From patchwork Thu Mar 8 19:03:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ian Jackson X-Patchwork-Id: 10268711 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3AF7B6037E for ; Thu, 8 Mar 2018 19:05:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2D43B298C8 for ; Thu, 8 Mar 2018 19:05:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 21F6529AA3; Thu, 8 Mar 2018 19:05:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 70CAF298C8 for ; Thu, 8 Mar 2018 19:05:26 +0000 (UTC) Received: from localhost ([::1]:41043 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eu0qz-0002Jx-En for patchwork-qemu-devel@patchwork.kernel.org; Thu, 08 Mar 2018 14:05:25 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56958) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eu0pP-0000mN-Dm for qemu-devel@nongnu.org; Thu, 08 Mar 2018 14:03:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eu0pN-0002dQ-Ia for qemu-devel@nongnu.org; Thu, 08 Mar 2018 14:03:47 -0500 Received: from smtp.citrix.com ([66.165.176.89]:27694) by eggs.gnu.org with esmtps (TLS1.0:RSA_ARCFOUR_SHA1:16) (Exim 4.71) (envelope-from ) id 1eu0pN-0002cK-Bg for qemu-devel@nongnu.org; Thu, 08 Mar 2018 14:03:45 -0500 X-IronPort-AV: E=Sophos;i="5.47,441,1515456000"; d="scan'208";a="467121773" From: Ian Jackson To: Date: Thu, 8 Mar 2018 19:03:06 +0000 Message-ID: <1520535787-6223-12-git-send-email-ian.jackson@eu.citrix.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1520535787-6223-1-git-send-email-ian.jackson@eu.citrix.com> References: <1520535787-6223-1-git-send-email-ian.jackson@eu.citrix.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 66.165.176.89 Subject: [Qemu-devel] [PATCH 11/12] xen: Expect xenstore write to fail when restricted X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Stefano Stabellini , Ian Jackson , Ross Lagerwall , Anthony PERARD , xen-devel@lists.xenproject.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Ross Lagerwall Saving the current state to xenstore may fail when running restricted (in particular, after a migration). Therefore, don't report the error or exit when running restricted. Toolstacks that want to allow running QEMU restricted should instead make use of QMP events to listen for state changes. CC: Ian Jackson Signed-off-by: Ross Lagerwall Reviewed-by: Ian Jackson Acked-by: Anthony PERARD --- v6: New patch in this version of the series --- hw/xen/xen-common.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/hw/xen/xen-common.c b/hw/xen/xen-common.c index f73b416..8ede246 100644 --- a/hw/xen/xen-common.c +++ b/hw/xen/xen-common.c @@ -101,7 +101,12 @@ static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) } snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); - if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { + /* + * This call may fail when running restricted so don't make it fatal in + * that case. Toolstacks should instead use QMP to listen for state changes. + */ + if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) && + !xen_domid_restrict) { error_report("error recording dm state"); exit(1); }