[Bug 1519836] Re: MaaS fails to boot Hyper-V Generation 2 virtual machines

Chris Valean cvalean at cloudbasesolutions.com
Mon May 16 10:30:28 UTC 2016

We've built beta2 from sources around the #6-#8 comments, as the idea was that commit a03c1034 - and now d43a5ee65143f384357fbfdcace4258e3537c214 are part of beta3.
However, if the current supported releases won't get a grub update to beta3, they would still fail.

I can verify beta3, and can you please check on what is the plan to
handle the version of grub delivered?

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  MaaS fails to boot Hyper-V Generation 2 virtual machines

Status in MAAS:
Status in grub2 package in Ubuntu:
  In Progress

Bug description:
  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

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


  and an alternative in the discussion here:


  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?


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