Merge tag 'mem-2023-07-12' of https://github.com/davidhildenbrand/qemu into staging

Hi,

"Host Memory Backends" and "Memory devices" queue ("mem"):
- Memory device cleanups (especially around machine initialization)
- "x-ignore-shared" migration support for virtio-mem
- Add an abstract virtio-md-pci device as a common parent for
  virtio-mem-pci and virtio-pmem-pci (virtio based memory devices)
- Device unplug support for virtio-mem-pci

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# gpg: Good signature from "David Hildenbrand <david@redhat.com>" [unknown]
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# gpg:                 aka "David Hildenbrand <hildenbr@in.tum.de>" [unknown]
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# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 1BD9 CAAD 735C 4C3A 460D  FCCA 4DDE 10F7 00FF 835A

* tag 'mem-2023-07-12' of https://github.com/davidhildenbrand/qemu

: (21 commits)
  virtio-mem-pci: Device unplug support
  virtio-mem: Prepare for device unplug support
  virtio-md-pci: Support unplug requests for compatible devices
  virtio-md-pci: Handle unplug of virtio based memory devices
  arm/virt: Use virtio-md-pci (un)plug functions
  pc: Factor out (un)plug handling of virtio-md-pci devices
  virtio-md-pci: New parent type for virtio-mem-pci and virtio-pmem-pci
  virtio-mem: Support "x-ignore-shared" migration
  migration/ram: Expose ramblock_is_ignored() as migrate_ram_is_ignored()
  virtio-mem: Skip most of virtio_mem_unplug_all() without plugged memory
  softmmu/physmem: Warn with ram_block_discard_range() on MAP_PRIVATE file mapping
  memory-device: Track used region size in DeviceMemoryState
  memory-device: Refactor memory_device_pre_plug()
  hw/i386/pc: Remove PC_MACHINE_DEVMEM_REGION_SIZE
  hw/i386/acpi-build: Rely on machine->device_memory when building SRAT
  hw/i386/pc: Use machine_memory_devices_init()
  hw/loongarch/virt: Use machine_memory_devices_init()
  hw/ppc/spapr: Use machine_memory_devices_init()
  hw/arm/virt: Use machine_memory_devices_init()
  memory-device: Introduce machine_memory_devices_init()
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>