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From Wido den Hollander <>
Subject Re: Proposal for EFI firmware support on KVM
Date Thu, 14 Mar 2019 14:14:25 GMT

On 3/13/19 3:29 PM, Nathan Johnson wrote:
> I've put together an approach for EFI support that we would like to get some feedback
on before I create a PR.  Constructive criticism would be appreciated.
> I've added the following properties to be configured in the
> guest.loader.efi - boolean to switch efi on.  This must be true before it will inject
any <loader> entries into the domain xml
> guest.loader.image - this would be the path to the bios/efi image
> guest.loader.nvram - this optionally points to an nvram image
> Even when a host is configured so that it can use EFI, it will only actually create a
virtual machine when both of the following conditions are met:
> 1) the host has guest.locader.efi set to true in its

Can't we detect if the host is EFI capable without the need of adding a
new flag to the

It advertises the capability of EFI to the Mgmt server and only then can
efi=true Instances be started on that host.

> 2) the vm has the vm details parameter efi=true
> > At present there is no automatic way for the management server to know
in advance which hosts have EFI enabled.  I suppose this could be
approximated using tags.  It might be nice to make this more automatic,
and have the resource planner aware of the efi toggle on the VM, but I'm
not sure how best to implement that or if it's even worth it.

As others already mentioned. The Agent/Host capabilities should be


> Thanks in advance!
> Nathan Johnson
> Senior R&D Engineer
> Education Networks of America

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