From patchwork Tue Jan 22 08:12:52 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lei Li X-Patchwork-Id: 214461 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 419EE2C2750 for ; Tue, 22 Jan 2013 19:13:58 +1100 (EST) Received: from localhost ([::1]:49839 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TxYzU-00039Q-Ak for incoming@patchwork.ozlabs.org; Tue, 22 Jan 2013 03:13:56 -0500 Received: from eggs.gnu.org ([208.118.235.92]:60645) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TxYz9-000320-KV for qemu-devel@nongnu.org; Tue, 22 Jan 2013 03:13:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TxYz7-0002Fu-8C for qemu-devel@nongnu.org; Tue, 22 Jan 2013 03:13:35 -0500 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:39025) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TxYz6-0002Eg-8n for qemu-devel@nongnu.org; Tue, 22 Jan 2013 03:13:33 -0500 Received: from /spool/local by e28smtp05.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 22 Jan 2013 13:42:12 +0530 Received: from d28dlp03.in.ibm.com (9.184.220.128) by e28smtp05.in.ibm.com (192.168.1.135) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Tue, 22 Jan 2013 13:42:10 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id 13A09125804E for ; Tue, 22 Jan 2013 13:43:51 +0530 (IST) Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r0M8DP6P48955460 for ; Tue, 22 Jan 2013 13:43:25 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r0M8DQaH021021 for ; Tue, 22 Jan 2013 19:13:26 +1100 Received: from localhost.localdomain ([9.125.26.121]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r0M8CxIW019254; Tue, 22 Jan 2013 19:13:25 +1100 From: Lei Li To: qemu-devel@nongnu.org Date: Tue, 22 Jan 2013 16:12:52 +0800 Message-Id: <1358842372-16344-4-git-send-email-lilei@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <1358842372-16344-1-git-send-email-lilei@linux.vnet.ibm.com> References: <1358842372-16344-1-git-send-email-lilei@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13012208-8256-0000-0000-000005EE6E4E X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 122.248.162.5 Cc: aliguori@us.ibm.com, Lei Li Subject: [Qemu-devel] [PATCH 3/3] QAPI: Introduce memchar-read QMP command X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Lei Li --- hmp-commands.hx | 19 ++++++++++++++++++ hmp.c | 17 ++++++++++++++++ hmp.h | 1 + qapi-schema.json | 25 +++++++++++++++++++++++ qemu-char.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ qmp-commands.hx | 34 ++++++++++++++++++++++++++++++++ 6 files changed, 153 insertions(+), 0 deletions(-) diff --git a/hmp-commands.hx b/hmp-commands.hx index e546c76..52ead10 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -856,6 +856,25 @@ to char device 'memory'. ETEXI { + .name = "memchar_read", + .args_type = "chardev:s,size:i", + .params = "chardev size", + .mhandler.cmd = hmp_memchar_read, + }, + +STEXI +@item memchar_read @var{chardev} +@findex memchar_read +Provide read interface for CirMemCharDriver. Read from char device +'memory' and return @var{size} of the data. + +@var{size} is the size of data want to read from. Refer to unencoded +size of the raw data, would adjust to the init size of the memchar +if the requested size is larger than it. + +ETEXI + + { .name = "migrate", .args_type = "detach:-d,blk:-b,inc:-i,uri:s", .params = "[-d] [-b] [-i] uri", diff --git a/hmp.c b/hmp.c index 546d687..7e86c24 100644 --- a/hmp.c +++ b/hmp.c @@ -697,6 +697,23 @@ void hmp_memchar_write(Monitor *mon, const QDict *qdict) hmp_handle_error(mon, &errp); } +void hmp_memchar_read(Monitor *mon, const QDict *qdict) +{ + uint32_t size = qdict_get_int(qdict, "size"); + const char *chardev = qdict_get_str(qdict, "chardev"); + char *data; + Error *errp = NULL; + + data = qmp_memchar_read(chardev, size, false, 0, &errp); + if (errp) { + monitor_printf(mon, "%s\n", error_get_pretty(errp)); + error_free(errp); + return; + } + + monitor_printf(mon, "%s\n", data); +} + static void hmp_cont_cb(void *opaque, int err) { if (!err) { diff --git a/hmp.h b/hmp.h index 06d6ea2..076d8cf 100644 --- a/hmp.h +++ b/hmp.h @@ -44,6 +44,7 @@ void hmp_cpu(Monitor *mon, const QDict *qdict); void hmp_memsave(Monitor *mon, const QDict *qdict); void hmp_pmemsave(Monitor *mon, const QDict *qdict); void hmp_memchar_write(Monitor *mon, const QDict *qdict); +void hmp_memchar_read(Monitor *mon, const QDict *qdict); void hmp_cont(Monitor *mon, const QDict *qdict); void hmp_system_wakeup(Monitor *mon, const QDict *qdict); void hmp_inject_nmi(Monitor *mon, const QDict *qdict); diff --git a/qapi-schema.json b/qapi-schema.json index c34e9ac..56d4b39 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -366,6 +366,31 @@ '*format': 'DataFormat'} } ## +# @memchar-read: +# +# Provide read interface for memchardev. Read from the char +# device 'memory' and return the data. +# +# @chardev: the name of the memory char device. +# +# @size: the size to read in bytes. +# +# @format: #optional the format of the data want to read from +# memchardev, by default is 'utf8'. +# +# Returns: The data read from memchar as string +# If @chardev is not a valid memchr device, DeviceNotFound +# +# Notes: For now assume 'drop' behaver, which would result in reads +# returning empty strings. +# +# Since: 1.4 +## +{ 'command': 'memchar-read', + 'data': {'chardev': 'str', 'size': 'int', '*format': 'DataFormat'}, + 'returns': 'str' } + +## # @CommandInfo: # # Information about a QMP command diff --git a/qemu-char.c b/qemu-char.c index c3bb6ec..a1fb543 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -2802,6 +2802,63 @@ void qmp_memchar_write(const char *chardev, int64_t size, } } +char *qmp_memchar_read(const char *chardev, int64_t size, + bool has_format, enum DataFormat format, + Error **errp) +{ + CharDriverState *chr; + guchar *read_data; + char *data = NULL; + int ret; + size_t count; + + chr = qemu_chr_find(chardev); + if (!chr) { + error_set(errp, QERR_DEVICE_NOT_FOUND, chardev); + return NULL; + } + + if (qemu_is_chr(chr, "memory")) { + error_setg(errp,"%s is not memory char device\n", chardev); + return NULL; + } + + if (size <= 0) { + error_setg(errp, "Failed to read from device %s", chardev); + return NULL; + } + + /* XXX: Return the empty strings when the buffer is empty. */ + if (cirmem_chr_is_empty(chr)) { + error_setg(errp, "Memory device %s is empty", chardev); + return NULL; + } + + count = qemu_chr_cirmem_count(chr); + size = size > count ? count : size; + read_data = g_malloc0(size + 1); + + ret = cirmem_chr_read(chr, read_data, size); + if (ret < size) { + error_setg(errp, "Failed to read from device %s", chardev); + goto fail; + } + + if (has_format && (format == DATA_FORMAT_BASE64)) { + if (read_data) { + data = g_base64_encode(read_data, (size_t)size); + } + } else { + data = (char *)read_data; + } + + return data; + +fail: + g_free(read_data); + return NULL; +} + QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename) { char host[65], port[33], width[8], height[8]; diff --git a/qmp-commands.hx b/qmp-commands.hx index 8ad06d0..53a8f4d 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -500,6 +500,40 @@ Example: EQMP { + .name = "memchar-read", + .args_type = "chardev:s,size:i,format:s?", + .help = "return the size of data from memchar chardev", + .mhandler.cmd_new = qmp_marshal_input_memchar_read, + }, + +SQMP +memchar-read +------------- + +Provide read interface for CirMemCharDriver. Read from the char +device memory and return the data. + +Arguments: + +- "chardev": the name of the char device, must be unique (json-string) +- "size": the memory size wanted to read in bytes (refer to unencoded + size of the raw data), would adjust to the init size of the + memchar if the requested size is larger than it. (json-int) +- "format": the data format write to memchardev, default is + utf8. (json-string, optional) + - Possible values: "utf8", "base64" + +Example: + +-> { "execute": "memchar-read", + "arguments": { "chardev": foo, + "size": 1000, + "format": "utf8" } } +<- { "return": "data string..." } + +EQMP + + { .name = "xen-save-devices-state", .args_type = "filename:F", .mhandler.cmd_new = qmp_marshal_input_xen_save_devices_state,