[Bug 1789319] Re: Unable to load shimx64.efi using iPXE over UEFI

[Steve Langasek]

I don't understand what iPXE has to do with anything here.  If you are
running a virtual machine in UEFI mode, you have a full UEFI firmware
implementation which directly supports dhcp netboot without any
involvement of iPXE.  And I am unaware of any issues with netbooting
ovmf to shim->grub->grub.efi.

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Title:
  Unable to load shimx64.efi using iPXE over UEFI

Status in MAAS:
  Triaged
Status in ipxe package in Ubuntu:
  New
Status in shim-signed package in Ubuntu:
  New

Bug description:
  libvirt supports creating virtual machines running in UEFI mode and
  uses iPXE to enable network booting. When MAAS gives shimx64.efi, as
  it does on all UEFI systems, to iPXE it chainloads grub but fails to
  the grub prompt. If I modify MAAS to give grubx64.efi instead of
  shimx64.efi UEFI booting works.

  Ideally iPXE would be modified to properly chainload the shim however
  MAAS could also check the user-agent when returning the boot file as
  follows.

  if option arch = 00:00 {
      # pxe
      filename "lpxelinux.0";
  } elsif option arch = 00:07 and exists user-class and option user-class = "iPXE" {
      # iPXE uefi_amd64
      filename "grubx64.efi";
  } elsif option arch = 00:07 {
      # uefi_amd64
      filename "bootx64.efi";
  } elsif option arch = 00:09 and exists user-class and option user-class = "iPXE" {
      # iPXE uefi_amd64
      filename "grubx64.efi";
  } elsif option arch = 00:09 {
      # uefi_amd64
      filename "bootx64.efi";
  } elsif option arch = 00:0B {
      # uefi_arm64
      filename "grubaa64.efi";
  } elsif option arch = 00:0C {
      # open-firmware_ppc64el
      filename "bootppc64.bin";
  } elsif option arch = 00:0E {
      # powernv
      filename "pxelinux.0";
      option path-prefix "ppc64el/";
  } elsif option arch = 00:1F {
      # s390x
      filename "boots390x.bin";
      option path-prefix "s390x/";
  } else {
      # pxe
      filename "lpxelinux.0";
  }

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