[PATCH v3 26/26] qapi/accel: Allow to query mshv capabilities

[Magnus Kulke]

From: Praveen K Paladugu <pra...@microsoft.com>

Allow to query mshv capabilities via query-mshv QMP command.

Signed-off-by: Praveen K Paladugu <pra...@linux.microsoft.com>
Signed-off-by: Magnus Kulke <magnusku...@linux.microsoft.com>
---
 hw/core/machine-qmp-cmds.c | 14 ++++++++++++++
 qapi/accelerator.json      | 29 +++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
index 6aca1a626e..024ddb8d2d 100644
--- a/hw/core/machine-qmp-cmds.c
+++ b/hw/core/machine-qmp-cmds.c
@@ -28,6 +28,20 @@
 #include "system/runstate.h"
 #include "system/system.h"
 #include "hw/s390x/storage-keys.h"
+#include <sys/stat.h>
+
+/*
+ * QMP query for MSHV
+ */
+MshvInfo *qmp_query_mshv(Error **errp)
+{
+    MshvInfo *info = g_malloc0(sizeof(*info));
+    struct stat st;
+
+    info->present = accel_find("mshv");
+    info->enabled = (stat("/dev/mshv", &st) == 0);
+    return info;
+}
 
 /*
  * fast means: we NEVER interrupt vCPU threads to retrieve
diff --git a/qapi/accelerator.json b/qapi/accelerator.json
index fb28c8d920..c2bfbc507f 100644
--- a/qapi/accelerator.json
+++ b/qapi/accelerator.json
@@ -54,3 +54,32 @@
 { 'command': 'x-accel-stats',
   'returns': 'HumanReadableText',
   'features': [ 'unstable' ] }
+
+##
+# @MshvInfo:
+#
+# Information about support for MSHV acceleration
+#
+# @enabled: true if MSHV acceleration is active
+#
+# @present: true if MSHV acceleration is built into this executable
+#
+# Since: 10.0.92
+##
+{ 'struct': 'MshvInfo', 'data': {'enabled': 'bool', 'present': 'bool'} }
+
+##
+# @query-mshv:
+#
+# Return information about MSHV acceleration
+#
+# Returns: @MshvInfo
+#
+# Since: 10.0.92
+#
+# .. qmp-example::
+#
+#     -> { "execute": "query-mshv" }
+#     <- { "return": { "enabled": true, "present": true } }
+##
+{ 'command': 'query-mshv', 'returns': 'MshvInfo' }
-- 
2.34.1