From nobody Thu Jul 10 00:29:24 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; envelope-from=libvir-list-bounces@redhat.com; helo=mx1.redhat.com; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=libvir-list-bounces@redhat.com; Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by mx.zohomail.com with SMTPS id 1496922818567319.9965263817538; Thu, 8 Jun 2017 04:53:38 -0700 (PDT) Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0D7A380F9E; Thu, 8 Jun 2017 11:53:37 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D5ED4909FB; Thu, 8 Jun 2017 11:53:36 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 9768B4BB7F; Thu, 8 Jun 2017 11:53:36 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id v58BooOU020703 for ; Thu, 8 Jun 2017 07:50:50 -0400 Received: by smtp.corp.redhat.com (Postfix) id 1C4037CDE7; Thu, 8 Jun 2017 11:50:50 +0000 (UTC) Received: from moe.brq.redhat.com (dhcp129-131.brq.redhat.com [10.34.129.131]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9877B7CE16 for ; Thu, 8 Jun 2017 11:50:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 0D7A380F9E Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=libvir-list-bounces@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 0D7A380F9E From: Michal Privoznik To: libvir-list@redhat.com Date: Thu, 8 Jun 2017 13:50:43 +0200 Message-Id: <1041136592bfb4e6d59d9ef0a0f5e69bfcab4621.1496922588.git.mprivozn@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-loop: libvir-list@redhat.com Subject: [libvirt] [PATCH 2/2] qemuDomainChangeNet: Forbid changing MTU X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Thu, 08 Jun 2017 11:53:37 +0000 (UTC) X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" https://bugzilla.redhat.com/show_bug.cgi?id=3D1447618 Currently, any attempt to change MTU on an interface that is plugged to a running domain is silently ignored. We should either do what's asked or error out. Well, we can update the host side of the interface, but we cannot change 'host_mtu' attribute for the virtio-net device. Therefore we have to error out. Signed-off-by: Michal Privoznik Reviewed-by: Laine Stump --- src/qemu/qemu_hotplug.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 8066acae3..d46956d98 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -3138,6 +3138,12 @@ qemuDomainChangeNet(virQEMUDriverPtr driver, /* vlan can be modified, and will be checked later */ /* linkstate can be modified */ =20 + if (olddev->mtu !=3D newdev->mtu) { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", + _("cannot modify MTU")); + goto cleanup; + } + /* allocate new actual device to compare to old - we will need to * free it if we fail for any reason */ --=20 2.13.0 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list