start fuchsia in qemu with a FVM disk

    start fuchsia in qemu with a FVM disk

    usage: fx qemu [-z <zbi_image>] [--uefi <image>] [--archive <tgt>]

         -z <zbi_image>        use <zbi_image> instead of the default (- for none)
         -t <boot_shim>        use <boot_shim> instead of the default
         --uefi <image>        Boot through UEFI and do so with the supplied UEFI filesystem or disk
                               image. Mutually exclusive with '-z' and '-t'.
         --archive <tgt>       Don't actually run QEMU.  Instead, create a compressed tarball archive
                               named "<tgt>.tgz" which contains all of the images needed to run QEMU.
         --no-authorized-keys  Don't patch the ZBI to add ~/.ssh/fuchsia_authorized_keys into the
                               BOOTFS for SSH access (the default behavior).


    When generating an archive, either two or three files are typically included in the
    archive.  They are:

    1) qemu-boot-shim.bin
       This file is the image to be loaded into RAM and jumped to. When using QEMU,
       pass this file to the VM instance using the -kernel option.
    2) fuchsia-ssh.zbi
       This file is the image to be used as the initial ramdisk for the VM. When using QEMU,
       pass this file to the VM instance using the -initrd option.
    3) raw.blk
       This file is the initial raw image of the block device for the VM.  It is
       not present in a "bringup" build configuration, but should be present for
       "core" builds and beyond.  When using QEMU, this file is provided to the
       VM using the --drive option, but needs to be manifested in the machine as
       a device using --device options in order for it to be available for the OS
       to mount.  An example of these flags might looks something like this:

         -drive file=<path_to_fvm_raw.zbi>,format=raw,if=none,id=mydisk
         -device ich9-ahci,id=ahci
         -device ide-hd,drive=mydisk,bus=ahci.0

    This command delegates to //zircon/scripts/run-zircon. Other flags are
    documented in that script, and can be discovered by passing -h or --help.


[qemu source code](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/devshell/qemu)