diff options
Diffstat (limited to 'qapi/qom.json')
| -rw-r--r-- | qapi/qom.json | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/qapi/qom.json b/qapi/qom.json index fa3e88c8e6..c53ef978ff 100644 --- a/qapi/qom.json +++ b/qapi/qom.json @@ -668,6 +668,20 @@ # @readonly: if true, the backing file is opened read-only; if false, # it is opened read-write. (default: false) # +# @rom: whether to create Read Only Memory (ROM) that cannot be modified +# by the VM. Any write attempts to such ROM will be denied. Most +# use cases want writable RAM instead of ROM. However, selected use +# cases, like R/O NVDIMMs, can benefit from ROM. If set to 'on', +# create ROM; if set to 'off', create writable RAM; if set to +# 'auto', the value of the @readonly property is used. This +# property is primarily helpful when we want to have proper RAM in +# configurations that would traditionally create ROM before this +# property was introduced: VM templating, where we want to open a +# file readonly (@readonly set to true) and mark the memory to be +# private for QEMU (@share set to false). For this use case, we need +# writable RAM instead of ROM, and want to set this property to 'off'. +# (default: auto, since 8.2) +# # Since: 2.1 ## { 'struct': 'MemoryBackendFileProperties', @@ -677,7 +691,8 @@ '*discard-data': 'bool', 'mem-path': 'str', '*pmem': { 'type': 'bool', 'if': 'CONFIG_LIBPMEM' }, - '*readonly': 'bool' } } + '*readonly': 'bool', + '*rom': 'OnOffAuto' } } ## # @MemoryBackendMemfdProperties: |