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We are about to add 6 new values to fetch. This will put us over the current limit of 16 (we're at 13 now). Once there are more than 16 parameters, this will affect existing clients that attempt to fetch blockiotune config values for the domain from the remote host since the server side has no mechanism to determine whether the capability for the emulator exists and thus would attempt to return all known values from the persistentDef. If attempting to fetch the blockiotune values from a running domain, the code will check the emulator capabilities and set maxparams (in qemuDomainGetBlockIoTune) appropriately. On the client side of the remote connection, it uses this constant in xdr_remote_domain_get_block_io_tune_ret and virTypedParamsDeserialize calls, so if a remote server returns more than 16 parameters, then the client will fail with "Unable to decode message payload". Signed-off-by: John Ferlan <jferlan@redhat.com>
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>