[libvirt] [PATCH 0/2] qemu: Add support for host-model pseries machine option

[Daniel P. Berrangé]

On Tue, Oct 08, 2019 at 01:46:55PM -0300, Fabiano Rosas wrote:
> This series adds support for the -machine,host-model= QEMU option for
> for pseries guests.
> 
> Pseries guests used to have a node (/proc/device-tree/host-model) in
> device-tree that exposed the host's model string so that guest
> userspace tools could determine the host machine they were running on.
> 
> QEMU used to provide the node by default, but this has been disabled
> due to security concerns. There is now a machine option (host-model)
> that allows the user to set an arbitrary string to be used as the host
> model.
> 
> Userspace tools will then be broken unless the user explicitly edits
> the domain XML with the desired host model to be exposed to the
> guest. However, having an arbitrary string in the domain XML that
> needs to be the same for every guest in that machine but different
> across host machines would generate issues with XML portability and
> more importantly, migration.

What userspace tool is broken, and in what way ?

Re-introducing the host passthrough to satisfy a broken tool is not
very attractive because it reintroduces the security flaw that the
QEMU change was fixing.

Regards,
Daniel
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