qemu/include
Igor Mammedov 17cc0128da qdev: Let machine hotplug handler to override bus hotplug handler
it will allow to return another hotplug handler than the default
one for a specific bus based device type. Which is needed to handle
non trivial plug/unplug sequences that need the access to resources
configured outside of bus where device is attached.

That will allow for returned hotplug handler to orchestrate wiring
in arbitrary order, by chaining other hotplug handlers when
it's needed.

PS:
It could be used for hybrid virtio-mem and virtio-pmem devices
where it will return machine as hotplug handler which will do
necessary wiring at machine level and then pass control down
the chain to bus specific hotplug handler.

Example of top level hotplug handler override and custom plug sequence:

  some_machine_get_hotplug_handler(machine){
      if (object_dynamic_cast(OBJECT(dev), TYPE_SOME_BUS_DEVICE)) {
          return HOTPLUG_HANDLER(machine);
      }
      return NULL;
  }

  some_machine_device_plug(hotplug_dev, dev) {
      if (object_dynamic_cast(OBJECT(dev), TYPE_SOME_BUS_DEVICE)) {
          /* do machine specific initialization */
          some_machine_init_special_device(dev)

          /* pass control to bus specific handler */
          hotplug_handler_plug(dev->parent_bus->hotplug_handler, dev)
      }
  }

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190228122849.4296-3-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-03-06 11:51:08 -03:00
..
authz authz: add QAuthZPAM object type for authorizing using PAM 2019-02-26 15:32:19 +00:00
block block: Purify .bdrv_refresh_filename() 2019-02-25 15:11:27 +01:00
chardev char: move SpiceChardev and open_spice_port() to spice.h header 2019-02-21 14:09:17 +01:00
crypto Don't talk about the LGPL if the file is licensed under the GPL 2019-01-30 10:51:20 +01:00
disas target/mips: Add disassembler support for nanoMIPS 2018-10-25 22:13:33 +02:00
exec pci, pc, virtio: fixes, cleanups, tests 2019-03-04 11:04:31 +00:00
fpu softfloat: Implement float128_to_uint32 2019-02-26 14:05:19 +00:00
hw qdev: Let machine hotplug handler to override bus hotplug handler 2019-03-06 11:51:08 -03:00
io io: Make qio_channel_yield() interruptible 2019-02-25 15:03:19 +01:00
libdecnumber
migration migration: Switch to using announce timer 2019-03-05 11:27:41 +08:00
monitor monitor: Remove "x-oob", offer capability "oob" unconditionally 2018-12-12 10:28:27 +01:00
net net: Add a network device specific self-announcement ability 2019-03-05 11:27:41 +08:00
qapi qapi: remove qmp_unregister_command() 2019-02-18 14:44:05 +01:00
qemu bswap: Fix accessors syntax in comment 2019-03-06 10:45:06 +01:00
qom arm: Clarify the logic of set_pc() 2019-02-01 14:55:46 +00:00
scsi avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
standard-headers * cpu-exec fixes (Emilio, Laurent) 2019-02-05 19:39:22 +00:00
sysemu migration: Switch to using announce timer 2019-03-05 11:27:41 +08:00
ui spice: set device address and device display ID in QXL interface 2019-02-21 10:15:26 +01:00
elf.h pvh: Boot uncompressed kernel using direct boot ABI 2019-02-05 16:50:16 +01:00
glib-compat.h slirp: Move g_spawn_async_with_fds_qemu compatibility to slirp/ 2019-02-07 15:49:08 +02:00
qemu-common.h qemu-common.h: Update copyright string for 2019 2019-02-06 15:45:23 +01:00
qemu-io.h qemu-io: Let command functions return error code 2018-06-11 16:18:45 +02:00
trace-tcg.h