vfio/pci: Handle host oversight
In case the end-user calls qemu with -vfio-pci option without passing either sysfsdev or host property value, the device is interpreted as 0000:00:00.0. Let's create a specific error message to guide the end-user. Signed-off-by: NEric Auger <eric.auger@redhat.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
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