pc: create custom generic PC machine type

it will be used for PC specific options/variables

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
pc: ACPI BIOS: use enum for defining memory affinity flags

replace magic numbers with enum describing Flags field of
memory affinity in SRAT table.

MemoryAffinityFlags enum will define flags decribed by:
 ACPI spec 5.0, "5.2.16.2 Memory Affinity Structure",
 "Table 5-69 Flags - Memory Affinity Structure"

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
object_add: allow completion handler to get canonical path

Add object to /objects before calling user_creatable_complete()
handler, so that object might be able to call
object_get_canonical_path() in its completion handler.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
vl.c: daemonize before guest memory allocation

memory allocated for guest before QEMU is daemonized and then mapped
later in guest's address space after it is daemonized, leads to EPT
violation and QEMU aborts.

To avoid this and similar issues switch to daemonized mode early
before applying/processing other options.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
---
I haven't digged in kvm itself yet why EPT violation happens,
but fix on QEMU side looks trivial so it won't hurt to use it anyway.

there is simpler reporoducer without migration, start guest with
 '-object memory-ram,id=foo,size=1G'
when guest is up and running hotplug dimm device using 'foo' memdev
as backend.
add memdev backend infrastructure

Provides framework for splitting host RAM allocation/
policies into a separate backend that could be used
by devices.

Initially only legacy RAM backend is provided, which
uses memory_region_init_ram() allocator and compatible
with every CLI option that affects memory_region_init_ram().

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
v5:
 - drop default 'complete' method, allowing child not to implement it
 - codestyle cleanups
v4:
 - don't use nonexisting anymore error_is_set()
v3:
 - fix path leak & use object_get_canonical_path_component()
   for getting object name
v2:
 - reuse UserCreatable interface instead of custom callbacks
vl.c: extend -m option to support options for memory hotplug

Add following parameters:
  "slots" - total number of hotplug memory slots
  "maxmem" - maximum possible memory

"slots" and "maxmem" should go in pair and "maxmem" should be greater
than "mem" for memory hotplug to be enabled.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v4:
 - store maxmem & slots values in MachineState
v3:
 - store maxmem & slots values in QEMUMachineInitArgs
v2:
 - rebased on top of the latest "vl: convert -m to QemuOpts"
qdev: hotplug for buss-less devices

Adds get_hotplug_handler() method to machine, and
makes bus-less device to use it during hotplug
as a means to discover hotplug handler controller.
Returned controller is used to permorm a hotplug
action.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
qdev: expose DeviceState.hotplugged field as a property

so that management could detect via QOM interface if device was
hotplugged

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
---
v2:
 - fix typo in commit message (afaerber)
pc: implement pc-dimm device abstraction

Each hotplug-able memory slot is a PCDIMMDevice.
A hot-add operation for a memory device:
- creates a new PCDIMMDevice and makes hotplug controller to map it into
  guest address space

Hotplug operations are done through normal device_add commands.
For migration case, all hotplugged memory devices on source should be
specified on target's command line using '-device' option with
properties set to the same values as on source.

To simplify review, patch introduces only PCDIMMDevice QOM skeleton that
will be extended by following patches to implement actual memory hotplug
and related functions.

Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v5:
  rename DimmDevice to PCDIMMDevice
v4:
  drop DimmBus in favor of bus-less device hotplug
  rename property/field 'start' to 'addr'
  use defines for property names
v3:
  pc: compile memhotplug on i386 target too
v2:
  fix typo s/DimmBus/DimmDevice/ in doc comment
  s/klass/oc/;s/*/parent_obj/;a/gtk-doc markup/
memory: add memory_region_is_mapped() API

which allows to check if MemoryRegion is already mapped.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v2:
  simplify check, just by checking if MR has parent
pc-dimm: do not allow to set already used memdev

using the same memdev backend more than once will cause
assersion at MemoryRegion mapping time becase it's already
mapped. Prevent it by checking that associated MemoryRegion
is not mapped.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
pc: initialize memory hotplug address space

initialize and map hotplug memory address space container
into guest's RAM address space.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
---
v2:
  * fix uint64_t overflow reported by Hu Tao
  * rebase on top of Marcel's patch
      "machine: Conversion of QEMUMachineInitArgs to MachineState"
pc: exit QEMU if number of slots more than supported 256

... which is imposed by current naming scheme of ACPI memory devices.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
---
v2:
 * use define for amount of supported slots, requested by Eduardo Habkost
pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS

'etc/reserved-memory-end' will allow QEMU to tell BIOS where PCI
BARs mapping could safely start in high memory.

Allowing BIOS to start mapping 64-bit PCI BARs at address where it
wouldn't conflict with other mappings QEMU might place before it.

That permits QEMU to reserve extra address space before
64-bit PCI hole for memory hotplug.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
---
Seabios part is already commited: 0f474d07d
pc: exit QEMU if compat machine doesn't support memory hotlpug

... if user attempts to start it with memory hotplug enabled.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
pc: add memory hotplug handler to PC_MACHINE

that will perform mapping of PC_DIMM device into guest's RAM address space

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
pc-dimm: add busy address check and address auto-allocation

- if 'addr' property is not specified on -device/device_add command,
treat default value as request for assigning PCDIMMDevice to
the first free memory region.

- if 'addr' is provided with -device/device_add command, attempt to
use it or fail command if it's already occupied or falls inside
of an existing PCDIMMDevice memory region.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
---
v2:
  * abort if hotplug address-space size is too big,
        reported by Hu Tao
  * do not reset previous error in dimm_get_free_addr(),
        fixed by Tang Chen
pc-dimm: add busy slot check and slot auto-allocation

- if slot property is not specified on -device/device_add command,
treat default value as request for assigning PCDIMMDevice to
the first free slot.

- if slot is provided with -device/device_add command, attempt to
use it or fail command if it's already occupied.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
acpi: rename cpu_hotplug_defs.h to pc-hotplug.h

to make it more generic, so it could be used for memory hotplug
as well.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crostwaite@xilinx.com>
---
v2:
 - s/acpi_defs.h/pc-hotplug.h/, requested by mst
acpi: memory hotplug ACPI hardware implementation

- implements QEMU hardware part of memory hotplug protocol
  described at "docs/specs/acpi_mem_hotplug.txt"
- handles only memory add notification event for now

Signed-off-by: Igor Mammedov <imammedo@redhat.com>