Commits on Aug 2, 2023

1. feat(qemu): include the virtio_mem kernel module …

   This adds support for virtio-mem devices, which provide a dynamic
   amount of memory in a VM. Right now, the driver gets loaded and any
   memory gets added to the system when loading the kernel module from disk.
   
   While not strictly required to boot, we want to be able to
   1) add virito-mem provided memory to the system early while booting up
   2) add virtio-mem provided memory even when booting without a disk
   3) add virtio-mem devices without adding actual memory in kdump
      environments such that we can query things like:
    a) is a certain PFN currently plugged in the hypervisor and, therefore,
       should actually be read when creating a system dump. (kexec-tools
       prepares the vmcore header, like on x86-64)
    b) which ranges of a virtio-mem device are currently plugged in the
       hypervisor and, therefore, should be added to the dump. (vmcore header
       gets prepared by the crashkernel, like on s390x)
    Note that loading virtio-mem in kdump environments currently fails with
    -EBUSY -- but there are plans to install proper hooks instead to support
     especially a) in the near future.
   
   1) and 2) are only really effective when memory hotplug is configured to
   automatically online all added system RAM in the kernel (and not late,
   via udev rules): e.g., via "mhp_default_state=online" on the kernel
   cmdline or via CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE in the kernel.
   
   Especially 2) and 3) require the module to be present inside the initial
   ramdisk. The primary use case for including it in the initial ramdisk
   is 3).
   
   Signed-off-by: David Hildenbrand <[email protected]>
   (cherry picked from commit f3dcb60)
   
   Cherry-picked from: f3dcb60
   Resolves: #2228422

   

   davidhildenbrand authored and lnykryn committed Aug 2, 2023
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