Signed-off-by: Lei Li <li...@linux.vnet.ibm.com>
---
hmp-commands.hx | 22 +++++++++++++++++
hmp.c | 19 +++++++++++++++
hmp.h | 1 +
qapi-schema.json | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-char.c | 46 ++++++++++++++++++++++++++++++++++++
qmp-commands.hx | 40 +++++++++++++++++++++++++++++++
6 files changed, 197 insertions(+), 0 deletions(-)
diff --git a/hmp-commands.hx b/hmp-commands.hx
index e0b537d..753aab3 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -825,6 +825,28 @@ Inject an NMI on the given CPU (x86 only).
ETEXI
{
+ .name = "memchar_write",
+ .args_type = "chardev:s,control:-b,data:s",
+ .params = "chardev [-b] data",
+ .help = "Provide writing interface for CirMemCharDriver. Write"
+ "'data' to it. (Use -b for 'block' option)",
+ .mhandler.cmd = hmp_memchar_write,
+ },
+
+STEXI
+@item memchar_write @var{chardev} [-b] @var{data}
+@findex memchar_write
+Provide writing interface for CirMemCharDriver. Write @var{data}
+to cirmemchr char device. The size of the data write to the driver
+should better be power of 2.
+
+@var{control} is option('block', 'drop') for read and write command
+that specifies behavior when the queue is full/empty. By default is
+'drop'. Note that the 'block' option is not supported now.
+ -b for 'block' option. None for 'drop' option.
+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 70bdec2..18ca61b 100644
--- a/hmp.c
+++ b/hmp.c
@@ -671,6 +671,25 @@ void hmp_pmemsave(Monitor *mon, const QDict *qdict)
hmp_handle_error(mon, &errp);
}
+void hmp_memchar_write(Monitor *mon, const QDict *qdict)
+{
+ uint32_t size;
+ const char *chardev = qdict_get_str(qdict, "chardev");
+ const char *data = qdict_get_str(qdict, "data");
+ enum DataFormat format;
+ int con = qdict_get_try_bool(qdict, "block", 0);
+ enum CongestionControl control;
+ Error *errp = NULL;
+
+ size = strlen(data);
+ format = DATA_FORMAT_UTF8;
+ control = con ? CONGESTION_CONTROL_BLOCK : CONGESTION_CONTROL_DROP;
+ qmp_memchar_write(chardev, size, data, true, format,
+ true, control, &errp);
+
+ hmp_handle_error(mon, &errp);
+}
+
static void hmp_cont_cb(void *opaque, int err)
{
if (!err) {
diff --git a/hmp.h b/hmp.h
index 71ea384..406ebb1 100644
--- a/hmp.h
+++ b/hmp.h
@@ -43,6 +43,7 @@ void hmp_system_powerdown(Monitor *mon, const QDict *qdict);
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_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 f9dbdae..a908aa6 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -325,6 +325,75 @@
{ 'command': 'query-chardev', 'returns': ['ChardevInfo'] }
##
+# @DataFormat:
+#
+# An enumeration of data format write to or read from
+# memchardev. The default value would be utf8.
+#
+# @utf8: The data format is 'utf8'.
+#
+# @base64: The data format is 'base64'.
+#
+# Note: The data format start with 'utf8' and 'base64', will support
+# other data format as well.
+#
+# Since: 1.3
+##
+{ 'enum': 'DataFormat'
+ 'data': [ 'utf8', 'base64' ] }
+
+##
+# @CongestionControl
+#
+# An enumeration of options for the read and write command that
+# specifies behavior when the queue is full/empty. The default
+# option would be drop.
+#
+# @drop: Would result in reads returning empty strings and writes
+# dropping queued data.
+#
+# @block: Would make the session block until data was available
+# or the queue had space available.
+#
+# Note: The option 'block' is not supported now due to the miss
+# feature in qmp. Will add it later when we gain the necessary
+# infrastructure enhancement.
