From patchwork Thu Jan 16 08:43:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13941476 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 E9902C02183 for ; Thu, 16 Jan 2025 08:46:13 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tYLTu-0006uB-Et; Thu, 16 Jan 2025 03:44:02 -0500 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 1tYLTm-0006pQ-Mz; Thu, 16 Jan 2025 03:43:55 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tYLTg-0006nm-Pt; Thu, 16 Jan 2025 03:43:54 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description; bh=DR5mFAf4m4LBhzxhAqxWzplLWjQI40VGtvjtZ6+t6c4=; b=RWoIb912hQmTElYRyXcO6i7n/6 7aQ9mKlddz4vnYA/tzUwlragwZcQDpyLdZkOYQnx8QY0PAzPrbo/hFyjICLNx3nX5LK9sdaCEnkYc ibJ5bH5g9pycHzKmZKbT669twWv62Tj28hLXUCyVEebvwnvm4GnObo2c7OOK+s6st3nY9Lb6MQSI6 F3DZ2j8vrn+TZ1sBjPjnYFrB5ZG3DYRJrH8+zBq3keHAVzKms0GxU7ZR241ztLkCkdifRfCxHVOho erHBwyIjIDYQMok8bacin7Vczk5KiVXXyGBZczbCYCUG1+gk3lHW2T01z7ILoGDU/kIJ4kjcQmLYW PsynnlsQ==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tYLTc-0000000AkbC-3UJK; Thu, 16 Jan 2025 08:43:44 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tYLTc-00000007pHh-2K0i; Thu, 16 Jan 2025 08:43:44 +0000 From: David Woodhouse To: Stefan Hajnoczi , qemu-devel@nongnu.org Cc: Stefano Stabellini , Anthony PERARD , Paul Durrant , "Edgar E. Iglesias" , Kevin Wolf , Hanna Reitz , =?utf-8?q?M?= =?utf-8?q?arc-Andr=C3=A9_Lureau?= , Paolo Bonzini , Jason Wang , xen-devel@lists.xenproject.org, qemu-block@nongnu.org, Phil Dennis-Jordan , Roger Pau Monne , David Woodhouse , Anthony PERARD Subject: [PULL 2/8] xen: do not use '%ms' scanf specifier Date: Thu, 16 Jan 2025 08:43:26 +0000 Message-ID: <20250116084332.1864967-3-dwmw2@infradead.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250116084332.1864967-1-dwmw2@infradead.org> References: <20250116084332.1864967-1-dwmw2@infradead.org> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+cabf69696ff47aa9dee2+7816+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=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: Roger Pau Monne The 'm' parameter used to request auto-allocation of the destination variable is not supported on FreeBSD, and as such leads to failures to parse. What's more, the current usage of '%ms' with xs_node_scanf() is pointless, as it just leads to a double allocation of the same string. Instead use xs_node_read() to read the whole xenstore node. Fixes: a783f8ad4ec9 ('xen: add a mechanism to automatically create XenDevice-s...') Fixes: 9b7737469080 ('hw/xen: update Xen console to XenDevice model') Signed-off-by: Roger Pau Monné Signed-off-by: David Woodhouse Reviewed-by: Anthony PERARD --- hw/block/xen-block.c | 3 ++- hw/char/xen_console.c | 6 ++++-- hw/xen/xen-bus.c | 14 ++++++++++++-- include/hw/xen/xen-bus.h | 1 + 4 files changed, 19 insertions(+), 5 deletions(-) diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c index 306d38927c..034a18b70e 100644 --- a/hw/block/xen-block.c +++ b/hw/block/xen-block.c @@ -239,7 +239,8 @@ static void xen_block_connect(XenDevice *xendev, Error **errp) return; } - if (xen_device_frontend_scanf(xendev, "protocol", "%ms", &str) != 1) { + str = xen_device_frontend_read(xendev, "protocol"); + if (!str) { /* x86 defaults to the 32-bit protocol even for 64-bit guests. */ if (object_dynamic_cast(OBJECT(qdev_get_machine()), "x86-machine")) { protocol = BLKIF_PROTOCOL_X86_32; diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c index ef0c2912ef..cb39b21504 100644 --- a/hw/char/xen_console.c +++ b/hw/char/xen_console.c @@ -550,7 +550,8 @@ static void xen_console_device_create(XenBackendInstance *backend, goto fail; } - if (xs_node_scanf(xsh, XBT_NULL, fe, "type", errp, "%ms", &type) != 1) { + type = xs_node_read(xsh, XBT_NULL, NULL, errp, "%s/%s", fe, "type"); + if (!type) { error_prepend(errp, "failed to read console device type: "); goto fail; } @@ -568,7 +569,8 @@ static void xen_console_device_create(XenBackendInstance *backend, snprintf(label, sizeof(label), "xencons%ld", number); - if (xs_node_scanf(xsh, XBT_NULL, fe, "output", NULL, "%ms", &output) == 1) { + output = xs_node_read(xsh, XBT_NULL, NULL, NULL, "%s/%s", fe, "output"); + if (output) { /* * FIXME: sure we want to support implicit * muxed monitors here? diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c index adfc4efad0..feeb612681 100644 --- a/hw/xen/xen-bus.c +++ b/hw/xen/xen-bus.c @@ -156,8 +156,8 @@ again: !strcmp(key[i], "hotplug-status")) continue; - if (xs_node_scanf(xenbus->xsh, tid, path, key[i], NULL, "%ms", - &val) == 1) { + val = xs_node_read(xenbus->xsh, tid, NULL, NULL, "%s/%s", path, key[i]); + if (val) { qdict_put_str(opts, key[i], val); free(val); } @@ -650,6 +650,16 @@ int xen_device_frontend_scanf(XenDevice *xendev, const char *key, return rc; } +char *xen_device_frontend_read(XenDevice *xendev, const char *key) +{ + XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); + + g_assert(xenbus->xsh); + + return xs_node_read(xenbus->xsh, XBT_NULL, NULL, NULL, "%s/%s", + xendev->frontend_path, key); +} + static void xen_device_frontend_set_state(XenDevice *xendev, enum xenbus_state state, bool publish) diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h index 38d40afa37..2adb2af839 100644 --- a/include/hw/xen/xen-bus.h +++ b/include/hw/xen/xen-bus.h @@ -91,6 +91,7 @@ void xen_device_frontend_printf(XenDevice *xendev, const char *key, int xen_device_frontend_scanf(XenDevice *xendev, const char *key, const char *fmt, ...) G_GNUC_SCANF(3, 4); +char *xen_device_frontend_read(XenDevice *xendev, const char *key); void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs, Error **errp);