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There is no need to deny writes on a readonly mount: write still won't be accepted, even if the user remounts the folder as RW in the guest as qemu sets the 9p mount as ro. This deny rule was leading to problems for example with readonly /: The qemu process had to write to a bunch of files in / like logs, sockets, etc. This deny rule was also preventing auditing of these denials, making it harder to debug.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>