Agreed with the initial analysis, there's nothing in device assignment to limit to 32 devices except where downstream distros have intentionally added a limit for support purposes. The issue here is that the host hit a PCIe Downstream Port Containment uncorrectable error, apparently causing at least a sub-hierarchy of the PCIe topology to go offline. This is potentially more likely a hardware issue than a software issue. It may be possible to mask the issue by unbinding the interconnect devices in the affected sub-hierarchy from the dpc driver. It might also be interesting to test with a subset of devices to understand if there are specific devices triggering spurious DPC errors, it may only be a sub-set or single device triggering spurious errors, or perhaps it's the succession of bus resets for GPU assignment that trigger such a fault. The system firmware logs may provide additional information regarding the source(s) of the fault.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771238 Title: Not able to passthrough > 32 PCIe devices to a KVM Guest To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1771238/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
