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Re: [edk2-devel] A problem with live migration of UEFI virtual machines

From: Dr. David Alan Gilbert
Subject: Re: [edk2-devel] A problem with live migration of UEFI virtual machines
Date: Mon, 2 Mar 2020 12:32:19 +0000
User-agent: Mutt/1.13.3 (2020-01-12)

* Laszlo Ersek (address@hidden) wrote:

> The interesting question is, what happens when you power down the VM on
> the destination host (= post migration), and launch it again there, from
> zero. In that case, the firmware executable file comes from the
> *destination host* (it was never persistently migrated from the source
> host, i.e. never written out on the dst). It simply comes from the OVMF
> package that had been installed on the destination host, by the
> sysadmin. However, the varstore pflash does reflect the permanent result
> of the previous migration. So this is where things can fall apart, if
> both firmware binaries (on the src host and on the dst host) don't agree
> about the internal structure of the varstore pflash.

My guess is that overtime we're going to need to find a way to handle
this, otherwise we're going to find people having to maintain old
versions of OVMF just to keep variable store compatiiblity.


> Thanks
> Laszlo
Dr. David Alan Gilbert / address@hidden / Manchester, UK

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