvirtd_qemu.aug index 2b6526538f..1377fd89cc 100644 --- a/src/qemu/libvirtd_qemu.aug +++ b/src/qemu/libvirtd_qemu.aug @@ -143,6 +143,8 @@ module Libvirtd_qemu =3D let storage_entry =3D bool_entry "storage_use_nbdkit" + let filesystem_entry =3D str_array_entry "shared_filesystems" + (* Entries that used to exist in the config which are now * deleted. We keep on parsing them so we don't break * ability to parse old configs after upgrade @@ -173,6 +175,7 @@ module Libvirtd_qemu =3D | swtpm_entry | capability_filters_entry | storage_entry + | filesystem_entry | obsolete_entry let comment =3D [ label "#comment" . del /#[ \t]*/ "# " . store /([^ \= t\n][^\n]*)?/ . del /\n/ "\n" ] diff --git a/src/qemu/qemu.conf.in b/src/qemu/qemu.conf.in index 6bc2140dcb..b93024a489 100644 --- a/src/qemu/qemu.conf.in +++ b/src/qemu/qemu.conf.in @@ -985,3 +985,29 @@ # note that the default might change in future releases. # #storage_use_nbdkit =3D @USE_NBDKIT_DEFAULT@ + +# libvirt will normally prevent migration if the storage backing the VM is= not +# on a shared filesystems. Sometimes, however, the storage *is* shared des= pite +# not being detected as such: for example, this is the case when one of the +# hosts involved in the migration is exporting its local storage to the ot= her +# one via NFS. +# +# Any directory listed here will be assumed to live on a shared filesystem, +# making migration possible in scenarios such as the one described above. = It's +# the system's administrator responsibility to ensure that other hosts can +# access this directory. +# +# This option is not symmetrical and should only be used on hosts where the +# storage is being exported from. It must not be used on hosts accessing t= he +# storage via a remote protocol. +# +# NOTE: this option is intended to help in very specific scenarios that are +# rarely encountered. If you find yourself reaching for this option, consi= der +# reworking your environment so that it follows a more common architecture +# rather than using it. +# +#shared_filesystems =3D [ +# "/path/to/images", +# "/path/to/nvram", +# "/path/to/swtpm" +#] diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index b36bede6c3..9c51da6cca 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -374,6 +374,8 @@ static void virQEMUDriverConfigDispose(void *obj) g_strfreev(cfg->capabilityfilters); + g_strfreev(cfg->sharedFilesystems); + g_free(cfg->deprecationBehavior); } @@ -1084,6 +1086,32 @@ virQEMUDriverConfigLoadStorageEntry(virQEMUDriverCon= fig *cfg, } +static int +virQEMUDriverConfigLoadFilesystemEntry(virQEMUDriverConfig *cfg, + virConf *conf) +{ + char **iter; + + if (virConfGetValueStringList(conf, "shared_filesystems", false, + &cfg->sharedFilesystems) < 0) + return -1; + + if (!cfg->sharedFilesystems) + return 0; + + /* The paths provided by the user might contain trailing slashes + * and other fun diversions, which would break the naive string + * comparisons that we're later going to use them for */ + for (iter =3D cfg->sharedFilesystems; *iter; iter++) { + char *canon =3D virFileCanonicalizePath(*iter); + g_free(*iter); + *iter =3D canon; + } + + return 0; +} + + int virQEMUDriverConfigLoadFile(virQEMUDriverConfig *cfg, const char *filename, bool privileged) @@ -1158,6 +1186,9 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfig *= cfg, if (virQEMUDriverConfigLoadStorageEntry(cfg, conf) < 0) return -1; + if (virQEMUDriverConfigLoadFilesystemEntry(cfg, conf) < 0) + return -1; + return 0; } diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h index aa1e1a626c..b9cdc75c6b 100644 --- a/src/qemu/qemu_conf.h +++ b/src/qemu/qemu_conf.h @@ -233,6 +233,8 @@ struct _virQEMUDriverConfig { bool storageUseNbdkit; virQEMUSchedCore schedCore; + + char **sharedFilesystems; }; G_DEFINE_AUTOPTR_CLEANUP_FUNC(virQEMUDriverConfig, virObjectUnref); diff --git a/src/qemu/test_libvirtd_qemu.aug.in b/src/qemu/test_libvirtd_qe= mu.aug.in index b97e6de11e..69fdae215a 100644 --- a/src/qemu/test_libvirtd_qemu.aug.in +++ b/src/qemu/test_libvirtd_qemu.aug.in @@ -119,3 +119,8 @@ module Test_libvirtd_qemu =3D { "deprecation_behavior" =3D "none" } { "sched_core" =3D "none" } { "storage_use_nbdkit" =3D "@USE_NBDKIT_DEFAULT@" } +{ "shared_filesystems" + { "1" =3D "/path/to/images" } + { "2" =3D "/path/to/nvram" } + { "3" =3D "/path/to/swtpm" } +} --=20 2.45.2