qapi/qom: Add ObjectOptions for memory-backend-*

This adds a QAPI schema for the properties of the memory-backend-*
objects.

HostMemPolicy has to be moved to an include file that can be used by the
storage daemon, too, because ObjectOptions must be the same in all
binaries if we don't want to compile the whole code multiple times.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

3 files changed, 142 insertions, 22 deletions

diff --git a/qapi/common.json b/qapi/common.json
index 716712d4b3..2dad4fadc3 100644
--- a/qapi/common.json
+++ b/qapi/common.json
@@ -145,3 +145,23 @@
 ##
 { 'enum': 'PCIELinkWidth',
   'data': [ '1', '2', '4', '8', '12', '16', '32' ] }
+
+##
+# @HostMemPolicy:
+#
+# Host memory policy types
+#
+# @default: restore default policy, remove any nondefault policy
+#
+# @preferred: set the preferred host nodes for allocation
+#
+# @bind: a strict policy that restricts memory allocation to the
+#        host nodes specified
+#
+# @interleave: memory allocations are interleaved across the set
+#              of host nodes specified
+#
+# Since: 2.1
+##
+{ 'enum': 'HostMemPolicy',
+  'data': [ 'default', 'preferred', 'bind', 'interleave' ] }
diff --git a/qapi/machine.json b/qapi/machine.json
index c0c52aef10..6e90d463fc 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -8,6 +8,8 @@
 # = Machines
 ##
 
+{ 'include': 'common.json' }
+
 ##
 # @SysEmuTarget:
 #
@@ -719,26 +721,6 @@
    'line': 'uint16' }}
 
 ##
-# @HostMemPolicy:
-#
-# Host memory policy types
-#
-# @default: restore default policy, remove any nondefault policy
-#
-# @preferred: set the preferred host nodes for allocation
-#
-# @bind: a strict policy that restricts memory allocation to the
-#        host nodes specified
-#
-# @interleave: memory allocations are interleaved across the set
-#              of host nodes specified
-#
-# Since: 2.1
-##
-{ 'enum': 'HostMemPolicy',
-  'data': [ 'default', 'preferred', 'bind', 'interleave' ] }
-
-##
 # @memsave:
 #
 # Save a portion of guest memory to a file.
diff --git a/qapi/qom.json b/qapi/qom.json
index 6f0ffd4e2f..79525f64a1 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -5,6 +5,7 @@
 # See the COPYING file in the top-level directory.
 