+#
+# Since: 1.3
+##
+{'enum': 'CongestionControl'
+ 'data': [ 'drop', 'block' ] }
+
+##
+# @memchar-write:
+#
+# Provide writing interface for memchardev. Write data to memchar
+# char device.
+#
+# @chardev: the name of the memchar char device.
+#
+# @size: the size to write in bytes. Should be power of 2.
+#
+# @data: the source data write to memchar.
+#
+# @format: #optional the format of the data write to memchardev, by
+# default is 'utf8'.
+#
+# @control: #optional options for read and write command that specifies
+# behavior when the queue is full/empty.
+#
+# Returns: Nothing on success
+# If @chardev is not a valid memchr device, DeviceNotFound
+# If an I/O error occurs while writing, IOError
+#
+# Since: 1.3
+##
+{ 'command': 'memchar-write',
+ 'data': {'chardev': 'str', 'size': 'int', 'data': 'str',
+ '*format': 'DataFormat',
+ '*control': 'CongestionControl'} }
+
+##
# @CommandInfo:
#
# Information about a QMP command
diff --git a/qemu-char.c b/qemu-char.c
index 381bf60..133d282 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2690,6 +2690,52 @@ static CharDriverState *qemu_chr_open_cirmemchr(QemuOpts
*opts)
return chr;
}
+void qmp_memchar_write(const char *chardev, int64_t size,
+ const char *data, bool has_format,
+ enum DataFormat format, bool has_control,
+ enum CongestionControl control,
+ Error **errp)
+{
+ CharDriverState *chr;
+ guchar *write_data;
+ int ret;
+ gsize write_count;
+
+ chr = qemu_chr_find(chardev);
+
+ if (!chr) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, chardev);
+ return;
+ }
+
+ /* XXX: For the sync command as 'block', waiting for the qmp
+ * * to support necessary feature. Now just act as 'drop'. */
+ if (cirmem_chr_is_full(chr)) {
+ if (has_control && (control == CONGESTION_CONTROL_BLOCK)) {
+ error_setg(errp, "Failed to write to memchr %s", chardev);
+ return;
+ } else {
+ error_setg(errp, "Failed to write to memchr %s", chardev);
+ return;
+ }
+ }
+
+ write_count = (gsize)size;
+
+ if (has_format && (format == DATA_FORMAT_BASE64)) {
+ write_data = g_base64_decode(data, &write_count);
+ } else {
+ write_data = (uint8_t *)data;
+ }
+
+ ret = cirmem_chr_write(chr, write_data, write_count);
+
+ if (ret < 0) {
+ error_setg(errp, "Failed to write to memchr %s", chardev);
+ return;
+ }
+}
+
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 2f8477e..502ed57 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -466,6 +466,46 @@ Note: inject-nmi fails when the guest doesn't support
injecting.
EQMP
{
+ .name = "memchar-write",
+ .args_type = "chardev:s,size:i,data:s,format:s?,control:s?",
+ .help = "write size of data to memchar chardev",
+ .mhandler.cmd_new = qmp_marshal_input_memchar_write,
+ },
+
+SQMP
+memchar-write
+-------------
+
+Provide writing interface for memchardev. Write data to memchar
+char device.
+
+Arguments:
+
+- "chardev": the name of the char device, must be unique (json-string)
+- "size": the memory size, in bytes, should be power of 2 (json-int)
+- "data": the source data writed to memchar (json-string)
+- "format": the data format write to memchardev, default is
+ utf8. (json-string, optional)
+ - Possible values: "utf8", "base64"
+
+- "control": options for read and write command that specifies
+ behavior when the queue is full/empty, default is
+ drop. (json-string, optional)
+ - Possible values: "drop", "block"
+
+Example:
+
+-> { "execute": "memchar-write",
+ "arguments": { "chardev": foo,
+ "size": 8,
+ "data": "abcdefgh",
+ "format": "utf8",
+ "control": "drop" } }
+<- { "return": {} }
+
+EQMP
+
+ {
.name = "xen-save-devices-state",
.args_type = "filename:F",
.mhandler.cmd_new = qmp_marshal_input_xen_save_devices_state,
--
1.7.7.6
