qapi/accel: Allow to query mshv capabilities

Allow to query mshv capabilities via query-mshv QMP and info mshv HMP commands.

Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
Acked-by: Dr. David Alan Gilbert <dave@treblig.org>
Link: https://lore.kernel.org/r/20250916164847.77883-25-magnuskulke@linux.microsoft.com
[Fix "since" version. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hmp-commands-info.hx

@@ -307,6 +307,19 @@ SRST
     Show KVM information.
 ERST
 
+    {
+        .name       = "mshv",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show MSHV information",
+        .cmd        = hmp_info_mshv,
+    },
+
+SRST
+  ``info mshv``
+    Show MSHV information.
+ERST
+
     {
         .name       = "numa",
         .args_type  = "",

hw/core/machine-hmp-cmds.c

@@ -163,6 +163,21 @@ void hmp_info_kvm(Monitor *mon, const QDict *qdict)
     qapi_free_KvmInfo(info);
 }
 
+void hmp_info_mshv(Monitor *mon, const QDict *qdict)
+{
+    MshvInfo *info;
+
+    info = qmp_query_mshv(NULL);
+    monitor_printf(mon, "mshv support: ");
+    if (info->present) {
+        monitor_printf(mon, "%s\n", info->enabled ? "enabled" : "disabled");
+    } else {
+        monitor_printf(mon, "not compiled\n");
+    }
+
+    qapi_free_MshvInfo(info);
+}
+
 void hmp_info_uuid(Monitor *mon, const QDict *qdict)
 {
     UuidInfo *info;

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));
+
+    info->enabled = mshv_enabled();
+    info->present = accel_find("mshv");
+
+    return info;
+}
 
 /*
  * fast means: we NEVER interrupt vCPU threads to retrieve

include/monitor/hmp.h

@@ -24,6 +24,7 @@ strList *hmp_split_at_comma(const char *str);
 void hmp_info_name(Monitor *mon, const QDict *qdict);
 void hmp_info_version(Monitor *mon, const QDict *qdict);
 void hmp_info_kvm(Monitor *mon, const QDict *qdict);
+void hmp_info_mshv(Monitor *mon, const QDict *qdict);
 void hmp_info_status(Monitor *mon, const QDict *qdict);
 void hmp_info_uuid(Monitor *mon, const QDict *qdict);
 void hmp_info_chardev(Monitor *mon, const QDict *qdict);

include/system/hw_accel.h

@@ -14,6 +14,7 @@
 #include "hw/core/cpu.h"
 #include "system/kvm.h"
 #include "system/hvf.h"
+#include "system/mshv.h"
 #include "system/whpx.h"
 #include "system/nvmm.h"
 

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: 10.2.0
+##
+{ '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' }