From patchwork Fri Jun 5 14:56:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 281285 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60636C433DF for ; Fri, 5 Jun 2020 15:07:19 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 27AFC20659 for ; Fri, 5 Jun 2020 15:07:19 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Fri, 5 Jun 2020 14:56:29 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-121.ams2.redhat.com [10.36.112.121]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D39125C583; Fri, 5 Jun 2020 14:56:28 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id BCA291138461; Fri, 5 Jun 2020 16:56:25 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH 10/16] qdev: Improve netdev property override error a bit Date: Fri, 5 Jun 2020 16:56:19 +0200 Message-Id: <20200605145625.2920920-11-armbru@redhat.com> In-Reply-To: <20200605145625.2920920-1-armbru@redhat.com> References: <20200605145625.2920920-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/05 03:35:49 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, berrange@redhat.com, ehabkost@redhat.com, qemu-block@nongnu.org, Jason Wang , mreitz@redhat.com, pbonzini@redhat.com, jsnow@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" qdev_prop_set_netdev() fails when the property already has a non-null value. Seems to go back to commit 30c367ed44 "qdev-properties-system.c: Allow vlan or netdev for -device, not both", v1.7.0. Board code doesn't expect failure, and crashes: $ qemu-system-x86_64 --nodefaults -nic user -netdev user,id=nic0 -global e1000.netdev=nic0 Unexpected error in error_set_from_qdev_prop_error() at /work/armbru/qemu/hw/core/qdev-properties.c:1101: qemu-system-x86_64: Property 'e1000.netdev' doesn't take value '__org.qemu.nic0 ' Aborted (core dumped) -device and device_add handle the failure: $ qemu-system-x86_64 -nodefaults -netdev user,id=net0 -netdev user,id=net1 -device e1000,netdev=net0,netdev=net1 qemu-system-x86_64: -device e1000,netdev=net0,netdev=net1: Property 'e1000.netdev' doesn't take value 'net1' $ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -netdev user,id=net0 -netdev user,id=net1 -global e1000.netdev=net0 QEMU 5.0.50 monitor - type 'help' for more information (qemu) qemu-system-x86_64: warning: netdev net0 has no peer qemu-system-x86_64: warning: netdev net1 has no peer device_add e1000,netdev=net1 Error: Property 'e1000.netdev' doesn't take value 'net1' Perhaps netdev property override could be made to work. Perhaps it should. I'm not the right guy to figure this out. What I can do is improve the error message a bit: (qemu) device_add e1000,netdev=net1 Error: -global e1000.netdev=... conflicts with netdev=net1 Cc: Jason Wang Signed-off-by: Markus Armbruster --- include/hw/qdev-properties.h | 2 ++ hw/core/qdev-properties-system.c | 30 +++++++++++++++++++++++++++--- hw/core/qdev-properties.c | 17 +++++++++++++++++ 3 files changed, 46 insertions(+), 3 deletions(-) diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h index f161604fb6..566419f379 100644 --- a/include/hw/qdev-properties.h +++ b/include/hw/qdev-properties.h @@ -248,6 +248,8 @@ void qdev_prop_set_macaddr(DeviceState *dev, const char *name, void qdev_prop_set_enum(DeviceState *dev, const char *name, int value); void qdev_prop_register_global(GlobalProperty *prop); +const GlobalProperty *qdev_find_global_prop(DeviceState *dev, + const char *name); int qdev_prop_check_globals(void); void qdev_prop_set_globals(DeviceState *dev); void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev, diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 9aa80495ee..20fd58e8f9 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -25,6 +25,28 @@ #include "sysemu/iothread.h" #include "sysemu/tpm_backend.h" +static bool check_non_null(DeviceState *dev, const char *name, + const void *old_val, const char *new_val, + Error **errp) +{ + const GlobalProperty *prop = qdev_find_global_prop(dev, name); + + if (!old_val) { + return true; + } + + if (prop) { + error_setg(errp, "-global %s.%s=... conflicts with %s=%s", + prop->driver, prop->property, name, new_val); + } else { + /* Error message is vague, but a better one would be hard */ + error_setg(errp, "%s=%s conflicts, and override is not implemented", + name, new_val); + } + return false; +} + + /* --- drive --- */ static void get_drive(Object *obj, Visitor *v, const char *name, void *opaque, @@ -299,14 +321,16 @@ static void set_netdev(Object *obj, Visitor *v, const char *name, } for (i = 0; i < queues; i++) { - if (peers[i]->peer) { err = -EEXIST; goto out; } - if (ncs[i]) { - err = -EINVAL; + /* + * TODO Should this really be an error? If no, the old value + * needs to be released before we store the new one. + */ + if (!check_non_null(dev, name, ncs[i], str, errp)) { goto out; } diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index cc924815da..8c8beb56b2 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -1181,6 +1181,23 @@ void qdev_prop_register_global(GlobalProperty *prop) g_ptr_array_add(global_props(), prop); } +const GlobalProperty *qdev_find_global_prop(DeviceState *dev, + const char *name) +{ + GPtrArray *props = global_props(); + const GlobalProperty *p; + int i; + + for (i = 0; i < props->len; i++) { + p = g_ptr_array_index(props, i); + if (object_dynamic_cast(OBJECT(dev), p->driver) + && !strcmp(p->property, name)) { + return p; + } + } + return NULL; +} + int qdev_prop_check_globals(void) { int i, ret = 0;