[Qemu-devel] [PATCH RFC for-2.3 1/6] qga: introduce three guest memory block commands with stubs

[zhanghailiang <zhang.zhanghailiang@huawei.com>]

Introduce three new guest commands:
guest-get-memory-blocks, guest-set-memory-blocks, guest-get-memory-block-size.

With these three commands, we can support online/offline guest's memory block
(logical memory hotplug/unplug) as required from host.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
---
 qga/commands-posix.c | 19 ++++++++++++
 qga/commands-win32.c | 19 ++++++++++++
 qga/qapi-schema.json | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 126 insertions(+)

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index f6f3e3c..b0d6a5d 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1996,6 +1996,25 @@ GList *ga_command_blacklist_init(GList *blacklist)
     return blacklist;
 }
 
+GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
+{
+    error_set(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+int64_t qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks,
+                                    Error **errp)
+{
+    error_set(errp, QERR_UNSUPPORTED);
+    return -1;
+}
+
+int64_t qmp_guest_get_memory_block_size(Error **errp)
+{
+    error_set(errp, QERR_UNSUPPORTED);
+    return -1;
+}
+
 /* register init/cleanup routines for stateful command groups */
 void ga_command_state_init(GAState *s, GACommandState *cs)
 {
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 3bcbeae..b53b679 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -446,6 +446,25 @@ int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
     return -1;
 }
 
+GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
+{
+    error_set(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+int64_t qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks,
+                                    Error **errp)
+{
+    error_set(errp, QERR_UNSUPPORTED);
+    return -1;
+}
+
+int64_t qmp_guest_get_memory_block_size(Error **errp)
+{
+    error_set(errp, QERR_UNSUPPORTED);
+    return -1;
+}
+
 /* add unsupported commands to the blacklist */
 GList *ga_command_blacklist_init(GList *blacklist)
 {
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 376e79f..4b81769 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -738,3 +738,91 @@
 ##
 { 'command': 'guest-get-fsinfo',
   'returns': ['GuestFilesystemInfo'] }
+
+##
+# @GuestMemoryBlock:
+#
+# @phys_index: Arbitrary guest-specific unique identifier of the MEMORY BLOCK.
+#
+# @online: Whether the MEMORY BLOCK is enabled in logically.
+#
+# @can-offline: #optional Whether offlining the MEMORY BLOCK  is possible. This member
+#               is always filled in by the guest agent when the structure is
+#               returned, and always ignored on input (hence it can be omitted
+#               then).
+#
+# Since: 2.3
+##
+{ 'type': 'GuestMemoryBlock',
+  'data': {'phys_index': 'uint64',
+           'online': 'bool',
+           '*can-offline': 'bool'} }
+
+##
+# @guest-get-memory-blocks:
+#
+# Retrieve the list of the guest's memory blocks.
+#
+# This is a read-only operation.
+#
+# Returns: The list of all memory blocks the guest knows about.
+# Each memory block is put on the list exactly once, but their order
+# is unspecified.
+#
+# Since: 2.3
+##
+{ 'command': 'guest-get-memory-blocks',
+  'returns': ['GuestMemoryBlock'] }
+
+##
+# @guest-set-memory-blocks:
+#
+# Attempt to reconfigure (currently: enable/disable) state of memory blocks
+# inside the guest.
+#
+# The input list is processed node by node in order. In each node @phys_index
+# is used to look up the guest MEMORY BLOCK, for which @online specifies the requested
+# state. The set of distinct @phys_index's is only required to be a subset of
+# the guest-supported identifiers. There's no restriction on list length or on
+# repeating the same @phys_index (with possibly different @online field).
+# Preferably the input list should describe a modified subset of
+# @guest-get-memory-blocks' return value.
+#
+# Returns: The length of the initial sublist that has been successfully
+#          processed. The guest agent maximizes this value. Possible cases:
+#
+#          0:                if the @mem-blks list was empty on input. Guest state
+#                            has not been changed. Otherwise,
+#
+#          Error:            processing the first node of @mem-blks failed for the
+#                            reason returned. Guest state has not been changed.
+#                            Otherwise,
+#
+#          < length(@mem-blks): more than zero initial nodes have been processed,
+#                            but not the entire @mem-blks list. Guest state has
+#                            changed accordingly. To retrieve the error
+#                            (assuming it persists), repeat the call with the
+#                            successfully processed initial sublist removed.
+#                            Otherwise,
+#
+#          length(@mem-blks):   call successful.
+#
+# Since: 2.3
+##
+{ 'command': 'guest-set-memory-blocks',
+  'data':    {'mem-blks': ['GuestMemoryBlock'] },
+  'returns': 'int' }
+
+##
+# @guest-get-memory-block-size:
+#
+# Get the the size (in bytes) of a memory block in guest.
+# It is the unit of Memory online/offline operation (also called Logical Memory Hotplug).
+#
+# Returns: memory block size in bytes.
+#
+# Since 2.3
+##
+{ 'command': 'guest-get-memory-block-size',
+  'returns': 'int' }
+
-- 
1.7.12.4