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[Launchpad Bug Tracker <1519836@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package grub2 - 2.02~beta2-36ubuntu3.6

---------------
grub2 (2.02~beta2-36ubuntu3.6) xenial; urgency=medium

  * Fix support for IPv6 PXE booting under UEFI: (LP: #1229458)
    - grub_add_grub_env_set_net_property.patch: add grub_env_set_net_property.
    - misc-fix-invalid-char-strtol.patch: fix strto*l methods invalid chars.
    - net_read_bracketed_ipv6_addr.patch: read bracketed IPv6 addresses.
    - bootp_new_net_bootp6_command.patch: add new bootp6 commands.
    - efinet_uefi_ipv6_pxe_support.patch: teach efinet to allow bootp6.
    - bootp_process_dhcpack_http_boot.patch: process DHCPACK, support HTTP.
    - efinet_set_network_from_uefi_devpath.patch: configure network from the
      devpath provided by the UEFI firmware.
    - efinet_set_dns_from_uefi_proto.patch: set DNS nameservers and search
      domains from the UEFI protocol.
  * Fix booting on Hyper-V gen 2 VMs due to the lack of PIT there; we can deal
    with this by using other timers when PIT aren't available. (LP: #1519836)
    - debian/patches/git_tsc_use_alt_delay_sources_d43a5ee6.patch
    - debian/patches/git_split_pmtimer_wait_tsc_d9a3bfea.patch
    - debian/patches/git_fix_tsc_calibration_pit_a03c1034.patch

grub2 (2.02~beta2-36ubuntu3.3) xenial; urgency=medium

  * debian/patches/ip6_send_router_solicitation_7c4b6b7b.patch: handle long
    RA intervals by explicitly sending a SOLICIT.
  * debian/patches/ip6_fix_routing_eb9f401f.patch: fix IPv6 routing; we should
    be able to talk to things outside of link-local addresses; to do this,
    allow specifying a gateway and interface. (LP: #1229458)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Thu, 15 Sep 2016
13:56:55 -0400

** Changed in: grub2 (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1519836

Title:
  MaaS fails to boot Hyper-V Generation 2 virtual machines

Status in MAAS:
  Invalid
Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Released
Status in grub2-signed source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  When trying to deploy a "Generation 2" virtual machine on Hyper-V, grub fails to fetch the linux kernel and initrd from MaaS. The operation times out immediately, because the Generation 2 VMs are missing the Programmable Interval Timer (PIT). The current version of grub still requires this interface to exist, in order to calculate time.

  [Test case]
  Attempt to boot a Generation 2 Hyper-V system from MAAS.

  [Regression potential]
  Since this changes the way timers are picked and used in grub, this may cause things depending on timers (timeout for various features, timeout for the GRUB menu, waiting for keyboard input to get in the menu) may be affected. Any wrong behavior in keyboard input validation for getting into the grub menu on boot should be considered a regression on this patch.

  ---

  There is a patch that uses the EFI SetTimer() available here:

  http://savannah.gnu.org/bugs/?42944

  and an alternative in the discussion here:

  https://lists.gnu.org/archive/html/grub-devel/2014-10/msg00016.html

  that uses pmtimer instead. I am aware that grub is a critical package.
  What is the official/proper way to fix this issue? Can a patched
  grubnetx64.efi be packaged with MaaS? Do we have to wait for this fix
  to merge?

  Gabriel

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