From patchwork Wed Jan 15 16:27:19 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13940644 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 7340BC02185 for ; Wed, 15 Jan 2025 16:37:13 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tY6N0-0007Vq-UK; Wed, 15 Jan 2025 11:35:55 -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 1tY6My-0007TG-9s; Wed, 15 Jan 2025 11:35:52 -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 1tY6Mu-0001e6-OM; Wed, 15 Jan 2025 11:35:52 -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=avIVcNVqQ6j0evk6/rCF7dghJGKxSFwtADzqzgfr/dc=; b=CMCvmvfDcdm9LD61HoKq/cRAPv i6lBUIect+qUzZMx/qDM3KhyWioS+yXn+XWAZxssNT97ml+5q5DZC/AKzXMmJbi+/BlnOfOZivDTj HRfOd4rOdFig6oPCfbzUXV0s3QNqA/ysEzwU/Imm3xaE6/KQlHUFGkL4S6HYGjeS60Tc9F2ms70Z/ 4onciy0CBnQLh5londT61eAMmpkN0ZJaXemMhdglNNsB8MNbqsCH8E1qykMJAfYqBNgnU3KqIzUTN H4RS6tbm6SAKmEPNVN6eayfhLuSoDQptjwvM7gYIhDXN7OeqJoyzPrIayk7FTLz4AI6aR0aJaTqqT mwOiMB6A==; 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 1tY6Mq-0000000GF6G-0R8I; Wed, 15 Jan 2025 16:35:44 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tY6Mp-00000001HhS-3ZNZ; Wed, 15 Jan 2025 16:35:43 +0000 From: David Woodhouse To: qemu-devel@nongnu.org, =?utf-8?q?Roger_Pau_Monn=C3=A9?= 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 Subject: [PATCH v3 1/7] hw/xen: Add xs_node_read() helper function Date: Wed, 15 Jan 2025 16:27:19 +0000 Message-ID: <20250115163542.291424-2-dwmw2@infradead.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250115163542.291424-1-dwmw2@infradead.org> References: <20250115163542.291424-1-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+fb641630334796bb9467+7815+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: David Woodhouse This returns the full contents of the node, having created the node path from the printf-style format string provided in its arguments. This will save various callers from having to do so for themselves (and from using xs_node_scanf() with the non-portable %ms format string. Signed-off-by: David Woodhouse [remove double newline and constify trace parameters] Signed-off-by: Roger Pau Monné Reviewed-by: Anthony PERARD --- hw/xen/trace-events | 1 + hw/xen/xen-bus-helper.c | 22 ++++++++++++++++++++++ include/hw/xen/xen-bus-helper.h | 9 +++++++++ 3 files changed, 32 insertions(+) diff --git a/hw/xen/trace-events b/hw/xen/trace-events index a07fe41c6d..461dee7b23 100644 --- a/hw/xen/trace-events +++ b/hw/xen/trace-events @@ -39,6 +39,7 @@ xs_node_create(const char *node) "%s" xs_node_destroy(const char *node) "%s" xs_node_vprintf(char *path, char *value) "%s %s" xs_node_vscanf(char *path, char *value) "%s %s" +xs_node_read(const char *path, const char *value) "%s %s" xs_node_watch(char *path) "%s" xs_node_unwatch(char *path) "%s" diff --git a/hw/xen/xen-bus-helper.c b/hw/xen/xen-bus-helper.c index b2b2cc9c5d..22fd2f6c1a 100644 --- a/hw/xen/xen-bus-helper.c +++ b/hw/xen/xen-bus-helper.c @@ -142,6 +142,28 @@ int xs_node_scanf(struct qemu_xs_handle *h, xs_transaction_t tid, return rc; } +char *xs_node_read(struct qemu_xs_handle *h, xs_transaction_t tid, + unsigned int *len, Error **errp, + const char *path_fmt, ...) +{ + char *path, *value; + va_list ap; + + va_start(ap, path_fmt); + path = g_strdup_vprintf(path_fmt, ap); + va_end(ap); + + value = qemu_xen_xs_read(h, tid, path, len); + trace_xs_node_read(path, value); + if (!value) { + error_setg_errno(errp, errno, "failed to read from '%s'", path); + } + + g_free(path); + + return value; +} + struct qemu_xs_watch *xs_node_watch(struct qemu_xs_handle *h, const char *node, const char *key, xs_watch_fn fn, void *opaque, Error **errp) diff --git a/include/hw/xen/xen-bus-helper.h b/include/hw/xen/xen-bus-helper.h index d8dcc2f010..e9911115b3 100644 --- a/include/hw/xen/xen-bus-helper.h +++ b/include/hw/xen/xen-bus-helper.h @@ -38,6 +38,15 @@ int xs_node_scanf(struct qemu_xs_handle *h, xs_transaction_t tid, const char *fmt, ...) G_GNUC_SCANF(6, 7); +/* + * Unlike other functions here, the printf-formatted path_fmt is for + * the XenStore path, not the contents of the node. + */ +char *xs_node_read(struct qemu_xs_handle *h, xs_transaction_t tid, + unsigned int *len, Error **errp, + const char *path_fmt, ...) + G_GNUC_PRINTF(5, 6); + /* Watch node/key unless node is empty, in which case watch key */ struct qemu_xs_watch *xs_node_watch(struct qemu_xs_handle *h, const char *node, const char *key, xs_watch_fn fn,