[Qemu-devel] [PATCH 1/2] qapi: support device id for x-block-latency-histogram-set

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Support modern way of device selecting.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 qapi/block-core.json | 6 ++++--
 blockdev.c           | 8 +++++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index ac3b48ee54..4efd60d8ab 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -489,7 +489,9 @@
 # If only @device parameter is specified, remove all present latency histograms
 # for the device. Otherwise, add/reset some of (or all) latency histograms.
 #
-# @device: device name to set latency histogram for.
+# @device: device name to set latency histogram for (better use @id).
+#
+# @id: The name or QOM path of the guest device.
 #
 # @boundaries: list of interval boundary values (see description in
 #              BlockLatencyHistogramInfo definition). If specified, all
@@ -547,7 +549,7 @@
 # <- { "return": {} }
 ##
 { 'command': 'x-block-latency-histogram-set',
-  'data': {'device': 'str',
+  'data': {'*device': 'str', '*id': 'str',
            '*boundaries': ['uint64'],
            '*boundaries-read': ['uint64'],
            '*boundaries-write': ['uint64'],
diff --git a/blockdev.c b/blockdev.c
index a8755bd908..87f4ab3316 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -4368,20 +4368,22 @@ void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
 }
 
 void qmp_x_block_latency_histogram_set(
-    const char *device,
+    bool has_device, const char *device,
+    bool has_id, const char *id,
     bool has_boundaries, uint64List *boundaries,
     bool has_boundaries_read, uint64List *boundaries_read,
     bool has_boundaries_write, uint64List *boundaries_write,
     bool has_boundaries_flush, uint64List *boundaries_flush,
     Error **errp)
 {
-    BlockBackend *blk = blk_by_name(device);
+    BlockBackend *blk;
     BlockAcctStats *stats;
 
+    blk = qmp_get_blk(has_device ? device : NULL, has_id ? id : NULL, errp);
     if (!blk) {
-        error_setg(errp, "Device '%s' not found", device);
         return;
     }
+
     stats = blk_get_stats(blk);
 
     if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
-- 
2.18.0