 { 'include': 'authz.json' }
+{ 'include': 'common.json' }
 
 ##
 # = QEMU Object Model (QOM)
@@ -273,6 +274,115 @@
             '*poll-shrink': 'int' } }
 
 ##
+# @MemoryBackendProperties:
+#
+# Properties for objects of classes derived from memory-backend.
+#
+# @merge: if true, mark the memory as mergeable (default depends on the machine
+#         type)
+#
+# @dump: if true, include the memory in core dumps (default depends on the
+#        machine type)
+#
+# @host-nodes: the list of NUMA host nodes to bind the memory to
+#
+# @policy: the NUMA policy (default: 'default')
+#
+# @prealloc: if true, preallocate memory (default: false)
+#
+# @prealloc-threads: number of CPU threads to use for prealloc (default: 1)
+#
+# @share: if false, the memory is private to QEMU; if true, it is shared
+#         (default: false)
+#
+# @size: size of the memory region in bytes
+#
+# @x-use-canonical-path-for-ramblock-id: if true, the canoncial path is used
+#                                        for ramblock-id. Disable this for 4.0
+#                                        machine types or older to allow
+#                                        migration with newer QEMU versions.
+#                                        This option is considered stable
+#                                        despite the x- prefix. (default:
+#                                        false generally, but true for machine
+#                                        types <= 4.0)
+#
+# Since: 2.1
+##
+{ 'struct': 'MemoryBackendProperties',
+  'data': { '*dump': 'bool',
+            '*host-nodes': ['uint16'],
+            '*merge': 'bool',
+            '*policy': 'HostMemPolicy',
+            '*prealloc': 'bool',
+            '*prealloc-threads': 'uint32',
+            '*share': 'bool',
+            'size': 'size',
+            '*x-use-canonical-path-for-ramblock-id': 'bool' } }
+
+##
+# @MemoryBackendFileProperties:
+#
+# Properties for memory-backend-file objects.
+#
+# @align: the base address alignment when QEMU mmap(2)s @mem-path. Some
+#         backend stores specified by @mem-path require an alignment different
+#         than the default one used by QEMU, e.g. the device DAX /dev/dax0.0
+#         requires 2M alignment rather than 4K. In such cases, users can
+#         specify the required alignment via this option.
+#         0 selects a default alignment (currently the page size). (default: 0)
+#
+# @discard-data: if true, the file contents can be destroyed when QEMU exits,
+#                to avoid unnecessarily flushing data to the backing file. Note
+#                that ``discard-data`` is only an optimization, and QEMU might
+#                not discard file contents if it aborts unexpectedly or is
+#                terminated using SIGKILL. (default: false)
+#
+# @mem-path: the path to either a shared memory or huge page filesystem mount
+#
+# @pmem: specifies whether the backing file specified by @mem-path is in
+#        host persistent memory that can be accessed using the SNIA NVM
+#        programming model (e.g. Intel NVDIMM).
+#
+# @readonly: if true, the backing file is opened read-only; if false, it is
+#            opened read-write. (default: false)
+#
+# Since: 2.1
+##
+{ 'struct': 'MemoryBackendFileProperties',
+  'base': 'MemoryBackendProperties',
+  'data': { '*align': 'size',
+            '*discard-data': 'bool',
+            'mem-path': 'str',
+            '*pmem': { 'type': 'bool', 'if': 'defined(CONFIG_LIBPMEM)' },
+            '*readonly': 'bool' } }
+
+##
+# @MemoryBackendMemfdProperties:
+#
+# Properties for memory-backend-memfd objects.
+#
+# The @share boolean option is true by default with memfd.
+#
+# @hugetlb: if true, the file to be created resides in the hugetlbfs filesystem
+#           (default: false)
+#
+# @hugetlbsize: the hugetlb page size on systems that support multiple hugetlb
+#               page sizes (it must be a power of 2 value supported by the
+#               system). 0 selects a default page size. This option is ignored
+#               if @hugetlb is false. (default: 0)
+#
+# @seal: if true, create a sealed-file, which will block further resizing of
+#        the memory (default: true)
+#
+# Since: 2.12
+##
+{ 'struct': 'MemoryBackendMemfdProperties',
+  'base': 'MemoryBackendProperties',
+  'data': { '*hugetlb': 'bool',
+            '*hugetlbsize': 'size',
+            '*seal': 'bool' } }
+
+##
 # @ObjectType:
 #
 # Since: 6.0
@@ -288,7 +398,11 @@
     { 'name': 'cryptodev-vhost-user',
       'if': 'defined(CONFIG_VIRTIO_CRYPTO) && defined(CONFIG_VHOST_CRYPTO)' },
     'dbus-vmstate',
-    'iothread'
+    'iothread',
+    'memory-backend-file',
+    { 'name': 'memory-backend-memfd',
+      'if': 'defined(CONFIG_LINUX)' },
+    'memory-backend-ram'
   ] }
 
 ##
@@ -316,7 +430,11 @@
       'cryptodev-vhost-user':       { 'type': 'CryptodevVhostUserProperties',
                                       'if': 'defined(CONFIG_VIRTIO_CRYPTO) && defined(CONFIG_VHOST_CRYPTO)' },
       'dbus-vmstate':               'DBusVMStateProperties',
-      'iothread':                   'IothreadProperties'
+      'iothread':                   'IothreadProperties',
+      'memory-backend-file':        'MemoryBackendFileProperties',
+      'memory-backend-memfd':       { 'type': 'MemoryBackendMemfdProperties',
+                                      'if': 'defined(CONFIG_LINUX)' },
+      'memory-backend-ram':         'MemoryBackendProperties'
   } }
 
 ##