Martin Kletzander 2d04f6de77 qemu: Limit maximum block device I/O tune values
The values are currently limited to LLONG_MAX which causes some
problems.  QEMU conveniently changed their maximum to 1e15 (1 PB) which
is enough for some time and we need to adapt to that so that we don't
throw "Unknown error" messages.  Strictly limiting these values actually
fixes some corner case values (off-by-one checks in QEMU probably).

Since values out of the new specified range do not overflow anything,
change the type of error as well.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1317531

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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         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>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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