[PATCH v3 1/3] qapi/qdev.json: add DEVICE_UNPLUG_ERROR QAPI event

[Daniel Henrique Barboza <danielhb413@gmail.com>]

At this moment we only provide one event to report a hotunplug error,
MEM_UNPLUG_ERROR. As of Linux kernel 5.12 and QEMU 6.0.0, the pseries
machine is now able to report unplug errors for other device types, such
	as CPUs.

	Instead of creating a (device_type)_UNPLUG_ERROR for each new device,
	create a generic DEVICE_UNPLUG_ERROR event that can be used by all
	unplug errors in the future.

	With this new generic event, MEM_UNPLUG_ERROR is now marked as deprecated.

	Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
	---
	 docs/system/deprecated.rst | 10 ++++++++++
	 qapi/machine.json          |  6 +++++-
	 qapi/qdev.json             | 27 ++++++++++++++++++++++++++-
	 3 files changed, 41 insertions(+), 2 deletions(-)

	diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
	index e2e0090878..c8200d99d4 100644
	--- a/docs/system/deprecated.rst
	+++ b/docs/system/deprecated.rst
	@@ -192,6 +192,16 @@ The ``I7200`` guest CPU relies on the nanoMIPS ISA, which is deprecated
	 (the ISA has never been upstreamed to a compiler toolchain). Therefore
	 this CPU is also deprecated.
	 
	+
	+QEMU API (QAPI) events
	+----------------------
	+
	+``MEM_UNPLUG_ERROR`` (since 6.1)
	+''''''''''''''''''''''''''''''''''''''''''''''''''''''''
	+
	+Use the more generic event ``DEVICE_UNPLUG_ERROR`` instead.
	+
	+
	 System emulator machines
	 ------------------------
	 
	diff --git a/qapi/machine.json b/qapi/machine.json
	index e4d0f9b24f..91dc520734 100644
	--- a/qapi/machine.json
	+++ b/qapi/machine.json
	@@ -1271,6 +1271,9 @@
	 #
	 # @msg: Informative message
	 #
	+# Features:
	+# @deprecated: This event is deprecated. Use @DEVICE_UNPLUG_ERROR instead.
	+#
	 # Since: 2.4
	 #
	 # Example:
	@@ -1283,4 +1286,5 @@
	 #
	 ##
	 { 'event': 'MEM_UNPLUG_ERROR',
	-  'data': { 'device': 'str', 'msg': 'str' } }
	+  'data': { 'device': 'str', 'msg': 'str' },
	+  'features': ['deprecated'] }
	diff --git a/qapi/qdev.json b/qapi/qdev.json
	index b83178220b..349d7439fa 100644
	--- a/qapi/qdev.json
	+++ b/qapi/qdev.json
	@@ -84,7 +84,9 @@
	 #        This command merely requests that the guest begin the hot removal
	 #        process.  Completion of the device removal process is signaled with a
	 #        DEVICE_DELETED event. Guest reset will automatically complete removal
	-#        for all devices.
	+#        for all devices. If an error in the hot removal process is detected,
	+#        the device will not be removed and a DEVICE_UNPLUG_ERROR event is
	+#        sent.
	 #
	 # Since: 0.14
	 #
	@@ -124,3 +126,26 @@
	 ##
	 { 'event': 'DEVICE_DELETED',
	   'data': { '*device': 'str', 'path': 'str' } }
	+
	+##
	+# @DEVICE_UNPLUG_ERROR:
	+#
	+# Emitted when a device hot unplug error occurs.
	+#
	+# @device: device name
	+#
	+# @msg: Informative message
	+#
	+# Since: 6.1
	+#
	+# Example:
	+#
	+# <- { "event": "DEVICE_UNPLUG_ERROR"
	+#      "data": { "device": "dimm1",
	+#                "msg": "Memory hotunplug rejected by the guest for device dimm1"
	+#      },
	+#      "timestamp": { "seconds": 1615570772, "microseconds": 202844 } }
	+#
	+##
	+{ 'event': 'DEVICE_UNPLUG_ERROR',
	+  'data': { 'device': 'str', 'msg': 'str' } }
	-- 
	2.31.1