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Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation
Date: Wed, 13 Apr 2016 14:00:39 +0300

On Wed, Apr 13, 2016 at 10:59:35AM +0200, Markus Armbruster wrote:
> I have a hard time coming up with realistic unclean breakage.

The issue is that Linux is now exposing fw cfg to userspace.
So it's use is about to expand significantly.

This is what I am trying to prevent:
- in 2016, users build a guest using a path XXX outside opt.
  there's a warning on host, but it is not noticed.
- in 2020, qemu starts using path XXX for internal purposes.
- using guest from 2016 now breaks uncleanly on this new qemu
  since guest thinks it's talking to the external tool.


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