On Thu, Dec 20, 2018 at 03:15:34PM +0100, Riccardo Ravaioli wrote: > Hi, > > My goal is to assign PCI addresses to a number of devices (network > interfaces, disks and PCI devices in PCI-passthrough) without delegating to > libvirt the generation of those values. This should give me more control > and for sure more predictability over the hardware configuration of a > virtual machine and consequently the name of the interfaces in it. I'm > using libvirt 4.3.0 to create qemu/KVM virtual machines running Linux > (Debian Stretch). > > So, for every device of the type mentioned above, I add this line: > <address type='pci' domain='0x0000' bus='0x__' slot='0x__' function='0x0'/>, > ... with values from 00 to ff in the bus field, and from 00 to 1f in the > slot field, as described in the documentation. > > Long story short, I noticed that as soon as I assign values > 0x09 to the > bus field, the serial console hangs indefinitely, in both Debian and > Ubuntu. The VM seems to be started correctly and its state is "running"; in > the XML file created by libvirt, I see all controllers from 0 the largest > bus value I assigned, so everything from that side seems ok.
I guess the hang is that you hit some limit in PCI buses. The real question though is why you need to create sooooo many PCI buses. Each bus can do 31 devices. Do you really need to have more than 279 devices in your VM ? Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| _______________________________________________ libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users
