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If libvirtd is running unprivileged, it can open a device's PCI config data in sysfs, but can only read the first 64 bytes. But as part of determining whether a device is Express or legacy PCI, qemuDomainDeviceCalculatePCIConnectFlags() will be updated in a future patch to call virPCIDeviceIsPCIExpress(), which tries to read beyond the first 64 bytes of the PCI config data and fails with an error log if the read is unsuccessful. In order to avoid creating a parallel "quiet" version of virPCIDeviceIsPCIExpress(), this patch passes a virQEMUDriverPtr down through all the call chains that initialize the qemuDomainFillDevicePCIConnectFlagsIterData, and saves the driver pointer with the rest of the iterdata so that it can be used by qemuDomainDeviceCalculatePCIConnectFlags(). This pointer isn't used yet, but will be used in an upcoming patch (that detects Express vs legacy PCI for VFIO assigned devices) to examine driver->privileged.
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>