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[Qemu-devel] [PULL 21/24] block: Initial implementation of -blockdev
From: |
Markus Armbruster |
Subject: |
[Qemu-devel] [PULL 21/24] block: Initial implementation of -blockdev |
Date: |
Tue, 28 Feb 2017 23:26:12 +0100 |
The new command line option -blockdev works like QMP command
blockdev-add.
The option argument may be given in JSON syntax, exactly as in QMP.
Example usage:
-blockdev '{"node-name": "foo", "driver": "raw", "file": {"driver": "file",
"filename": "foo.img"} }'
The JSON argument doesn't exactly blend into the existing option
syntax, so the traditional KEY=VALUE,... syntax is also supported,
using dotted keys to do the nesting:
-blockdev node-name=foo,driver=raw,file.driver=file,file.filename=foo.img
This does not yet support lists or downstream extensions, i.e. keys
with __RFQDN_ prefix, but the next few patches will take care of that.
Note that calling qmp_blockdev_add() (say via qmp_marshal_block_add())
right away would crash. We need to stash the configuration for later
instead. This is crudely done, and bypasses QemuOpts, even though
storing configuration is what QemuOpts is for. Need to revamp option
infrastructure to support QAPI types like BlockdevOptions.
Signed-off-by: Markus Armbruster <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Markus Armbruster <address@hidden>
Message-Id: <address@hidden>
---
qemu-options.hx | 7 +++++++
vl.c | 39 +++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/qemu-options.hx b/qemu-options.hx
index c85f77d..f5202c9 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -532,6 +532,13 @@ Use @var{file} as CD-ROM image (you cannot use
@option{-hdc} and
using @file{/dev/cdrom} as filename (@pxref{host_drives}).
ETEXI
+DEF("blockdev", HAS_ARG, QEMU_OPTION_blockdev,
+ "-blockdev [driver=]driver[,node-name=N][,discard=ignore|unmap]\n"
+ " [,cache.direct=on|off][,cache.no-flush=on|off]\n"
+ " [,read-only=on|off][,detect-zeroes=on|off|unmap]\n"
+ " [,driver specific parameters...]\n"
+ " configure a block backend\n", QEMU_ARCH_ALL)
+
DEF("drive", HAS_ARG, QEMU_OPTION_drive,
"-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n"
" [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]\n"
diff --git a/vl.c b/vl.c
index c6020b9..68405c6 100644
--- a/vl.c
+++ b/vl.c
@@ -95,6 +95,9 @@ int main(int argc, char **argv)
#include "migration/colo.h"
#include "sysemu/kvm.h"
#include "sysemu/hax.h"
+#include "qapi/qobject-input-visitor.h"
+#include "qapi/qobject-input-visitor.h"
+#include "qapi-visit.h"
#include "qapi/qmp/qjson.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
@@ -2975,6 +2978,13 @@ int main(int argc, char **argv, char **envp)
Error *main_loop_err = NULL;
Error *err = NULL;
bool list_data_dirs = false;
+ typedef struct BlockdevOptions_queue {
+ BlockdevOptions *bdo;
+ Location loc;
+ QSIMPLEQ_ENTRY(BlockdevOptions_queue) entry;
+ } BlockdevOptions_queue;
+ QSIMPLEQ_HEAD(, BlockdevOptions_queue) bdo_queue
+ = QSIMPLEQ_HEAD_INITIALIZER(bdo_queue);
module_call_init(MODULE_INIT_TRACE);
@@ -3117,6 +3127,25 @@ int main(int argc, char **argv, char **envp)
drive_add(IF_DEFAULT, popt->index - QEMU_OPTION_hda, optarg,
HD_OPTS);
break;
+ case QEMU_OPTION_blockdev:
+ {
+ Visitor *v;
+ BlockdevOptions_queue *bdo;
+
+ v = qobject_input_visitor_new_str(optarg, "driver", &err);
+ if (!v) {
+ error_report_err(err);
+ exit(1);
+ }
+
+ bdo = g_new(BlockdevOptions_queue, 1);
+ visit_type_BlockdevOptions(v, NULL, &bdo->bdo,
+ &error_fatal);
+ visit_free(v);
+ loc_save(&bdo->loc);
+ QSIMPLEQ_INSERT_TAIL(&bdo_queue, bdo, entry);
+ break;
+ }
case QEMU_OPTION_drive:
if (drive_def(optarg) == NULL) {
exit(1);
@@ -4450,6 +4479,16 @@ int main(int argc, char **argv, char **envp)
}
/* open the virtual block devices */
+ while (!QSIMPLEQ_EMPTY(&bdo_queue)) {
+ BlockdevOptions_queue *bdo = QSIMPLEQ_FIRST(&bdo_queue);
+
+ QSIMPLEQ_REMOVE_HEAD(&bdo_queue, entry);
+ loc_push_restore(&bdo->loc);
+ qmp_blockdev_add(bdo->bdo, &error_fatal);
+ loc_pop(&bdo->loc);
+ qapi_free_BlockdevOptions(bdo->bdo);
+ g_free(bdo);
+ }
if (snapshot || replay_mode != REPLAY_MODE_NONE) {
qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot,
NULL, NULL);
--
2.7.4
- [Qemu-devel] [PULL 04/24] qapi: qobject input visitor variant for use with keyval_parse(), (continued)
- [Qemu-devel] [PULL 04/24] qapi: qobject input visitor variant for use with keyval_parse(), Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 22/24] qapi: Improve how keyval input visitor reports unexpected dicts, Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 12/24] qobject: Propagate parse errors through qobject_from_json(), Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 17/24] test-qapi-util: New, covering qapi/qapi-util.c, Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 23/24] docs/qapi-code-gen.txt: Clarify naming rules, Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 05/24] test-keyval: Cover use with qobject input visitor, Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 18/24] qapi: New parse_qapi_name(), Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 24/24] keyval: Support lists, Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 13/24] block: More detailed syntax error reporting for JSON filenames, Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 14/24] check-qjson: Test errors from qobject_from_json(), Markus Armbruster, 2017/02/28
- [Qemu-devel] [PULL 21/24] block: Initial implementation of -blockdev,
Markus Armbruster <=