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ef29de14c3
The previous patches added infrastructure to report better errors from monitor in some cases. This patch finalizes this "feature" by enabling this enhanced error reporting on early phases of VM startup. In these phases the possibility of qemu producing a useful error message is really high compared to running it during the whole life cycle. After the start up is complete, the feature is disabled to provide the usual error messages so that users are not confused by possibly irrelevant messages that may be in the domain log. The original motivation to do this enhancement is to capture errors when using VFIO device passthrough, where qemu reports errors after the monitor is initialized and the existing error catching code couldn't catch this producing a unhelpful message: # virsh start test error: Failed to start domain test error: Unable to read from monitor: Connection reset by peer With this change, the message is changed to: # virsh start test error: Failed to start domain test error: internal error: early end of file from monitor: possible problem: qemu-system-x86_64: -device vfio-pci,host=00:1a.0,id=hostdev0,bus=pci.0,addr=0x5: vfio: error, group 8 is not viable, please ensure all devices within the iommu_group are bound to their vfio bus driver. qemu-system-x86_64: -device vfio-pci,host=00:1a.0,id=hostdev0,bus=pci.0,addr=0x5: vfio: failed to get group 8 qemu-system-x86_64: -device vfio-pci,host=00:1a.0,id=hostdev0,bus=pci.0,addr=0x5: Device 'vfio-pci' could not be initialized
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>