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From 1b2628fe2375d602a6f123a0aa4a5cd190e72d3e Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Fri, 7 Nov 2014 17:18:05 +0100
Subject: [PATCH 18/41] dump: add 'query-dump-guest-memory-capability' command

Message-id: <1415380693-16593-19-git-send-email-lersek@redhat.com>
Patchwork-id: 62204
O-Subject: [RHEL-7.1 qemu-kvm PATCH 18/26] dump: add 'query-dump-guest-memory-capability' command
Bugzilla: 1157798
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
RH-Acked-by: dgibson <dgibson@redhat.com>

From: qiaonuohan <qiaonuohan@cn.fujitsu.com>

'query-dump-guest-memory-capability' is used to query the available formats for
'dump-guest-memory'. The output of the command will be like:

-> { "execute": "query-dump-guest-memory-capability" }
<- { "return": { "formats":
                    ["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }

Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
(cherry picked from commit 7d6dc7f30c4781857ce230333da6ddd21fe0dcde)
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 dump.c           | 33 +++++++++++++++++++++++++++++++++
 qapi-schema.json | 24 ++++++++++++++++++++++++
 qmp-commands.hx  | 20 ++++++++++++++++++++
 3 files changed, 77 insertions(+)

diff --git a/dump.c b/dump.c
index 507a250..25bf8e6 100644
--- a/dump.c
+++ b/dump.c
@@ -1797,3 +1797,36 @@ void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin,
 
     g_free(s);
 }
+
+DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
+{
+    DumpGuestMemoryFormatList *item;
+    DumpGuestMemoryCapability *cap =
+                                  g_malloc0(sizeof(DumpGuestMemoryCapability));
+
+    /* elf is always available */
+    item = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+    cap->formats = item;
+    item->value = DUMP_GUEST_MEMORY_FORMAT_ELF;
+
+    /* kdump-zlib is always available */
+    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+    item = item->next;
+    item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB;
+
+    /* add new item if kdump-lzo is available */
+#ifdef CONFIG_LZO
+    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+    item = item->next;
+    item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO;
+#endif
+
+    /* add new item if kdump-snappy is available */
+#ifdef CONFIG_SNAPPY
+    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
+    item = item->next;
+    item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
+#endif
+
+    return cap;
+}
diff --git a/qapi-schema.json b/qapi-schema.json
index 8f81c76..31ac5c5 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2645,6 +2645,30 @@
             '*length': 'int', '*format': 'DumpGuestMemoryFormat' } }
 
 ##
+# @DumpGuestMemoryCapability:
+#
+# A list of the available formats for dump-guest-memory
+#
+# Since: 2.0
+##
+{ 'type': 'DumpGuestMemoryCapability',
+  'data': {
+      'formats': ['DumpGuestMemoryFormat'] } }
+
+##
+# @query-dump-guest-memory-capability:
+#
+# Returns the available formats for dump-guest-memory
+#
+# Returns:  A @DumpGuestMemoryCapability object listing available formats for
+#           dump-guest-memory
+#
+# Since: 2.0
+##
+{ 'command': 'query-dump-guest-memory-capability',
+  'returns': 'DumpGuestMemoryCapability' }
+
+##
 # @netdev_add:
 #
 # Add a network backend.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 61aa3bf..9c11213 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -923,6 +923,26 @@ Notes:
 EQMP
 
     {
+        .name       = "query-dump-guest-memory-capability",
+        .args_type  = "",
+    .mhandler.cmd_new = qmp_marshal_input_query_dump_guest_memory_capability,
+    },
+
+SQMP
+query-dump-guest-memory-capability
+----------
+
+Show available formats for 'dump-guest-memory'
+
+Example:
+
+-> { "execute": "query-dump-guest-memory-capability" }
+<- { "return": { "formats":
+                    ["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }
+
+EQMP
+
+    {
         .name       = "netdev_add",
         .args_type  = "netdev:O",
         .mhandler.cmd_new = qmp_netdev_add,
-- 
1.8.3.1