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

[Julian Andres Klode]

I could successfully chainload grub from shim by using virtio-net and
disabling iPXE. Minimal reproducer:

sudo kvm -bios /usr/share/OVMF/OVMF_CODE.fd -device virtio-net,netdev=n1
-netdev user,id=n1,tftp=/boot/efi/EFI/ubuntu,bootfile=shimx64.efi
-global virtio-net-pci.romfile=""

if I remove the last option (which disables iPXE), it fails to boot
again.

Building iPXE with CONFIG=qemu seems to be a fairly complicated affair.
The build system is a mess.

** Also affects: ipxe (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ipxe (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1789319

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

Status in MAAS:
  Triaged
Status in grub2 package in Ubuntu:
  Confirmed
Status in ipxe package in Ubuntu:
  Triaged
Status in shim package in Ubuntu:
  Triaged

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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